# US 12,192,700 B2 · Audio spot system and audio spot forming method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,700 B2 - Document ID: US12192700B2 - Status: Granted - Kind: B2 - Application number: 17/915,438 - Filed: 2020-03-30 - Published: 2023-05-11 - Granted: 2025-01-07 - Earliest claimed: 2020-03-30 - Assignees: Nippon Telegraph and Telephone Corporation - Applicants: Nippon Telegraph and Telephone Corporation - Inventors: Hisatoshi Kasahara; Yuta Ikeguchi; Yusuke Yoshimura; Atsushi Aratake; Shuichi Yanagi; Suguru Oguchi - Web page: https://patentgrep.com/patent/US12192700B2 ## CPC - G10K 15/02: Synthesis of acoustic waves (synthesis of speech G10L13/00) - H04R 1/403: {loud-speakers} - B60W 50/14: Means for informing the driver, warning the driver or prompting a driver intervention - G10K 11/34: using electrical steering of transducer arrays, e.g. beam steering {(constructional aspects B06B1/0607, B06B1/085)} - H04R 1/323: {for loudspeakers (H04R1/34 and H04R1/40 take precedence)} - H04R 3/12: for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)} - H04S 7/302: {Electronic adaptation of stereophonic sound system to listener position or orientation (H04S7/301 takes precedence)} - B60W 2050/143: {Alarm means} - H04R 2217/03: Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves - H04R 2499/13: Acoustic transducers and sound field adaptation in vehicles - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR - 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) - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT - H04S: STEREOPHONIC SYSTEMS ## Abstract An audio spot forming system (S) is an audio spot forming system which transmits an alert sound to a vehicle traveling on a road, the audio spot forming system including a first parametric speaker (1) configured to emit a sideband wave, and a second parametric speaker (2) configured to emit a carrier wave, in which the sideband wave and the carrier wave are caused to intersect with each other on the road to form an audio spot. ## Claims ### Claim 1 An audio spot forming system for transmitting an alert sound to a vehicle traveling on a road, the audio spot forming system comprising: a first parametric speaker configured to emit a sideband wave; and a second parametric speaker configured to emit a carrier wave, wherein the sideband wave and the carrier wave intersect with each other on the road to form an audio spot, wherein the second parametric speaker includes a plurality of second speakers, the plurality of second speakers is arranged along a direction in which the vehicle travels on the road, and a plurality of carrier waves emitted from the plurality of second speakers are each caused to intersect with the sideband wave on the road to form a plurality of audio spots. ### Claim 2 (depends on 1) The audio spot forming system according to claim 1, wherein the first parametric speaker includes a plurality of first speakers, and a plurality of band-division sideband waves emitted from the plurality of first speakers are caused to intersect with the carrier wave in a single region on the road to form a single audio spot. ### Claim 3 (depends on 2) The audio spot forming system according to claim 2, wherein the second parametric speaker is arranged at a position closer to the audio spot than the first parametric speaker. ### Claim 4 (depends on 2) The audio spot forming system according to claim 2, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec]. ### Claim 5 (depends on 1) The audio spot forming system according to claim 1, wherein the second parametric speaker is arranged at a position closer to the audio spot than the first parametric speaker. ### Claim 6 (depends on 5) The audio spot forming system according to claim 5, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec]. ### Claim 7 (depends on 1) The audio spot forming system according to claim 1, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec]. ### Claim 8 (depends on 1) The audio spot forming system according to claim 1, wherein the second parametric speaker is arranged at a position closer to the audio spot than the first parametric speaker. ### Claim 9 (depends on 1) The audio spot forming system according to claim 1, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec]. ### Claim 10 A method for forming an audio spot where an alert sound is transmitted to a vehicle traveling on a road, the method comprising: emitting a sideband wave by a first parametric speaker; emitting a carrier wave by a second parametric speaker; and forming the audio spot by causing the sideband wave and the carrier wave to intersect with each other on the road, wherein the second parametric speaker includes a plurality of second speakers, the plurality of second speakers is arranged along a direction in which the vehicle travels on the road, and a plurality of carrier waves emitted from the plurality of second speakers are each caused to intersect with the sideband wave on the road to form a plurality of audio spots. ### Claim 11 (depends on 10) The method according to claim 10, wherein the first parametric speaker includes a plurality of first speakers, and a plurality of band-division sideband waves emitted from the plurality of first speakers are caused to intersect with the carrier wave in a single region on the road to form a single audio spot. ### Claim 12 (depends on 11) The method according to claim 11, wherein the second parametric speaker is arranged at a position closer to the audio spot than the first parametric speaker. ### Claim 13 (depends on 11) The method according to claim 11, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec]. ### Claim 14 (depends on 10) The method according to claim 10, wherein the second parametric speaker is arranged at a position closer to the audio spot than the first parametric speaker. ### Claim 15 (depends on 14) The method according to claim 14, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec]. ### Claim 16 (depends on 10) The method according to claim 10, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec]. ### Claim 17 (depends on 10) The method according to claim 10, wherein the second parametric speaker is arranged at a position closer to the audio spot than the first parametric speaker. ### Claim 18 (depends on 10) The method according to claim 10, wherein a voice obtained by repeatedly reproducing a minimum character string required to be transmitted to a driver of the vehicle is transmitted as the alert sound, and a length of the audio spot in a direction in which the vehicle travels is set to 2xP [m], where a time period required to reproduce the minimum character string is x [sec] and a travel speed of the vehicle is P [m/sec].