Control circuit

Details Control circuit Control circuit

1985-05-06

1987-10-20

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 684, 381 69, H04R 2500, H04R 2504

Patent

active

047019581

ABSTRACT:
An automatic gain control circuit for an output signal of a magnetic earpiece of a hearing aid, which comprises a voltage source, an output amplifier stage having an input connected to the voltage source and an output connected to the magnetic earpiece, the earpiece having a working winding connected between the amplifier stage output and the voltage source, and a control loop for automatic gain control. The control loop includes a rectifier and an additional winding connected in series with the working winding of the earpiece, the windings constituting an autotransformer, the additional winding connecting the rectifier to the output of the amplifier stage and the rectifier being connected to the input of the amplifier stage.

REFERENCES:
patent: 3015704 (1962-01-01), Behymer
patent: 3106609 (1963-10-01), Dusey
patent: 3405348 (1968-10-01), Biega et al.
patent: 3571529 (1971-03-01), Gharib et al.
patent: 4130725 (1978-12-01), Nagel
patent: 4201886 (1980-05-01), Nagel
patent: 4360787 (1982-11-01), Galpin

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