US5521918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive bit stream demultiplexing apparatus in a decoding system
Assignee: Quarterhill Inc
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Filing: 1994-12-30
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Granted: 1996-05-28
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Expires: 2014-12-30
Abstract
Abstract An apparatus for adaptively demultiplexing an input bit stream for use in a decoding system includes a buffer module having a plurality of buffers for temporarily storing the bit stream, a flag state detector for detecting the number of the buffers that exhibits the full state or the empty state and a buffer module controller for adaptively controlling the overflow or the underflow of the buffers, based on the information from the flag state detector.
Inventors
- 👤 Keun-Hwan Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/112; H04N21/00; H04N21/40; H04N21/43; H04N21/434; H04N21/4341; H04N19/134; H04N19/146; H04N19/15; H04N19/152; H04N21/439; H04N21/4392
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
248 words
An apparatus for adaptively demultiplexing an input bit stream for use in a decoding system having a decoder for decoding the input bit stream to produce a moving picture and its associated sound, the input bit stream representing a video data bit stream for the moving picture and an audio data bit stream for the sound, which comprises: an input FIFO (First-In-First-Out) buffer module having a plurality of input FIFO buffer in series for temporarily storing the input bit stream; a video FIFO buffer module having a plurality of video FIFO buffers in series for temporarily storing the video data bit stream; an audio FIFO buffer module having a plurality of audio FIFO buffers in series for temporarily storing the audio data bit stream; means for determining the full or the empty state of each of the input FIFO buffers, the video FIFO buffers and the audio FIFO buffers to thereby produce a buffer status signal indicative of the full or the empty states of the FIFO buffers in the input, the video and the audio FIFO buffer modules; means, in response to the buffer status signal, for adaptively fetching the input bit stream from the input FIFO buffers that are in the full state; and means for demultiplexing the fetched bit stream to produce the video and the audio data bit streams and providing the video and the audio data bit streams to the video and the audio FIFO buffers that are in the empty state, respectively.
Claim 2
Independent Claim
248 words
An apparatus for adaptively demultiplexing an input bit stream for use in a decoding system having a decoder for decoding the input bit stream to produce a moving picture and its associated sound, the input bit stream representing a video data bit stream for the moving picture and an audio data bit stream for the sound, which comprises: an input FIFO (First-In-First-Out) buffer module having a plurality of input FIFO buffer in series for temporarily storing the input bit stream; a video FIFO buffer module having a plurality of video FIFO buffers in series for temporarily storing the video data bit stream; an audio FIFO buffer module having a plurality of audio FIFO buffers in series for temporarily storing the audio data bit stream; means for determining the full or the empty state of each of the input FIFO buffers, the video FIFO buffers and the audio FIFO buffers to thereby produce a buffer status signal indicative of the full or the empty states of the FIFO buffers in the input, the video and the audio FIFO buffer modules; means, in response to the buffer status signal, for adaptively fetching the input bit stream from the input FIFO buffers that are in the full state; and means for demultiplexing the fetched bit stream to produce the video and the audio data bit streams and providing the video and the audio data bit streams to the video and the audio FIFO buffers that are in the empty state, respectively.
Claim 3
Dependent Claim
133 words
The apparatus as recited in claim 1, wherein the dertemining means includes three same set of the detectors for the input FIFO buffer module, the video FIFO buffer module and the audio FIFO buffer module, respectively, each of the detectors further comprising: a first logic part for detecting the condition that none of the FIFO buffers is in the full or the empty state; a second logic part for detecting the condition that at least one FIFO buffer is in the full or the empty state; a third logic part for detecting the condition that all of the FIFO buffers are in the full or the empty state; and an encoder, in response to the resultant outputs from the first, the second and the third logic parts, for generating the buffer status signal.
Claim 4
Dependent Claim
52 words
The apparatus as recited in claim 2, wherein the demultiplexing means further includes temporary storage means for respectively storing the video and the audio data bit streams before the video and the audio data bit streams being provided to the video and audio FIFO buffers that are in the empty state, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-28 | 1999-11-27 | 2000-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-28 | 2003-11-27 | 2004-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-28 | 2007-11-27 | 2008-05-28 | $7700.00 | Window Closed / Lapsed |