Title:
【発明の名称】無線通信システム用デ-タミユ-テイング方法および装置
Document Type and Number:
Japanese Patent JPS58501980
Kind Code:
A
Abstract:
Data muting apparatus is described that mutes variable-length data signals communicated between a central station and mobile and portable radios in a dispatch radio communications system. The central station includes a base station transceiver, a dispatcher console, a general communications controller (GCC), a digital communications computer and a display terminal. The base station transmitter and receiver communicate over an RF duplex channel to the transceiver of the mobile and portable radios. The dispatcher console provides for voice communications and is coupled by a transmit signal line and a receive signal line to the base station transceiver. The GCC provides for data communications and is also coupled to the transmit signal line and is interposed between the dispatcher console and the base station transceiver in the receive signal line. The GCC and mobile and portable radios include data muting apparatus enbodying the present invention. The data muting apparatus includes a detector for detecting the presence of a carrier signal and muting circuitry for muting the transceiver output for a predetermined time interval when a carrier signal has been detected. During the predetermined time interval, other circuitry may detect a synchronization word in a received data signal and mute the receiver output until still other circuitry detects the last bit of a following information word in the received data signal and unmutes the transceiver output. Thus, data signals at the beginning of each communication are muted without impairing voice communications.
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Inventors:
Miraca-William
Free Bag Thomas
Stephen Michael
Free Bag Thomas
Stephen Michael
Application Number:
JP50008883A
Publication Date:
November 17, 1983
Filing Date:
November 12, 1982
Export Citation:
Assignee:
Motro-La Inco-Pole-Ted
International Classes:
H03G3/34; H04B7/26; H04J3/24; H04B1/10; (IPC1-7): H04B1/10; H04J6/00
Attorney, Agent or Firm:
Kugoro Tamamushi