Apparatus and method for adjusting audio equipment in acoustic environments
First Claim
Patent Images
1. A method for adjusting audio equipment for acoustic environments, said method comprising the steps of:
- broadcasting an audio signal having a carrier modulated by an inaudible replica of the carrier;
converting the audio signal into an electrical signal;
demodulating the electrical signal to recover the carrier and the replica;
comparing the carrier and the replica to determine phase delay and attenuation of the carrier; and
adjusting said audio equipment to match phase delay and minimize attenuation.
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Abstract
The signal in each channel of a stereo is modulated at an inaudible frequency by a replica of the original signal. The modulated signal is broadcast into a room by a loudspeaker and is picked up by a microphone. The microphone is coupled to the stereo, which includes a demodulator for separating the replica from the signal as received at the microphone. By comparing the replica with the demodulated signal, data is extracted to compensate for the acoustic characteristics of the loudspeaker and the room in which the loudspeaker is located.
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Citations
10 Claims
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1. A method for adjusting audio equipment for acoustic environments, said method comprising the steps of:
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broadcasting an audio signal having a carrier modulated by an inaudible replica of the carrier; converting the audio signal into an electrical signal; demodulating the electrical signal to recover the carrier and the replica; comparing the carrier and the replica to determine phase delay and attenuation of the carrier; and adjusting said audio equipment to match phase delay and minimize attenuation. - View Dependent Claims (2, 3, 4)
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5. Apparatus for testing and adjusting audio equipment in an acoustic environment, said apparatus comprising:
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a microphone for converting sound into an electrical signal, wherein the sound includes an audible carrier and an inaudible replica of said carrier modulated onto said carrier; a compensating circuit coupled to said microphone for testing said acoustic environment by comparing said carrier with said replica and producing a control signal indicative of said comparison; an equalizer coupled to said compensating circuit and responsive to said control signal by adjusting the amplitude vs. frequency characteristics of said equalizer. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification