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

1995-05-08

1998-05-26

Kuntz, Curtis

Electrical audio signal processing systems and devices

Including frequency control

381106, 375243, 375346, 375350, 395 235, 395 236, 395 238, 395 239, H03G 500

Patent

active

057579385

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 a 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: 5204677 (1993-04-01), Akagiri et al.
patent: 5563913 (1996-10-01), Akagiri et al.

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