Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1991-06-28
1992-12-08
Dwyer, James L.
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381 682, 381 684, H04R 2500
Patent
active
051704340
ABSTRACT:
A hearing aid that generally provides greater amplification for speech signals than noise signals. The hearing aid includes a microphone, variable highpass filter, transducer, and sensor assembly. The sensor assembly detects the amplitude of a band of low frequencies of the highpass filtered microphone signal, and provides a feedback signal to the variable filter to influence its cutoff frequency based on the characterisics of the highpass filtered microphone signal. The sensor also takes the time characteristics of the signal envelope into account, distinguishing between steady state noise-like signals and dynamically varying signals, such as speech. In response to loud, low frequency, substantially steady state signals, above a threshold amplitude, the sensor provides a feedback signal to the variable filter such that the cutoff frequency is raised. In response to softer, and/or higher frequency, and/or more dynamically amplitude varying signals, the cutoff frequency of the variable filter is raised less or left at a lower value.
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Technological Reports: Compression Amplification with Environment Controlled Release Time. By; Toni Gitles, MA and Fred A. Wilson, AST.
Beltone Electronics Corporation
Chan Jason
Dwyer James L.
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