Title:
HIGH EFFICIENT ENCODER AND NOISE SPECTRUM CHANGING DEVICE AND METHOD
Document Type and Number:
Japanese Patent JP3191457
Kind Code:
B2
Abstract:
PURPOSE: To obtain a satisfactory sound quality by reducing an audible noise level without changing an existing format.
CONSTITUTION: A digital audio signal from an input terminal 11 is transmitted through one block delay 17 to a difference 20, and an output from the difference 20 is restored through a noise shaping adding circuit 21, semi-instantaneous compressor 26, semi-instantaneous expander 27, and accumulator 28, and returned to the difference 20. Then, a difference value is searched from a difference between a signal before one sample and the signal of the present sample. In the nose shaping adding circuit 21, the quantized noise spectrum is changed while an audible characteristic such as a loudness characteristic or a masking characteristic are considered, so that the audible quantized noise level can be reduced.
Inventors:
Kenzo Akagiri
Makoto Akune
Makoto Akune
Application Number:
JP31626692A
Publication Date:
July 23, 2001
Filing Date:
October 31, 1992
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G10L21/0208; G10L19/00; H03G7/00; H03M7/30; H04B1/66; H04B14/04; H04R3/04; (IPC1-7): H04B14/04; G10L19/00; H03M7/30
Domestic Patent References:
| JP6316718A | ||||
| JP472909A | ||||
| JP61158219A | ||||
| JP61158218A |
Attorney, Agent or Firm:
Akira Koike (2 outside)
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