# US 11,445,291 B2 · Noise-reducing earphone with adjustable voice

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- Number: US 11,445,291 B2
- Document ID: US11445291B2
- Status: Granted
- Kind: B2
- Application number: 17/223,031
- Filed: 2021-04-06
- Published: 2021-07-22
- Granted: 2022-09-13
- Earliest claimed: 2019-03-20
- Assignees: Innovation Sound Technology Co., Ltd.
- Applicants: Innovation Sound Technology Co., Ltd.
- Inventors: Shun Ming Yuen; Wai Yin Mung; Shui Shing Choi; Ka Ming Wu
- Web page: https://patentgrep.com/patent/US11445291B2

## CPC

- H04R 1/1083: {Reduction of ambient noise (active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06)}
- H04R 1/08: Mouthpieces; {Microphones;} Attachments therefor
- H04R 1/1016: {Earpieces of the intra-aural type}
- H04R 1/1025: Accumulators specially adapted for earpieces; Arrangements specially adapted for charging thereof
- H04R 1/1041: {Mechanical or electronic switches, or control elements (switches in general H01H)}
- H04R 1/1075: {Mountings of transducers in earphones or headphones}
- H04R 2420/07: Applications of wireless loudspeakers or wireless microphones
- 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

The application belongs to the field of earphone technology, and discloses a type of noise-reducing earphones with adjustable voice. An audio processor processes voice signals. After a digital signal processor (DSP) completes noise reduction, the signals return to the audio processor, where two signals are combined, through another signal wire. Then the signals are transmitted to a digital-to-analog converter (DAC) that transmits the signals to an acoustic amplifier, where the signals are transmitted to a speaker to realize the adjustment of voice.

## Claims

### Claim 1

A type of noise-reducing earphones with adjustable voice, wherein it comprises:
a rubber shell (1), inside which a main board (4) is fixed; a circuit board (5), a speaker (6) and a battery (9) attached on one side of the main board (4) in order from top to bottom; a microphone (3) and keys (2) fixed on the other side of the main board (4) in order from top to bottom;
an in-ear rubber shell (7), one end of which is fixed with the rubber shell (1), and the other end of which is fixed with a rubber earplug (8) for being inserted into inner ear canal;
the upper part of the circuit board (5) being soldered with a Bluetooth circuit (10), an micro-control unit (MCU) (11), a digital signal processor (12), a sound effect encoder (13) and an acoustic amplifier (14); the MCU (11) connected with the Bluetooth circuit (10) via cables, and also with the digital signal processor (12) for noise reduction; the digital signal processor (12) respectively connected with the sound effect encoder (13) through two signal wires; the sound effect encoder (13) connected to the speaker (6) through the acoustic amplifier (14), and also to the microphone (3) used for collecting external sound through cables; the microphone (3) transmitting signals to the sound effect encoder (13), which is connected to the MCU (11) through cables; the MCU (11) and the key (2) used as a switch being connected by cables;
the sound effect encoder (13) consisting of the acoustic amplifier (14), a DAC (15) that converts digital signals to analog signals, an audio processor (16), and an analog signal converter (17) that converts analog signals to digital signals, and a preamplifier (18) that amplifies signals received by the microphone, and transmits them through cables to the analog signal converter (17), which is connected via cables to the audio processor (16), where the digital signals are processed under the control of the MCU (11) through Bluetooth; the audio processor (16) being connected to the DAC (15), which is connected to the acoustic amplifier (14) via cables.

### Claim 2 (depends on 1)

The noise-reducing earphone with adjustable voice according to claim 1, wherein the microphone (3) is connected to the preamplifier (18) via cables.

### Claim 3 (depends on 1)

The noise-reducing earphone with adjustable voice according to claim 1, wherein the acoustic amplifier (14) is connected with the speaker (6) through cables.

### Claim 4 (depends on 1)

The noise-reducing earphone with adjustable voice according to claim 1, wherein the digital signal processor (12) is respectively connected with the audio processor (16) through two signal wires.