Interphone circuit for intelligent conversation noise reduction

Abstract

An intelligent conversation noise reduction interphone circuit comprises an interphone control circuit and a microphone, and further comprises a voice noise reduction chip connected between the microphone and the interphone control circuit, and the voice noise reduction chip comprises an intelligent noise reduction processing circuit connected between the microphone and the interphone control circuit. A power management module is arranged in the voice noise reduction chip, and the direct-current power output end of the power management module supplies power to the interphone control circuit. According to the interphone circuit for intelligent conversation noise reduction, a noise reduction function is added through the voice noise reduction chip so as to ensure conversation quality, the power supply management module arranged in the voice noise reduction chip is used for supplying power to the interphone control circuit, an independent power supply circuit is not needed any more, and the area of a circuit board is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of voice technology, relates to an intercom conversation technology, and specifically relates to an intercom circuit with intelligent conversation noise reduction. Background Art

[0002] Building intercom is an indispensable device in the community nowadays. It can control whether to let people outside in at home. At present, when using the commonly used building intercom, it is difficult to hear what the other party is saying due to other noises outside, such as car horns, children playing, car noise, and TV noise at home.

[0003] The disadvantages of the existing technology are poor call quality. When the surrounding environment is noisy, the other party's words cannot be heard clearly, which affects communication. At the same time, the noise reduction effect is limited. At the same time, traditional walkie-talkies require additional power management circuits and additional components, which makes the walkie-talkie circuit board larger in size. Utility Model Content

[0004] In order to overcome the technical defects of the prior art, the utility model discloses an intercom circuit with intelligent call noise reduction.

[0005] The intercom circuit with intelligent call noise reduction of the utility model comprises an intercom control circuit and a microphone, and also comprises a voice noise reduction chip connected between the microphone and the intercom control circuit. The voice noise reduction chip comprises an intelligent noise reduction processing circuit connected between the microphone and the intercom control circuit. The voice noise reduction chip is equipped with a power management module, and a DC power output end of the power management module supplies power to the intercom control circuit.

[0006] Preferably, the walkie-talkie control circuit is composed of a wireless communication module and a SIM card, an antenna and a power amplifier chip connected thereto, and the power amplifier chip is also connected to a speaker.

[0007] Preferably, the wireless communication module is N716-CB.

[0008] Preferably, the voice noise reduction chip also has a built-in AEC feedback circuit connected between the output end of the power amplifier chip and the intelligent noise reduction processing circuit.

[0009] Preferably, the speech noise reduction chip is CI1302.

[0010] Preferably, the power amplifier chip is FM8002A.

[0011] The intercom circuit with intelligent call noise reduction of the utility model adds a noise reduction function through a voice noise reduction chip to ensure call quality. At the same time, the intercom control circuit is powered by a power management module built into the voice noise reduction chip, and a separate power supply circuit is no longer needed, thereby reducing the circuit board area. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic diagram of a specific implementation of the intercom circuit for intelligent call noise reduction described in the present invention. DETAILED DESCRIPTION

[0013] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0014] The intercom circuit with intelligent call noise reduction of the utility model comprises an intercom control circuit and a microphone, and also comprises a voice noise reduction chip connected between the microphone and the intercom control circuit. The voice noise reduction chip comprises an intelligent noise reduction processing circuit connected between the microphone and the intercom control circuit. The voice noise reduction chip is equipped with a power management module, and a DC power output end of the power management module supplies power to the intercom control circuit.

[0015] Among them, the intelligent call noise reduction processing circuit outputs the noise-reduced audio to the outside; after the staff of the handheld walkie-talkie sends out the audio, it is collected by the microphone, and the sound is converted into an electrical signal through the microphone circuit and transmitted to the intelligent call noise reduction processing circuit; after the intelligent call noise reduction processing circuit receives the sound electrical signal, the intelligent call noise reduction processing circuit will perform in-depth analysis based on the recognized sound, and then identify which sounds are human voices and which sounds are surrounding noises, and filter out the noise, and then output a radio signal with only human voice audio information, which is transmitted to another walkie-talkie through a wireless transmission mechanism such as LTE, and the radio signal is received and amplified by the walkie-talkie control circuit of the other walkie-talkie, and then the speaker is driven to broadcast the human voice.

[0016] like Figure 1 As shown, a typical implementation of the walkie-talkie control circuit is composed of a wireless communication module and a SIM card connected thereto, an antenna and a power amplifier chip, and the power amplifier chip is also connected to a speaker. The wireless communication module receives and transmits wireless signals containing audio information through the antenna, and the power amplifier chip is used to amplify the digital signal transmitted from the wireless communication module and play it out from the speaker. The SIM card is used to provide and verify user identity information.

[0017] The function of the microphone circuit is to convert the analog electrical signal representing the acoustic signal received by the microphone into a digital signal that can be processed by subsequent devices, generally an analog-to-digital converter circuit.

