Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent
1996-05-28
1998-06-09
Zele, Krista
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
379374, 379418, 379420, 381 71, 381164, H04M 300
Patent
active
057647518
ABSTRACT:
In a portable telephone set comprising a receiver for generating an audible tone, a vibrator for vibrating the portable telephone set mechanically, and a radio section for receiving an incoming call signal to produce a call detection signal, a transmitter microphone senses, in cooperation with a voice processing section, ambient sounds to produce an ambient sound level signal. In cooperation with a main control section, a vibrator control section selectively activates, in response to the call detection signal, one of the receiver and the vibrator with reference to the ambient sound level signal. When the level is not more than a predetermined level, the vibrator control section drive the vibrator to make the vibrator vibrate mechanically without generation of the audible tone. Otherwise, the vibrator control section makes the receiver generate the audible tone.
REFERENCES:
patent: 3665112 (1972-05-01), Blake et al.
patent: 5615256 (1997-03-01), Yamashita
patent: 5617468 (1997-04-01), Nojima et al.
patent: 5617472 (1997-04-01), Yoshida et al.
NEC Corporation
Saint-Surin Jacques M.
Zele Krista
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