Protection of speaker from excess excursion
AssigneeSynaptics Incorporated
InventorsRichard Hodges, Harry Lau, Michael Townsend
Life of this patent
Estimating the term…
Abstract
Systems and methods for protecting a loudspeaker from excessive excursion include an audio source, an adaptive excursion protection filter, an audio clipper, an inverse excursion protection filter, an amplifier and a loudspeaker. The system performs operations including receiving an audio signal, applying an excursion protection filter, the excursion protection filter adapting in real-time to one or more speaker conditions, clipping the audio signal, applying an inverse excursion protection filter, and amplifying, using an amplification circuit, the audio signal for output to the speaker.
Claims20
A method performed by an audio processing system, comprising:
- receiving an audio signal;
- amplifying the audio signal for output via a speaker;
- receiving current and voltage data associated with the amplified audio signal;
- estimating an impedance of the speaker based on the received current and voltage data;
- estimating a direct current resistance (Rdc) of a speaker coil that drives a cone of the speaker based on the estimated impedance;
- updating an excursion model representing an excursion of the speaker based at least in part on an algorithm that utilizes a motion of the cone of the speaker as a function of the estimated direct current resistance Rdc;
- and
- dynamically adjusting the amplification of the audio signal based at least in part on the updated excursion model.
An audio processing system comprising:
- an amplifier configured to receive and amplify an audio signal for output via a speaker;
- and
- a speaker protection system configured to protect the speaker from excess excursion by:
- receiving current and voltage data associated with the amplified audio signal;
- estimating an impedance of the speaker based on the received current and voltage data;
- estimating a direct current resistance (Rdc) of a speaker coil that drives a cone of the speaker based on the estimated impedance;
- updating an excursion model representing an excursion of the speaker based at least in part on an algorithm that utilizes a motion of the cone of the speaker as a function of the estimated direct current resistance Rdc;
- and
- dynamically adjusting the amplification of the audio signal based at least in part on the updated excursion model.
A speaker protection system comprising:
- one or more processors;
- and
- a memory storing instruction that, when executed by the one or more processors, causes the speaker protection system to:
- receive an audio signal;
- receive current and voltage data associated with an amplification of the audio signal for output via a speaker;
- estimate an impedance of the speaker based on the received current and voltage data;
- estimate a direct current resistance (Rdc) of a speaker coil that drives a cone of the speaker based on the estimated impedance;
- update an excursion model representing an excursion of the speaker based at least in part on an algorithm that utilizes a motion of the cone of the speaker as a function of the estimated direct current resistance Rdc;
- and
- dynamically adjust the amplification of the audio signal based at least in part on the updated excursion model.
Dependencies are inferred from the claim text.