Portable telephone apparatus

Details Portable telephone apparatus Portable telephone apparatus

1998-05-21

2000-11-28

Woo, Stella

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379433, 455575, H04M 1100

Patent

active

061545384

ABSTRACT:
When the portable telephone apparatus receives a termination call and a call signal (or a ringing signal), the speaker generates a ringing tone. At this point, the user hears the ringing tone and holds the ear piece to his or her ear. At this point, the speaker impedance variation detecting portion detects the variation of the impedance corresponding to the variation of the volume of the space between the speaker and the ear piece. When the impedance variation detecting portion detects the variation of the impedance, it outputs an impedance variation detection signal. When the controlling portion receives the impedance variation detection signal, it performs a response process for the termination call or a hold cancel process for a call.

REFERENCES:
patent: 5884156 (1999-06-01), Gordon
patent: 5918188 (1999-06-01), Doran
patent: 5956398 (1999-09-01), Weadon et al.

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