Communication system for passenger vehicle
First Claim
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1. Audio apparatus for use in the passenger compartment of a vehicle comprising:
- a first microphone generating first microphone signals and located at one end of said passenger compartment;
a second microphone generating second microphone signals and located at said one end of said passenger compartment separated from said first microphone by a first distance such that a passenger at said one end of said passenger compartment is located substantially closer to one of said first and second microphones than the other of said first and second microphones;
differential amplifier means having inverting and noninverting inputs receiving said first and second microphone signals, respectively; and
a speaker located at the other end of said passenger compartment and connected to said differential amplifier means to produce sound in response to an output signal from said differential amplifier means, said speaker being separated from said first and second microphones by respective distances greater than said first distance so that sound produced by said speaker arrives at said first and second microphones substantially in phase.
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Abstract
The invention enhances the ability of rear seat passengers in a vehicle to hear the speech of a front seat occupant. Two spaced microphones in the front seat area pick up speech signals which are differentially amplified and filtered in a bandpass filter and at least one notch filter. The filter signals are reproduced through speakers in the area of the rear seat. Differential amplification of the microphone signals results in greatly reduced acoustic feedback from the speakers to the microphones. The communication system of the invention is highly integrated into other communication and audio systems in the vehicle.
45 Citations
12 Claims
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1. Audio apparatus for use in the passenger compartment of a vehicle comprising:
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a first microphone generating first microphone signals and located at one end of said passenger compartment; a second microphone generating second microphone signals and located at said one end of said passenger compartment separated from said first microphone by a first distance such that a passenger at said one end of said passenger compartment is located substantially closer to one of said first and second microphones than the other of said first and second microphones; differential amplifier means having inverting and noninverting inputs receiving said first and second microphone signals, respectively; and a speaker located at the other end of said passenger compartment and connected to said differential amplifier means to produce sound in response to an output signal from said differential amplifier means, said speaker being separated from said first and second microphones by respective distances greater than said first distance so that sound produced by said speaker arrives at said first and second microphones substantially in phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification