Pulse or digital communications – Repeaters – Testing
Patent
1994-11-23
1997-11-04
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375241, G10L 900
Patent
active
056849222
ABSTRACT:
There is provided an encoding and decoding apparatus which can provide a high quality of reproduction of sound. There are provided an encoding section and a decoding section. A block length determining section of the encoding section time-sharingly divides an input signal into blocks having a block length corresponding to the degree of change of the input signal. A frequency band dividing section divides the signal of each block into a plurality of frequency bands. A bit allocating section obtains a masking threshold value-to-noise ratio of each frequency band from the magnitude of the power of each frequency band reflecting a psychoacoustic characteristic, and determines the number of quantization bits to be allocated to each frequency band based on the magnitude of the masking threshold value-to-noise ratio. A quantizing section generates a code string by quantizing the signal while allocating a specified amount of bits to each frequency band based on information from the bit allocating section. The bit allocating section receives information representing the block length from the block length determining section, and adopts a different psychoacoustic characteristic depending upon the block length.
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Kawama Shuichi
Miyakawa Harumitsu
Conlin David G.
Oliver Milton
Safourek Benedict V.
Sharp Kabushiki Kaisha
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