Patent ID: 6092222
Filing Date: 2000-07-18
Classification: H04B,H04W

Abstract:
A data transmission method in a system employing information channels having at least two different capacities, on which channels speech is transmitted by at least two different coding techniques in such a manner that on a channel having a higher capacity, fewer symbols to be transmitted are coded from the same speech signal block than on a channel having a lower capacity, the method comprising:speech coding a signal transmitted on at least one channel having a lower capacity according to a channel of a higher capacity;performing channel coding on the speech coded data in such a manner that the obtained number of symbols corresponds to the channel of the lower capacity;dividing the speech signal block into three parts which comprise 73, 22 and 17 symbols, respectively;adding three error correction symbols to the 22-symbol part;combining the first two parts and adding five know tail symbols thereto;convolution coding the 103 symbols obtained in this manner with and an efficiency ratio of 1/4;adding five known tail symbols to the posterior 17-symbol part; andconvolution coding the 22 symbols obtained in this manner with an efficiency ratio of 1/2,wherein the speech coded data is a data block of 112 symbols.