Method for binary coding of quantization indices of a signal envelope, method for decoding a signal envelope and corresponding coding and decoding modules
A technology of binary coding and signal envelope, applied in the field of audio signal transform coding and binary coding module
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[0067] The invention is described in the context of a specific type of hierarchical audio coder operating at 8 kbit / s to 32 kbit / s. However, it must be clearly understood that the methods and modules for binary encoding and decoding of spectral envelopes according to the invention are not limited to this type of encoder and can be applied to any form of Spectral Envelope Binary Encoding.
[0068] As shown in Figure 4, the input signal of the wideband hierarchical encoder sampled at 16kHz is first divided into two subbands by a quadratic image filter (QMF). The low frequency band from 0 to 4000 Hz is obtained by low pass filtering 300 and decimation 301 , and the high frequency band from 4000 to 8000 Hz is obtained by high pass filtering 302 and decimation 303 . In a preferred embodiment, filter 300 and filter 302 have length 64 and are described in the following paper: J. Johnston, "A filter family designed for use in quadrature mirror filter banks", ICASSP, vol.5, pp.291- 2...
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