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Audio Signal Processing

Apparatus-and-method-for-adjusting-audio-equipment-in-acoustic-environments

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Details

Inventors: Thomasson, Samuel L.;
Assignee: Acoustic Technologies, Inc. (Mesa, AZ)
Primary Examiner: Isen; Forester W.
Assistant Examiner: Mei; Xu
Attorney, Agent or Firm: Wille; Paul F.

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.

DETAILED DESCRIPTION The foregoing objects are achieved by this invention in which 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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