Method of and apparatus for processing at least one coded binary audio flux organized into frames
First Claim
1. A method of processing at least one coded binary stream organized in the form of frames created from digital audio signals which were coded by at least an audio terminal in order to output processed frames to a subsequent using step, said coding of said digital audio signals including calculating transform coefficients by transforming the digital audio signals from the time domain to the frequency domain, then quantizing and coding said transform coefficients according to a set of quantizers determined by selection parameters extracted from said digital audio signals, said frames including said selection parameters and the thus-coded transform coefficients, the method comprising, for said at least one audio stream received from at least said terminal:
- (1) obtaining said selection parameters from said frames of said audio stream and determining from said selection parameters the set of quantizers that was used during the quantizing step performed by said audio terminal;
(2) recovering the transform coefficients that were calculated by said audio terminal by partially decoding and dequantizing said frames, the recovering being performed by using the set of quantizers determined in step (1);
(3) producing processed frames by performing said specific process in the frequency domain on the dequantized transform coefficients obtained in step (2); and
(4) supplying said processed frames to a subsequent using step.
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Abstract
At least one coded binary audio flux organized into frames is created from digital audio signals which were coded by transforming them from the time domain into the frequency domain. Transform coefficients of the signals in the frequency domain are quantized and coded according to a set of quantizers. The set is determined from a set of values extracted from the signals. The values make up selection parameters of the set of quantizers. The parameters are also present in the frames. A partial decoding state decodes then dequantizes transform coefficients produced by the coding based on a set of quantizers determined from the selection parameters contained in the frames of the coded binary audio flux or of each coded binary audio flux. The partially decoded frames are subjected to processing in the frequency domain. The thus-processed frames are then made available for use in a later utilization step.
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Citations
32 Claims
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1. A method of processing at least one coded binary stream organized in the form of frames created from digital audio signals which were coded by at least an audio terminal in order to output processed frames to a subsequent using step, said coding of said digital audio signals including calculating transform coefficients by transforming the digital audio signals from the time domain to the frequency domain, then quantizing and coding said transform coefficients according to a set of quantizers determined by selection parameters extracted from said digital audio signals, said frames including said selection parameters and the thus-coded transform coefficients, the method comprising, for said at least one audio stream received from at least said terminal:
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(1) obtaining said selection parameters from said frames of said audio stream and determining from said selection parameters the set of quantizers that was used during the quantizing step performed by said audio terminal;
(2) recovering the transform coefficients that were calculated by said audio terminal by partially decoding and dequantizing said frames, the recovering being performed by using the set of quantizers determined in step (1);
(3) producing processed frames by performing said specific process in the frequency domain on the dequantized transform coefficients obtained in step (2); and
(4) supplying said processed frames to a subsequent using step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Apparatus for performing a specific process on at least one coded binary stream organized in the form of frames created from digital audio signals which were coded by at least an audio terminal to output processed frames to a subsequent using step, said coding of said digital audio signals including first transforming the digital audio signals from the time domain to the frequency domain in order to calculate transform coefficients, then quantizing and coding said transform coefficients according to a set of quantizers determined by selection parameters extracted from said digital audio signals, said frames including said selection parameters and the thus-coded transform coefficients, the apparatus comprising:
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(1) a first stage for obtaining said selection parameters from said frames of at least one audio stream received from said at least one terminal and for determining from said selection parameters the set of quantizers used during the quantizing step performed by said audio terminal;
(2) a second stage for partially decoding and dequantizing said frames in response to the set of quantizers determined by said first stage and for recovering the transform coefficients calculated by said audio terminal;
(3) a third stage for performing said specific process in the frequency domain on the dequantized transform coefficients obtained by said second stage for producing processed frames; and
(4) a fourth stage for supplying said frames processed by said third stage to a subsequent utilization stage. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification