# US 2014/0192616 A1 · Electronic device

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- Number: US 2014/0192616 A1
- Document ID: US20140192616A1
- Status: Published application
- Kind: A1
- Application number: 14/238,938
- Filed: 2012-07-31
- Published: 2014-07-10
- Earliest claimed: 2011-08-16
- Assignees: NEC Casio Mobile Communications, Ltd.
- Inventors: Yuichiro Kishinami; Yasuharu Onishi; Motoyoshi Komoda; Yukio Murata; Jun Kuroda; Shigeo Satou
- Web page: https://patentgrep.com/patent/US20140192616A1

## CPC

- G01S 7/52: of systems according to group G01S15/00
- G01S 11/14: using ultrasonic, sonic or infrasonic waves
- G01S 15/02: using reflection of acoustic waves (G01S15/66 takes precedence)
- G10K 11/18: Methods or devices for transmitting, conducting or directing sound (G10K11/02, G10K11/36 take precedence)
- G10K 15/02: Synthesis of acoustic waves (synthesis of speech G10L13/00)
- H04R 2217/03: Parametric transducers where sound is generated or captured by the acoustic demodulation of amplitude modulated ultrasonic waves
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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)

## Abstract

Provided is an electronic device including a modulation unit (22) that modulates a sound signal to a modulation wave for a parametric speaker; an oscillator (12) to which the modulation wave is input; an equalizer (26) that corrects a frequency characteristic of a sound wave that is demodulated by the modulation wave; and a control unit (20) that selects a carrier frequency of the modulation wave and changes setting of the equalizer (26) on the basis of the selected carrier frequency. Thus, it is possible to provide the electronic device capable of correcting the frequency characteristic of the sound wave that is demodulated, for each carrier frequency of the modulation wave.

## Claims

### Claim 1

An electronic device comprising:
a modulation unit that modulates a sound signal to a modulation wave for a parametric speaker;
an oscillator to which the modulation wave is input;
an equalizer that corrects a frequency characteristic of a sound wave that is demodulated by the modulation wave; and
a control unit that selects a carrier frequency of the modulation wave and changes setting of the equalizer on the basis of the selected carrier frequency.

### Claim 2 (depends on 1)

The electronic device according to claim 1, wherein the equalizer corrects the modulation wave to correct the frequency characteristic of the sound wave that is demodulated by the modulation wave.

### Claim 3 (depends on 1)

The electronic device according to claim 1, wherein the equalizer corrects the sound signal to correct the frequency characteristic of the sound wave that is demodulated by the modulation wave.

### Claim 4 (depends on 1)

The electronic device according to claim 1, further comprising:
an imaging unit that images a user and a region around the user; and
a determination unit that determines the presence or absence of a person in the region imaged by the imaging unit,
wherein the control unit selects the carrier frequency on the basis of the presence or absence of a person in the region.

### Claim 5 (depends on 1)

The electronic device according to claim 1, further comprising a distance calculation unit that calculates a distance between a user and the oscillator,
wherein the control unit selects the carrier frequency on the basis of the distance between the oscillator and the user which is calculated by the distance calculation unit.

### Claim 6 (depends on 5)

The electronic device according to claim 5,
wherein the oscillator outputs ultrasound waves for a sensor toward the user, and
wherein the distance calculation unit detects the ultrasound waves for a sensor which are reflected, and detects the distance between the user and the oscillator on the basis of a time between when the ultrasound waves for a sensor are output by the oscillator and when the ultrasound waves are detected.

### Claim 7 (depends on 1)

The electronic device according to claim 1, wherein the control unit selects the carrier frequency corresponding to any one of a fundamental wave, a double wave, and a triple wave of the oscillator.

### Claim 8 (depends on 1)

The electronic device according to claim 1, wherein the electronic device is a portable communication terminal.