# US 2010/0166197 A1 · Sound corrector, sound measurement device, sound reproducer, sound correction method, and sound measurement method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0166197 A1 - Document ID: US20100166197A1 - Status: Published application - Kind: A1 - Application number: 12/535,382 - Filed: 2009-08-04 - Published: 2010-07-01 - Earliest claimed: 2008-12-26 - Assignees: Kabushiki Kaisha Toshiba - Inventors: Takashi FUKUDA; Toshifumi YAMAMOTO; Norikatsu CHIBA; Shigeyasu IWATA; Yasuhiro KANISHIMA; Kazuyuki SAITO; Yutaka OKI - Web page: https://patentgrep.com/patent/US20100166197A1 ## CPC - H04R 29/00: Monitoring arrangements; Testing arrangements {(for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308)} - 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 According to one embodiment, a sound corrector includes a signal outputter, a response signal, a frequency specifier, a coefficient specifier, a filter, and an outputter. The signal outputter outputs a measurement signal to measure acoustical properties of an object to be measured. The response signal receiver receives a response signal from the object in response to the measurement signal. The frequency specifier specifies a resonant frequency at a resonance peak from the response signal. The coefficient specifier specifies a correction coefficient of a correction filter for reducing the resonant frequency based on the specified resonant frequency. The filter performs filtering on a signal to be output to the object using the correction filter with the correction coefficient. The outputter outputs the signal having undergone the filtering to the object. ## Claims ### Claim 1 A sound corrector comprising: a signal outputter configured to output a measurement signal to measure acoustical properties of an object to be measured; a response signal receiver configured to receive a response signal from the object in response to the measurement signal; a frequency specifier configured to specify a resonant frequency at a resonance peak from the response signal; a coefficient specifier configured to specify a correction coefficient of a correction filter for reducing the resonant frequency based on the resonant frequency; a filter configured to perform filtering on an output signal to be output to the object using the correction filter with the correction coefficient; and an outputter configured to output the output signal to the object. ### Claim 2 (depends on 1) The sound corrector of claim 1, wherein the frequency specifier is configured to further specify a sound pressure level at the resonance peak, the coefficient specifier is configured to specify a propagation time to the object as the correction coefficient, the filter comprising a delay module in which the propagation time is set, and an attenuator configured to represent reflectivity based on the sound pressure level, and the filter is configured such that the signal processed by the delay module and the attenuator is added to the signal without passing through the delay module and the attenuator. ### Claim 3 (depends on 1) The sound corrector of claim 1, further comprising a switch configured to switch between a first operation mode for measuring the acoustical properties of the object and a second operation mode for correcting the output signal, wherein in the first operation mode, the signal outputter, the response signal receiver, the frequency specifier, and the coefficient specifier perform processing, and in the second operation mode, the filter and the outputter perform processing. ### Claim 4 (depends on 1) The sound corrector of claim 1, wherein the signal outputter and the outputter are configured to be identical in configuration, and the response signal receiver is configured to be located at a position except for a node of sound pressure of a standing wave of the measurement signal. ### Claim 5 (depends on 4) The sound corrector of claim 4, wherein the response signal receiver is configured to be located near the signal outputter. ### Claim 6 (depends on 1) The sound corrector of claim 1, wherein the measurement signal is one of a unit pulse, a time stretched pulse, white noise, noise in a band including a measurement band, and a signal containing a plurality of sinusoidal waves including a sinusoidal wave in the measurement band. ### Claim 7 A sound measurement device comprising: a signal outputter configured to output a measurement signal to measure acoustical properties of an object to be measured; a response signal receiver configured to receive a response signal reflected from the object; a frequency specifier configured to specify a resonant frequency at a resonance peak from the response signal; a coefficient specifier configured to specify a correction coefficient of a correction filter for reducing the resonant frequency based on the resonant frequency; and a coefficient outputter configured to output the correction coefficient. ### Claim 8 (depends on 7) The sound measurement device of claim 7, wherein the frequency specifier is configured to further specify a sound pressure level at the resonance peak, and the coefficient specifier is configured to specify a propagation time to the object as the correction coefficient, the sound measurement device further comprising a filter comprising a delay module in which the propagation time is set, and an attenuator configured to represent reflectivity based on the sound pressure level, and the filter is configured such that the signal processed by the delay module and the attenuator is added to the signal without passing through the delay module and the attenuator. ### Claim 9 (depends on 7) The sound measurement device of claim 7, further comprising: a filter configured to perform filtering on the output signal using the correction filter with the correction coefficient; and an outputter configured to output the output signal having undergone the filtering to the object. ### Claim 10 (depends on 9) The sound measurement device of claim 9, wherein the frequency specifier is configured to further specify a sound pressure level at the resonance peak, the coefficient specifier is configured to specify a propagation time to the object as the correction coefficient, the filter comprising a delay module in which the propagation time is set, and an attenuator configured to represent reflectivity based on the sound pressure level at the resonance peak, and the filter is configured such that the signal processed by the delay module and the attenuator is added to the signal without passing through the delay module and the attenuator. ### Claim 11 (depends on 9) The sound measurement device of claim 9, further comprising a switch configured to switch between a first operation mode for measuring the acoustical properties of the object and a second operation mode for correcting the output signal, wherein in the first operation mode, the signal outputter, the response signal receiver, the frequency specifier, and the coefficient specifier perform processing, and in the second operation mode, the filter and the outputter perform processing. ### Claim 12 A sound correction method applied to a sound corrector, the sound correction method comprising: a signal outputter outputting a measurement signal to measure acoustical properties of an object to be measured; a response signal receiver receiving a response signal from the object in response to the measurement signal; a frequency specifier specifying a resonant frequency at a resonance peak from the response signal; a coefficient specifier specifying a correction coefficient of a correction filter for reducing the resonant frequency based on the resonant frequency; a filter performing filtering on an output signal to be output to the object using the correction filter with the correction coefficient; and an outputter outputting the output signal to the object. ### Claim 13 (depends on 12) The sound correction method of claim 12, wherein the frequency specifier further specifying a sound pressure level at the resonance peak, the coefficient specifier specifying a propagation time to the object as the correction coefficient, the filter comprising a delay module in which the propagation time is set, and an attenuator configured to represent reflectivity based on the sound pressure level at the resonance peak, and the filter adding the signal delayed and attenuated by the delay module and the attenuator to the signal without being delayed and attenuated. ### Claim 14 (depends on 12) The sound correction method of claim 12, further comprising a switch switching between a first operation mode for measuring the acoustical properties of the object and a second operation mode for correcting the output signal, wherein in the first operation mode, the signal outputter, the response signal receiver, the frequency specifier, and the coefficient specifier perform processing, and in the second operation mode, the filter and the outputter perform processing.