Power management techniques for waking-up processors in media playback systems
According to at least one aspect, power management techniques are disclosed that may reduce the power consumption of devices, such as those devices in media playback systems, without introducing a noticeable lag between a user issuing a command and the device processing the command. In some embodiments, the device may put to sleep (including turn off) electronic components that are only used for specific commands. In these embodiments, the devices may identify periods where the specific commands are likely to be invoked and, in response to identifying such a period, wake-up the electronic components. As a result, the power consumption of the device may be substantially reduced because various electronic components may be put to sleep instead of remaining idle in an awake state.
1. A playback device comprising:
one or more amplifiers configured to drive one or more speakers;
one or more network interface components for communicating over a wireless network, wherein the network interface components comprise a network circuit configured to:
determine whether the wireless network is within range of the playback device; and
output a signal responsive to determining that the wireless network is within range;
at least one non-transitory computer-readable medium;
one or more processing components comprising a processor having a plurality of power states including a first power state, a second power state, and a third power state, wherein the processor consumes more power in the second power state than in the first power state; and
program instructions stored on the at least one non-transitory computer-readable medium that are executable by the one or more processing components such that the playback device is configured to:
detect, by the one or more processing components, the output signal from the one or more network interface components;
responsive to detecting of the output signal from the one or more network interface components:
cause the processor to transition from the first power state to the second power state;
after causing the processor to transition from the first power state to the second power state, communicate with a computing device over the wireless network; and
after communicating with the computing device over the wireless network, cause the processor to transition from the second power state to the third power state;
while the processor is in the third power state, (a) receive, via the wireless network, a first command, and (b) based on the first command, cause the processor to transition from the third power state to the second power state; and
while the processor is in the second power state, (a) receive a second command, and (b) based on the second command, (i) obtain, over the wireless network, audio content via the one or more network interface components using the processor and (ii) play, via the one or more amplifiers and the one or more speakers, the audio content.
2. The playback device of claim 1 , wherein the program instructions that are executable by the one or more processing components such that the playback device is configured to communicate with the computing device comprise program instructions that are executable by the one or more processing components such that the playback device is configured to:
obtain registration information associated with a remote server from the computing device via the one or more network interface components using the processor; and
store the registration information from the computing device in a memory.
3. The playback device of claim 2 , wherein the program instructions that are executable by the one or more processing components such that the playback device is configured to obtain, over the wireless network, the audio content via the one or more network interface components comprise program instructions that are executable by the one or more processing components such that the playback device is configured to:
retrieve the registration information from the memory using the processor; and
based on the registration information, communicate with the remote server over the wireless network via the network interface components using the processor.
4. The playback device of claim 1 , wherein the program instructions that are executable by the one or more processing components such that the playback device is configured to determine whether the wireless network is within range comprise program instructions that are executable by the one or more processing components such that the playback device is configured to:
receive a message comprising a service set identifier (SSID); and
determine whether the wireless network is in range based on the message, wherein determining whether the wireless network is in range comprises determining whether the wireless network is in range based at least on the SSID in the message.
5. The playback device of claim 4 , wherein the program instructions that are executable by the one or more processing components such that the playback device is configured to determine whether the wireless network is in range based on the message further comprise program instructions that are executable by the one or more processing components such that the playback device is configured to:
determine a received signal strength indicator (RSSI) value associated with the message; and
determine whether the wireless network is in range further based on the RSSI value associated with the message.
6. The playback device of claim 1 , wherein the wireless network comprises a wireless local area network (WLAN).
7. The playback device of claim 1 , wherein the playback device is constructed as a headphone.
8. The playback device of claim 7 , wherein the headphone is an on-ear headset, an over-ear headset, or an in-ear headset.
9. The playback device of claim 1 , wherein the first power state is a deep sleep state and the third power state is a light sleep state, and wherein the processor in the third power state consumes more power than in the first power state but less power than in the second power state.
