Products		Technologies		About us		Contact
DSP - technologies for signal processors Telephony modems family DTMF multichannel transivers Parallel radio modems Narrow bandwith Vocoders 1200 - 2400 bit/s) DSP - technologies for programmable devices Telecommunication modules in programmable devices Embedded applications	Multichannel DTMF transceiver Multichannel DTMF transceiver has been implemented as software on signal processor TMS320VC33. It is capable of simultaneously handling 30 acoustic channels (for 120MHz clock). DTMF receiver implements mulitcriterial decision algorithm, based on spectrum anlysis, effectivly eliminating false detections (useful in detecting DTMF in voice signal). Examples Gateway IP-ISDN, Gateway DSTG     Multichannel DTMF transceiver has been implemented in both Gateway IP-ISDN and Gateway DSTG , for receiving phone numbers, sent in previously set up voice channels. Spectrums from DTMF transmitter  Digits 0…9 and characters * i #