 Bias adjustment responsive to signal power |
| What is claimed is: 1. An improved base-emitter bias voltage correction arrangement for a power ... |
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| Automatic electrical power control circuit |
| A control circuit is provided for regulating the power amplification of communication signals. The ... |
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| Adaptive power control circuit |
| Accordingly, it is an object of this invention to provide an adaptive power control circuit for a ... |
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| Method and apparatus for controlling transient responses in a power amplifier |
| We claim: 1. In a power amplifier, a method for controlling transient responses, the method ... |
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| Diversity apparatus for a global positioning system antenna |
| Accordingly, it is an object of the present invention to provide a diversity apparatus for a global ... |
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| Buffer circuit |
| With a view to solve the prior art problem described above, it is an object of the present ... |
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| Technique for determining signal dispersion characteristics in communications systems |
| FIG. 1 shows a portion 100 of an illustrative enhanced National Television System Committee (NTSC) ... |
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| Phase logic demodulator |
| In accordance with the present invention there is provided a phase logic demodulator for a phase-... |
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| Spectrum shaping microwave digital modulators |
| Turning to FIG. 1, a block diagram of a typical prior art signal transmission circuit is shown for ... |
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| PSK modulator with noncollapsable output for use with a PLL power amplifier |
| The present invention pertains to a PSK modulator for use with either wideband power amplifier up ... |
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Tone control circuit
| Details |
Inventors: Moskowitz, Jacob F.;
Assignee: Massachusetts Institute of Technology (Cambridge, MA)
Primary Examiner: Witkowski; Stanley J.
Assistant Examiner:
Attorney, Agent or Firm: Smith, Jr.; Arthur A., Santa; Martin M.
A tone control circuit using only one potentiometer to provide bass or treble control is described. An integrator and a differentiator are connected to the input of the circuit and their outputs to the two ends of the potentiometer. Electrical connection between the potentiometer and the input is also made to provide a flat frequency characteristic component in the output signal. |
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DETAILED DESCRIPTION What is claimed is: 1.
An electronic tone control circuit comprising, an integrator circuit having an input terminal and an output terminal, a differentiator circuit having an input terminal and an output terminal, first means for electrically connecting the input terminals of said integrator circuit and differentiator circuit to each other to provide the tone control circuit input terminal, a potentiometer having end terminals, a wiper arm terminal, and a center-tap terminal, second means for electrically connecting the output terminals of said integrator circuit and said differentiator circuit to said potentiometer end terminals, respectively; the wiper arm terminal providing the output terminal of said tone control circuit, third means for electrically connecting said center-tap terminal of the potentiometer to the control circuit input terminal.
2.
The tone control circuit of claim 1 wherein said second means for electrically connecting comprises, a first resistor connected between the output terminal of said differentiator circuit and one end of said potentiometer, a second resistor connected between the output terminal of said integrator circuit and the other end of said potentiometer.
3.
The circuit of claim 2 wherein, said third means for electrically connecting comprises a direct electrical connection between said tone control circuit input and said center-tap connection.
4.
An electronic tone control circuit comprising, an integrator circuit having an input terminal and an output terminal, a differentiator circuit having an input terminal and an output terminal, first means for electrically connecting the input terminals of said integrator circuit and differentiator circuit to each other to provide the tone control circuit input, a potentiometer having end terminals and a wiper arm terminal, second means for electrically connecting the output terminals of said integrator circuit and said differentiator circuit to said potentiometer end terminals, respectively; the wiper arm terminal providing the output terminal of said control circuit, impedance means electrically connecting said tone control circuit output terminal to the tone control circuit input terminal
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Audio Signal Processing 
