Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: Dick Jackson Newsgroups: comp.dcom.telecom Subject: 7kHz Voice and ISDN Message-ID: <1933@accuvax.nwu.edu> Date: 7 Dec 89 18:24:30 GMT Sender: news@accuvax.nwu.edu Reply-To: Dick Jackson Organization: Citicorp/TTI, Santa Monica Lines: 28 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 9, Issue 559, message 2 of 4 As I understand it, work is afoot to implement a standard for the ISDN defined 7kHz voice service, wherein audio sampled (presumably) at 16 ksamples per second is encoded (using cunning modern techniques) at the ISDN bearer channel rate (64 kbps). I envisage the appearance of "hi-fi" telephones capable of using this service. Voice would be clearer and music could be carried (with fidelity equivalent to that of a.m. radio). Further, digital technology could enable superior echo cancelling allowing speakerphone use without the "in-a-tomb" effect. Clearly, the new phones would have to be compatible with POTS phones, but Q.931 and SS7 know enough for the service to be negotiated automatically on call set-up. Such phones might become the next great consumer electronics fad, following compact discs and cellular phones. Once people heard the higher quality, they might feel they had to have one, to keep up with their yuppie friends. Any comments? From those who know how the technology is progressing? From potential owners? Oh yes, if these things caught on, they would drive the market for ISDN lines to residential as well as business premises. Just what the local carriers need! Dick Jackson