Audio processor for use in high noise environments

Details Audio processor for use in high noise environments Audio processor for use in high noise environments

1977-02-22

1977-12-06

Claffy, Kathleen H.

H04M 119

Patent

active

040618757

ABSTRACT:
There is disclosed apparatus for providing improved hearing acuity in the presence of high intensity background noise, such as that which exists at an industrial site.
The apparatus employs an input microphone which is adapted to receive audio information including noise from the environment. The output of the microphone is applied to an expander circuit, which functions to expand the high pass audio frequency band according to the nature and intensity of the noise. In a first mode expansion is provided at a variable ratio and threshold which are selected according to environmental noise. The expanded audio signal is applied to a compressor limiter module to reduce the level and limit the amplitude of the signal within predetermined and safe limits. The compressor limiter output signal is applied to an adjustable low pass filter, which serves further to accommodate the processed signal to a particular user and to limit the frequency range of the output signals. This low pass filter has an output applied to a linear attenuator which serves to reduce the amplitude of the processed signal depending upon the particular noise levels at the site. This output signal is applied to a speaker which is located in proximity with the ear of a user to allow him to communicate relatively normally in high noise environments. Additional modes are described which employ both expansion and compression prior to limiting.

REFERENCES:
patent: 3894195 (1975-07-01), Kryter
patent: 3952158 (1976-04-01), Kyle et al.

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