# US 2025/0097643 A1 · Acoustic signal processing apparatus and acoustic 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 2025/0097643 A1 - Document ID: US20250097643A1 - Status: Published application - Kind: A1 - Application number: 18/583,988 - Filed: 2024-02-22 - Published: 2025-03-20 - Earliest claimed: 2023-09-15 - Assignees: Kabushiki Kaisha Toshiba; Toshiba Digital Solutions Corporation - Applicants: Kabushiki Kaisha Toshiba; Toshiba Digital Solutions Corporation - Inventors: Tatsuhiko GOTO - Web page: https://patentgrep.com/patent/US20250097643A1 ## CPC - 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 5/00: Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation - H04S 7/307: {Frequency adjustment, e.g. tone control (H04S7/301 takes precedence)} - H04R 2420/01: Input selection or mixing for amplifiers or loudspeakers - H04S 2400/11: Positioning of individual sound objects, e.g. moving airplane, within a sound field (H04S2420/13 takes precedence) - H04S 2420/07: Synergistic effects of band splitting and sub-band processing - 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) - H04S: STEREOPHONIC SYSTEMS ## Abstract According to an embodiment, an acoustic signal processing apparatus includes processing circuitry. The processing circuitry includes a modulation frequency control unit, frequency shift processing unit, and amplitude control unit. The modulation frequency control unit is configured to control a first modulation frequency based on velocity information indicating a velocity of a sound source. The frequency shift processing unit is configured to perform single-sideband (SSB) modulation on a first acoustic signal in accordance with the first modulation frequency to generate a first modulated acoustic signal. The amplitude control unit is configured to control an amplitude of the first modulated acoustic signal. ## Claims ### Claim 1 An acoustic signal processing apparatus comprising processing circuitry, the processing circuitry comprising: a first modulation frequency control unit configured to control a first modulation frequency based on velocity information indicating a velocity of a sound source; a first frequency shift processing unit configured to perform single-sideband (SSB) modulation on a first acoustic signal in accordance with the first modulation frequency to generate a first modulated acoustic signal; and a first amplitude control unit configured to control an amplitude of the first modulated acoustic signal. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the first modulated acoustic signal is a first acoustic signal whose frequency is shifted by the first modulation frequency. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the velocity information indicates a time change of the velocity, and the first modulation frequency control unit controls the first modulation frequency by converting the velocity of the sound source into a Doppler shift amount. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the processing circuitry further comprises: a splitter configured to branch an input acoustic signal to generate acoustic signals, the acoustic signals including the first acoustic signal and a second acoustic signal; bandpass filters having different passbands and configured to filter the acoustic signals; frequency shift processing units configured to perform the SSB modulation on the acoustic signals that have passed through the bandpass filters to generate modulated acoustic signals; amplitude control units configured to control amplitudes of the modulated acoustic signals; and an adder configured to add the modulated acoustic signals that have undergone amplitude control, and wherein the bandpass filters include a first bandpass filter configured to filter the first acoustic signal, and a second bandpass filter configured to filter the second acoustic signal, and the frequency shift processing units include the first frequency shift processing unit configured to perform the SSB modulation on the first acoustic signal that has passed through the first bandpass filter in accordance with the first modulation frequency to generate the first modulated acoustic signal, and a second frequency shift processing unit configured to perform the SSB modulation on the second acoustic signal that has passed through the second bandpass filter in accordance with a second modulation frequency different from the first modulation frequency to generate a second modulated acoustic signal. ### Claim 5 (depends on 1) The apparatus according to claim 1, wherein the processing circuitry further comprises: a splitter configured to branch an input acoustic signal to generate the first acoustic signal and a second acoustic signal; a bandpass filter having a predetermined passband and configured to filter the first acoustic signal; a band-stop filter configured to perform an operation inverse to the bandpass filter and filter the second acoustic signal; a second amplitude control unit configured to control an amplitude of the second acoustic signal that has passed through the band-stop filter; and an adder configured to add the first modulated acoustic signal that has undergone amplitude control and the second acoustic signal that has undergone amplitude control, and wherein the first frequency shift processing unit performs the SSB modulation on the first acoustic signal that has passed through the bandpass filter in accordance with the first modulation frequency to generate the first modulated acoustic signal. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein the processing circuitry further comprises a parameter setting unit configured to provide a graphical user interface (GUI) used to input the velocity information and amplitude information used for control of the amplitude. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the processing circuitry further comprises a parameter setting unit configured to acquire, from an external apparatus, setting information including the velocity information and amplitude information used for control of the amplitude, which are input to the external apparatus. ### Claim 8 An acoustic signal processing method comprising: controlling a first modulation frequency based on velocity information indicating a velocity of a sound source; performing single-sideband (SSB) modulation on a first acoustic signal in accordance with the first modulation frequency to generate a first modulated acoustic signal; and controlling an amplitude of the first modulated acoustic signal. ### Claim 9 A non-transitory computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, cause the processor to perform a method comprising: controlling a first modulation frequency based on velocity information indicating a velocity of a sound source; performing single-sideband (SSB) modulation on a first acoustic signal in accordance with the first modulation frequency to generate a first modulated acoustic signal; and controlling an amplitude of the first modulated acoustic signal.