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    • 12. 发明授权
    • Pitch control apparatus for sound reproducing system
    • 用于声音再现系统的音调控制装置
    • US5572377A
    • 1996-11-05
    • US377821
    • 1995-01-25
    • Noriyuki Ueno
    • Noriyuki Ueno
    • G11B15/18G11B20/10G11B27/00G11B27/36G11B7/00
    • G11B20/10527G11B15/1875G11B27/005G11B2220/90
    • In a recording medium playback device, such as a tape recorder, the playback speed is changed from the speed used during recording but the sounds and voices being reproduced can be listened to at the normal pitch, as if the playback tape speed was the same as the recording speed. A frequency generator (FG) system is not required and the playback signal is converted in pitch based on a capstan motor drive signal that is converted to a voltage value and that controls a pitch converting circuit. Alternatively, the pitch converting circuit is controlled by a signal derived from a speed control system, whereby the capstan motor speed is controlled by the user of the tape recorder. By converting the pitch of the playback signal in this way a recording of a conference, for example, can be scanned at high speed yet the reproduced voices are provided with a normal pitch.
    • 在诸如磁带录音机之类的记录介质重放设备中,重放速度从记录期间使用的速度改变,但是可以以正常音调来聆听正在再现的声音和声音,就好像重放磁带速度与 录音速度。 不需要频率发生器(FG)系统,并且基于被转换为电压值并且控制音调转换电路的主导轴电动机驱动信号来转换播放信号。 或者,音调转换电路由来自速度控制系统的信号控制,由此主导轴电动机速度由磁带录音机的用户控制。 通过以这种方式转换播放信号的音调,例如可以高速扫描会议的记录,而再现的声音被提供有正常的音调。