EP0658984A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Perceptual audio coding allocating non-used bits to data channel
Assignee: AT&T Inc
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Filing: 1994-12-01
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Granted: —
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Expires: 2014-12-01
Abstract
Abstract A varying number of bits needed to perceptually encode (in 250) a constant time portion of an audio and/or video (including images) signal (from 100) permits the signal to be combined with a second signal (204) to generate output blocks (from 700). These audio/or video signals may be generally described as signals that are encoded according to a perceptual encoding technique. A method of forming a digital output signal comprises inputting a first signal and a second signal into a digital output signal former (700) and selectively combining a set of information with the first signal to generate a set of superblocks.
Inventors
- 👤 Sean Matthew Dorward
- 👤 Jayant Nuggehally Sampath
- 👤 James David Johnston
- 👤 Schuyler Reynier Quackenbush
- 👤 Kenneth Lane Thompson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:50
CPC Classifications
H; H03; H03M; H03M7/00; H04; H04L; H04L1/00; H04L1/004; H04L1/0041; H04B; H04B1/00; H04B1/66; H04B1/665
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A method comprising the steps of: (a) receiving a first digital signal representing a perceptual stimulus; (b) dividing the first digital signal into a sequence of time blocks of equal duration; and (c) for each time block in the sequence of time blocks: (1) encoding the time block using a perceptual encoding method, the encoded time block being represented by a number of bits, NU i , less than or equal to a predetermined number N i , wherein N i is a maximum number of bits allowed to encode the i th encoded time block; (2) receiving a second digital signal; and (3) generating an N i -bit output block comprising the encoded time block and a portion of the second digital signal comprising less than or equal to NA i bits, wherein NA i represents the difference between N i and NU i .
Claim 2
Dependent Claim
13 words
The method of claim 1 wherein the perceptual stimulus is an audio signal.
Claim 3
Independent Claim
133 words
A method of forming a digital output signal comprising: (a) inputting a signal into a selective combiner, the signal being encoded according to a perceptual encoding method to generate a set of encoded blocks, each encoded block being represented by a number of bits, NU i , the number of bits being variable from encoded block to encoded block and being less than or equal to a respective predetermined number N i ; and (b) outputting a digital output signal from the selective combiner, the digital output signal comprising a set of superblocks, each superblock in the set of superblocks comprising NU i bits representing one encoded block and a number of bits of a digital signal which is less than or equal to the difference between N i and NU i .
Claim 4
Independent Claim
136 words
A method comprising the steps of: (a) receiving a first digital signal representing a human sensory signal; (b) encoding the first digital signal into a sequence of encoded blocks using a perceptual encoding method; (c) representing each encoded block in the sequence of encoded blocks by a number of bits, NU i , less than or equal to a predetermined number N i , wherein N i is a maximum number of bits allowed to encode the i th encoded block; and (d) for each encoded block: (1) receiving a second digital signal; and (2) generating an N i -bit output block comprising the encoded block and a portion of the second digital signal comprising less than or equal to NA i bits, wherein NA i represents the difference between N i and NU i .
References Cited (Backward Citations)
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