# US 11,445,320 B1 · Device for processing multi-channel audio signals, method for processing multi-channel audio signals, and computer-readable storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,320 B1 - Document ID: US11445320B1 - Status: Granted - Kind: B1 - Application number: 17/360,251 - Filed: 2021-06-28 - Granted: 2022-09-13 - Earliest claimed: 2021-06-28 - Assignees: Sennheiser electronic GmbH & Co. KG - Applicants: Sennheiser electronic GmbH & Co. KG - Inventors: Johannes Heinrich Kares - Web page: https://patentgrep.com/patent/US11445320B1 ## CPC - H04S 3/002: {Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution (control circuits for electronic adaptation of the sound field H04S7/30)} - H04S 7/302: {Electronic adaptation of stereophonic sound system to listener position or orientation (H04S7/301 takes precedence)} - H04R 5/04: Circuit arrangements, {e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments (combinations of amplifiers H03F3/68; stereophonic systems H04S)} - H04R 2499/13: Acoustic transducers and sound field adaptation in vehicles - H04S 2400/01: Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved - H04S 2400/05: Generation or adaptation of centre channel in multi-channel audio systems - H04S: STEREOPHONIC SYSTEMS - 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 Embodiments of the invention provide for a device and method for processing multi-channel audio signals, the multi-channel audio signals comprising at least a left channel, a right channel, and a center channel. Embodiments of the invention also provide for a non-transitory computer-readable storage medium having stored thereon instructions that when executed on a computer cause the computer to perform the method. ## Claims ### Claim 1 A device for processing multi-channel audio signals that include at least a left channel, a right channel, and a center channel, the device comprising: a center extraction unit adapted for extracting a center signal from the left channel and the right channel, wherein a left remainder signal and a right remainder signal remain; a first summation unit for adding the extracted center signal to the center channel of the multi-channel audio signal to obtain an enhanced center channel; a second summation unit adapted for adding the enhanced center channel to the right remainder signal to obtain an enhanced right channel; a third summation unit adapted for adding the enhanced center channel to the left remainder signal to obtain an enhanced left channel; and outputs for providing the enhanced left channel, the enhanced right channel, and enhanced center channel. ### Claim 2 (depends on 1) The device of claim 1, wherein the center extraction unit is adapted for performing a correlation between the left channel and the right channel of the multi-channel audio signal and for providing correlated portions thereof. ### Claim 3 (depends on 1) The device of claim 1, wherein the center extraction unit is a digital processing unit, and the first, second and third summation units perform digital summation. ### Claim 4 (depends on 1) The device of claim 1, wherein the center extraction unit is a digital processing unit, further comprising a digital-to-analog converter for converting the signals provided by the center extraction unit into analog signals, and wherein the first, second, and third summation units perform analog summation. ### Claim 5 (depends on 1) The device of claim 1, wherein the multi-channel audio signal comprises one or more additional audio channels, the one or more additional audio channels being provided to one or more further speakers to the side of or behind listening positions. ### Claim 6 (depends on 1) A system comprising: a device for processing multi-channel audio signals as set forth in claim 1; at least three speakers, with a first speaker positioned to the left and in front of two listening positions, a second speaker positioned to the right and in front of the two listening positions, and a third speaker positioned substantially in the middle and in front of said two listening positions; wherein the first speaker receives the enhanced left channel, the second speaker receives the enhanced right channel, and the first speaker receives the enhanced center channel. ### Claim 7 A method for processing multi-channel audio signals, the multi-channel audio signals comprising at least a left channel, a right channel, and a center channel, the method comprising: performing a center extraction for the left channel and right channel to obtain an extracted center signal, wherein a left remainder signal and a right remainder signal remain; adding the extracted center signal to the center channel of the multi-channel audio signal to obtain an enhanced center channel; adding the enhanced center channel to the left remainder signal to obtain an enhanced left channel; adding the enhanced center channel to the right remainder signal to obtain an enhanced right channel; and providing the enhanced left channel, the enhanced right channel, and the enhanced center channel for output to respective speakers. ### Claim 8 (depends on 7) The method of claim 7, wherein the enhanced left channel is provided to a first speaker positioned to the left and in front of two listening positions, the enhanced right channel is provided to a second speaker positioned to the right and in front of the two listening positions, and the enhanced center channel is provided to a third speaker positioned substantially in the middle and in front of said two listening positions. ### Claim 9 (depends on 8) The method of claim 8, wherein the two listening positions are two adjacent seats in a car. ### Claim 10 (depends on 9) The method of claim 9, wherein the two adjacent seats are the driver seat and the passenger seat. ### Claim 11 (depends on 7) A non-transitory computer-readable storage medium having stored thereon instructions that when executed on a computer cause the computer to perform a method according to claim 7.