4. Amplifiers
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Audio signal processing system and method

Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate

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Audio signal processor

Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent

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Audio signal switching system

Amplifiers – Combined with automatic amplifier disabling switch means
Patent

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Audio signal transmission system with noise suppression network

Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent

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Audio system and processing method of storing and...

Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate

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Audio system with orderly shutdown sequence

Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent

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Audio system with transient tracking dual voltage power supply

Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent

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Audio transient suppression circuits and methods

Amplifiers – Combined with automatic amplifier disabling switch means
Reexamination Certificate

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Audio transient suppression device

Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent

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Audio volume level control

Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent

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Audio-amplifier arrangement

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent

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Audio-frequency amplifying device

Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent

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Audio-frequency power amplifier

Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent

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Audio-frequency power amplifier

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent

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Audio-frequency power amplifier that utilizes a bridged...

Amplifiers – Sum and difference amplifiers
Reexamination Certificate

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Audio-frequency power amplifiers

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent

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Auto bias circuit for power amplifier using power MOSFET

Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Reexamination Certificate

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Auto gain control circuit

Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate

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Auto gain control circuit

Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate

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Auto gain controller

Amplifiers – Signal feedback – Variable impedance in feedback path varied by separate...
Reexamination Certificate

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