 Tapered channel modular main frame |
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| Reclosable flexible bag |
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| Dual use product or shipping label |
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Receiver with adjustable squelch
| Details |
Inventors: Holecek, C. Lloyd;
Assignee: Rockwell International Corporation (El Segundo, CA)
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Hearn; Robert
Attorney, Agent or Firm: Blackwood; Terry M., Crawford; Robert J.
A radio receiver having adjustable squelch means and including demodulator means, intelligence processing means including gating means, and squelch circuit means for controlling the gating means. The squelch circuit includes voltage dividing means which controls the amplitude of a squelch drive signal and/or a reference signal. Squelch control adjustment means provides variable resistance paths around each of the divider network resistive elements. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A receiver incorporating the principles of the present invention, and in addition representing the presently preferred embodiment is shown in the figure.
Since the embodiment bears many similarities to a receiver described in U.
S.
Pat.
No.
3,188,571 assigned to the assignee of the present invention, the following description will set forth only a brief summary of the well-known and understood receiver portions.
Briefly, then, an incoming signal 11 is fed through signal demodulator means 13 including a receiver front end 15 and a detector 17.
An AGC system 19 employs part of detector output signal 21 to derive a feedback signal to control the gain of an amplifier or amplifiers in front end 15.
Front end 15 preferably comprises an RF amplifier, a mixer, an oscillator and an IF amplifier.
The detector 17 is usually a diode type AM detector.
Other choices, appropriate for the type of signal being received, will be apparent to those skilled in the art; what is important is that the demodulator recover the intelligence originally impressed on the RF carrier.
In the preferred embodiment, the recovered intelligence is an audio frequency waveform and the demodulator output 23 is connected to an audio channel containing two audio amplifiers 25 and 27, and a speaker or headset 28.
Gating means 29 is also included in the audio channel and preferably comprises a FET analog switch in series with the audio channel which is switched to its "off" mode by the application of a negative control voltage and prevents transmission of the audio to amplifier 27 and speaker 28.
Alternatively, the switch may be an integral part of audio amplifier 27 such that the "off" mode is achieved by using a control voltage of appropriate polarity to remove bias current from audio output transistors.
Other satisfactory gating circuits will be apparent to those skilled in the art.
Connected between the demodulator output 23 and the squelch gate 29 is a squelch circuit including a high-pass filter 31, a potentiometer 33, a noise amplifier 35, a noise detector 37, and control signal generating means 39
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