Packet handler of audio data by isochronous mode

A packet receiving apparatus having a plurality of receiving buffers to receive packets from a plurality of transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• a timestamp output section that selects a predetermined one of packets which are received sequentially for retrieving a timestamp contained in the predetermined packet;
• a reproduction timing clock generating section that generates a reproduction timing clock used for synchronously reproducing the event sequence data contained in the sequentially received packets;
• a comparing section that compares a time indicated by the timestamp retrieved from the predetermined packet with a current time indicated by an internal cycle timer so as to phase-lock the reproduction timing clock to the time of the timestamp;
• and
• a data output section that reproduces the event sequence data contained in the sequentially received packets in synchronization to the reproduction timing clock.

A packet receiving apparatus having a plurality of data buffers to receive packets from a plurality of transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• a pair of first and second timestamp buffers;
• an unpacketizing section that extracts event sequence data and timestamps from received packets;
• a writing section that distributes the extracted event sequence data to the plurality of the data buffers for writing the event sequence data into the data buffers, the writing section further writing a timestamp extracted from a particular packet into the first timestamp buffer and writing other timestamp extracted from other packet than the particular packet into the second timestamp buffer;
• and
• a reading section that reads out the event sequence data from the data buffers in accordance with the timestamps written in the first timestamp buffer and the second timestamp buffer.

A packet receiving apparatus provided on a receiving node for receiving packets from a plurality of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• a timestamp output section that retrieves a timestamp contained in a packet received from a transmitting node;
• a data output section that reproduces event sequence data contained in the same packet received from the transmitting node;
• an offset setting section that sets an offset time for the receiving node relative to the transmitting node and adds the offset time to a time indicated by the timestamp retrieved by the timestamp output section;
• and
• a reproduction time control section that operates when the time of the timestamp added with the offset time coincides with a current time indicated by an internal cycle timer for controlling the data output section to effect synchronous reproduction of the event sequence data contained in the same packet as the timestamp.

A packet receiving apparatus for receiving a packet from a transmitting node located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• a reproduction timing clock generating section generates a reproduction timing clock used for synchronous reproduction of the event sequence data contained in the packet based on the timestamp contained in the packet;
• an output terminal provided for outputting the generated reproduction timing clock externally;
• an input terminal provided for inputting an external reproduction timing clock;
• a data output section that reproduces event sequence data contained in the packet received from the transmitting node in synchronization to either of the generated reproduction timing clock and the external reproduction timing clock;
• and
• a reproduction timing clock setting section that operates in a first mode for feeding the reproduction timing clock generated by the reproduction timing clock generating section to the data output section and to the output terminal, and that operates in a second mode for feeding the external reproduction timing clock inputted from the input terminal to the data output section.

A packet receiving apparatus comprising a plurality of packet handlers including a master packet handler and a slave packet hander for cooperatively receiving packets from transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein each packet handler comprises:

• an unpacketizing section that extracts the event sequence data and the timestamp from the packet;
• a receiving buffer that is provided for temporarily storing the event sequence data;
• a writing section that writes the extracted event sequence data into the receiving buffer;
• and
• a reading section that reads out the event sequence data from the receiving buffer in synchronization to a reproduction timing clock to reproduce the event sequence data,
• wherein the master packet handler generates the reproduction timing clock in accordance with the extracted timestamp and provides the generated reproduction timing clock to the slave packet handler, and
• wherein the master packet handler operates when the receiving buffer has no space to store the event sequence data for allocating the event sequence data to receiving buffer of the slave packet handler.

A packet transmitting apparatus for transmitting packets to receiving nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the packet transmitting apparatus comprising:

• a packetizing section that arranges the event sequence data into data blocks and adds thereto a timestamp so as to sequentially produce packets;
• a transmitting section that sequentially transmits the packets;
• and
• an error processing section that operates when an error is detected during production of the packets for stopping transmission of a regular packet containing event sequence data and for generating and transmitting a special packet containing a message indicative of occurrence of the error.

A packet receiving apparatus having a receiving buffer to receive packets from transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• an unpacketizing section that extracts the event sequence data and the timestamp from the packet;
• a writing section that writes the extracted event sequence data into the receiving buffer;
• a reading section that reproduces the event sequence data from the receiving buffer in synchronization to the extracted timestamp;
• and
• an error processing section that operates when detecting occurrence of a timing error based on the extracted timestamp and other error in either of the writing section and the reading section for muting synchronous reproduction of the event sequence data.

