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AssigneePioneer Corporation
InventorsKinya Ono, Kunihiro Minoshima, Hidemi Usuba, Sho Murakoshi, Makoto Matsumaru, Seiichi Hasebe
Estimating the term…
A reception interface unit in a transmission system wherein time series data is divided into data groups and a data packet with reproduction specification time data specifying a time at which each data piece in the data groups should be reproduced, added to the data groups is transmitted on a transmission bus in a time division manner. The interface unit has a cycle timer for counting the reference time of the home device based on the reference time on the transmission bus, a unit for extracting the reproduction specification time data in the data groups from a signal received via the transmission bus and storing the reproduction specification time data in a buffer, a reception buffer for inputting and storing the data pieces in the data groups in order and reading out the data pieces in the storage order responsive to a reproduction clock, a match detector for generating a reference clock pulse if the reference time of the home device matches the reproduction specification time, and a PLL circuit being responsive to the reference clock pulse for generating a clock signal which is phase synchronized with the reference clock pulse as the reproduction clock. When the reference time on the transmission bus changes, the data stored in the buffer in the reproduction specification time data extraction unit and the data stored in the reception buffer are all deleted.
A reception interface unit in a transmission system wherein time series data is divided into data groups and a data packet including reproduction specification time data specifying a time at which each data piece in the data groups should be reproduced, added to the data groups is transmitted on a transmission bus in a time division manner, said reception interface unit comprising:
A reception interface unit in a transmission system wherein time series data is divided into data groups and a data packet including reproduction specification time data specifying a time at which each data piece in the data groups should be reproduced, added to the data groups is transmitted on a transmission bus in a time division manner, said reception interface unit comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Including multiple buffers, e.g. buffer pools: with buffers of different sizes
Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers: synchronisation of packets and cells, e.g.…
Architecture of a communication node: details regarding a bus interface enhancer
High-speed IEEE 1394 serial bus: packet processing; Packet format
Term end not estimated
1. Field of the Invention
This invention relates to a reception interface unit in a transmission system for putting time series digital data into a data packet and transferring the data packet at high speed.
2. Description of the Related Art
In the accompanying drawings:
FIG. 1 is a drawing to show electric devices connected by a high-speed serial data transfer interface;
FIG. 2 is a drawing to describe a root node determination method in topology in which nodes A to F are connected;
Referring now to the accompanying drawings, there are shown preferred embodiments of the invention.
FIG. 1 shows a data transfer system incorporating the invention. The data transfer system includes a high-speed serial data transfer interface based on the IEEE1394-1995 standard, wherein a plurality of electric devices 11 to 15 are detachably connected using cables and connectors in a daisy chain manner and a branch manner. The electric devices 11 to 15 refer to devices for inputting or outputting digital data, such as digital video tape recorders, digital video disc players, personal computers, digital video cameras, hard disk drives, scanners, and printers. That is, the electric devices include not only personal computers and peripheral devices connected thereto, but also household electric devices for inputting or outputting digital data. If each of the electric devices 11 to 15 is connected only at the termination of the daisy chain, it may include one connector jack; a device enabling the daisy chain manner includes two connector jacks and a device enabling the branch manner includes three or more connector jacks. A connector plug connected to a connector jack is provided at either end of each cable. A path provided by the cables for connecting the devices is a data transfer bus.
Next, a data transfer protocol of the IEEE1394-1995 standard will be discussed. In this protocol, electric devices are referred to as nodes, which are given node IDs for discriminating the electronic devices from each other. The node is either a branch node or a leaf node. That is, the branch node is a node connected to two or more nodes and the leaf node is a termination node connected only to one node. In a state in which a number of nodes are connected, a bus reset signal is generated when power is turned on, when an additional node is connected to the bus, or when any node is disconnected from the bus. After the bus is reset, a root node is determined among the nodes.