High efficiency encoding device and a noise spectrum modifying d

Details High efficiency encoding device and a noise spectrum modifying d High efficiency encoding device and a noise spectrum modifying d

1993-10-28

1996-10-08

Coles, Sr., Edward L.

Pulse or digital communications

Pulse code modulation

Correcting or reducing quantizing errors

381106, H04B 1404

Patent

active

055639135

ABSTRACT:
An apparatus and method for processing an input digital signal in which an input digital audio signal at an input terminal 11 is supplied via a one-block delay unit 17 to a difference unit 20, an output of which is processed by noise-shaping circuit 21 and restored by a near-instantaneous compressor 26, a near-instantaneous expander 27 and an accumulator 28 so as to be fed back to the difference unit 20 to find a difference between a signal of a directly preceding sample and a signal of the current sample. The noise shaping circuit 21 modifies the spectrum of the quantization noise by taking aural characteristics, such as equal-loudness characteristics or masking characteristics, into account for diminishing the level of the quantization noise as perceived by the ear. The noise level as perceived may be reduced in a manner desirable for the sound quality without changing the existing format.

REFERENCES:
patent: 4292651 (1981-09-01), Kretz
patent: 4829299 (1989-05-01), Mandell
patent: 5228059 (1993-07-01), Takegahara
Patent Abstracts of Japan, vol. 12, No. 221, Jun. 23, 1988 corres. to Japanese Appln. 63-16718 (Takegahara).

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