Sound input and output device having function of preventing bad voice

Application Number: 00108685
Application Date: 2000.05.16
Publication Number: 1323712
Publication Date: 2001.11.28
Priority Information:
International: B60R11/02;H04R9/10
Applicant(s) Name: Hatakeyama Mfg. Co., Ltd.
Inventor(s) Name: Muramatsu Kenji
Patent Agency Code: 31100
Patent Agent: sun jingguo
Abstract A sound input and outer device having the function of preventing whistle noise includes a card type advantar, a card type tape putting device capable of output sound to loud speaker, magnet head for transmitting sound output to sound reprodn. heat of card type tape putting device, a microphone, a sound output and input circuit, a main part, switch used for turning-on or off the signal receiver of mobile telephone, a connecting wire, a telephone receiver connected to the mobile telephone main part. speaking trumpet plug etc. The present invention possesses circuit for preventing whistle noise.