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Use of Tapped Delay Lines in Speaker Work

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A set of 10, 32 stage tapped analogue delay lines has been used to simulate impulse responses. In one mode of operation the taps are set up in order to pre distort the signal fed to a loudspeaker. This pre-distorted impulse response can be arranged under certain circumstances, to be the inverse of the real speaker impulse response. When analyzed it would be found to contain peaks and dips where the real speakers frequency response would contain dips and peaks and it would also contain resonances of the same amplitude and frequency but opposite phase to the real speaker. In this way all linear distortions such as diffraction, resonances, phase errors, amplitude irregularities etx. can be concelled out. The line can also be used to simulate any impulse response desired such as low, high or band pass filters or the impulse response of any electrical circuit. Finally the Hilbert transform can be accomplished by setting the taps appropriately and feeding the frequency reponse into the delay line. The phase response corresponding to this minimum phase frequency response will be found at the summed tap output of the line.

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AES - Audio Engineering Society