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4101840 |
Volume control arrangement for an electro-acoustic system
A volume control arrangement for an electro-acoustic system, said arranget having an adjustable amplification factor and a frequency characteristic dependent thereon, and comprising a frequency...
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4085365 |
Earphone adapter for aircraft radios
An adapter making it possible for the pilot of an aircraft equipped with a navigation-communication system whose audio output is permanently connected to a loudspeaker to hear well with ordinary...
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4068092 |
Voice control circuit
In a voice control circuit comprising a variable loss circuit and a voice level detector which is connected to control the variable loss circuit, there is provided a noise control circuit. The...
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4041408 |
Push-pull audio amplifier system with muting
Audio signals are equally power divided with the power divided signals being 180° out-of-phase. These separate out-of-phase signals are separately applied to the inverting input of separate...
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4027112 |
Head-rest and loudspeaker combination
A body of foam substance forming a head-rest, for example a head restraint for an automobile seat, an aircraft seat, or the like, provides a housing and support for the loudspeaker; the forward or...
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4024535 |
Sound generating system for a sound masking package
A self-contained sound masking package including a housing having an interior forming a loudspeaker enclosure in the bottom of which is disposed an electric circuit arranged to be connected to an...
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4000370 |
Line level microphone with built in limiter
A line level microphone. The microphone includes an amplifier and a peak limiter variably shunting the input of the amplifier to substantially avoid distortion or clipping of the microphone output...
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3939451 |
Balance control for use in 4-channel stereophonic system
A balance control comprises a box-type frame, a plurality of variable resistors individually mounted on each side wall of the frame, the upper plate of the frame having a large hole, a pair of...
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3914705 |
Control circuit with field effect transistors of a gain control amplifier
A first one of plural field effect transistors formed in a semiconductor chip is used as a control field effect transistor operatively coupled to a gain control amplifier and acting as a variable...
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3893038 |
Automatic gain control circuit
An automatic gain control circuit for a stereo amplifier having separate gain control means in each channel, each gain control means being actuated by control signal means from the same channel and...
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3819957 |
TWO CHANNEL BALANCE CONTROL DEVICE
A signal level control device for varying the level of an input signal through the variation of a variable resistor. A switching circuit is turned ON for a period of time determined by the...
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3796945 |
DIGITAL ATTENUATOR WHEREIN TRANSISTOR SWITCH MEANS ARE BIASED BY RECTIFIER CIRCUIT
The disclosure describes a digital attenuator having non-isolated, L-type attenuator sections. The sections comprise shunt legs that are switched to ground potential by bipolar NPN transistors. An...
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3784746 |
SINGLE ACTUATOR FOR EFFECTING MULTIPLE CONTROLS
A control actuator in a first mode of displacement is shifted longitudinally along a predetermined axis to effect a first form of control to blend the sound for a stereo high fidelity sound system....
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3760102 |
LEVEL SETTING IN NOISE REDUCTION SYSTEMS
A special test tone at a predetermined level is recorded or transmitted to enable the level to be set correctly on playback or reception. To enable the tone to be identified, it is intermittently...
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3699453 |
BI-DIRECTIONAL OPERATING MECHANISM
A touch-operated volume control device in which a potentiometer is adjusted by depressing either end of a deflectable key. The volume is increased, progressively, by repeatedly depressing one...
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3668323 |
AUTOMOTIVE VEHICLE SOUND DISTRIBUTION SYSTEM
In an automotive vehicle, a relay is manually operable to shift control over the sound level of a rear seat speaker from a front seat fader exclusively to a rear seat fader and the front seat fader...
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3629775 |
STEREO BALANCE AND FADER POTENTIOMETER
A voltage and/or impedance control for simultaneously adjusting a number of circuits or electrical components finding useful application in a number of environments, including the provision of a...
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3536861 |
HEARING AID CONSTRUCTION
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3446976 |
TELEPHONE OPERATED OPTOELECTRONIC VOLUME CONTROL
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3260954 |
Fader amplifier including a differential gain control mechanism
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3260952 |
Fader amplifier comprising variable gain transistor circuits
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3243511 |
Amplifier circuit
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3195067 |
Frequency compensated gain control circuit
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3055990 |
Hearing aid
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3020343 |
Audio selective fading system
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2987584 |
In-ear hearing aid
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2983797 |
Hearing aid
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2971065 |
Ear insert hearing aid
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2952748 |
Binaural eyeglass hearing aid construction
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2848539 |
Audiometer
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2824177 |
Hearing aid amplifier
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2783457 |
Voltage selection and indication
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2692305 |
Hearing and unit
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2520732 |
Sound amplifier muting means
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2515111 |
Electronic fade-in control system for phonographic reproduction or the like
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2511085 |
Cuing control for audio circuits
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2500301 |
Molded chassis for hearing aid apparatus
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2444302 |
Hearing aid
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2424243 |
Remote control system
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2389987 |
Apparatus for communication systems
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2336828 |
Portable microphone and amplifier
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2309109 |
Microphone
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2298618 |
Sound reproducing system
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2286540 |
Television system
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2253186 |
Sound characteristic control
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2226836 |
Interference-reducing system
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2207821 |
Sound picture apparatus
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2193428 |
Wired news disseminating system
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2184565 |
Sound picture apparatus
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2183389 |
Indicating circuit
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