| 摘要 |
<p>The invention makes it possible to transmit voice-frequency pairs from N predetermined frequencies over a speech-transmission telephone network in the form of a multiplex of binary speech frames having a specified format. To do this, a numerical code has been assigned to each voice frequency or to each frequency pair; the respective numerical codes are generated in response to a command to send a frequency pair; each numerical code is inserted into a numerical frame with the said format containing an identification word constituting an excluded grouping for the speech frames; and, on reception, the respective voice-frequency pairs are generated with the aid of the speech decoder, in response to the recognition of the said numerical codes, in synchronism with the frames containing one of the said identification words. <IMAGE></p> |
