Method for detecting the quantization of spectra

Details Method for detecting the quantization of spectra Method for detecting the quantization of spectra

2008-01-08

2008-01-08

Lerner, Martin (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S230000, C704S501000

Reexamination Certificate

active

10497734

ABSTRACT:
The invention comprises the retrieval of a quantized spectrum of audio-data, which had been compressed conforming to psychoacoustic principles. This spectrum can be identified with the aid of sorted (and logarithmized) differences of the magnitude of the amplitude. A problem to be solved by the invention is to find the basis of sensitive indicators for the degree of quantization of a spectrum. The result of this calculation shows for a quantized spectrum several small values at amplitudes of the same quantization level, and obvious spikes at positions, where the amplitudes have reached a higher level of quantization, while a non-quantized spectrum typically resembles noise.

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Keyhl et al., “The effect of low bit-rate coding upon impaired audio material”, International Broadcasting Convention, 1995, IBC 95, Sep. 14-18, 1995, pp. 151 to 158.
Search Report Dated Mar. 10, 2003.

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