[0018] The wireless communication module can be N716-CB. The N716-CB module is an LTE (Long Term Evolution) industrial-grade wireless communication module based on the Spreadtrum UIS8850 platform. It supports FDD-LTE and TDDLTE communications, audio, video, WiFi-SCAN and GNSS (Global Navigation Satellite System, abbreviation: GNSS, also known as global satellite navigation system) functions. It is suitable for the development of wireless meter reading terminals, handheld POS, industrial routers and other IoT communication equipment. It uses a 3.8V DC voltage, and the power amplifier chip used in conjunction with the wireless communication module can be FM8002A.

[0019] The voice noise reduction chip can adopt CI1302 developed by the applicant, which integrates the brain neural network processor BNPU V3 and CPU core, the system main frequency can reach 240MHz, built-in SRAM up to 640KByte, integrated PMU power management unit, integrated dual-channel high-performance low-power Audio Codec and multiple UART, IIC, IIS, PWM, GPIO and other peripheral control interfaces. The chip only needs a small number of peripheral devices such as resistors and capacitors to realize various products. CI1302 can achieve deep noise reduction through the built-in intelligent noise reduction processing circuit, and has AEC (Acoustic Echo Chancellor, echo cancellation) feedback circuit to achieve AEC echo cancellation, and has strong echo cancellation and environmental noise suppression capabilities without affecting the human voice. The CI1302 chip can eliminate different types of noise, such as music, wind noise, mechanical noise, steady-state noise, non-steady-state noise, impulse noise, babble noise, etc.

[0020] At the same time, CI1302 has three built-in high-performance LDOs, without the need for an external power chip, and only requires a small number of resistors and capacitors on the periphery. It can not only power the chip itself, but also output 3.4-5V DC voltage to the outside, which can meet the power requirements of the wireless communication module N716-CB, thus eliminating the need for an additional power management chip.

[0021] A typical application scenario of the utility model is short-distance communication between buildings, such as during a building intercom call, an outdoor person is talking on a handheld intercom, and at the same time a car is honking outside. At this time, the microphone on the outdoor intercom will transmit both the human voice and the car horn through the microphone circuit to the intelligent call noise reduction circuit built into the CI1302 chip; the intelligent call noise reduction circuit recognizes that there is a car horn noise in the internal audio, and at this time it will filter out the horn noise, output a digital signal containing only human voice audio, and transmit it to the indoor intercom through the antenna. After the wireless communication module of the indoor intercom receives it, it drives the speaker to play through the power amplifier circuit; at the same time, the AEC feedback circuit of the indoor intercom will analyze and process the electrical signal output by the power amplifier chip, and feed it back to the intelligent call noise reduction circuit to ensure the sound played by the indoor intercom speaker. When the indoor intercom holder is talking at the same time, the sound signal broadcast by the indoor intercom speaker will not be transmitted through the wireless communication module of the local machine, thereby eliminating the echo.

[0022] The intercom circuit with intelligent call noise reduction of the utility model adds a noise reduction function through a voice noise reduction chip to ensure call quality. At the same time, the intercom control circuit is powered by a power management module built into the voice noise reduction chip, and a separate power supply circuit is no longer needed, thereby reducing the circuit board area.

[0023] The foregoing describes various preferred embodiments of the utility model. If the preferred implementation modes in various preferred embodiments are not obviously self-contradictory or are based on a certain preferred implementation mode, various preferred implementation modes can be arbitrarily superimposed and used in combination. The embodiments and specific parameters in the embodiments are only for clearly describing the utility model verification process of the utility model owner, and are not used to limit the patent protection scope of the utility model. The patent protection scope of the utility model is still based on its claims. All equivalent structural changes made using the description and drawings of the utility model should be included in the protection scope of the utility model.

Claims

1. An intercom circuit with intelligent call noise reduction, comprising an intercom control circuit and a microphone, characterized in that: It also includes a voice noise reduction chip connected between the microphone and the intercom control circuit, the voice noise reduction chip includes an intelligent noise reduction processing circuit connected between the microphone and the intercom control circuit, the voice noise reduction chip has a built-in power management module, and the DC power output end of the power management module supplies power to the intercom control circuit.

2. The intercom circuit for intelligent call noise reduction according to claim 1, characterized in that: The walkie-talkie control circuit is composed of a wireless communication module and a SIM card, an antenna and a power amplifier chip connected thereto, and the power amplifier chip is also connected to a speaker.

3. The intercom circuit for intelligent call noise reduction as claimed in claim 2, characterized in that: The wireless communication module is N716-CB.

4. The intercom circuit for intelligent call noise reduction as claimed in claim 2, characterized in that: The voice noise reduction chip also has a built-in AEC feedback circuit connected between the output end of the power amplifier chip and the intelligent noise reduction processing circuit.

5. The intercom circuit with intelligent call noise reduction as claimed in claim 1, characterized in that: The voice noise reduction chip is C11302.

6. The intercom circuit for intelligent call noise reduction as claimed in claim 2, characterized in that: The power amplifier chip is FM8002A.

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