Process for compressing data relative to voice signals and devic

Details Process for compressing data relative to voice signals and devic Process for compressing data relative to voice signals and devic

1978-11-29

1980-08-05

Morrison, Malcolm A.

179 15A, G10L 100

Patent

active

042163544

ABSTRACT:
A voice signal is transmitted digitally at reduced bit rate by use of data compression. The original frequency components of a telephone band width of the voice signal sampled at 8 KHz and quantized with 12 bits are transformed into three parameters: SIGNAL data representing adaptive quantization for lower frequency (300-800 Hz) sub-bands; COEF data representing pre-emphasized parcor type coefficients for the higher frequency (800-3000 Hz) band; and, ENERGY data representing higher frequency short term energy level. The three parameters are multiplexed for transmission in binary-code form, thereby representing a recoding of the original binary-coded voice signals.

REFERENCES:
patent: 2949505 (1960-08-01), Kretzmer
patent: 3952164 (1976-04-01), David et al.

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