A packet transmitting apparatus for transmitting packets to receiving nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the packet transmitting apparatus comprising:

• an input section that sequentially inputs event sequence data from an external data source in response to an input clock signal having a leading edge and a trailing edge arranged at a predetermined period;
• a fast packetizing section that generates a packet of the inputted event sequence data in response to the leading edge of the input clock signal and generates another packet in response to the trailing edge subsequent to the leading edge, thereby successively generating packets at a rate twice as fast as the input clock signal, and that adds the timestamp every time the predetermined number of data blocks are packetized;
• and
• a transmitting section that sequentially transmits the packets generated by the fast packetizing section.

A packet receiving apparatus for receiving packets from transmitting nodes located on a network to reproduce event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the packet receiving apparatus comprising:

• a receiving section that sequentially receives packets transmitted from one or more of the transmitting node;
• a fast unpacketizing section that operates in response to a reproduction clock signal having a leading edge and a trailing edge arranged at a predetermined period for retrieving event sequence data from a packet at the leading edge of the reproduction clock signal and for retrieving event sequence data from a next packet at the trailing edge subsequent to the leading edge, thereby successively unpacketizing the packets at a rate twice as fast as the reproduction clock signal;
• and
• a data output section that reproduces the event sequence data in response to the reproduction clock signal which is synchronized to the timestamps contained in the received packets.

A packet receiving apparatus for receiving packets from one or more of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• a timestamp output section that retrieves a timestamp from a packet which is received from one of the transmitting nodes;
• a reproduction timing clock generating section that generates a reproduction timing clock used for synchronously reproducing the event sequence data contained in the received packet;
• a comparing section that compares a time indicated by the timestamp retrieved by the timestamp output section with a current time indicated by an internal cycle timer so as to phase-lock the reproduction timing clock to the time of the timestamp;
• and
• a data output section that reproduces the event sequence data contained in the received packets in synchronization to the reproduction timing clock.

A packet receiving apparatus for receiving packets from one or more of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• a timestamp output section that retrieves a timestamp from a packet which is received from the transmitting node;
• a reproduction timing clock generating section that generates a reproduction timing clock which is synchronized to the retrieved timestamp;
• a data output section that reproduces the event sequence data contained in packets received from each transmitting node in response to the reproduction timing clock;
• and
• a time adjusting section that operates when a time indicated by the timestamp retrieved by the timestamp output section coincides with a current time indicated by an internal cycle timer for controlling the data output section to reproduce a data block of the event sequence data which is contained in the same packet as the timestamp and which corresponds to the time indicated by the timestamp, wherein
• the data output section has a plurality of receiving buffers for writing therein the event sequence data, the receiving buffers being separately allotted to different transmitting nodes and further being assigned to different channels of the event sequence data contained in each packet, and for reproducing the event sequence data from the receiving buffers a channel by channel in response to the reproduction timing clock.

A packet receiving apparatus for receiving a packet from one or more of transmitting node located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the apparatus comprising:

• a reproduction timing clock generating section that generates a reproduction timing clock in synchronization to the timestamp contained in the packet;
• a data output section that reproduces each data block of event sequence data contained in the packet received from the transmitting node in response to the reproduction timing clock;
• and
• an output terminal provided to output the generated reproduction timing clock for external use of the reproduction timing clock.

A method of receiving packets with a plurality of receiving buffers from a plurality of transmitting nodes located on a network for reproduction of event sequence data through output channels, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• extracting the event sequence data and the timestamp from the packet;
• distributing the extracted event sequence data to the plurality of the receiving buffers for writing the event sequence data into the receiving buffers;
• and
• reading out the event sequence data from the receiving buffers in accordance with the extracted timestamp.

A method of receiving packets from one or more of transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• selecting a predetermined one of packets which are received sequentially for retrieving a timestamp contained in the predetermined packet;
• generating a reproduction timing clock used for synchronously reproducing the event sequence data contained in the sequentially received packets;
• comparing a time indicated by the timestamp retrieved from the predetermined packet with a current time indicated by an internal cycle timer so as to phase-lock the reproduction timing clock to the time of the timestamp;
• and
• reproducing the event sequence data contained in the sequentially received packets in synchronization to the reproduction timing clock.

