Abstract: Example access control techniques described herein are intended to enable guest access for a media playback system while maintaining security of the media playback system. An example implementation involves a computing device receiving a request to control a media playback system comprising a playback device. After receiving the request, the computing device obtains access to the media playback system. Obtaining access may involve obtaining a first identifier associated with the media playback system, obtaining a second identifier using the first identifier over a wide area network (WAN) with a computing system, and obtaining a token using the second identifier over the WAN with the computing system. The example implementation further involves receiving a request for the media playback system to perform an operation and causing the media playback system to perform the operation using the token.

Abstract: Embodiments disclosed herein include playback devices configured to operate in one or more playback configurations including configurations individual playback devices play back one or more corresponding channels of multichannel audio content. An audio parameter can be determined based on a distance between playback devices. In some examples, the audio parameter comprises a filter such as a low frequency filter that varies based on at least the distance between the playback devices. After the audio parameter is determined, the playback devices can play back audio content according to the determined audio parameter.

Abstract: A first subwoofer may be configured to output multimedia content in synchrony with at least one other playback device and a second subwoofer. The first subwoofer may, based on a received indication of an acoustic characteristic of the at least one other playback device, determine a crossover frequency of (i) the first subwoofer and the second subwoofer and (ii) the at least one other playback device. After determining the crossover frequency, the first subwoofer may output a first tone set and a second tone set in synchrony with the second subwoofer and the at least one other playback device, and after outputting the first tone set and the second tone set, receive, from a controller device, an indication of a selected one of the first tone set or the second tone set. Based on the selected tone set, the first subwoofer may adjust a phase setting of the first subwoofer.

Abstract: Example techniques facilitate calibration of a playback device. An example implementation involves a computing device capturing, via a microphone, data representing multiple iterations of a calibration sound as played by a playback device. The computing device identifies multiple sections within the captured data. Two or more sections represent respective iterations of the calibration sound as played by the playback device. Based on the multiple identified sections, the computing device determines a frequency response of the playback device, the frequency response of the playback device representing audio output by the playback device and acoustic characteristics of an environment around the playback device. Based on the frequency response of the playback device and a target frequency response, the computing device determines one or more parameters of an audio processing algorithm and sends, to the playback device, the one or more parameters of the audio processing algorithm.

Abstract: Techniques are provided for a playback device to play a media item using an audio setting corresponding to the media item and characteristics of the playback device. An example implementation involves a first playback device transmitting, to a first computing device, information indicating one or more characteristics of the first playback device and queue information indicating one or more media items in a playback queue to be played by the first playback device. The example implementation may further involve receiving, from the first computing device, one or more audio settings associated with the one or more media items, the one or more audio settings corresponding to the one or more media items and the one or more characteristics of the first playback device and playing a first media item of the one or more media items according to a first audio setting of the one or more audio settings.

Abstract: An example playback device includes a housing having a front side, a back side, a first end, and a second end. The playback device also includes an IR receiver positioned on the front side of the housing, a first IR emitter positioned on the back side of the housing and oriented such that a first IR signal emitted from the first IR emitter is directed toward the second end of the housing, and a second IR emitter positioned on the back side of the housing and oriented such that a second IR signal emitted from the second IR emitter a) is directed toward the first end of the housing and b) crosses the first IR signal emitted from the first IR emitter. The first and second IR emitters are communicatively coupled to the IR receiver within the housing and configured to retransmit an IR control signal received by the IR receiver.

Abstract: A computing device may broadcast a first message via a wireless interface while operating according to a first network topology. After broadcasting the first message, the computing device may receive the first message via a wired interface. Based on receiving the first message via the wired interface, the computing device may broadcast a second message indicating a second network topology via the wireless interface. Based on receiving the first message via the wired interface, the computing device may operate according to the second network topology.

Abstract: Embodiments are described herein that provide a dedicated command device that is bonded to a zone player or zone to perform adjustments to the zone player or zone. In an example implementation, a command device receives an instruction to pair with a first playback device that is associated with a group of playback devices that includes the first playback device and at least one additional playback device. The group of playback devices is associated with at least one group variable controlling playback by the playback devices of the group. The command device receives an input to adjust a first group variable of the at least one group variable and transmits, via a wireless communications interface, a command that causes an adjustment of the first group variable for the group of playback devices.

Abstract: Example techniques may involve calibration with multiple recording devices. An implementation may include a mobile device receiving data indicating that a calibration sequence for multiple playback devices has been initiated in a venue. The mobile device displays a prompt to include the first mobile device in the calibration sequence for the multiple playback devices and a particular selectable control that, when selected, includes the first mobile device in the calibration sequence. During the calibration sequence, the mobile device records calibration audio as played back by the multiple playback devices and transmits data representing the recorded calibration audio to a computing device.

