DC decoupled radio communication system
First Claim
1. A radio communication system comprising:
- a radio unit including a transmitter circuit, a receiver circuit and selecting means for selecting either one of said transmitter and receiver circuits for operation;
a microphone unit;
a data communication unit; and
an interface circuit including a d.c. decoupling means having a first side operatively coupled to said transmitter and receiver circuits and a second side which is d.c. decoupled from said first side to prevent the passing of noise, a first switching means selectively connecting said second side to one of said microphone unit and said data communication unit, and a second switching means for selectively switching between a transmission mode and a reception mode and thus supplying a mode select signal to said selecting means.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio communication system includes a radio unit, an interface circuit, a microphone and a fascimile unit. The interface unit includes a transformer through which signals are transferred between the radio unit and a seelcted one of the microphone and the facsimile unit so that d.c. components of the signals cannot be transferred. The interface circuit also includes a first relay connected between one winding of the transformer and the microphone and the facsimile unit and a second relay connected between the other winding of the transformer and the radio unit. The system also includes a mode select switch which is operatively coupled to the first and second relays. Thus, mode select signals are also d.c. decoupled signals.
-
Citations
6 Claims
-
1. A radio communication system comprising:
-
a radio unit including a transmitter circuit, a receiver circuit and selecting means for selecting either one of said transmitter and receiver circuits for operation; a microphone unit; a data communication unit; and an interface circuit including a d.c. decoupling means having a first side operatively coupled to said transmitter and receiver circuits and a second side which is d.c. decoupled from said first side to prevent the passing of noise, a first switching means selectively connecting said second side to one of said microphone unit and said data communication unit, and a second switching means for selectively switching between a transmission mode and a reception mode and thus supplying a mode select signal to said selecting means. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification