Thermal control of audio playback devices
To avoid damage from overheating, playback device operation can be modulated based on input from temperature sensors. An example method includes obtaining, via one or more temperature sensors carried by the playback device, temperature data. Based on the temperature data, a first temperature parameter is detected. In response to detecting the first temperature parameter, a gain of audio playback is decreased by a first amount. After decreasing the gain of audio playback by the first amount, a second temperature parameter is detected. In response to detecting the second temperature parameter, the gain of audio playback is decreased by a second amount different than the first amount.
1. A playback device comprising:
a plurality of temperature sensors;
at least one audio transducer;
one or more processors; and
data storage having instructions thereon that, when executed by the one or more processors, cause the playback device to perform operations comprising:
obtaining sensor data from each of the plurality temperature sensors, the sensor data indicating an increase in temperature;
for each temperature sensor, determining an amount of gain reduction to be applied to audio playback based at least in part on the sensor data; and
decreasing a gain of audio playback by a first amount, wherein the first amount comprises the largest gain reduction from among the gain reductions determined for each of the temperature sensors.
2. The playback device of claim 1 , wherein the playback device is a first playback device bonded with a second playback device for synchronous playback, the operations further comprising decreasing a gain of audio playback via the second playback device concurrently with decreasing the gain of audio playback via the first playback device by the first amount.
3. The playback device of claim 1 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature has fallen below a predetermined temperature threshold and, based at least in part on the determination, increasing a gain of audio playback.
4. The playback device of claim 1 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature is falling and, based at least in part on the determination, increasing the gain of audio playback.
5. The playback device of claim 1 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature has risen above a predetermined threshold and, based at least in part on the determination, shutting down the playback device.
6. The playback device of claim 1 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature is steady near an upper threshold and, based at least in part on the determination, further decreasing the gain of audio playback.
7. The playback device of claim 1 , wherein the operations further comprise determining a time since a last detected temperature increase of at least a predetermined amount, and determining the amount of gain reduction to be applied to audio playback based at least in part on the determined time.
8. A method of thermal control of a playback device, the method comprising:
obtaining sensor data from each of a plurality of temperature sensors carried by the playback device, the sensor data indicating an increase in temperature;
for each temperature sensor, determining an amount of gain reduction to be applied to audio playback based at least in part on the sensor data; and
decreasing a gain of audio playback by a first amount, wherein the first amount comprises the largest gain reduction from among the gain reductions determined for each of the temperature sensors.
9. The method of claim 8 , wherein the playback device is a first playback device bonded with a second playback device for synchronous playback, the method further comprising decreasing a gain of audio playback via the second playback device concurrently with decreasing the gain of audio playback via the first playback device by the first amount.
10. The method of claim 8 , further comprising, after decreasing the gain, determining that the sensor data indicates temperature has fallen below a predetermined temperature threshold and, based at least in part on the determination, increasing a gain of audio playback.
11. The method of claim 8 , further comprising, after decreasing the gain, determining that the sensor data indicates temperature is falling and, based at least in part on the determination, increasing the gain of audio playback.
12. The method of claim 8 , further comprising, after decreasing the gain, determining that the sensor data indicates temperature has risen above a predetermined threshold and, based at least in part on the determination, shutting down the playback device.
13. The method of claim 8 , further comprising, after decreasing the gain, determining that the sensor data indicates temperature is steady near an upper threshold and, based at least in part on the determination, further decreasing the gain of audio playback.
14. The method of claim 8 , further comprising determining a time since a last detected temperature increase of at least a predetermined amount, and determining the amount of gain reduction to be applied to audio playback based at least in part on the determined time.
15. One or more tangible, non-transitory computer-readable media storing instructions that, when executed by one or more processors of a playback device, cause the playback device to perform operations comprising:
obtaining sensor data from each of a plurality of temperature sensors carried by the playback device, the sensor data indicating an increase in temperature;
for each temperature sensor, determining an amount of gain reduction to be applied to audio playback based at least in part on the sensor data; and
decreasing a gain of audio playback by a first amount, wherein the first amount comprises the largest gain reduction from among the gain reductions determined for each of the temperature sensors.
16. The one or more computer-readable media of claim 15 , wherein the playback device is a first playback device bonded with a second playback device for synchronous playback, the operations further comprising decreasing a gain of audio playback via the second playback device concurrently with decreasing the gain of audio playback via the first playback device by the first amount.
17. The one or more computer-readable media of claim 15 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature has fallen below a predetermined temperature threshold and, based at least in part on the determination, increasing a gain of audio playback.
18. The one or more computer-readable media of claim 15 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature is falling and, based at least in part on the determination, increasing the gain of audio playback.
19. The one or more computer-readable media of claim 15 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature has risen above a predetermined threshold and, based at least in part on the determination, shutting down the playback device.
20. The one or more computer-readable media of claim 15 , wherein the operations further comprise, after decreasing the gain, determining that the sensor data indicates temperature is steady near an upper threshold and, based at least in part on the determination, further decreasing the gain of audio playback.