Selective acoustic optimization for thermally or power limited speaker systems
A system may include a first input configured to receive a playback signal to be played back to a transducer, a second input configured to receive temperature information associated with the transducer, and a thermal-controlled gain element configured to determine a sub-band gain to be applied to a selected frequency band of the playback signal, wherein the thermal-controlled gain element determines the gain based on the temperature information and apply the sub-band gain to the selected frequency band.
1. A system comprising:
a first input configured to receive a playback signal to be played back to a transducer;
a second input configured to receive temperature information associated with the transducer, wherein the temperature information comprises a temperature associated with the transducer and a rate of change of the temperature associated with the transducer, and wherein the temperature and the rate of change are based on a monitored output voltage of the transducer and a monitored output current of the transducer;
a thermal-controlled gain element configured to:
determine a sub-band gain to be applied to a selected frequency band of the playback signal, wherein the thermal-controlled gain element determines the gain based on the temperature information; and
apply the sub-band gain to the selected frequency band to generate a first intermediate signal;
a thermal protection system configured to apply a first full-band gain, in series with the sub-band gain, to the first intermediate signal based on a temperature associated with the transducer, to generate a second intermediate signal; and
a power limiter configured to apply a full-band gain, in series with the sub-band gain and the first full-band gain, to the second intermediate signal based on a power consumption associated with the transducer, wherein application of the full-band gain is conditioned on the temperature exceeding a threshold temperature, to generate an output signal.
2. The system of claim 1 , wherein the thermal-controlled gain element decreases the sub-band gain in response to an increase of the temperature.
3. The system of claim 1 , wherein the selected frequency band is a frequency range of the transducer having a lower efficiency at the selected frequency band compared to other frequency ranges of the transducer.
4. The system of claim 1 , wherein the power limiter is controlled with an adaptive control loop based on a difference between the power consumption and a target power consumption for the transducer.
5. The system of claim 1 , wherein the thermal-controlled gain element is further configured to:
divide the playback signal into a plurality of different frequency bands; and
apply different gains to each of the different frequency bands.
6. The system of claim 5 , wherein each of the different gains is based on the temperature information.
7. The system of claim 1 , wherein the thermal-controlled gain element is further configured to apply the sub-band gain only when a temperature associated with the transducer is above a threshold temperature.
8. A method comprising:
determining, based on temperature information associated with a transducer, a sub-band gain to be applied to a selected frequency band of a playback signal to be played back to the transducer, wherein the temperature information comprises a temperature associated with the transducer and a rate of change of the temperature associated with the transducer, and wherein the temperature and the rate of change are based on a monitored output voltage of the transducer and a monitored output current of the transducer;
applying the sub-band gain to the selected frequency band to generate a first intermediate signal;
applying a first full-band gain, in series with the sub-band gain, to the first intermediate signal based on a temperature associated with the transducer, to generate a second intermediate signal; and
applying a full-band gain by a power limiter, in addition to series with the sub-band gain and the first full-band gain, to the playback second intermediate signal based on a power consumption associated with the transducer, wherein application of the full-band gain is conditioned on the temperature exceeding a threshold temperature, to generate an output signal.
9. The method of claim 8 , further comprising decreasing the sub-band gain in response to an increase of the temperature.
10. The method of claim 8 , wherein the selected frequency band is a frequency range of the transducer having a lower efficiency at the selected frequency band compared to other frequency ranges of the transducer.
11. The method of claim 8 , further comprising controlling the power limiter with an adaptive control loop based on a difference between the power consumption and a target power consumption for the transducer.
12. The method of claim 8 , further comprising:
dividing the playback signal into a plurality of different frequency bands; and
applying different gains to each of the different frequency bands.
13. The method of claim 12 , wherein each of the different gains is based on the temperature information.
14. The method of claim 8 , further comprising applying the sub-band gain only when a temperature associated with the transducer is above a threshold temperature.