×

Transmission process and device for implementing the so-improved process

  • US 4,464,782 A
  • Filed: 02/08/1982
  • Issued: 08/07/1984
  • Est. Priority Date: 02/27/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of transmitting a voice signal, the spectrum of which extends within a given frequency band, said method including the following steps:

  • at the transmitter;

    sampling said voice signal;

    digitally coding the sample stream at a relatively high bit rate;

    filtering the digitally-coded signal into p frequency sub-bands;

    dividing the sample stream of the p sub-band filtered signals into consecutive blocks of samples of a given time duration;

    sequentially requantizing each of said blocks, said requantizing including a dynamic allocation of the bits allocated to the requantizing of the samples of the voice signal of each of said sub-bands, and including for the processing of each of the blocks to be requantized, the following operations;

    determining requantizing parameters of the sub-band, for each of said sub-bands, from the energy of the voice signal within said sub-band derived from the filtering and dividing operation of a given block of samples;

    quasi simultaneous requantizing the samples, upon said parameter determination, which samples are contained in each sub-band and derived from said given block of samples, using the requantizing parameters determined from the previous block of samples in the same sub-bands; and

    ,transmitting in multiplex format the requantized signal samples over the p sub-bands together with requantizing parameters, for each block of samples.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×