Patent ID: 7313150
Filing Date: 2007-12-25
Classification: H04M,H04N

Abstract:
1. A relay node for coupling terminals to a digital data packet telecommunications network, said relay node comprising: means for determining a type of signal coming from a terminal coupled to the relay node, from amongst a plurality of signal types, and a plurality of relay means for processing said type of said signal, and controlled by the means for determining, to apply to each said signal a form of relay processing corresponding to the type of said signal, wherein the means for determining comprises: two band-pass filters centered on the frequencies 2100 Hz and 1100 Hz, respectively, that receive the signal for which said type is to be determined; a device for discriminating between a 2100 Hz tone, a 1100 Hz tone, silence or other signal, said device for discriminating being coupled to outputs of the two band-pass filters; a signal analyzer coupled to the discriminator device to determine if a tone pulse has a duration in an interval and to analyze a 2100 Hz tone to detect a presence or an absence of amplitude modulation at 15 Hz and phase jumps of ±180°; and a decision device for choosing the type of the signal as a function of the amplitude of the signal at the output of each of the filters and the result of the analysis of signals by the signal analyzer.