A method of receiving packets with a plurality of data buffers and a pair of first and second timestamp buffers from a plurality of transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• extracting event sequence data and timestamps from received packets;
• distributing the extracted event sequence data to the plurality of the data buffers for writing the event sequence data into the data buffers;
• further writing a timestamp extracted from a particular packet into the first timestamp buffer and writing other timestamp extracted from other packet than the particular packet into the second timestamp buffer;
• and reading out the event sequence data from the data buffers in accordance with the timestamps written in the first timestamp buffer and the second timestamp buffer.

A method of receiving packets at a receiving node from a plurality of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• retrieving a timestamp contained in a packet received from a transmitting node;
• reproducing event sequence data contained in the same packet received from the transmitting node;
• setting an offset time for the receiving node relative to the transmitting node and adding the offset time to a time indicated by the retrieved timestamp;
• and
• effecting synchronous reproduction of the event sequence data contained in the same packet as the timestamp when the time of the timestamp added with the offset time coincides with a current time indicated by an internal cycle timer.

A method of receiving a packet from a transmitting node located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• generating a reproduction timing clock used for synchronous reproduction of the event sequence data contained in the packet based on the timestamp contained in the packet;
• outputting the generated reproduction timing clock externally from an output terminal;
• inputting an external reproduction timing clock into an input terminal;
• reproducing event sequence data contained in the packet received from the transmitting node by means of a data output device in synchronization to either of the generated reproduction timing clock and the external reproduction timing clock;
• and
• feeding the generated reproduction timing clock to the data output device and to the output terminal in a first mode;
• and
• otherwise feeding the external reproduction timing clock inputted from the input terminal to the data output device in a second mode.

A method of receiving packets from transmitting nodes located on a network by means of a plurality of packet handlers including a master packet handler and a slave packet hander, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• extracting the event sequence data and the timestamp from the packet;
• writing the extracted event sequence data into a receiving buffer provided in the master packet handler;
• reading out the event sequence data from the receiving buffer in synchronization to a reproduction timing clock to reproduce the event sequence data;
• operating the master packet handler to generate the reproduction timing clock in accordance with the extracted timestamp and to provide the generated reproduction timing clock to the slave packet handler;
• and
• operating the master packet handler when the receiving buffer thereof has no space to store the event sequence data for allocating the event sequence data to a receiving buffer of the slave packet handler.

A method of transmitting packets to receiving nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• arranging the event sequence data into data blocks and adding thereto a timestamp so as to sequentially produce packets;
• sequentially transmitting the packets;
• and
• detecting an error during production of the packets for stopping transmission of a regular packet containing event sequence data and for generating and transmitting a special packet containing a message indicative of occurrence of the error.

A method of receiving packets with a receiving buffer from transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• extracting the event sequence data and the timestamp from the packet;
• writing the extracted event sequence data into the receiving buffer;
• reproducing the event sequence data from the receiving buffer in synchronization to the extracted timestamp;
• and
• detecting occurrence of a timing error based on the extracted timestamp and other error in either of the writing step and the reproducing step for muting synchronous reproduction of the event sequence data.

A method of transmitting packets to receiving nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• sequentially inputting event sequence data from an external data source in response to an input clock signal having a leading edge and a trailing edge arranged at a predetermined period;
• generating a packet of the inputted event sequence data in response to the leading edge of the input clock signal and generating another packet in response to the trailing edge subsequent to the leading edge, thereby successively generating packets at a rate twice as fast as the input clock signal;
• adding the timestamp every time the predetermined number of data blocks are packetized;
• and
• sequentially transmitting the packets generated by the fast packetizing section.

A method of receiving packets from transmitting nodes located on a network to reproduce event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• sequentially receiving packets transmitted from one or more of the transmitting node;
• using a reproduction clock signal having a leading edge and a trailing edge arranged at a predetermined period for retrieving event sequence data from a packet at the leading edge of the reproduction clock signal and for retrieving event sequence data from a next packet at the trailing edge subsequent to the leading edge, thereby successively unpacketizing the packets at a rate twice as fast as the reproduction clock signal;
• and
• reproducing the event sequence data in response to the reproduction clock signal which is synchronized to the timestamps contained in the received packets.

A method of receiving packets from one or more of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• retrieving a timestamp from a packet which is received from one of the transmitting nodes;
• generating a reproduction timing clock used for synchronously reproducing the event sequence data contained in the received packet;
• comparing a time indicated by the retrieved timestamp with a current time indicated by an internal cycle timer so as to phase-lock the reproduction timing clock to the time of the timestamp;
• and
• reproducing the event sequence data contained in the received packets in synchronization to the reproduction timing clock.

