Method of insertion of noise and apparatus thereof

Details Method of insertion of noise and apparatus thereof Method of insertion of noise and apparatus thereof

1995-12-14

1997-10-21

Kuntz, Curtis

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

375296, 395 235, H04B 1500

Patent

active

056804695

ABSTRACT:
Improvements of a method and apparatus for insertion of a pseudo noise into a silent period between an audible period and a next audible period in digital audio communication between a transmitter 10 and a receiver 11. In the transmitter 10, level measuring circuit 1 measures the level of an incoming audio signal, and comparator 2 compares the measured level value with a predetermined reference value and outputs a binary signal representing an audio period or a silent period. First selector 4 selects, in an audio period, the input audio signal 21 but selects, in a silent period, the input audio signal 21 in a lower level, and outputs the selected signal as transmission data 22. First delay circuit 3 delays the output of comparator 2 by one word interval and outputs the delayed signal as a data enable signal 23 . In the receiver, holding circuit 5 holds reception data 25 at each time when the enable signal 23 turns to a silent period, and attenuator 7 adjusts the level of a noise signal generated by noise generator 6 to a predetermined pseudo noise level corresponding to the level held in holding circuit 5. Second selector 9 outputs the reception data delayed by a one word interval by second delay circuit 8 or the pseudo noise signal corresponding, to data enable signal 23.

REFERENCES:
patent: 3735048 (1973-05-01), Tomsa et al.
patent: 3995115 (1976-11-01), Kelly
patent: 5060269 (1991-10-01), Zinser
patent: 5436899 (1995-07-01), Fujino et al.
patent: 5533133 (1996-07-01), Lamkin et al.
patent: 5539858 (1996-07-01), Sasaki et al.
patent: 5559832 (1996-09-01), Laird

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