Vehicular microphone system and method for post processing optimization of a microphone signal
First Claim
1. A method for post processing optimization of a microphone signal used in a vehicle mirror comprising the steps of:
- generating a signal containing both voice and noise from at least one microphone located in a vehicle;
estimating a level of the noise present within the signal;
determining if the level of the noise is above a predetermined threshold;
modifying the signal to increase the magnitude of both the voice and the noise for those frequency bands in the signal having a level of noise above the predetermined threshold;
modifying the signal to decrease the magnitude of both the voice and noise for those frequency bands in the signal having a level of noise below the predetermined threshold; and
submitting the modified signal to a post processing network.
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Accused Products
Abstract
A vehicular microphone system (200) for post processing optimization of a microphone signal includes a first transducer (201) and second transducer (203) separated by a predetermined distance within an automotive mirror. A first high pass filter network (205) is connected to the first transducer (201) while a second high pass filter network (207) connected to the second transducer (203). A low frequency shelving filter (209) is used for receiving the output from the second high pass filter (207). A first all pass filter (211) is connected to the low frequency shelving filter (209) and a second all pass filter (213) is used in connection with the first all pass filter (211) for tailoring audio characteristics. A summing amplifier (215) is used for summing the output of the first high pass filter network (201, 205) and the second all pass filter network (203, 207, 209, 211, 213) such that the first transducer (201) and second transducer (203) operate with improved directivity resulting in enhanced signal-to-noise performance in a substantially noisy vehicular environment.
8 Citations
11 Claims
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1. A method for post processing optimization of a microphone signal used in a vehicle mirror comprising the steps of:
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generating a signal containing both voice and noise from at least one microphone located in a vehicle; estimating a level of the noise present within the signal; determining if the level of the noise is above a predetermined threshold; modifying the signal to increase the magnitude of both the voice and the noise for those frequency bands in the signal having a level of noise above the predetermined threshold; modifying the signal to decrease the magnitude of both the voice and noise for those frequency bands in the signal having a level of noise below the predetermined threshold; and submitting the modified signal to a post processing network. - View Dependent Claims (2, 3)
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4. A vehicular microphone system for post processing optimization of a microphone system comprising:
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at least one microphone configured to receive a voice and a noise from inside the vehicle and generate a signal; a digital signal processor configured to; determine a noise level present within the signal; determine if the noise level is above or below a predetermined threshold; modify the signal to increase a magnitude of both the voice and noise for those frequency bands in the signal having a level of noise above the predetermined threshold; modify the signal to decrease the magnitude of both the voice and noise for those frequency bands in the signal having a level of noise below the predetermined threshold; and submit the modified signal to a post processing network. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification