Sanyo Electric Co., Ltd.

Takenori Ugari

Hideji Kawasaki

Hiroomi Kashu

Shuji Otsuka

Yoichi Yano

A portable telephone of the present invention comprises a casing, a LCDand a key input devicedisposed on a surface of the casing. The casing has a microphonefor delivering speech, a speakerfor receiving speech, a backlightfor lighting a screen of the LCD, a key light devicefor lighting a manipulation surface of the key input device, and a control circuitincorporated therein. The control circuitchecks whether a speech delivery signal input from the microphoneis a voice signal. If the speech delivery signal is a voice signal, display operation of the LCDis set to OFF and both the backlightand the key light deviceare turned off. If the signal is not a voice signal, display operation of the LCDis set to ON. Consequently, useless power consumption is reduced.

Portable telephone

A distortion reducing circuit in an FM receiver comprises a distortion detector for receiving the output of an FM demodulating circuit. The distortion detector comprises a high pass filter, the output of which is applied to a capacitor so that the same is rapidly charged. The conduction of the transistor is changed as a function of the charge voltage across the capacitor and a high frequency component in the output of the FM demodulating circuit is reduced in association with the conduction of the transistor.

Growing community of inventors

Hirakata, Japan

Takenori Ugari