Audio/video/data component system bus
First Claim
1. A method for communicating compressed signal between components of an audio video system wherein the compressed signal is sourced in MPEG-like transport packets, and the component receiving the sourced transport packets includes a system clock, said method comprising:
- counting pulses of said system clock modulo M, M an integer, to generate count values;
capturing a current count value at a predetermined instance associated with an occurrence of a sourced transport packet;
forming a bit serial superpacket containing the captured count value and corresponding transport packet in mutually exclusive portions of said superpacket;
conveying the superpacket to said components on a bus.
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Abstract
A system for interconnecting audio, video and data signals available in compressed form includes a bus having a plurality of channels for transmitting signal. A bus interface is located at respective signal processing devices, which interface includes a decoder to control the respective interface responsive to control signal transmitted in one of the channels. Data is transmitted in the channels in a superpacket structure. Processing devices which generate signal to be applied to the bus, such as a receiver which provides MPEG transport packets, include apparatus to form such superpackets. Respective superpackets include at least a transport packet and a timestamp related to the timing of occurrence of the transport packet. The transport packet and timestamp are located in predetermined positions within respective superpackets.
64 Citations
16 Claims
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1. A method for communicating compressed signal between components of an audio video system wherein the compressed signal is sourced in MPEG-like transport packets, and the component receiving the sourced transport packets includes a system clock, said method comprising:
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counting pulses of said system clock modulo M, M an integer, to generate count values; capturing a current count value at a predetermined instance associated with an occurrence of a sourced transport packet; forming a bit serial superpacket containing the captured count value and corresponding transport packet in mutually exclusive portions of said superpacket; conveying the superpacket to said components on a bus. - View Dependent Claims (2, 3, 4)
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5. A method for communicating compressed signal between components of an audio video system wherein compressed signal is sourced in transport packets, and a component receiving the sourced transport packets includes a system clock, said method comprising:
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counting pulses of said system clock modulo M, M an integer, to generate count values; capturing a current count value at a predetermined instance associated with an occurrence of a sourced transport packet; providing playback rate codes for use by a recording component, which playback rate codes define a ratio relating the rates of reception of signal to be recorded and the rate that such signal be played back; and forming a bit serial superpacket containing the captured count value, said playback rate codes, and corresponding transport packet in mutually exclusive portions of said superpacket; and conveying the superpacket to said components on a bus. - View Dependent Claims (6, 7)
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8. Apparatus for conveying compressed signal between components of an audio video system comprising:
an AVD bus including conductor sections coupled in cascade connection with bus interfaces, respective said conductor sections including a plurality of conductors, at least one of which is reserved for control signals, and respective said interfaces comprising; first and second bi-directional input/output ports for connection to respective conductor sections; an input port connected to a first intermediate node for coupling an output of a component to said AVD bus; an output connected to a second intermediate node for coupling an input of said component to said AVD bus; first and second switch means, responsive to control signals, for selectively respectively coupling corresponding conductors of said first and second bi-directional input/output ports to said first intermediate node; third and fourth switch means, responsive to control signals, for selectively respectively coupling said corresponding conductors of said first and second bi-direction input/output ports to said second intermediate node; and control means for providing said control signals. - View Dependent Claims (9)
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10. An interface for conveying transport packet signals on a bi-directional AVD bus to respective AVD components, said interface comprising:
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a source of compressed signal occurring in MPEG-like transport packets; a system clock; a modulo M counter for counting pulses of said system clock and providing count values; means for capturing a count value at a predetermined instant associated with a respective MPEG-like transport packet; a formatter, coupled to said source, said means for capturing a count value and said AVD bus, for assembling a superpacket including a captured count value and associated MPEG-like transport packet in mutually exclusive portions of said superpacket, and applying said superpacket to said AVD bus. - View Dependent Claims (11, 12, 13)
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- 14. Apparatus for communicating compressed data, occurring in a stream of multiplexed transport packets, amongst component devices, comprising a source of said transport packets, means for generating timestamps associated with respective said transport packets, and means for forming a superpacket including said timestamp and an associated transport packet in mutually exclusive fields of said superpacket, and applying same to a bus interconnecting said component devices.
Specification