Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1995-01-31
1997-04-29
Macdonald, Allen R.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
395 239, 395 238, 381 731, 381 2, H04H 500
Patent
active
056257457
ABSTRACT:
Techniques for encoding audio signals are disclosed wherein a left channel signal masking threshold and a right channel signal masking threshold may be advantageously adjusted. A given time block of a stereo audio signal comprises a left channel signal and a right channel signal, each of which are represented in a frequency domain by a first plurality of frequency partitions and a second plurality of frequency partitions, respectively. For a frequency partition from the first plurality of frequency partitions and a corresponding frequency partition from the second plurality of frequency partitions, a scheme first calculates a set of masking thresholds comprising the left channel masking threshold and the right channel masking threshold. Next, based upon the set of masking thresholds, the scheme calculates an adjusted left channel masking threshold and an adjusted right channel masking threshold. The adjusted thresholds may be advantageously used to encode the audio signal wherein the effect of noise unmasking is reduced.
REFERENCES:
patent: 5291557 (1994-03-01), Davis et al.
Warner R. Th. ten Kate, "Compatibility Matrixing of Multi-Channel Bit-Rate-Reduced Audio Signals", Preprint 3792 from 96th Convention of Audio Engineering Society, Amsterdam Feb. 1994.
Robbert G. van der Waal and Raymond N. J. Veldhuis, "Subband Coding of Stereophonic Digital Audio Signals", Proc. ICASSP '91, pp. 3601-3604 Apr. 1991.
Mark Black, "Computationally Efficient Wavelet Packet Coding of Wide-Band Stereo Audio Signals", Proc. ICASSP '95, pp. 3075-3078 May 1995.
W.R. Th. ten Kate, P.M. Boers, A. Makivirta, J. Kuusama, K.E. Christensen, and E. Sorensen, "Matrixing of Bit Rate Reduced Audio Signals", Proc. ICASSP '92, vol. II, pp. 205-208 Mar. 1992.
Dorward Sean M.
Johnston James D.
Dinella Donald P.
Lucent Technologies - Inc.
MacDonald Allen R.
Rosenblatt David M.
Smits Talivaldis Ivars
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