Audio driver system and method
First Claim
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1. A method for use in an audio system, the method comprising:
- (a) selecting a frequency in a frequency range;
(b) selecting an amplitude from a plurality of amplitudes;
(c) causing a signal generator to generate a signal at the frequency and the amplitude;
(d) providing the signal to a loudspeaker to generate a sound;
(e) generating a sound signal representing the sound using a microphone;
(f) determining whether the sound signal has a distortion;
(g) if the determining determines that the sound signal does not have the distortion and if a last amplitude of the plurality of amplitudes has not been reached, selecting another amplitude of the plurality of amplitudes and repeating steps (c)-(g) until the determining determines that the sound signal has the distortion;
(h) recording, in response to determining that the sound signal has the distortion, the another amplitude causing the distortion as a minimum amplitude; and
(i) filtering an audio signal utilizing the minimum amplitude.
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Abstract
A system and apparatus for constructing a displacement model across a frequency range for a loudspeaker is disclosed. The resultant displacement model is centered around the distortion point. Once a distortion model is constructed it can be incorporated into an audio driver to prevent distortion by incorporating the model and a distortion compensation unit with a conventional audio driver. Various topologies can be used to incorporate a distortion model and distortion compensation unit into an audio driver. Furthermore, a wide variety of distortion compensation techniques can be employed to avoid distortion in such an audio driver.
19 Citations
19 Claims
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1. A method for use in an audio system, the method comprising:
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(a) selecting a frequency in a frequency range; (b) selecting an amplitude from a plurality of amplitudes; (c) causing a signal generator to generate a signal at the frequency and the amplitude; (d) providing the signal to a loudspeaker to generate a sound; (e) generating a sound signal representing the sound using a microphone; (f) determining whether the sound signal has a distortion; (g) if the determining determines that the sound signal does not have the distortion and if a last amplitude of the plurality of amplitudes has not been reached, selecting another amplitude of the plurality of amplitudes and repeating steps (c)-(g) until the determining determines that the sound signal has the distortion; (h) recording, in response to determining that the sound signal has the distortion, the another amplitude causing the distortion as a minimum amplitude; and (i) filtering an audio signal utilizing the minimum amplitude. - View Dependent Claims (2, 3, 4, 5)
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6. An audio driver comprising:
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a digital to analog converter (DAC); an amplifier; a signal generator; and an analysis module configured to; (a) select a frequency in a frequency range; (b) select an amplitude from a plurality of amplitudes; (c) cause the signal generator to generate a signal having the frequency and the amplitude; (d) determine whether the signal has the distortion; (e) if the determining determines that the signal does not have the distortion and if a last amplitude of the plurality of amplitudes has not been reached, selecting another amplitude of the plurality of amplitudes and repeating steps (c)-(e); (f) record, in response to determining that the signal has the distortion, the another amplitude causing the distortion as a minimum amplitude; and (g) filter an audio signal utilizing the minimum amplitude. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification