Signal responsive automatic control for audio equipment
First Claim
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1. A device for automatically muting an audio signal, comprising:
- means for providing an electrical signal having at least first and second voltage levels;
means for sensing said first and said second voltage signal levels;
means operatively connectable to an audio amplifier for providing distortion free attenuation control of the audio output of said amplifier;
means operatively connected to said first and second voltage sensing means for predeterminedly operating said control means, said operating means automatically providing at least first and second attenuation control voltage signal levels in response respectively to said first and second voltage signals levels; and
means for adjusting at least one of said first and second attenuation control voltage signal levels operatively connected to said predeterminedly operating means.
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Abstract
A remote volume control apparatus for audio equipment is operated by the ringing of a telephone to slowly decrease the volume of an audio amplifier during the control'"'"'s initial operation, maintain the volume at a preselected low volume and slowly increase the volume automatically after the termination of the telephone conversation. In the preferred embodiment, a circuit active indicator also is provided for indicating both proper apparatus operation an activation of the telelphone signal. An attenuation level control also is provided in the form of a switch selector operable to enable the user to preselect a desired attenuation level.
21 Citations
13 Claims
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1. A device for automatically muting an audio signal, comprising:
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means for providing an electrical signal having at least first and second voltage levels; means for sensing said first and said second voltage signal levels; means operatively connectable to an audio amplifier for providing distortion free attenuation control of the audio output of said amplifier; means operatively connected to said first and second voltage sensing means for predeterminedly operating said control means, said operating means automatically providing at least first and second attenuation control voltage signal levels in response respectively to said first and second voltage signals levels; and means for adjusting at least one of said first and second attenuation control voltage signal levels operatively connected to said predeterminedly operating means. - View Dependent Claims (2, 3, 4)
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5. A device for automatically muting an audio signal, comprising:
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means for sensing the presence of an electrical signal having at least first and second voltage levels; means responsive to said sensed electrical signal for providing at least one control electrical signal; means for controlling the output of an audio amplifier; means operatively connected between said sensed signal responsive means and said controlling means for operating the controlling means in response to said control electrical signal, said operating means automatically providing at least first and second attenuation control levels in response respectively to said first and second voltage signal levels. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A device for automatically adjusting an audio signal, comprising:
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means for controlling the output of an audio amplifier including an electromechanical wave energy responsive device automatically operable to vary the impedance in the audio amplifier circuit reciprocally between at least first and second values; means for operating said controlling means including electromechanical wave energy generating means having an output optically coupled to said electromechanical wave energy responsive device; means for selectively adjusting the output provided by said operating means; means for generating a control signal to said operating means including means for sensing the presence of an electrical signal having at least first and second voltage levels, said first and second voltage levels being operatively applied to vary the impedance in the audio amlifier reciprocally between said first and second values; and means responsive to said control signal generating means for visually indicating the operation of said device. - View Dependent Claims (12, 13)
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Specification