A method of receiving packets from one or more of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• retrieving a timestamp from a packet which is received from the transmitting node;
• generating a reproduction timing clock which is synchronized to the retrieved timestamp;
• reproducing the event sequence data contained in packets received from each transmitting node in response to the reproduction timing clock;
• and
• adjustively reproducing a data block of the event sequence data which is contained in the same packet as the timestamp and which corresponds to the time indicated by the timestamp when a time indicated by the retrieved timestamp coincides with a current time indicated by an internal cycle timer,
• wherein the reproducing step uses a plurality of receiving buffers for writing therein the event sequence data, the receiving buffers being separately allotted to different transmitting nodes and further being assigned to different channels of the event sequence data contained in each packet, and for reproducing the event sequence data from the receiving buffers a channel by channel in response to the reproduction timing clock.

A method of receiving a packet from one or more of transmitting node located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, the method comprising the steps of:

• generating a reproduction timing clock in synchronization to the timestamp contained in the packet;
• reproducing each data block of event sequence data contained in the packet received from the transmitting node in response to the reproduction timing clock;
• and
• outputting the generated reproduction timing clock from an output terminal for external use of the reproduction timing clock.

A medium for use in a packet receiving machine having a CPU for receiving packets by a plurality of receiving buffers from a plurality of transmitting nodes located on a network for reproduction of event sequence data through output channels, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• extracting the event sequence data and the timestamp from the packet;
• distributing the extracted event sequence data to the plurality of the receiving buffers for writing the event sequence data into the receiving buffers;
• and
• reading out the event sequence data from the receiving buffers in accordance with the extracted timestamp.

A medium for use in a packet receiving machine having a CPU for receiving packets from one or more of transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• selecting a predetermined one of packets which are received sequentially for retrieving a timestamp contained in the predetermined packet;
• generating a reproduction timing clock used for synchronously reproducing the event sequence data contained in the sequentially received packets;
• comparing a time indicated by the timestamp retrieved from the predetermined packet with a current time indicated by an internal cycle timer so as to phase-lock the reproduction timing clock to the time of the timestamp;
• and
• reproducing the event sequence data contained in the sequentially received packets in synchronization to the reproduction timing clock.

A medium for use in a packet receiving machine having a CPU for receiving packets by a plurality of data buffers and a pair of first and second timestamp buffers from a plurality of transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• extracting event sequence data and timestamps from received packets;
• distributing the extracted event sequence data to the plurality of the data buffers for writing the event sequence data into the data buffers;
• further writing a timestamp extracted from a particular packet into the first timestamp buffer and writing other timestamp extracted from other packet than the particular packet into the second timestamp buffer;
• and
• reading out the event sequence data from the data buffers in accordance with the timestamps written in the first timestamp buffer and the second timestamp buffer.

A medium for use in a packet receiving machine having a CPU for receiving packets at a receiving node from a plurality of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• retrieving a timestamp contained in a packet received from a transmitting node;
• reproducing event sequence data contained in the same packet received from the transmitting node;
• setting an offset time for the receiving node relative to the transmitting node and adding the offset time to a time indicated by the retrieved timestamp;
• and
• effecting synchronous reproduction of the event sequence data contained in the same packet as the timestamp when the time of the timestamp added with the offset time coincides with a current time indicated by an internal cycle timer.

A medium for use in a packet receiving machine having a CPU for receiving a packet from a transmitting node located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• generating a reproduction timing clock used for synchronous reproduction of the event sequence data contained in the packet based on the timestamp contained in the packet;
• outputting the generated reproduction timing clock externally from an output terminal;
• inputting an external reproduction timing clock into an input terminal;
• reproducing event sequence data contained in the packet received from the transmitting node by means of a data output device in synchronization to either of the generated reproduction timing clock and the external reproduction timing clock;
• and
• feeding the generated reproduction timing clock to the data output device and to the output terminal in a first mode;
• and
• otherwise feeding the external reproduction timing clock inputted from the input terminal to the data output device in a second mode.

A medium for use in a packet receiving machine for receiving packets from transmitting nodes located on a network by means of a plurality of packet handlers including a master packet handler and a slave packet hander, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• extracting the event sequence data and the timestamp from the packet;
• writing the extracted event sequence data into a receiving buffer provided in the master packet handler;
• reading out the event sequence data from the receiving buffer in synchronization to a reproduction timing clock to reproduce the event sequence data;
• operating the master packet handler to generate the reproduction timing clock in accordance with the extracted timestamp and to provide the generated reproduction timing clock to the slave packet handler;
• and
• operating the master packet handler when the receiving buffer thereof has no space to store the event sequence data for allocating the event sequence data to a receiving buffer of the slave packet handler.

