System for processing audio frequency information for frequency

Details System for processing audio frequency information for frequency System for processing audio frequency information for frequency

1985-04-30

1986-03-25

Bookbinder, Marc E.

Telecommunications

Transmitter

Angle modulation

307555, 328169, 332 18, 381 94, H04B 104

Patent

active

045788189

ABSTRACT:
In FM transmitters, particularly land mobile FM transmitters, wherein a speech signal is pre-emphasized between 300 Hz and 3 kHz, whereafter it is filtered to provide a sharp cut-off and wherein the maximum peak frequency deviation is limited in order to maintain channel integrity, the level of undistorted speech can be raised to within 90% of the transmitter peak deviation by directly connecting an amplitude limiter to a filter amplifier which behaves as a level sensitive filter when the speech signal has been limited and prevents ringing and overshoot from occurring. The output from the filter amplifier is coupled to a low pass filter, typically a fourth-order Butterworth filter, via an attenuator which reduces the amplitude of the signal to prevent the onset of further clipping.

REFERENCES:
patent: 4110692 (1978-08-01), Pradal
"Combining High Signal Quality With High Modulation Levels in FM."-Eric Small et al, Orban/Broadcast, Orban Associates, San Francisco, Calif.; Broadcast Management/Engineering, Oct. 1975, p. 44.

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