Voice operated switch
First Claim
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1. A voice operated switch for opening and closing a circuit comprising:
- a first input for receiving signals derived from speech;
a second input for receiving signals derived from noise;
independent amplifiers for amplifying said speech signals from said first input and said noise signals from said second input;
differential amplifier means for amplifying the difference between said speech and noise signals and for producing an output signal corresponding to said difference;
first detector means for generating a control pulse when said output signal is rising;
second detector means for generating a control pulse when said output signal is falling; and
switch means for opening and closing said circuit in response to the control pulses from said first and second detector means.
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Abstract
A voice operated switch for use in noisy environments is described. The switch includes independent amplifiers for separately amplifying frequency band limited speech and noise signals. The independently amplified speech and noise signals are rectified, applied through time constant circuits, and are applied to a differential amplifier. Variations in the resulting signal are detected to determine the present or absence of speech, and control pulses are generated. The control pulses operate a switch device.
77 Citations
7 Claims
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1. A voice operated switch for opening and closing a circuit comprising:
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a first input for receiving signals derived from speech; a second input for receiving signals derived from noise; independent amplifiers for amplifying said speech signals from said first input and said noise signals from said second input; differential amplifier means for amplifying the difference between said speech and noise signals and for producing an output signal corresponding to said difference; first detector means for generating a control pulse when said output signal is rising; second detector means for generating a control pulse when said output signal is falling; and switch means for opening and closing said circuit in response to the control pulses from said first and second detector means. - View Dependent Claims (2, 3)
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4. A voice operated switch for use in loudspeaking telephone apparatus, said apparatus including a speech microphone, a noise microphone, and a receiving channel for receiving signals from a distant source, said switch comprising:
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an independent speech amplifier for amplifying speech signals from said speech microphone; an independent noise amplifier for amplifying noise signals from said noise microphone; differential amplifier means for amplifying the difference between said speech and noise signals and for producing an output signal corresponding to said difference; first detector means for generating a set control pulse when said output signal is rising; second detector means for generating a set control pulse when said output signal is falling; switch means for closing a transmitting circuit in response to set control pulses from said first and second detector means; a receiving amplifier for amplifying a received signal; and third detector means for generating a reset control pulse when said received signal is rising, said switch means being adapted to open said transmission circuit in response to a reset control pulse from said third detector means. - View Dependent Claims (5, 6, 7)
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Specification