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Adaptive gain and filtering circuit for a sound reproduction system
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1998 |
| Description | Adaptive compressive gain and level dependent spectral shaping circuitry for a hearing aid include a microphone to produce an input signal and a plurality of channels connected to a common circuit output. Each channel has a preset frequency response. Each channel includes a filter with a preset frequency response to receive the input signal and to produce a filtered signal, a channel amplifier to amplify the filtered signal to produce a channel output signal, a threshold register to establish a channel threshold level, and a gain circuit. The gain circuit increases the gain of the channel amplifier when the channel output signal falls below the channel threshold level and decreases the gain of the channel amplifier when the channel output signal rises above the channel threshold level. A transducer produces sound in response to the signal passed by the common circuit output. |
| File Size | 4146527 |
| Page Count | 111 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20080006957 |
| Archival Resource Key | ark:/13960/t88h3jw21 |
| Language | English |
| Publisher Date | 1998-01-06 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Amplification Patents Hearing Circuits Adaptive Filters Microphones Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
