| 摘要 |
A method and apparatus for speech transmission including inband signalling, comprises a sampler 3 for digitally sampling the speech signal to product blocks of bits representing the speech signal, means 15 for providing a queue of inband signals to be transmitted with the speech signal, a detector 13 for monitoring the speech signal for periods of speech with low likelihood of degradation due to the insertion of the inband signals, and an insertion device 9 for inserting inband signals from the queue 15 into the blocks of bits representing the speech signal during the periods of speech with low likelihood of degradation. As a result, inband signals can be transmitted with a speech signal without degrading the apparent quality of the speech signal for a user of the system. The inband signals are preferably inserted into the least significant bits of the blocks, either in bursts of consecutive blocks or in 1 in N blocks. |
