Method for converting an analog signal to a digital signal
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Method and arrangement for converting an acoustic signal into an electrical signal
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Device for adjusting the amplification of electrical signals in control systems, in particular audio signals in mixing consoles
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Method and circuit arrangement for controlling microphones
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ELECTROACOUSTIC CONVERTER
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Voltage controlled amplification of input signal - feeding correction signal for characteristic fault into logarithmic and/or anti-logarithmic paths
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Process for cutting a modulated spiral-shaped groove in a planar recording carrier
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Multi-channel sound control system
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Level-setting device for modulation signals
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Microphone
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METHOD AND CIRCUIT ARRANGEMENT FOR CUTTING A WHEEL MODULATED WITH SIGNALS
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Process and circuit arrangement for avoiding echo effects in the magnetic recording of signals onto planar signal carriers
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Swarf remover taking cuttings from metal disc - by coiling swarf under constant tension inside suction chamber after passing between rollers with slip coupling
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Record disc groove cutting error correction - using comparison of modulation amplitude and groove depth control signal to derive error signal
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Record disc groove cutting control - using control signal derived from signals to be recorded, which is squared to generate cut depth
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Directional circuit for two unified electret-capacitor microphones - provides control to give desired variable directional properties
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Secondary battery voltage monitor - has series-connected high value capacitor and optical indicator connected across load input
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Automatic cutter control network - minimises cut track separation on record discs according to signal amplitude and previous track width
