Capacity expander for telephone line

Details Capacity expander for telephone line Capacity expander for telephone line

1985-09-06

1988-07-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375122, 381 29, H04J 1500, H04B 106

Patent

active

047559942

ABSTRACT:
A private telephone line expander is disclosed which receives two analog voice inputs. Both input signals are digitized, compressed using full period splicing, and converted back to analog for transmission. One is shifted to the upper half of the telephone line bandwidth. The other remains in the lower half. Both are transmitted on the same telephone line. When received both signals are expanded to normal telephone bandwidth and can be connected to two different telephones. DTMF signals are transmitted with each voice transmission.

REFERENCES:
patent: 4058676 (1977-11-01), Wilkes et al.
patent: 4110560 (1978-08-01), Leary et al.
patent: 4270025 (1981-05-01), Alsup et al.
patent: 4375013 (1983-02-01), Cointot et al.
patent: 4379949 (1983-04-01), Chen et al.
patent: 4381428 (1983-04-01), Kolesar et al.
Article entitled "A Programmable Voice Digitizer Using the T.I. TMS-320 Microcomputer", by Daniel F. Daly and L. E. Bergeron, from Proceedings, IEEE 1983 Acoustics Speech & Signal Processing, vol. 2.

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