Abstract: Systems and methods for media playback via a media playback system include (i) capturing a voice input comprising a request for media content, (ii) receiving information derived at least from the request for media content, (iii) requesting and receiving information from at least one remote computing device associated with a first media content service and at least one remote computing device associated with a second media content service, wherein (a) the information identifies first media content available via the first media content service for playback and identifies second media content available via the second media content service for playback, and (b) the first and second media content are related to the requested media content, and (iv) after receiving at least one of the first information and the second information, (a) selecting the first media content instead of the second media content, and (b) playing back the first media content.

Abstract: In one example, a zone player may include a network interface, at least one processor, a non-transitory computer-readable medium, and program instructions stored on the non-transitory computer-readable medium that may be executable by the at least one processor such that the zone player is configured to receive an instruction to change a volume setting of the zone player to a requested volume level; in response to receiving the instruction to change the volume setting of the zone player to the requested volume level, adjust the volume setting of the zone player to an adapted volume level that is lower than the requested volume level; and after adjusting the volume setting of the zone player to the adapted volume level, send an indication that the volume setting of the zone player has been adjusted to the requested volume level rather than the adapted volume level.

Abstract: Systems and methods for managing playback devices in accordance with embodiments of the invention are illustrated. One embodiment includes a method for modifying a system that includes several devices. The method includes steps for measuring a first signal pattern for wireless signals between the several devices, measuring a second signal pattern for the wireless signals after measuring the first signal pattern between the several devices, determining an updated state of the system based on a difference between the second signal pattern and the first signal pattern, and modifying state variables of one or more devices of the playback system based on the determined updated state.

Abstract: Systems and methods for maintaining voice assistant persistence across multiple network microphone devices are described. In one example, first and second NMDs each identify a wake word based on detected sound, and are each transitioned from an inactive state to an active state in which the NMD captures and transmits sound data over a network interface. The first NMD is selected over the second NMD to output a first response, and both NMDs remain in the active state to further capture and transmit sound data. After further capturing and transmitting of sound data, the second NMD is selected over the first NMD to output a second response. After a predetermined time, one or both of the NMDs are transitioned back to the inactive state. The selection of one NMD over another for outputting a response can be based at least in part on user location information.

Abstract: Examples disclosed herein relate to playback device calibration. A calibration state variable may represent a calibration state of a playback device. A control device may display an indications of the calibration state. For instance, in a first instance, the control device may display an indication that a first playback device is in an uncalibrated state. Further, in a second instance, the control device may display an indication that the first playback device is in an calibrated state, perhaps after instructing the first playback device to initiate calibration.

Abstract: A first playback device may include at least one battery, a network interface, at least one processor, a non-transitory computer-readable medium, and program instructions stored on the non-transitory computer-readable medium. The program instructions may be executable by the at least one processor such that the first playback device is configured to (i) receive an instruction to operate as a group coordinator of a synchrony group, (ii) determine a value of a battery state variable of the at least one battery, (iii) based on the value of the battery state variable of the at least one battery, select a second playback device from one or more other members of the synchrony group to operate as the group coordinator of the synchrony group, and (iv) cause the second playback device to operate as the group coordinator of the synchrony group.

Abstract: Example techniques may involve controlling a passive radiator. An implementation may include a device receiving, via a network interface, audio content and generating an audio signal representing the audio content. Generating the audio signal involves 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, the device detects, via a sensor, clipping of the speaker driver and generates a feedback signal based on the detected clipping of the speaker driver. The device adjusts the forward prediction model based on the generated feedback signal.

Abstract: In an example implementation, a method may involve, while a first zone and a second zone of a media playback system are playing back respective media, receiving data indicating the occurrence of a first trigger condition. The method may also involve, based on the received data, modifying respective volume limits of the first zone and the second zone, wherein modifying the volume limit causes first volume levels that exceed the second limit to be reduced to respective second volume levels that are at or below the second limit. The method may also involve receiving data indicating the occurrence of a second trigger condition. The method may further involve, based on the received data, modifying the respective volume limits of the first zone and the second zone from the second limit to the first limit.

Abstract: Systems and methods for determining and adapting to changes in microphone performance of playback devices are disclosed herein. In one example, an audio input is received at an array of individual microphones of a network microphone device. Output microphone signals are generated from each of the individual microphones based on the audio input. The output microphone signals are analyzed to detect a trigger event. After detecting the trigger event, the output microphone signals are compared to detect aberrant behavior of one or more of the microphones. Optionally, corrective actions can be taken or suggested based on the detection of aberrant behavior of one or more microphones.

Abstract: 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.

Abstract: Playback devices comprising a network interface, an optional speaker(s), and one or more processors are disclosed herein. In some embodiments, the playback device is configured to communicate with a computing system that stores configuration data corresponding to each of a plurality of users. The playback device detects one or more users near the playback device and retrieves user configuration data corresponding to each of the one or more detected users, and thereafter, uses the user configuration data of the one or more detected users to process voice commands, play media content, and/or perform other voice and/or media related functions.