A digital sound-signal broadcaster includes a control faceplate to control the rotating speed and direction of a turntable so as to operate the music data of a CD stored in a dynamic memory chip to make a variety of special sound effects to heighten atmosphere of joy, not only easy in handling and convenient...http://www.google.de/patents/US6535462?utm_source=gb-gplus-sharePatent US6535462 - Digital sound-signal broadcaster
