H - Electricity – 04 – S
Patent
H - Electricity
04
S
325/73
H04S 1/00 (2006.01) H03G 3/34 (2006.01)
Patent
CA 1111499
NOISE BLANKER WITH VARIABLE RATE SHUT-OFF AND/OR VARIABLE BLANKING THRESHHOLD LEVEL ABSTRACT A noise blanker circuit for a stereo radio receiver is disclosed herein. The noise blanker circuit detects noise impulses in a received radio signal. When the magnitudes of these detected noise impulses exceed a predetermined thres- hold level corresponding noise blanking pulses are produced which are coupled to a gate means. The gate means receives the received radio signal and selectively passes and blocks this signal in response to the noise blanking pulses such that the output of the gate means is essentially free of noise impulses. A manually adjusted actuator is provided for selectively altering the predetermined threshold level of the noise blanker circuit such that the most efficient mode of noise blanking can be implemented. In addition, rate shut-off circuitry is provided to prevent the pro- duction of noise blanking pulses when the detected noise impulses occur at a repetition rate exceeding a maximum repetition rate. The manually adjustable actuator also selectively determines the value of this maximum allowable repetition rate and thereby also selectively implements the most efficient mode of noise blanking. The manually adjust- able actuator is illustrated as comprising either the tone control actuator or the stereo-monaural selection switch actuator of a radio receiver, whereby control of the noise blanker circuit is implemented without adding an additional control to the stereo radio receiver. In addition, an embodiment of the present invention illustrates the use of a stereo decoder means of the stereo radio receiver to select the predetermined threshold level and/or the maximum repetition rate of the noise blanker circuit.
307040
Duncan Herbert A.
Schmidt Ruediger
Gowling Lafleur Henderson Llp
Motorola Inc.
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