# US 2018/0027348 A1 · Method and apparatus for evaluating audio device, audio device and speaker device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0027348 A1 - Document ID: US20180027348A1 - Status: Published application - Kind: A1 - Application number: 15/541,690 - Filed: 2016-01-07 - Published: 2018-01-25 - Earliest claimed: 2015-01-09 - Inventors: Setuo ANIYA - Web page: https://patentgrep.com/patent/US20180027348A1 ## CPC - H04R 29/002: {Loudspeaker arrays} - G10K 15/00: Acoustics not otherwise provided for - G10L 25/51: for comparison or discrimination - H04R 1/02: Casings; Cabinets {; Supports therefor;} Mountings therein (H04R1/28 takes precedence {; attachments for microphones H04R1/08; mounting of transducers in earpieces H04R1/1075}) - H04R 1/025: {Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture} - H04R 1/24: Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges - H04R 1/288: {for loudspeaker transducers} - H04R 3/00: Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F) - H04R 3/04: for correcting frequency response - H04R 3/14: Cross-over networks - 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 29/001: {for loudspeakers (H04R29/007 takes precedence)} - H04R 1/26: Spatial arrangements of separate transducers responsive to two or more frequency ranges - H04R 3/12: for distributing signals to two or more loudspeakers {(specially adapted for hearing aids H04R25/407)} - H04R 2201/028: Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure (H04R2499/10 takes precedence; Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer H04R2205/026) - 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) - 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 - G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING ## Abstract A method and apparatus for evaluating audio device for evaluating performance of an audio device by inputting into the audio device an audio signal having a waveform in which a plurality of waves with different frequency components are superimposed, comparing the sound waveform before the input and the sound waveform after the input, and finding the degree of conformity therebetween. An audio device is characterized in that, with sound field correction as a precondition, low-pitch ranges can be reproduced by using numerous small-diameter speakers, a single one of which is insufficient to reproduce low-pitch ranges despite good group delay characteristic, and outstanding waveform reproducibility can be achieved by covering the periphery of the speakers with sound-absorbent material so as to remove noise emitted by surfaces other than the front surface of cone paper. ## Claims ### Claim 1 A method for evaluating an audio device, comprising: inputting into an audio device an audio signal having a waveform of recorded sound such as sound of string instruments, wind instruments, percussion instruments, vocal sound or the like which is recorded on a source such as CD or the like, comparing a sound waveform before input and the sound waveform after output, and evaluating a performance of the audio device based on a degree of conformity of the two waveforms. ### Claim 2 A device for evaluating an audio device, comprising: a measuring audio signal output device that outputs an audio signal to be measured having a waveform of recorded sound such as sound of string instruments, wind instruments, percussion instruments, vocal sound or the like which is recorded on a source such as CD or the like; and a waveform comparison device that compares a waveform of a signal output from an audio device when the audio signal to be measured is output from the measuring audio signal output device and is input to the audio device which is an evaluation target, and a waveform of the audio signal to be measured input into the audio device, and obtains a degree of conformity of the two waveforms. ### Claim 3 A speaker device comprising; a speaker box; a speaker unit which is equipped to this speaker box; a plurality of small-diameter single speaker units in which the single speaker unit alone is insufficient to reproduce a low frequency range; and a sound-absorbent member which covers a part of the speaker box other than a front surface facing a hearing direction of a vibrator such as cone paper or the like which emit a sound of the speaker unit for preventing emission of noise and emitting only a signal sound, when a sound emitted from the front surface of the vibrator such as cone paper or the like of the speaker unit, is called the signal sound and a sound other than the signal sound including a sound emitted from a back surface of the vibrator such as cone paper or the like and a sound generated from an object such as the speaker box or the like which is in contact with the speaker unit and vibrated accompanied by a vibration of the vibrator, is called a noise. ### Claim 4 A multi-way type speaker device: wherein a reproduction frequency range is divided into a plurality of frequency ranges and each frequency range is reproduced by each separate assigning speaker, and comprising: an assigning speaker that reproduces a low frequency range among a plurality of assigning speakers constituting the multi-way type speaker and obtained by setting a single speaker having a small-diameter and ability insufficient to reproduce the low frequency as a single speaker unit and combining a plurality of speaker unit, and a sound-absorbent member which covers a part of the speaker box other than a front surface facing the hearing direction of a vibrator such as cone paper or the like which emit a sound of each unit speaker for preventing emission of noise and emitting only a signal sound, when a sound emitted from the front surface of the vibrator such as cone paper or the like of each unit speaker, is called the signal sound and a sound other than the signal sound including a sound emitted from a back surface of the vibrator such as cone paper or the like and a sound generated from an object such as a speaker box or the like which is in contact with the speaker unit and vibrated accompanied by a vibration of the vibrator, is called a noise. ### Claim 5 (depends on 3) An audio device comprising: an amplification device part which an audio signal from a sound source is input into and performs required processing and amplification of the audio signal; and a speaker device which is connected to the amplification device part and the processed and amplified audio signal is input into and emits this audio signal; wherein the amplification device part includes a correction device which corrects at least one of a group delay characteristic, a frequency characteristic of the audio device or an acoustic characteristic of a room in which the audio device is installed; and the speaker device of claim 3 is used as a speaker device. ### Claim 6 (depends on 4) An audio device comprising: an amplification device part which an audio signal from a sound source is input into and performs required processing and amplification of the audio signal; and a speaker device which is connected to the amplification device part and inputs the processed and amplified audio signal and outputs this audio signal; wherein the amplification device part includes a correction device which corrects at least one of a group delay characteristic, a frequency characteristic of the speaker device or an acoustic characteristic of a room in which the audio device is installed; a channel divider device that divides the audio signal into a plurality of frequency ranges and outputs the audio signal; and a plurality of amplification device which the plurality of divided audio signals are input respectively into, and amplifies and outputs the plurality of divided audio signals respectively; and the speaker device of claim 4 is used as the speaker device. ### Claim 7 (depends on 4) An audio device comprising: an amplification device part which an audio signal from a sound source is input into and performs required processing and amplification of the audio signal; and a speaker device which is connected to the amplification device part and the processed and amplified audio signal is input into and emits this audio signal; wherein the amplification device part includes a correction device which corrects at least one of a group delay characteristic, a frequency characteristic of the audio device or an acoustic characteristic of a room in which the audio device is installed; and the speaker device of claim 4 is used as a speaker device.