CN111770402A

CN111770402A - Digital microphone capable of preventing squeaking

Info

Publication number: CN111770402A
Application number: CN202010788261.XA
Authority: CN
Inventors: 宋攀; 吴东亮; 孙运
Original assignee: Fiontu Intelligent Shenzhen Technology Group Co ltd
Current assignee: Fiontu Intelligent Shenzhen Technology Group Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2020-10-13

Abstract

A howling prevention digital microphone, comprising: the system comprises a pickup module, an audio input amplification module, an audio AD/DA module, an MCU audio processing module, an audio network transmission module, a network power supply module, a power supply module and a network port, wherein the pickup module, the audio input amplification module, the audio AD/DA module, the MCU audio processing module, the audio network transmission module and the network port are electrically connected in sequence; the power supply module is respectively electrically connected with the audio input amplification module, the audio AD/DA module, the MCU audio processing module, the audio network transmission module and the network power supply module and is used for supplying the electric power transmitted by the network power supply module to the audio input amplification module, the audio AD/DA module, the MCU audio processing module and the audio network transmission module; the audio network transmission module and the network port are also electrically connected with the network power supply module. Compared with the existing scheme of adding a processor in front of a microphone, the voice-whistling prevention method has the advantages of thorough whistling prevention capability, better tone quality, better anti-interference type compared with an analog microphone and no limitation of transmission distance.

Description

Digital microphone capable of preventing squeaking

Technical Field

The invention relates to a microphone used in a conference, in particular to a howling-preventing digital microphone.

Background

With the higher requirements of modern conferences, the higher requirements are continuously put forward on the sound pickup distance and the sound quality of the microphone, so that the traditional analog microphone has great limitations. The traditional analog microphone is powered by a processor or a phantom of an audio console, the maximum power supply is only 48V20mA, if timbre processing (audio anti-howling processing) is required to be performed on the traditional microphone, the power supply cannot meet the requirement, and the traditional microphone has higher requirements on an analog transmission line and influences the transmission of the timbre along with the increase of the transmission distance.

In the audio amplification process, the traditional microphone can generate howling due to feedback self-excitation, and the high-sensitivity microphone acquisition equipment can more easily acquire the audio signal played by the loudspeaker box to generate howling. At present, in a common processing mode, howling suppression is performed through a processor, so that howling is not ideal due to delay of an analog audio transmission line to an audio signal, and the sound quality is influenced when the howling is processed.

Disclosure of Invention

In order to effectively solve the above problems, an object of the present invention is to solve the problem of audio digital transmission and to achieve audio howling prevention at a microphone side, thereby providing a howling prevention digital microphone.

The technical scheme of the invention is as follows:

a howling prevention digital microphone, comprising: the system comprises a pickup module, an audio input amplification module, an audio AD/DA module, an MCU audio processing module, an audio network transmission module, a network power supply module, a power supply module and a network port, wherein the pickup module, the audio input amplification module, the audio AD/DA module, the MCU audio processing module, the audio network transmission module and the network port are electrically connected in sequence;

the power supply module is respectively and electrically connected with the audio input amplification module, the audio AD/DA module, the MCU audio processing module, the audio network transmission module and the network power supply module and is used for supplying the power transmitted by the network power supply module to the audio input amplification module, the audio AD/DA module, the MCU audio processing module and the audio network transmission module;

the audio network transmission module and the network port are also electrically connected with the network power supply module.

Optionally, the pickup module includes a microphone or a pickup module, and the pickup module is configured to pick up sound and output an analog signal.

Optionally, the audio input amplifying module includes a first operational amplifier, and the audio input amplifying module amplifies the analog signal transmitted from the sound pickup module and transmits the amplified signal to the audio AD/DA module.

Optionally, the audio AD/DA module includes: the digital-to-analog conversion device comprises an analog-to-digital conversion unit and a digital-to-analog conversion unit, wherein the analog-to-digital conversion unit converts an amplified analog signal into a K/bit audio digital signal and transmits the K/bit audio digital signal to the MCU audio processing module, and the digital-to-analog conversion unit converts the K/bit audio digital signal transmitted by the network into an analog signal.

