Method of and apparatus for separating audio and video data from a combined audio/video stream of data

• US 6,191,822 B1
• Filed: 06/20/1997
• Issued: 02/20/2001
• Est. Priority Date: 06/20/1997
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Smyers, Scott D.
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): DESIR, JEAN WICEL
• Application Number:
  US08/879,866
• Time in Patent Office: 1,341 Days
• Field of Search: 348/484, 348/738, 348/482, 348/483, 348/423, 348/552, 348/843, 348/845.1, 348/845.2, 348/845.3, 348/722, 348/553, 348/725, 348/13, 386/75, 386/98, 386/109
• US Class Current: 348/552
• CPC Class Codes: H04L 12/40058 Isochronous transmission
• CPC Class Codes: H04L 12/40117 Interconnection of audio or video/imaging devices home automation networks H04L12/2803; bitstream network arrangements specially adapted for distribution of digital video signals H04N7/24
• CPC Class Codes: H04N 21/4135 external recorder interface circuits between an apparatus for recording television signals and a television receiver H04N5/775
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4341 Demultiplexing of audio and video streams
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/43632 involving a wired protocol, e.g. IEEE 1394 high-speed IEEE 1394 serial bus H04L12/40052
• CPC Class Codes: H04N 21/6143 involving transmission via a satellite

Abstract

A separator circuit receives a stream of data including both audio and video components. The separator circuit separates the audio and video components for transmission to appropriate devices. In the preferred embodiment, the separator circuit is part of a decompression engine which decompresses the received stream of data and also separates the audio and video components. Preferably, the decompression engine is implemented within a device configured for coupling to an IEEE 1394-1995 serial bus network. Alternatively, the decompression engine is implemented as a separate dedicated device within the IEEE 1394-1995 serial bus network. After separating the audio and video components, one or both of those components are transmitted from the decompression engine over one or more isochronous channels on the IEEE 1394-1995 serial bus, to the appropriate devices. When the decompression engine is implemented within a device, an appropriate one of the audio or video components is sent to circuits within the device while the other component is transmitted over the IEEE 1394-1995 serial bus.

Claims

1. A decompression engine for decompressing a compressed stream of data including a plurality of components, comprising:

a. an interface circuit configured for coupling to a bus structure for receiving and transmitting data over the bus structure including a combined stream of data having the plurality of components;

b. a decompression circuit coupled to the interface circuit for decompressing the combined stream of data thereby forming a decompressed stream of data; and

c. a separating circuit for separating the plurality of components within the decompressed stream of data into separate and decompressed component streams of data, wherein at least one of the separate and decompressed component streams of data is transmitted through the interface circuit over the bus structure to a remote device.

2. The decompression engine as claimed in claim 1 wherein the decompression circuit is included within a local device and further wherein at least one of the separate and decompressed component streams of data is sent to components within the local device.

3. The decompression engine as claimed in claim 2 wherein the compressed stream of data is received in an MPEG format.

4. The decompression engine as claimed in claim 3 wherein the separate and decompressed component streams of data represent audio and video data.

5. The decompression engine as claimed in claim 4 wherein the bus structure is an IEEE 1394-1995 serial bus structure.

6. A television for displaying video information comprising:

a. a display for displaying video information;

b. a display driver coupled to the display for controlling the display and providing the video information to be displayed;

c. an interface circuit configured for coupling to a bus structure for receiving and transmitting data over the bus structure including a combined stream of data having audio and video components; and

d. a decompression engine coupled to the interface circuit and to the display driver for decompressing the combined stream of data thereby forming a decompressed stream of data and separating the decompressed stream of data into an audio stream of data and a video stream of data, wherein the audio stream of data is transmitted through the interface circuit and over the bus structure to a remote device and the video stream of data is sent to the display driver to be displayed on the display.

7. The television as claimed in claim 6 wherein the combined stream of data is received in an MPEG format.

8. The television as claimed in claim 6 wherein the bus structure is an IEEE 1394-1995 serial bus structure.

9. The television as claimed in claim 8 wherein the combined stream of data is received on a first isochronous channel.

10. The television as claimed in claim 8 wherein the audio stream of data is transmitted on a second isochronous channel.

11. A home entertainment system comprising:

a. a plurality of devices;

b. an IEEE 1394-1995 serial bus structure coupled between the plurality of devices to transmit data between the devices including a combined stream of data having a plurality of components; and

c. a decompression engine coupled to the bus structure and to the plurality of devices to decompress the combined stream of data, thereby forming a decompressed stream of data, and separate the decompressed stream of data into an audio stream of data and a video stream of data, wherein the audio stream of data is transmitted to one or more of the plurality of devices and the video stream of data is transmitted to one or more of the plurality of devices, the decompression engine including;

i. an interface circuit coupled to the bus structure to receive and transmit data over the bus structure including the combined stream of data, the audio stream of data and the video stream of data;

ii. a decompression circuit coupled to the interface circuit to decompress the combined stream of data to form the decompressed stream of data; and

iii. a separating circuit to separate the plurality of components into the audio stream of data and the video stream of data, wherein at least one of the audio stream of data and the video stream of data is transmitted through the interface circuit over the bus structure to a remote one of the plurality of devices.

12. The home entertainment system as claimed in claim 11 wherein the decompression engine is included within one of the plurality of devices.

13. The home entertainment system as claimed in claim 11 wherein the decompression engine is a stand-alone device.

14. The home entertainment system as claimed in claim 11 wherein the combined stream of data is received by the decompression engine in an MPEG format.

15. The home entertainment system as claimed in claim 11 wherein the plurality of devices include a television and an audio amplifier.