Capacity expander for telephone line

Details Capacity expander for telephone line Capacity expander for telephone line

H - Electricity

04

J

354/53, 379/66

H04J 99/00 (2009.01) H04B 1/66 (2006.01) H04Q 5/24 (2006.01)

Patent

CA 1256616

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.

517615

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