Telephone system digital channel bank interface

Details Telephone system digital channel bank interface Telephone system digital channel bank interface

1988-08-31

1990-02-13

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379157, 379201, 3701101, 370111, H04M 100

Patent

active

049013440

ABSTRACT:
8 kHz ASK signals are produced by an electronic business set instrument to function as control or feature signals. To avoid the problems of transmitting the 8 kHz ASK over voiceband telephone lines over long distance, the least significant bit (LSB) of each 8 bit word representative of voice signals is caused to be at a predetermined level (e.g., low) when an ASK signal is present and at the other level (e.g., high) when there is no ASK. At the receiving end, the state of the bit is used to regenerate the 8 kHz. Detection of the ASK is performed by a high-pass filter.

REFERENCES:
patent: 3748393 (1973-07-01), Baxter
patent: 4151373 (1979-04-01), Widmer et al.
patent: 4171467 (1979-10-01), Evenchik
patent: 4292474 (1981-09-01), Norrell et al.
patent: 4750173 (1988-06-01), Bluthgen
Bellamy, John, "Digital Telephony", pp. 101-102.

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