# US 11,309,858 B2 · Method for inducing brainwaves by sound and sound adjusting device

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- Number: US 11,309,858 B2
- Document ID: US11309858B2
- Status: Granted
- Kind: B2
- Application number: 17/102,737
- Filed: 2020-11-24
- Published: 2021-07-15
- Granted: 2022-04-19
- Earliest claimed: 2020-01-14
- Assignees: Pixart Imaging Inc.
- Applicants: PixArt Imaging Inc.
- Inventors: Kuan-Li Chao; Kuo-Wei Kao; I-Ting Lee; Wei-Lin Chang; Wei-Ren Lan; Kuo-Ping Yang
- Web page: https://patentgrep.com/patent/US11309858B2

## CPC

- H03G 7/06: having semiconductor devices
- H04R 5/02: Spatial or constructional arrangements of loudspeakers
- 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 1/005: {For headphones}
- H04S 1/007: {in which the audio signals are in digital form (data reduction aspects thereof based on psychoacoustics G10L19/02)}
- H03G 3/00: Gain control in amplifiers or frequency changers
- H04S 2400/13: Aspects of volume control, not necessarily automatic, in stereophonic sound systems
- H03G: CONTROL OF AMPLIFICATION
- 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

A method for inducing brain waves by sound has the following steps: receiving a first channel input signal and a second channel input signal; adjusting a volume gain of the first channel input signal to form a first channel output signal, wherein a format of the volume gain of the first channel output signal is a first wave format; adjusting a volume gain of the second channel input signal to form a second channel output signal, wherein a format of the volume gain of the second channel output signal is a second wave format, wherein there is a phase difference between the first wave format and the second wave format, wherein the formats of the first wave format and the second wave format are the same; outputting the first channel output signal to a first speaker; and outputting the second channel output signal to a second speaker.

## Claims

### Claim 1

A brainwave induced sound generating method, applied to a sound adjusting device, the sound adjusting device having a processor, and being signally connected to a speaker device, the speaker device comprising a first speaker and a second speaker, the method comprising the steps of:
receiving a first channel input signal and a second channel input signal;
adjusting a volume gain of the first channel input signal to form a first channel output signal, wherein a formal of the volume gain of the first channel output signal is in a first wave format;
adjusting a volume gain of the second channel input signal to form a second channel output signal, wherein a formal of the volume gain of the second channel output signal is in a second wave format, wherein the type of the first wave format is the same as that of the second wave format; and
outputting the first channel output signal to a first speaker, and outputting the second channel output signal to the speaker device and playing through the second speaker, wherein a maximum of the volume gain of the first channel output signal is M1, a minimum of the volume gain of the first channel output signal is M2, and −200 dbFS≤M1−M2≤0 dbFS; the maximum of the volume gain of the second channel output signal is M1, the minimum of the volume gain of the second channel output signal is M2, and −200 dbFS≤M1−M2≤0 dbFS.

### Claim 2 (depends on 1)

The brainwave induced sound generating method as claimed in claim 1, wherein the method of adjusting the volume gain of the first channel input signal and the volume gain of the second channel input signal is: selecting a specific frequency band to generate brainwave induced sound for volume gain adjustment, where the specific frequency band includes the full frequency 20 Hz to 20000 Hz, the low frequency 20 Hz to 160 Hz, the intermediate frequency 160 Hz to 2560 Hz, the high frequency 2560 Hz to 20000 Hz or other specific frequency bands.

### Claim 3 (depends on 1)

The brainwave induced sound generating method as claimed in claim 1, wherein the first wave format and the second wave format comprise sine wave, triangle wave, square wave, trapezoidal wave, asymmetric wave and other wave formats.

### Claim 4 (depends on 1)

The brainwave induced sound generating method as claimed in claim 1, wherein there is a phase difference between the first wave format and the second wave format.

### Claim 5 (depends on 4)

The brainwave induced sound generating method as claimed in claim 4, wherein the phase difference is 0° to 360°.

### Claim 6 (depends on 4)

The brainwave induced sound generating method as claimed in claim 4, wherein the frequency range of the first wave format is between 0 Hz and 10000 Hz, and the frequency range of the second wave format is between 0 Hz and 10,000 Hz.

### Claim 7

A sound adjusting device, which is signally connected with a speaker device, wherein the speaker device comprising a first speaker and a second speaker, the sound adjusting device comprising:
a signal input terminal, used for receiving first channel input signal and a second channel input signal;
a sound processing unit, which is electrically connected to the signal input terminal, the sound processing unit comprising:
a sound adjustment module, which is used for adjusting a volume gain of the first channel input signal to form a first channel output signal, wherein a formal of the volume gain of the first channel output signal is in a first wave format; the sound adjustment module adjusting a volume gain of the second channel input signal to form a second channel output signal, wherein a formal of the volume gain of the second channel output signal is in a second wave format, wherein the type of the first wave format is the same as that of the second wave format; and
a signal output terminal, which is electrically connected to the sound processing unit for outputting the first channel output signal to the speaker device and playing through the first speaker, and outputting the second channel output signal to the speaker device and playing through the second speaker, wherein a maximum of the volume gain of the first channel output signal is M1, a minimum of the volume gain of the first channel output signal is M2, and −200 dbFS≤M1−M2≤0 dbFS; the maximum of the volume gain of the second channel output signal is M1, the minimum of the volume gain of the second channel output signal is M2, and −200 dbFS≤M1−M2≤0 dbFS.

### Claim 8 (depends on 7)

The sound adjusting device as claimed in claim 7, wherein the method of adjusting the volume gain of the first channel input signal and the volume gain of the second channel input signal is: selecting a specific frequency band to generate brainwave induced sound for volume gain adjustment, such as selecting the full frequency 20 Hz to 20000 Hz, the low frequency 20 Hz to 160 Hz, the intermediate frequency 160 Hz to 2560 Hz, the high frequency 2560 Hz to 20000 Hz or other specific frequency bands.

### Claim 9 (depends on 7)

The sound adjusting device as claimed in claim 7, wherein the first wave format and the second wave format comprise sine wave, triangle wave, square wave, trapezoidal wave, asymmetric wave and other wave formats.

### Claim 10 (depends on 7)

The sound adjusting device as claimed in claim 7, wherein there is a phase difference between the first wave format and the second wave format.

### Claim 11 (depends on 10)

The sound playing device as claimed in claim 10, wherein the phase difference is 0° to 360°.

### Claim 12 (depends on 7)

The sound adjusting device as claimed in claim 7, wherein the frequency of the first wave format is between 0 Hz and 10,000 Hz, and the frequency of the second wave format is between 0 Hz and 10,000 Hz.