Audio coder

Details Audio coder Audio coder

1994-12-21

1996-09-10

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Differential

375240, 375243, 375245, 395 238, 395 239, 395 291, 395 292, 395 294, 395 295, H04B 1404, H04B 1406, G10L 302, G10L 900

Patent

active

055552730

ABSTRACT:
Quantizing section 1 input audio signal data with a quantizing step width. First predicting section 14 predicts a quantization step width to be supplied to the quantizing section on the basis of the input audio signal and a number of bits of quantized data. Second predicting section 15 predicts the quantization step width on the basis of the input audio signal and a number of bits of quantized data. Coding section 2 performs Huffman coding on the quantized data. Calculating section 3 calculates the number of bits per unit time of the coded sequence signal. Selecting section 16 selects either one of the first and second predicting sections 14 and 15 on the basis of the input audio signal and the number of bits of quantized data. The first predicting section 14 further predicts another wider quantizing step width by a predetermined step width when the number of bits calculated is exceeded a predetermined value B. The selecting section 16 selects the first predicting section 14 when the number of bits calculated by the calculating section 3 is exceeded a predetermined value B but is not exceeded a threshold value N and selects the first predicting section 15 when the number of bits calculated by the calculating section 3 is exceeded a predetermined value and a threshold value N.

REFERENCES:
patent: 5084904 (1992-01-01), Daito
patent: 5089818 (1992-02-01), Mahieux
patent: 5091955 (1992-02-01), Iseda
patent: 5113448 (1992-05-01), Nomura
patent: 5115469 (1992-05-01), Taniguchi
patent: 5285498 (1994-02-01), Johnston
patent: 5353375 (1994-10-01), Goto

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