10. The playback device of claim 1 , wherein the first power state and the third power state are a same power state.
11. A method of operating a playback device comprising one or more network interface components configured to communicate over a wireless network and one or more processing components comprising a processor having a plurality of power states including a first power state, a second power state, and a third power state, wherein the processor consumes more power in the second power state than in the first power state, the method comprising:
using the one or more network interface components:
determining whether the wireless network is within range; and
responsive to determining that the wireless network is within range, providing an output signal to the one or more processing components; and
using the one or more processing components:
detecting, by the one or more processing components, the output signal from the one or more network interface components;
responsive to detecting of the output signal from the one or more network interface components:
causing the processor to transition from the first power state to the second power state;
after causing the processor to transition from the first power state to the second power state, communicating with a computing device over the wireless network; and
after communicating with the computing device over the wireless network, causing the processor to transition from the second power state to the third power state;
while the processor is in the third power state, (a) receiving, via the wireless network, a first command, and (b) based on the first command, causing the processor to transition from the third power state to the second power state; and
while the processor is in the second power state, (a) receiving a second command, and (c) based on the second command, (i) obtaining, over the wireless network, audio content via the one or more network interface components using the processor and (ii) playing, via one or more amplifiers of the playback device and one or more speakers of the playback device, the audio content.
12. The method of claim 11 , wherein communicating with the computing device comprises:
obtaining registration information associated with a remote server from the computing device via the one or more network interface components using the processor; and
storing the registration information from the computing device in a memory.
13. The method of claim 12 , wherein obtaining, over the wireless network, audio content via the one or more network interface components comprises:
retrieving the registration information from the memory using the processor; and
based on the registration information, communicating with the remote server over the wireless network via the network interface components using the processor.
14. The method of claim 11 , wherein determining whether the wireless network is within range comprises:
receiving a message comprising a service set identifier (SSID); and
determining whether the wireless network is in range based on the message, wherein determining whether the wireless network is in range comprises determining whether the wireless network is in range based at least on the SSID in the message.
15. The method of claim 14 , wherein determining whether the wireless network is in range based on the message further comprises:
determining a received signal strength indicator (RSSI) value associated with the message; and
determining whether the wireless network is in range further based on the RSSI value associated with the message.
16. A playback device comprising:
one or more amplifiers configured to drive one or more speakers;
one or more network interface components for communicating over a first wireless network using a first communication protocol and communicating over a second wireless network using a second communication protocol, wherein the one or more network interface components comprise a network circuit configured to:
determine whether the second wireless network is within range of the playback device; and
output a signal based on a determination that the second wireless network is within range;
at least one non-transitory computer-readable medium;
one or more processing components comprising a first processor and a second processor, wherein the second processor has a plurality of power states including a first power state, a second power state, and a third power state, and wherein the second processor consumes more power in the second power state than in the first power state; and
program instructions stored on the at least one non-transitory computer-readable medium that are executable by the one or more processing components such that the playback device is configured to:
receive first audio content from a first computing device via the first wireless network;
play, via the one or more amplifiers and the one or more speakers, the first audio content using the first processor;
detect, by the one or more processing components, the output signal from the one or more network interface components;
based on detection of the output signal from the one or more network interface components;
cause the second processor to transition from the first power state to the second power state;
after causing the processor to transition from the first power state to the second power state, communicate with a second computing device over the wireless network; and
after communicating with the second computing device over the wireless network, cause the second processor to transition from the second power state to the third power state;
while the second processor is in the third power state, (a) receive, via the wireless network, a first command, and (b) based on the first command, cause the second processor to transition from the third power state to the second power state; and
while the second processor is in the second power state:
receive a second command, and
based on the second command, (i) obtain, over the second wireless network, second audio content via the one or more network interface components using the second processor and (ii) play, via the one or more amplifiers and the one or more speakers, the second audio content.
17. The playback device of claim 16 , wherein the first communication protocol is a BLUETOOTH protocol and wherein the second communication protocol is an IEEE 802.11 protocol.
18. The playback device of claim 16 , wherein the program instructions that are executable by the one or more processing components such that the playback device is configured to receive the second command comprise program instructions that are executable by the one or more processing components such that the playback device is configured to receive the second command while playing the first audio content.
19. The playback device of claim 16 , further comprising program instructions stored on the at least one non-transitory computer-readable medium that are executable by the one or more processing components such that the playback device is configured to: based on receipt of the second command, stop playback of the first audio content.
20. The playback device of claim 16 , wherein the program instructions that are executable by the one or more processing components such that the playback device is configured to receive the second command comprise program instructions that are executable by the one or more processing components such that the playback device is configured to receive the second command from the second computing device.