Speech coding method and device for implementing the improved me

Details Speech coding method and device for implementing the improved me Speech coding method and device for implementing the improved me

1982-04-20

1984-08-07

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

375122, 340347DD, G10L 100, H04B 166

Patent

active

044647832

ABSTRACT:
This improved speech signal Block Coded PCM (BCPCM) system reduces the number of bits allocated to transmitting the scale factor, thereby releasing bits for allocation to coding samples in the associated block of samples. The scale factor (c) is calculated for every 16 millisecond block of samples. However, the scale factor will be transmitted only once per 32 millisecond block if there is no significant difference between the two sequential values. The original speech signal is split into 16 frequency subbands, each subband initials sampled and 12-bit coded, then requantized in BCPCM at dynamically variable bit rates depending on the scale factor transmission rate.

REFERENCES:
patent: 4184049 (1980-01-01), Crochiere et al.
patent: 4191858 (1980-03-01), Araseki
patent: 4216354 (1980-08-01), Esteban et al.

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