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Signal limit based on measured radiator excursion

  • US 10,327,061 B2
  • Filed: 05/07/2018
  • Issued: 06/18/2019
  • Est. Priority Date: 10/06/2016
  • Status: Active Grant
First Claim
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1. A playback device comprising:

  • a network interface;

    an audio stage comprising one or more amplifiers;

    a speaker driver;

    one or more processors; and

    a housing, the housing carrying at least the network interface, the audio stage, the speaker driver, the one or more processors and data storage having stored therein instructions executable by the one or more processors to cause the playback device to perform operations comprising;

    receiving, via the network interface, audio content;

    generating an audio signal representing the audio content, wherein generating the audio signal comprises modifying portions of the audio content to limit excursion of the speaker driver to less than an excursion limit when a forward prediction model indicates that the portions of the audio content are predicted to cause the speaker driver to move beyond the excursion limit;

    while playing back the generated audio signal via the audio stage, measuring excursion of the speaker driver;

    generating a feedback signal based on the measured excursion; and

    adjusting the forward prediction model based on the generated feedback signal.

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