Electrical audio signal processing systems and devices – Audio transducer protection circuitry
Patent
1988-04-29
1990-07-24
Isen, Forester W.
Electrical audio signal processing systems and devices
Audio transducer protection circuitry
381 59, 381106, H03G 1100
Patent
active
049440152
ABSTRACT:
An audio compression circuit for limiting an audio television signal in a linear fashion at a pre-established maximum level is disclosed. The circuit includes a series resistance circuit for establishing a predetermined resistance on an amplifier to establish a supply voltage through a detection and level adjustment circuit. The detection and level adjustment circuit increases the supply voltage to a relatively higher reference voltage, which is shifted through a level adjustment circuit to a control voltage, which control voltage is greater than a threshold voltage of a field effect transistor. The field effect transistor is a significant aspect of a shunt circuit connected in parallel to the detection and level adjustment circuit. The shunt circuit acts in response to the control voltage to vary the resistance across the drain and source of the field effect transistor to prevent the outlet voltage to a loudspeaker from exceeding a predetermined level established by the level adjustment circuit.
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Automatic Electric Technical Journal, vol. 3, Apr. 11, 1962, pp. 55-62.
Juve Ronald A.
Kaufman George S.
Anderson Gregg I.
Isen Forester W.
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