Optionally, the audio network transmission module transmits the processed audio digital signal to the network through the internet access, and simultaneously downloads the audio digital signal transmitted over the network through the internet access and transmits the audio digital signal to the audio AD/DA module through the MCU audio processing module.

Optionally, the network power supply module includes: and the network power supply module is used for transmitting the electric energy transmitted in the network port to the power module to supply power to each module.

Optionally, the howling prevention digital microphone further comprises: the audio output amplification module is respectively electrically connected with the audio AD/DA module and the earphone interface.

Optionally, the audio output amplifying module includes a second operational amplifier, and is configured to match an analog signal sent by the digital-to-analog conversion unit into an analog signal suitable for the earphone terminal, and output the analog signal through the earphone port.

Optionally, the howling prevention digital microphone further comprises: the key module is respectively and electrically connected with the MCU audio processing module and the indicator light module.

The invention has the advantages that the invention processes the audio signal at the audio front end, has thorough anti-howling capability and better tone quality compared with the prior proposal of adding a processor in front of a microphone, has better anti-interference type compared with an analog microphone, and is not limited by transmission distance.

Drawings

FIG. 1 is a block diagram of the system architecture of the present invention;

FIG. 2 is a schematic diagram of communication among the audio AD/DA module, the MCU audio processing module, the audio network transmission module, and the network port according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a howling prevention digital microphone includes: the system comprises a pickup module 1, an audio input amplification module 2, an audio AD/DA module 3, an MCU audio processing module 4, an audio network transmission module 5, a network power supply module 6, a power supply module 7 and a network port 8, wherein the pickup module 1, the audio input amplification module 2, the audio AD/DA module 3, the MCU audio processing module 4, the audio network transmission module 5 and the network port 8 are electrically connected in sequence;

the power supply module 7 is respectively electrically connected with the audio input amplification module 2, the audio AD/DA module 3, the MCU audio processing module 4, the audio network transmission module 5 and the network power supply module 6, and is used for supplying the power transmitted by the network power supply module 6 to the audio input amplification module 2, the audio AD/DA module 3, the MCU audio processing module 4 and the audio network transmission module 5;

the audio network transmission module 5 and the network port 8 are also electrically connected with the network power supply module 6.

Pickup module 1 includes miaow head or pickup module, pickup module 1 is used for carrying out the pickup and exports analog signal.

The audio input amplification module 2 comprises a first operational amplifier, the audio input amplification module 2 amplifies the analog signals transmitted by the pickup module 1, and transmits the amplified signals to the audio AD/DA module 3, so that sufficient signal intensity guarantee is provided for a rear-end audio analog-to-digital (AD module) module.

The audio AD/DA module 3 includes: the analog-to-digital conversion unit is used for converting the amplified analog signals into 48K/24bit audio digital signals and transmitting the audio digital signals to the MCU audio processing module 4, and the digital-to-analog conversion unit is used for converting the 48K/24bit audio digital signals transmitted by the network into analog signals and providing earphone analog signals for playing.

The MCU audio processing module 4 is used for performing anti-howling processing on the audio digital signal transmitted by the audio AD/DA module 3.

The audio network transmission module 5 is configured to transmit the audio digital signal after the howling prevention processing to the network through the network port 8, and simultaneously download the audio digital signal transmitted on the network through the network port 8 and transmit the audio digital signal to the audio AD/DA module 3 through the MCU audio processing module 4.

The network power supply module 6 includes: the network power supply module transmits electric energy transmitted in the internet access 8 to the power module 7 to supply power to each module, a 10W power module is used in the embodiment, the power consumption of the whole power supply module is about 5W, the power supply requirement is completely met, and the network power supply module 6 obtains electric quantity supply from the internet access 8.

The howling prevention digital microphone further comprises: the audio frequency output amplification module 9 and the earphone interface 10, the audio frequency output amplification module 9 is respectively connected with the audio frequency AD/DA module 3 and the earphone interface 10.

