Duplex voice communication radio transmitter-receiver
    1.
    发明授权
    Duplex voice communication radio transmitter-receiver 失效
    双工语音通信无线电发射机 - 接收机

    公开(公告)号:US5490167A

    公开(公告)日:1996-02-06

    申请号:US671821

    申请日:1991-03-28

    CPC分类号: H04B1/56 H04B1/662

    摘要: A duplex voice communication radio transmitter-receiver according to the present invention is provided with a low-pass filter arranged before a time compressing device in a transmitter section for cutting off a higher frequency portion of the band of a voice signal thus to decreasing the maximum modulation frequency of the same to less than a half so that it can be operated with the use of an assigned, single frequency transmission radio wave of which frequency band is legally limited, improved in the utilization of frequencies, minimized in the delay of communication signals, and enhanced in the articulation and intelligibility of a reproduced voice sound.

    摘要翻译: PCT No.PCT / JP90 / 01014 Sec。 371日期1991年3月28日 102(e)1991年3月28日PCT PCT 1990年8月8日PCT公布。 出版物WO91 / 02414 日本1991年2月21日。根据本发明的双工语音通信无线电发射机 - 接收机具有布置在发射机部分中的时间压缩装置之前的低通滤波器,用于切断频带的较高频率部分 语音信号从而将其最大调制频率降低到小于一半,使得其可以使用被规定的单频发射无线电波进行操作,频率在法律上受限制,频率的利用得到改善, 在通信信号的延迟中最小化,并且增强了再现的语音的清晰度和清晰度。