# US 10,375,497 B2 · Dynamically changing master audio playback device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,497 B2 - Document ID: US10375497B2 - Status: Granted - Kind: B2 - Application number: 16/155,090 - Filed: 2018-10-09 - Published: 2019-02-07 - Granted: 2019-08-06 - Earliest claimed: 2016-07-18 - Assignees: Bose Corporation - Applicants: Bose Corporation - Inventors: Trevor Lai; Gregg Michael Duthaler; Michael Elliot; Matthew Smith; Debasmit Banerjee; Michael Malone - Web page: https://patentgrep.com/patent/US10375497B2 ## CPC - H04S 3/008: {in which the audio signals are in digital form, i.e. employing more than two discrete digital channels (data reduction aspects thereof based on psychoacoustics G10L19/02)} - G06F 3/165: {Management of the audio stream, e.g. setting of volume, audio stream path} - H04L 65/1069: Session establishment or de-establishment - H04L 65/611: for multicast or broadcast (systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06) - H04L 65/613: for the control of the source by the destination (control signals issued by the client directed to the server or network components specially adapted for selective content distribution H04N21/637) - H04L 67/06: specially adapted for file transfer, e.g. file transfer protocol [FTP] - H04L 67/104: Peer-to-peer [P2P] networks - H04R 2227/005: Audio distribution systems for home, i.e. multi-room use - H04R 2420/07: Applications of wireless loudspeakers or wireless microphones - H04S: STEREOPHONIC SYSTEMS - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A method for dynamically changing the master audio playback device of a set that includes at least two audio playback devices, wherein one audio playback device of the set is a set master audio playback device that controls the play of audio data by at least one other slave audio playback device of the set. A first slave audio playback device receives its selection as a new recipient of audio data and, in response, the first slave audio playback device is designated as a new set master audio playback device and the set master audio playback device is designated as a new slave audio playback device. The new set master audio playback device controls the play of audio by the new slave audio playback device. ## Claims ### Claim 1 An audio playback device that is adapted to become the new set master audio playback device of a set comprising at least two audio playback devices, wherein one audio playback device of the set is an original set master audio playback device that is configured to receive audio data from an audio data source and send the received audio data to at least one other slave audio playback device of the set, wherein the at least one other slave audio playback device of the set is configured to receive audio data only from the master audio playback device and not from the audio data source, the device comprising: a digital-to-analog converter configured to receive an audio stream comprising a digital representation of audio content via a network and convert the audio stream to analog form; an electro-acoustic transducer; a network interface; and a processor coupled to the digital-to-analog converter, the electro-acoustic transducer, and the network interface, the processor configured to: receive the selection of the audio playback device as a new recipient of audio data from the audio data source; and in response to receiving the selection of the audio playback device as the new recipient of audio data from the audio data source, designate the audio playback device as the new set master audio playback device, wherein the new set master audio playback device is configured to receive audio data from the audio data source and send the received audio data to the set slave audio playback devices, wherein the original set master audio playback device is designated as a slave audio playback device, and wherein the slave audio playback devices are configured to receive audio data only from the new set master audio playback device and not from the audio data source. ### Claim 2 (depends on 1) The audio playback device of claim 1, wherein the set comprises at least three audio playback devices. ### Claim 3 (depends on 1) The audio playback device of claim 1, wherein the set comprises a group comprising at least two group audio playback devices, wherein the group has one group master audio playback device and at least one group slave audio playback device, where the group master audio playback device is configured to control the play of audio by the at least one group slave audio playback device. ### Claim 4 (depends on 3) The audio playback device of claim 3, wherein the group comprises a left-right stereo pair of audio playback devices. ### Claim 5 (depends on 3) The audio playback device of claim 3, wherein the group comprises multiple surround sound audio playback devices. ### Claim 6 (depends on 3) The audio playback device of claim 3, wherein the audio playback device comprises a group slave audio playback device. ### Claim 7 (depends on 6) The audio playback device of claim 6, wherein the audio playback device is designated as both the new set master audio playback device and the new group master audio playback device. ### Claim 8 (depends on 7) The audio playback device of claim 7, wherein the new set master audio playback device is configured to distribute audio data to all other audio playback devices of the set, and wherein the group master audio playback device is configured to control the play of audio by all group slave audio playback devices. ### Claim 9 (depends on 1) The audio playback device of claim 1, wherein the set master is configured to control the play of audio data that originates from a first audio data source, and the selection of the new recipient of audio data from the audio data source comprises selection of audio data from a second audio data source that differs from the first audio data source, and the new set master device is configured to control the play of audio data from the second audio data source. ### Claim 10 (depends on 9) The audio playback device of claim 9, wherein the second audio data source comprises a Bluetooth audio data stream from a Bluetooth-enabled source device. ### Claim 11 (depends on 10) The audio playback device of claim 10, wherein Bluetooth audio data is distributed by the new set master audio playback device to all set slave audio playback devices. ### Claim 12 (depends on 11) The audio playback device of claim 11, wherein the audio data is distributed to the set slave audio playback devices by one of Bluetooth, WiFi, and via a local access point. ### Claim 13 (depends on 9) The audio playback device of claim 9, wherein the second audio data source comprises an auxiliary audio data input. ### Claim 14 (depends on 9) The audio playback device of claim 9, wherein the audio playback device comprises a user interface comprising a user-operated switch that when operated initiates a Bluetooth connection between the audio playback device and the second audio data source.