SELECTIVE CALL RECEIVER
PURPOSE:To always execute a call with a proper alarm sound volume by controlling the alarm sound volume according to a surrounding environmental noise level in a selection call receiver receiving a selected call signal and generating an alarm sound. CONSTITUTION:An AMP 1 receives an alarm signal fro...
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Zusammenfassung: | PURPOSE:To always execute a call with a proper alarm sound volume by controlling the alarm sound volume according to a surrounding environmental noise level in a selection call receiver receiving a selected call signal and generating an alarm sound. CONSTITUTION:An AMP 1 receives an alarm signal from the selection call circuit of the receiver, and the output is transmitted through a changeover switch SW to a loudspeaker SP. The other side contact of the switch SW is connected so as to input the signal from the loudspeaker SP to a control circuit CONT, and simultaneously, a constitution is so made that the amplification degree of the amplifier AMP 1 can be increased/decreased by the output of the circuit CONT. Thus, when the switch SW is switched to the circuit CONT side, the output from the loudspeaker SP to work as a microphone is conducted to the circuit CONT, the alarm sound volume is adjusted by increasing the amplification degree of the amplifier AMP 1 when a surrounding environmental noise is large and by decreasing the amplification degree of the amplifier AMP 1 when the noise is small, and the alarm sound is made into a proper informing alarm sound. |
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