# US 12,598,443 B2 · System and method of providing faded audio experience during transition between environments > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,598,443 B2 - Document ID: US12598443B2 - Status: Granted - Kind: B2 - Application number: 18/339,950 - Filed: 2023-06-22 - Published: 2024-01-04 - Granted: 2026-04-07 - Earliest claimed: 2022-06-30 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Soenke Pelzer; David E. Romblom; Kacper Kosikowski; Dirk Schroeder - Web page: https://patentgrep.com/patent/US12598443B2 ## CPC - H04S 7/305: {Electronic adaptation of stereophonic audio signals to reverberation of the listening space (H04S7/301 takes precedence)} - H04S: STEREOPHONIC SYSTEMS ## Abstract An audio system and a method of providing a faded audio experience during a transition from a first audio experience to a second audio experience, is described. The first audio experience can include playback of an audio signal spatialized using a first space impulse response that is generated by the audio system. The second audio experience includes playback of the audio signal spatialized using a second space impulse response that is received by the audio system. The audio system generates a hybrid space impulse response based on the first space impulse response and the second space impulse response. During the transition between audio experiences, the hybrid space impulse response is used to spatialize the audio signal to create the faded audio experience. Other aspects are also described and claimed. ## Claims ### Claim 1 A method, comprising: generating, by one or more processors of an audio system, a first space impulse response of a first environment; receiving a second space impulse response of a second environment; initiating a transition from a first audio experience to a second audio experience, wherein the first audio experience includes playback of an audio signal spatialized using the first space impulse response, and wherein the second audio experience includes playback of the audio signal spatialized using the second space impulse response; generating, in response to initiating the transition, a hybrid space impulse response based on the first space impulse response and the second space impulse response; and spatializing the audio signal using the hybrid space impulse response to generate a faded audio experience during the transition from the first audio experience to the second audio experience. ### Claim 2 (depends on 1) The method of claim 1, wherein initiating the transition includes adjusting a user-controllable setting of the audio system. ### Claim 3 (depends on 1) The method of claim 1, wherein an acoustic event within the first environment has associated first event parameters, wherein the acoustic event within the second environment has associated second event parameters, and wherein the faded audio experience includes the acoustic event having associated faded event parameters. ### Claim 4 (depends on 3) The method of claim 3, wherein the first event parameters, second event parameters, and faded event parameters include respective one or more of a time of arrival, a direction of arrival, or a level of the acoustic event. ### Claim 5 (depends on 4) The method of claim 4, wherein generating the hybrid space impulse response includes: determining a first value of an event parameter of the first event parameters; determining a second value of the event parameter of the second event parameters; and generating a faded value of the event parameter of the faded event parameters, wherein the faded value is between the first value and the second value. ### Claim 6 (depends on 5) The method of claim 5, wherein the faded value of the event parameter is based on the direction of arrival of the acoustic event. ### Claim 7 (depends on 1) The method of claim 1, wherein the first space impulse response, the second space impulse response, and the hybrid space impulse response are encoded in metadata associated with the audio signal. ### Claim 8 (depends on 7) The method of claim 7, wherein the metadata includes a list of acoustic events within a predetermined frequency band. ### Claim 9 (depends on 1) The method of claim 1, wherein spatializing the audio signal includes: convolving the audio signal with the hybrid space impulse response to generate a spatial input signal; and driving, by the one or more processors, a speaker of the audio system with the spatial input signal to render a spatialized sound. ### Claim 10 (depends on 1) The method of claim 1, wherein the first environment is a mixed reality environment, and wherein the second environment is a virtual reality environment, or wherein the first environment is the virtual reality environment, and wherein the second environment is the mixed reality environment. ### Claim 11 (depends on 1) The method of claim 1, wherein the first environment is a mixed reality environment, and wherein the second environment is a second mixed reality environment, or wherein the first environment is a virtual reality environment, and wherein the second environment is a second virtual reality environment. ### Claim 12 (depends on 1) The method of claim 1, wherein the faded audio experience is free of comb filtering. ### Claim 13 An audio system, comprising: a memory configured to store a second space impulse response of a second environment; and one or more processors configured to: generate a first space impulse response of a first environment, initiate a transition from a first audio experience to a second audio experience, wherein the first audio experience includes playback of an audio signal spatialized using the first space impulse response, and wherein the second audio experience includes playback of the audio signal spatialized using the second space impulse response, generate, in response to initiating the transition, a hybrid space impulse response based on the first space impulse response and the second space impulse response, and spatialize the audio signal using the hybrid space impulse response to generate a faded audio experience during the transition from the first audio experience to the second audio experience. ### Claim 14 (depends on 13) The audio system of claim 13, wherein initiating the transition includes adjusting a user-controllable setting of the audio system. ### Claim 15 (depends on 13) The audio system of claim 13, wherein an acoustic event within the first environment has an associated first event parameter, wherein the acoustic event within the second environment has an associated second event parameter, wherein the faded audio experience includes the acoustic event having an associated faded event parameter, and wherein a faded value of the associated faded event parameter is between a first value of the associated first event parameter and a second value of the associated second event parameter. ### Claim 16 (depends on 13) The audio system of claim 13, wherein the first environment is a mixed reality environment, and wherein the second environment is a virtual reality environment, or wherein the first environment is the virtual reality environment, and wherein the second environment is the mixed reality environment. ### Claim 17 (depends on 13) The audio system of claim 13, wherein the first audio experience includes an acoustic event having an associated first event parameter, wherein the second audio experience includes the acoustic event having an associated second event parameter, wherein the faded audio experience includes the acoustic event having an associated faded event parameter, and wherein a faded value of the associated faded event parameter is between a first value of the associated first event parameter and a second value of the associated second event parameter. ### Claim 18 (depends on 1) The method of claim 1, wherein the first space impulse response comprises a first set of reverberation qualities of the first environment, and wherein the second space impulse response comprises a second set of reverberation qualities of the second environment. ### Claim 19 A non-transitory machine-readable medium having instructions stored therein which when executed by at least one processor of an audio system causes the audio system to: initiate a transition from a first audio experience to a second audio experience, wherein the first audio experience includes playback of an audio signal spatialized using a first space impulse response of a first environment, and wherein the second audio experience includes playback of the audio signal spatialized using a second space impulse response of a second environment; generate, in response to initiating the transition, a third space impulse response by combining the first space impulse response and the second space impulse response; and spatialize the audio signal using the third space impulse response to generate a faded audio experience during the transition from the first audio experience to the second audio experience. ### Claim 20 (depends on 19) The non-transitory machine-readable medium of claim 19, wherein the instructions to initiate the transition comprises instructions to adjust a user-controllable setting of the audio system.