Loudness maximization with constrained loudspeaker excursion
First Claim
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1. A method of constraining loudspeaker excursion in a mobile station, comprising:
- receiving an input audio signal at the mobile station;
transforming, in the digital domain, the input audio signal into a plurality of subband signals in the equal rectangular band (ERB) scale;
determining a peak excursion, in the digital domain, of a loudspeaker of the mobile station, for either one or more of the entire ERB subbands or certain portions of one or more ERB subbands;
performing signal processing on the subband signals based on the peak excursion and a maximum loudspeaker excursion to limit the excursion of the loudspeaker; and
combining and outputting the signal processed subband signals to the loudspeaker.
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Abstract
An original loudness level of an audio signal is maintained for a mobile device while maintaining sound quality as good as possible and protecting the loudspeaker used in the mobile device. The loudness of an audio (e.g., speech) signal may be maximized while controlling the excursion of the diaphragm of the loudspeaker (in a mobile device) to stay within the allowed range. In an implementation, the peak excursion is predicted (e.g., estimated) using the input signal and an excursion transfer function. The signal may then be modified to limit the excursion and to maximize loudness.
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Citations
40 Claims
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1. A method of constraining loudspeaker excursion in a mobile station, comprising:
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receiving an input audio signal at the mobile station; transforming, in the digital domain, the input audio signal into a plurality of subband signals in the equal rectangular band (ERB) scale; determining a peak excursion, in the digital domain, of a loudspeaker of the mobile station, for either one or more of the entire ERB subbands or certain portions of one or more ERB subbands; performing signal processing on the subband signals based on the peak excursion and a maximum loudspeaker excursion to limit the excursion of the loudspeaker; and combining and outputting the signal processed subband signals to the loudspeaker. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for constraining loudspeaker excursion in a mobile station, comprising:
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means for receiving an input audio signal at the mobile station; means for transforming, in the digital domain, the input audio signal into a plurality of subband signals in the equal rectangular band (ERB) scale; means for determining a peak excursion, in the digital domain, of a loudspeaker of the mobile station, for either one or more of the entire ERB subbands or certain portions of one or more ERB subbands; means for performing signal processing on the subband signals based on the peak excursion and a maximum loudspeaker excursion to limit the excursion of the loudspeaker; and means for combining and outputting the signal processed subband signals to the loudspeaker. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A non-transitory computer-readable medium comprising instructions that cause a computer to:
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receive an input audio signal at a mobile station; transform, in the digital domain, the input audio signal into a plurality of subband signals in the equal rectangular band (ERB) scale; determine a peak excursion, in the digital domain, of a loudspeaker of the mobile station, for either one or more of the entire ERB subbands or certain portions of one or more ERB subbands; perform signal processing on the subband signals based on the peak excursion and a maximum loudspeaker excursion to limit the excursion of the loudspeaker; and combine and output the signal processed subband signals to the loudspeaker. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus for constraining loudspeaker excursion in a mobile station, comprising:
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an excursion predictor for receiving an input audio signal at the mobile station, and for determining a peak excursion, in the digital domain, of a loudspeaker of the mobile station, for either one or more entire ERB subbands or certain portions of one or more ERB subbands; and an excursion limiting signal processor for transforming, in the digital domain, the input audio signal into a plurality of subband signals in the equal rectangular band (ERB) scale, for performing signal processing on the subband signals based on the peak excursion and a maximum loudspeaker excursion to limit the excursion of the loudspeaker, and for combining and outputting the signal processed subband signals to the loudspeaker. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification