Packet data system recording time stamps and packet data on tracks formed on a storage medium in synchronism with changes in time stamp values

A method of recording input packets on a storage medium comprising the steps of:

• generating arrival time control clocks for the input packets;
• producing time stamps having values which indicate times of arrivals of the input packets and which are changed in synchronism with the arrival time control clocks to add the time stamps to the packets, respectively;
• forming tracks on the storage medium in sequence in response to reference control signals provided in synchronism with said arrival time control clocks and in synchronism with respective changes in time stamp values;
• and
• recording the packets to which the time stamps are added on the storage medium in order of arrivals of the packets so that each of the packets is recorded within a given area ranging from a first position to a second position across a reference position, the reference position being defined on one of the tracks corresponding to an arrival time of each of the packets, the first and second positions being defined away from the reference position at preselected distances toward the tracks preceding and following the one of the tracks, respectively.

A method of recording input packets on a storage medium comprising the steps of:

• generating arrival time control clocks in synchronism with changes in value of time stamps for arrival time identification added to the input packets;
• forming tracks on the storage medium in sequence in response to reference control signals provided in synchronism with said arrival time control clocks and in synchronism with respective changes in time stamp values;
• and
• recording the packets with the time stamps on the storage medium in order of arrivals of the packets so that each of the packets is recorded within a given area ranging from a first position to a second position across a reference position, the reference position being defined on one of the tracks corresponding to an arrival time of each of the packets, the first and second positions being defined away from the reference position at preselected distances toward the tracks preceding and following the one of the tracks, respectively.

A method of recording input packets on a storage medium comprising the steps of:

• generating arrival time control clocks for the input packets;
• producing time stamps having values which indicate times of arrivals of the input packets and which are changed in synchronism with the arrival time control clocks to add the time stamps to the packets, respectively;
• forming tracks on the storage medium in time sequence in response to reference control signals provided in synchronism with said arrival time control clocks and in synchronism with respective changes in time stamp values;
• and
• recording the packets to which the time stamps are added on the storage medium in order of arrivals of the packets so as to shift toward a first one of the packets at least one of the packets following the first one of the packets within a given area ranging from a reference position defined on one of the tracks corresponding to an arrival time of the first one of the packets to a given position away from the reference position at a preselected distance toward the following tracks.

A method of recording input packets on a storage medium comprising the steps of:

• generating arrival time control clocks in synchronism with changes in value of time stamps for arrival time identification added to the input packets;
• forming respective tracks on the storage medium in sequence in response to reference control signals provided in synchronism with said arrival time control clocks and in synchronism with respective changes in time stamp values;
• and
• recording the packets to which the time stamps are added on the storage medium in order of arrivals of the packets so as to shift toward a first one of the packets at least one of the packets following the first one of the packets within a given area ranging from a reference position defined on one of the tracks corresponding to an arrival time of the first one of the packets to a given position away from the reference position at a preselected distance toward the following tracks.

A packet recording apparatus for recording packets on tracks formed in time sequence on a storage medium comprising:

• clock generating means for generating arrival time control clocks;
• time stamp producing means for producing time stamps in synchronism with said arrival time control clocks for identifying arrival times of the packets to add the time stamps to the packets, respectively;
• track forming means for forming tracks on the storage medium in time sequence in response to reference control signals provided in synchronism with said arrival time control clocks and in synchronism with respective changes in time stamp values;
• and
• recording means for recording the packets to which said time stamps are added on the storage medium in order of arrivals of the packets so that each of the packets is recorded within a given area ranging from a reference position defined on one of the tracks corresponding to an arrival time of each of the tracks to a given position away from the reference position at a preselected distance toward the following track.

A packet recording apparatus for recording packets on tracks formed in time sequence on a storage medium comprising:

• clock generating means for generating arrival time control clocks;
• time stamp producing means for producing time stamps in synchronism with said arrival time control clocks for identifying arrival times of the packets to add the time stamps to the packets, respectively;
• track forming means for forming tracks on the storage medium in time sequence in response to reference control signals provided in synchronism with said arrival time control clocks and in synchronism with respective changes in time stamp values;
• and
• recording means for recording the packets to which said time stamps are added on the storage medium in order of arrivals of the packets so that each of the packets is recorded within a given area ranging from a first position to a second position across a reference position, the reference position being defined on one of the tracks corresponding to an arrival time of each of the packets, the first and second positions being defined away from the reference position at preselected distances toward the tracks preceding and following the one of the tracks, respectively.

A packet recording/reproducing apparatus comprising:

• recording means for recording tracks, in time sequence, on a first magnetic tape helically wrapped about a given area of a rotary drum using rotary heads disposed in the rotary drum to record input packets on the tracks in order of arrival of the input packets;
• reproducing means for reproducing tracks formed in time sequence on a second magnetic tape to reproduce packets recorded on the tracks of the second magnetic tape through the rotary heads of the rotary drum;
• clock generating means for generating arrival time control clocks;
• first speed control means for controlling the speed of the rotary drum so as to synchronize with the arrival time control clocks every six of tracks;
• time stamp producing means for producing time stamps in synchronism with said arrival time control clocks to add the time stamps to the packets to be recorded on the first magnetic tape, respectively;
• record controlling means for controlling said recording means so that each of the packets is recorded within a one-track area, a two-track area, or a one-track over area, the one-track area ranging from a reference position defined on one of the tracks corresponding to an arrival time of each of the tracks to a given position away from the reference position at a given interval toward the following track, the two-track area ranging from a first position to a second position which are defined away from the reference position at preselected distances toward the tracks preceding and following said one of the tracks, respectively, the one-track over area ranging from a record-starting position on said one of the tracks to a predetermined position away from the record-starting position at a preselected interval toward the following tracks;
• clock generating means for generating clocks having a given frequency;
• second speed control means for controlling the speeds of the rotary drum and the second magnetic tape at six-track intervals based on signals reproduced from the second magnetic tape and said clocks generated by said clock generating means;
• output control clock generating means for generating output control clocks after a delay of given time from said clocks generated by said clock generating means, respectively;
• comparing means comparing a vale changed in synchronism with said output control clocks with one of the time stamps reproduced from the second magnetic tape to provide a signal when said value coincides with said one of the time stamps;
• outputting means for outputting one of the packets to which said one of the time stamp is added;
• and
• time stamp removing means for removing the time stamp from said one of the packets outputted from said outputting means.

A packet recording/reproducing apparatus comprising:

• recording means for recording tracks, in time sequence, on a first magnetic tape helically wrapped about a given area of a rotary drum using rotary heads disposed in the rotary drum to record input packets on the tracks in order of arrival of the input packets;
• reproducing means for reproducing tracks formed in time sequence on a second magnetic tape to reproduce packets recorded on the tracks of the second magnetic tape through the rotary heads of the rotary drum;
• clock generating means for generating arrival time control clocks which are synchronous with values of time stamps added to the packets to be recorded on the first magnetic tape;
• first speed control means for controlling the speed of the rotary drum so as to synchronize with the arrival time control clocks every six of tracks;
• record controlling means for controlling said recording means so that each of the packets is recorded within a one-track area, a two-track area, or a one-track over area, the one-track area ranging from a reference position defined on one of the tracks corresponding to an arrival time of each of the packets to a given position away from the reference position at a given interval toward the following track, the two-track area ranging from a first position to a second position which are defined away from the reference position at preselected distances toward the tracks preceding and following said one of the tracks, respectively, the one-track over area ranging from a record-starting position on said one of the tracks to a predetermined position away from the record-starting position at a preselected interval toward the following tracks;
• clock generating means for generating clocks having a given frequency;
• second speed control means for controlling the speeds of the rotary drum and the second magnetic tape at six-track intervals based on signals reproduced from the second magnetic tape and said clocks generated by said clock generating means;
• output control clock generating means for generating output control clocks after a delay of given time from said clocks generated by said clock generating means, respectively;
• comparing means comparing a value changed in synchronism with said output control clocks with one of the time stamps reproduced from the second magnetic tape to provide a signal when said value coincides with said one of the time stamps;
• and
• outputting means for outputting one of the packets to which said one of the time stamp is added.

A packet recording apparatus for recording input digital signals multiplexing packets of information on at least one program and a time control packet including a program clock reference on the program, comprising:

• time stamp producing means for producing time stamps having values which indicate times of arrivals of the packets and adding the time stamps to the packets;
• extracting means for extracting the program clock reference from the digital signals;
• clock generating means for generating clocks which are synchronous with input of the program clock reference extracted by said extracting means;
• reference control signal generating means for generating reference control signals in synchronism with the clocks generated by said clock generating means;
• and
• recording means for recording tracks on a storage medium in time sequence in response to the reference control signals generated by said reference control signal generating means and in synchronism with changes in time stamp, and for recording each said digital signals on one of the tracks.