A medium for use in a packet transmitting machine for transmitting packets to receiving nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet transmitting machine to perform a process comprising the steps of:

• arranging the event sequence data into data blocks and adding thereto a timestamp so as to sequentially produce packets;
• sequentially transmitting the packets;
• and
• detecting an error during production of the packets for stopping transmission of a regular packet containing event sequence data and for generating and transmitting a special packet containing a message indicative of occurrence of the error.

A medium for use in a packet receiving machine having a CPU for receiving packets by a receiving buffer from transmitting nodes located on a network for reproduction of event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• extracting the event sequence data and the timestamp from the packet;
• writing the extracted event sequence data into the receiving buffer;
• reproducing the event sequence data from the receiving buffer in synchronization to the extracted timestamp;
• and
• detecting occurrence of a timing error based on the extracted timestamp and other error in either of the writing step and the reproducing step for muting synchronous reproduction of the event sequence data.

A medium for use in a packet transmitting machine having a CPU for transmitting packets to receiving nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet transmitting machine to perform a process comprising the steps of:

• sequentially inputting event sequence data from an external data source in response to an input clock signal having a leading edge and a trailing edge arranged at a predetermined period;
• generating a packet of the inputted event sequence data in response to the leading edge of the input clock signal and generating another packet in response to the trailing edge subsequent to the leading edge, thereby successively generating packets at a rate twice as fast as the input clock signal;
• adding the timestamp every time the predetermined number of data blocks are packetized;
• and
• sequentially transmitting the packets generated by the fast packetizing section.

A medium for use in a packet receiving machine having a CPU for receiving packets from transmitting nodes located on a network to reproduce event sequence data, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• sequentially receiving packets transmitted from one or more of the transmitting node;
• using a reproduction clock signal having a leading edge and a trailing edge arranged at a predetermined period for retrieving event sequence data from a packet at the leading edge of the reproduction clock signal and for retrieving event sequence data from a next packet at the trailing edge subsequent to the leading edge, thereby successively unpacketizing the packets at a rate twice as fast as the reproduction clock signal;
• and
• reproducing the event sequence data in response to the reproduction clock signal which is synchronized to the timestamps contained in the received packets.

A medium for use in a packet receiving machine having a CPU for receiving packets from one or more of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• retrieving a timestamp from a packet which is received from one of the transmitting nodes;
• generating a reproduction timing clock used for synchronously reproducing the event sequence data contained in the received packet;
• comparing a time indicated by the retrieved timestamp with a current time indicated by an internal cycle timer so as to phase-lock the reproduction timing clock to the time of the timestamp;
• and
• reproducing the event sequence data contained in the received packets in synchronization to the reproduction timing clock.

A medium for use in a packet receiving machine having a CPU for receiving packets from one or more of transmitting nodes located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• retrieving a timestamp from a packet which is received from the transmitting node;
• generating a reproduction timing clock which is synchronized to the retrieved timestamp;
• reproducing the event sequence data contained in packets received from each transmitting node in response to the reproduction timing clock;
• and
• adjustively reproducing a data block of the event sequence data which is contained in the same packet as the timestamp and which corresponds to the time indicated by the timestamp when a time indicated by the retrieved timestamp coincides with a current time indicated by an internal cycle timer,
• wherein the reproducing step uses a plurality of receiving buffers for writing therein the event sequence data, the receiving buffers being separately allotted to different transmitting nodes and further being assigned to different channels of the event sequence data contained in each packet, and for reproducing the event sequence data from the receiving buffers a channel by channel in response to the reproduction timing clock.

A medium for use in a packet receiving machine having a CPU for receiving a packet from one or more of transmitting node located on a network, the packet containing at least one data block composed of at least one event sequence data and a timestamp added per a predetermined number of data blocks, wherein the medium contains program instructions executable by the CPU for causing the packet receiving machine to perform a process comprising the steps of:

• generating a reproduction timing clock in synchronization to the timestamp contained in the packet;
• reproducing each data block of event sequence data contained in the packet received from the transmitting node in response to the reproduction timing clock;
• and
• outputting the generated reproduction timing clock from an output terminal for external use of the reproduction timing clock.