Claims
- 1. 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; and
- convolution 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.
- 2. 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;
- convolution coding the 22 symbols obtained in this manner with an efficiency ratio of 1/2; and
- transmitting the convolution coded symbols as interleaved during eight time slots,
- wherein the speech coded data is a data block of 112 symbols.
- 3. A method for transmitting a speech signal in a system having capacity to transmit the speech signal via information channels of one of a full rate channel and a half rate channel using coders designed for the full rate channel and the half rate channel, respectively, the method comprising:
- speech coding the speech signal using the coders designed for the half rate channel;
- channel coding the speech coded signal for transmission over the full rate channel;
- transmitting the channel coded signal over the full rate channel;
- 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 known tail symbols thereto,
- convolution coding the 103 symbols obtained in this manner with an efficiency ratio of 1/4,
- adding five known tail symbols to the posterior 17-symbol part, and
- convolution 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.
Priority Claims (1)
Number |
Date |
Country |
Kind |
945962 |
Dec 1994 |
FIX |
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Parent Case Info
This application claims benefit of international application PCT/FI95/00681, filed Dec. 14, 1995.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/FI95/00681 |
12/14/1995 |
|
|
8/13/1996 |
8/13/1996 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO96/19880 |
6/27/1996 |
|
|
US Referenced Citations (14)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0 332 825 A2 |
Sep 1989 |
EPX |