Title:
PRESS-TO-TALK COMMUNICATION CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP3444251
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a press-to-talk communication control system capable of evading the collision of communication by simple constitution.
SOLUTION: The timer circuit of an earth station device 101 starts timing in response to transmission permission signals 201 generated by the operation of a press-to-talk microphone 110 and outputs reference timing signals 203. Simultaneously, a carrier control circuit 105 outputs carrier control signals 204 in response to the transmission permission signals 201. Thus, a carrier is outputted from a modulator 102. The carrier control circuit 105 stops the transmission of the carrier when reception synchronization signals 209 are received at the time other than prescribed time based on the reception synchronization signals 209 from a demodulator 103 and the reference timing signals 203.
Inventors:
Kenichiro Yagawa
Application Number:
JP33017299A
Publication Date:
September 08, 2003
Filing Date:
November 19, 1999
Export Citation:
Assignee:
NEC
International Classes:
H04B1/04; H04B1/38; H04B7/185; H04B7/24; H04B17/345; H04W4/10; H04W56/00; H04W84/06; H04W88/02; (IPC1-7): H04B7/185; H04B1/38
Domestic Patent References:
| JP9182140A | ||||
| JP1146176A | ||||
| JP7107028A | ||||
| JP613931A | ||||
| JP7154856A | ||||
| JP6051035A | ||||
| JP1149532A |
Attorney, Agent or Firm:
Masahiko Desk (2 outside)