Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1986-08-14
1988-07-19
Ng, Jin F.
Electrical audio signal processing systems and devices
Sound effects
Reverberators
328165, 381 47, 381 682, 381 71, 381 94, 381106, H04R 2500, H03B 104, H03G 700, H04B 110
Patent
active
047590718
ABSTRACT:
A noise elimination circuit, especially for a hearing aid, which removes all sound below a predetermined level and transmits a compressed sound range for all sounds above a predetermined level. The circuit uses a field effect transistor as a voltage variable resistor to transmit a signal when the sound signal is being compressed or is over a predetermined level and block the signal when the sound signal is not being compressed or is below the predetermined level. The field effect transistor drain to source resistance is varied by transmitting a signal indicative of the compression or signal level to the gate of the transistor, such that the gate voltage is higher than the source voltage when signal transfer is desired and the gate voltage is less than the source voltage when no signal transfer is desired. A switch is provided to defeat the noise elimination circuitry.
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Byrd Danita R.
Ng Jin F.
Richards Medical Company
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