Narrow band radio transmitting and receiving apparatus and metho

Details Narrow band radio transmitting and receiving apparatus and metho Narrow band radio transmitting and receiving apparatus and metho

1995-10-03

1998-11-17

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Optimum frequency selection

455 671, H04B 1500, H04B 1700

Patent

active

058390553

ABSTRACT:
Between narrow band radio transmitting and receiving apparatuses, method and apparatus for shortening the starting failure time upon start of transmission are disclosed.
By start of transmission at the transmission side, a DTMF signal at 697 Hz to 1633 Hz is outputted from a DTMF generator, and it is changed over to a DTMF signal at 1/10 frequency 0.02 sec later and outputted.
A DTMF receiver at the reception side, when receiving a DTMF signal at 697 Hz to 1633 Hz, cancels the output mute circuit to set in service state. The DTMF receiver, when no longer receiving DTMF signal as a result of changeover to DTMF signal at 1/10 frequency, waits for an ordinary DTMF signal at 1/10 frequency, and cancels the output mute circuit until the end of transmission after reception thereof.

REFERENCES:
patent: 5392348 (1995-02-01), Park et al.
patent: 5459785 (1995-10-01), Noda
patent: 5483676 (1996-01-01), Mahany et al.
patent: 5619564 (1997-04-01), Canniff et al.

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