Digital portable telephone apparatus with holding function and h

Details Digital portable telephone apparatus with holding function and h Digital portable telephone apparatus with holding function and h

1994-07-12

1996-04-23

Faile, Andrew I.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 89, 379 63, H04B 138

Patent

active

055112374

ABSTRACT:
A digital portable telephone apparatus with a holding function normally has a VOX function and previously notifies, when absence of sound is detected in a sound presence condition, transmission power off of the talking channel by way of a postamble signal. The postamble signal is sent out periodically during a sound absence period and includes mobile station background noise generation information. Holding tone data which are the same data in successive sound sampling times are incorporated into the background noise generation information, and a resulted signal is transmitted. Accordingly, the transmission time of holding tone may be intermittent, and the transmission power can be saved.

REFERENCES:
patent: 5008954 (1991-04-01), Oppendahl
patent: 5327461 (1994-07-01), Kushige
"Digital Cellular Telecommunication System, RCR Standard, RCR STD-27B", Research & Development Center for Radio Systems, Apr. 30, 1991, pp. 99-101 .

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