Method and apparatus for noise burst detection in a signal proce

Details Method and apparatus for noise burst detection in a signal proce Method and apparatus for noise burst detection in a signal proce

1993-07-12

1994-05-31

Harvey, Jack B.

Boots, shoes, and leggings

375 76, 375104, 375 27, 375 34, 364517, H04B 1406

Patent

active

053175220

ABSTRACT:
A signal processor such as an ADPCM decoder (128b) receives an input signal. As part of the CCITT Recommendation G.726 algorithm, an inverse adaptive quantizer (41) processes the input signal to provide a quantized difference signal d.sub.q (k). When enabled, a noise detector (50) samples signal d.sub.q (k) once for each of a predetermined number of received samples. The noise detector (50) adds the absolute value of signal d.sub.q (k) to a total energy estimate. At the end of the predetermined number of samples, the noise detector (50) compares the total energy estimate to a product of a noise threshold and the predetermined number. If the total energy estimate exceeds this product, then a noise indication is provided. In another embodiment (228b) a noise detector (250) compares an existing energy estimate signal d.sub.ml (k) computed by an adaptation speed control block (48) as part of the G.726 algorithm to an energy threshold to save processing time.

REFERENCES:
patent: 4684989 (1987-08-01), Roeder et al.
patent: 5161185 (1992-11-01), Hochschild
Nakamura, et al.; "Improved ADPCM Voice Transmission for TDMA-TDD Systems"; IEEE Proceedings of Vehicular Technology Conf. '93; pp. 301-304 (May 18-20, 1993).
Peter Dent; "CT2 Error rate detection within the ADPCM algorithm"; IEEE Colloquium on Speech Coding-Techniques and Applications in London, UK; pp. 211-215 (1992).

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