The audio output amplifying module 9 includes a second operational amplifier, and is configured to match an analog signal sent by the digital-to-analog conversion unit into an analog signal suitable for the earphone end, and output the analog signal through the earphone port.

The howling prevention digital microphone further comprises: the audio processing device comprises a key module 11 and an indicator light module 12, wherein the key module 11 is electrically connected with the MCU audio processing module 4 and the indicator light module 12 respectively, and the key module 11 is used for a user to operate.

As shown in fig. 2, the audio AD/DA module 3, the MCU audio processing module 4, the audio network transmission module 5 and the network port 8 communicate with each other by using PTP protocol and transmit a clock signal (CLK). The audio AD/DA module 3, the MCU audio processing module 4, the audio network transmission module 5 and the network port 8 achieve the effect of synchronous transmission, and the real-time requirement of an audio system is met.

Claims

1. A howling prevention digital microphone, comprising: the system comprises a pickup module (1), an audio input amplification module (2), an audio AD/DA module (3), an MCU audio processing module (4), an audio network transmission module (5), a network power supply module (6), a power supply module (7) and a network port (8), wherein the pickup module (1), the audio input amplification module (2), the audio AD/DA module (3), the MCU audio processing module (4), the audio network transmission module (5) and the network port (8) are sequentially and electrically connected;

the power supply module (7) is respectively electrically connected with the audio input amplification module (2), the audio AD/DA module (3), the MCU audio processing module (4), the audio network transmission module (5) and the network power supply module (6) and is used for supplying the electric power transmitted by the network power supply module (6) to the audio input amplification module (2), the audio AD/DA module (3), the MCU audio processing module (4) and the audio network transmission module (5);

the audio network transmission module (5) and the network port (8) are also electrically connected with the network power supply module (6).

2. The howling prevention digital microphone according to claim 1, wherein the sound pickup module (1) comprises a microphone or a sound pickup module, and the sound pickup module (1) is configured to pick up sound and output an analog signal.

3. The howling prevention digital microphone according to claim 1, wherein the audio input amplification module (2) comprises a first operational amplifier, and the audio input amplification module (2) amplifies the analog signal transmitted from the pickup module (1) and transmits the amplified signal to the audio AD/DA module (3).

4. Howling prevention digital microphone according to claim 1, characterized in that the audio AD/DA module (3) comprises: the device comprises an analog-to-digital conversion unit and a digital-to-analog conversion unit, wherein the analog-to-digital conversion unit converts an amplified analog signal into a (48) K/(24) bit audio digital signal and transmits the audio digital signal to an MCU audio processing module (4), and the digital-to-analog conversion unit converts the audio digital signal (48) K/(24) bit transmitted from a network into an analog signal.

5. The howling prevention digital microphone according to claim 1, wherein the audio network transmission module (5) transmits the processed audio digital signal to the network through the network port (8), and simultaneously downloads the audio digital signal transmitted on the network through the network port (8) and transmits the audio digital signal to the audio AD/DA module (3) through the MCU audio processing module (4).

6. Howling prevention digital microphone according to claim 1, characterized in that the network power supply module (6) comprises: and the network power supply module (6) is used for transmitting the electric energy transmitted in the network port (8) to the power module (7) to supply power to the modules.

7. The howling-resistant digital microphone according to claim 1, further comprising: audio output amplifier module (9) and earphone interface (10), audio output amplifier module (9) respectively with audio AD/DA module (3), earphone interface (10) electricity are connected.

8. The howling prevention digital microphone according to claim 7, wherein the audio output amplifying module (9) comprises a second operational amplifier for matching the analog signal sent by the digital-to-analog converting unit into an analog signal suitable for the earphone end and outputting the analog signal through the earphone port.

9. The howling-resistant digital microphone according to claim 1, further comprising: the audio signal processing device comprises a key module (11) and an indicator light module (12), wherein the key module (11) is electrically connected with the MCU audio processing module (4) and the indicator light module (12) respectively.