Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-06-04
2000-03-28
Bost, Dwayne D.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455550, H04Q 732
Patent
active
060442794
ABSTRACT:
A portable electronic apparatus having an adjustable ringing tone volume, a light receiving element 4 for detecting external light and a control circuit 3 for controlling he tone volume in response to light detection by the light receiving element 4. When the light receiving element 4 detects light as the power supply is turned on, or a specified key arranged on the external face of the housing is pressed down, the control circuit 3 causes a loudspeaker 7 to sound a test tone, picks up its echo with a microphone 5, and stores the volume of the echo into a memory 6 as a reference volume level. The control circuit 3, when notified of the arrival of a call by a transmitter/receiver circuit 2, causes the loudspeaker 7 to sound a test tone unless the light receiving element 4 detects light, picks up its echo with the microphone 5, and compares the volume of the echo with the reference volume level stored in the memory 6. The control circuit 3, if it finds the volume of the echo greater than the reference volume, will increase the volume of the ringing tone from the loudspeaker 7. The control circuit 3, when detecting a change in ambient light (by the light receiving element 4), switches the means of notice of call arrival from the sounding of the ringing tone by the loudspeaker 7 to intermittent lighting by an LED 8.
REFERENCES:
patent: 5131030 (1992-07-01), Cameron
patent: 5703931 (1997-12-01), Martensson
patent: 5771297 (1998-06-01), Richardson
patent: 5809411 (1998-09-01), Kudoh et al.
patent: 5842139 (1998-11-01), Muramatsu et al.
Hokao Tomoaki
Ohsuge Michihiro
Bost Dwayne D.
NEC Corporation
Trost William G.
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