Signal limit based on measured radiator excursion
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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Abstract
Example techniques may involve controlling a passive radiator. An implementation may include a device playing back an input signal representing audio content via one or more active speakers. The device measures excursion of the passive radiator when the input signal is played back via the one or more active speakers. The device limits excursion of the passive radiator to less than an excursion limit when certain input causes the passive radiator to move beyond the excursion limit.
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Citations
20 Claims
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1. A playback device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A tangible, non-transitory computer-readable medium having stored therein instructions executable by one or more processors to cause a playback device to perform a method comprising:
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receiving, via a network interface, audio content, wherein the network interface is carried in a housing of the playback device; generating an audio signal representing the audio content, wherein generating the audio signal comprises modifying portions of the audio content to limit excursion of a 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, wherein the speaker driver is carried by the housing; while playing back the generated audio signal via an audio stage comprising one or more amplifiers, measuring excursion of the speaker driver, wherein the audio stage is carried by the housing; generating a feedback signal based on the measured excursion; and adjusting the forward prediction model based on the generated feedback signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method to be performed by a playback device comprising a housing carrying at least a network interface, an audio stage comprising one or more amplifiers, and a speaker driver, the method comprising:
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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. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification