# US 10,484,812 B2 · Speaker system and signal processing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,812 B2 - Document ID: US10484812B2 - Status: Granted - Kind: B2 - Application number: 16/134,953 - Filed: 2018-09-18 - Published: 2019-03-28 - Granted: 2019-11-19 - Earliest claimed: 2017-09-28 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Panasonic Intellectual Property Corporation of America - Inventors: Toshiyuki Matsumura; Atsushi Sakaguchi - Web page: https://patentgrep.com/patent/US10484812B2 ## CPC - H04S 7/303: {Tracking of listener position or orientation} - H04R 3/04: for correcting frequency response - H04R 3/12: for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)} - H04R 5/02: Spatial or constructional arrangements of loudspeakers - 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)} - 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)} - H04S 7/302: {Electronic adaptation of stereophonic sound system to listener position or orientation (H04S7/301 takes precedence)} - H04R 1/403: {loud-speakers} - H04R 2201/403: Linear arrays of transducers - 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: 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 A speaker system has a speaker array including a plurality of first speakers and a first filter array. A peak of the directivity of reproduced sounds output from the speaker array. And the peak being in a direction in which the plurality of first speakers are arranged, is shifted toward a wall surface due to first filter processing performed by the first filter array. ## Claims ### Claim 1 A speaker system comprising: a speaker array including a plurality of first speakers that are linearly placed and each of which receives a first signal that has been processed by first filter processing and amplification processing; a first filter array configured to perform the first filter processing; and a multi-channel amplifier configured to perform the amplification processing, wherein the speaker array is placed in reproduction space that has a wall surface crossing an array direction in which the plurality of first speakers are arranged, a peak of a directivity of reproduced sounds, corresponding to the first signal, that have been output from the speaker array, the peak being in the array direction, is shifted toward the wall surface due to the first filter processing, the plurality of first speakers are equally spaced at intervals of a spacing D, and a distance between the wall surface and the first speaker positioned at an end of the plurality of first speakers on the wall surface side is D/2. ### Claim 2 (depends on 1) The speaker system according to claim 1, wherein the peak appears on the wall surface. ### Claim 3 (depends on 1) The speaker system according to claim 1, wherein the first signal is a bass component of a signal eligible for reproduction; and the speaker system further comprising a frequency filter array configured to divide the signal eligible for reproduction into the first signal and a second signal, which is a treble component of the signal eligible for reproduction, a second filter array configured to perform second filter processing on the second signal, and an adder array configured to perform addition processing in which a fourth signal obtained by performing the second filter processing on the second signal is added to a third signal obtained by performing the first filter processing on the first signal; the multi-channel amplifier configured to perform the amplification processing on the third signal that has undergone the addition processing; each first speaker included in at least part of the plurality of first speakers receives the third signal that have processed by the addition processing and the amplification processing; and a peak of a directivity of reproduced sounds, corresponding to the second signal, that have been output from the at least part of the plurality of first speakers, the peak being in the array direction, appears at a central portion of the speaker array due to the second filter processing. ### Claim 4 (depends on 3) The speaker system according to claim 3, wherein each first speaker included in part of the plurality of first speakers receives the third signal that has processed by the addition processing and the amplification processing, and each first speaker included in another part of the plurality of first speakers receives the third signal that has processed by only the amplification processing, without the addition processing. ### Claim 5 (depends on 4) The speaker system according to claim 4, wherein the first speakers included in the another part of the plurality of first speakers are positioned at both ends of the speaker array in the array direction. ### Claim 6 (depends on 3) The speaker system according to claim 3, wherein each of the plurality of first speakers receives the third signal that has processed by the addition processing and the amplification processing. ### Claim 7 (depends on 3) The speaker system according to claim 3, wherein the speaker array further includes a plurality of second speakers that are linearly placed, each of the plurality of second speakers receives the fourth signal that has processed by the amplification processing performed by the multi-channel amplifier, the at least part of the plurality of first speakers and the plurality of second speakers are alternately placed, and a peak of a directivity of reproduced sounds, corresponding to the second signal, that have been output from the at least part of the plurality of first speakers and the plurality of second speakers, the peak being in the array direction, appears at the central portion of the speaker array due to the second filter processing. ### Claim 8 (depends on 7) The speaker system according to claim 7, wherein the plurality of first speakers are equally spaced at intervals of a spacing D, and the plurality of second speakers are equally spaced at intervals of the spacing D. ### Claim 9 (depends on 1) The speaker system according to claim 1, wherein the speaker array is attached to a ceiling of an automobile. ### Claim 10 (depends on 1) The speaker system according to claim 1, wherein the speaker array is placed on a dashboard of an automobile. ### Claim 11 A signal processing method, executed by a speaker system that includes a speaker array including a plurality of first speakers that are linearly placed and each of which receives a first signal that has been processed by first filter processing and amplification processing, a first filter array configured to perform the first filter processing, and a multi-channel amplifier configured to perform the amplification processing, the method comprising: placing the speaker array in reproduction space that has a wall surface crossing an array direction in which the plurality of first speakers are arranged; and shifting a peak of a directivity of reproduced sounds, corresponding to the first signal, that have been output from the speaker array, the peak being in the array direction, toward the wall surface due to the first filter processing, wherein the plurality of first speakers are equally spaced at intervals of a spacing D, and a distance between the wall surface and the first speaker positioned at an end of the plurality of first speakers on the wall surface side is D/2.