Operating system with two active loudspeakers has digital amplifiers provided on power output stages of active loudspeakers
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Rack for audio-visual components has two vertical tubes on base plate with cross bores for bearer tubes on which base plates for audio-visual components are mounted using filter elements
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Circuit arrangement for preventing noise in audio signals, especially from induced ambient field, has low impedance connection between audio component housing and signal reference point
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Connecting lead for active loudspeaker systems has current supply conducted in bipolar fashion and signal conducted symmetrically with wires for current supply provided twice
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Complementary emitter follower for active filter circuit used in power amplifier, has push-pull AB operation
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Amplifying and separating mixture of frequencies into several frequency ranges esp. for multipath loud speaker combinations
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Active loudspeaker system for audio systems with Dolby (RTM) Surround (RTM)
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Active speaker system
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Driving and regulating loudspeaker - comparing actual and required diaphragm movement to control constant current source
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Movement detecting sensor for loudspeaker diaphragm - uses reflection light barrier positioned roughly halfway between max. and zero reflection from reflector
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Cassette audiotape apparatus
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Twin drive for magnetic tape recorder - uses belt driven flywheels to provide speed differential between drive spindles to tension tape
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Programme-controlled tape recorder or sound projector - allowing automatic selection of required sections of recording or film
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Drive unit for magnetic tape-recorders
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Driving mechanism for magnetic tape unit - has rectangular housing with supports for winding spools and U-shaped edge frame for two electromagnets
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Operating drive system for magnetic tape unit - has train of five meshing gears and reverse running mechanical coupling with electrical keyboard control unit
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Tachogenerator for record player speed control - has four stator windings at 45 degree phase intervals to double frequency
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Roller drive for tape cassette - has friction belt and roller drive to maintain magnetic tape under continuous controlled tension
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Electromagnetic tacho-generator for speed and direction indication - has two phase-shifted meander windings for speed-direction analogue output
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Small synchronous motor with permanent magnet rotor - has meander type winding on printed circuit strip as coreless stator
