CN216162863U

CN216162863U - Audio squeaking suppression device

Info

Publication number: CN216162863U
Application number: CN202122169584.3U
Authority: CN
Inventors: 张华�
Original assignee: Shenzhen Guangpin Audio Co ltd
Current assignee: Shenzhen Guangpin Audio Co ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-04-01
Anticipated expiration: 2031-09-08

Abstract

The utility model discloses an audio squeal suppression device in the acoustic field, which comprises an input module, a squeal suppression module and an output module, and is characterized in that: the input module inputs an analog audio signal; the howling suppression module comprises a coaxial digital signal converter for converting an input analog audio signal into a coaxial digital signal and/or an optical fiber digital signal converter for converting an input analog audio signal into an optical fiber digital signal, and the output module is connected with a power amplifier and amplified to a loudspeaker, so that a positive feedback circulation loop is cut off between an audio signal transmitted by a microphone and an audio signal output by the loudspeaker after passing through an audio howling suppression device, and thus, no positive feedback exists between the microphone and the loudspeaker, and the loudspeaker does not have howling.

Description

Audio squeaking suppression device

Technical Field

The utility model belongs to the field of acoustics, and particularly relates to an audio howling suppression device.

Background

Along with the development of science and technology, in the sound system is constantly upgraded and is reformed transform, because sound systems such as KTV of prior art, as shown in fig. 1: after the audio signal output by the microphone is amplified by the amplifier, part of the amplified audio signal returns to the microphone again, so that a loop is formed to vibrate and whistle.

Howling occurs in multiple frequency bands of audio, the frequency of each occurrence is different, so that the prior patent CN201610883702.8 is connected behind a microphone, the frequency and the phase of an audio signal of the microphone are corrected and adjusted by a software program, and it is determined that howling occurs in an audio to be detected, so that a positive feedback cannot be formed between signals fed back to the microphone by a speaker, thereby suppressing the howling of the speaker.

SUMMERY OF THE UTILITY MODEL

To solve the problems set forth in the background art described above. The utility model provides an audio howling suppression device with low cost and simple structure.

In order to achieve the purpose, the utility model provides the following technical scheme: an audio squeal suppression device comprises an input module, a squeal suppression module and an output module, and is characterized in that: the input module inputs an analog audio signal; the howling suppression module comprises a coaxial digital signal converter for converting an input analog audio signal into a coaxial digital signal and/or an optical fiber digital signal converter for converting an input analog audio signal into an optical fiber digital signal; the output module correspondingly comprises a coaxial digital signal output end and an optical fiber digital signal output end.

Wherein, the preferred scheme is as follows: the howling suppression module also comprises an analog signal converter which converts the input audio analog signal into a digital and/or optical fiber digital signal and then converts the digital and/or optical fiber digital signal back to an analog signal for output, and the corresponding output module comprises an analog signal output end.

Wherein, the preferred scheme is as follows: the output module comprises a coaxial digital signal output end, and/or an optical fiber digital signal output end, and/or an analog audio output port.

Wherein, the preferred scheme is as follows: and the coaxial digital signal output end or the optical fiber digital signal output end or the analog audio output end of the output module is connected with a conventional power amplifier, and the signal is amplified and then output through a loudspeaker.

Wherein, the preferred scheme is as follows: the input module comprises a power supply module, an earphone interface and an RCA (Rolling circle amplification) lotus head interface, wherein the power supply module provides working voltage of the howling suppression module.

Wherein, the preferred scheme is as follows: the coaxial digital signal converter and the optical fiber digital signal converter comprise a first signal converter U7 and a second signal converter U9, audio analog signals INL and INR are respectively input with

terminals

13 and 14 of a first signal converter U7 through

terminals

8 and 9 of a second signal converter U9 and then pass through a first signal converter U7, a 26 terminal of a first signal converter U7 outputs coaxial digital signals through a resistor R30 and a capacitor 37 after a direct current circuit is isolated, a J11 terminal is connected, and a 25 terminal of a first signal converter U7 outputs optical fiber digital signals through a current limiting resistor R6 and an optical fiber transmitter J50.

Wherein, the preferred scheme is as follows: the analog signal converter comprises a terminal 16 and a terminal 21 of a processor U8, and a terminal 20, wherein an input coaxial digital signal and an input optical fiber digital signal are processed by the processor U8, and then an analog signal is output through a terminal 13 of the processor U8.

Compared with the prior art, the utility model has the beneficial effects that: the input of the device is analog audio signals, the received audio analog signals are converted into output optical fiber/coaxial digital signals and/or analog audio signals through a howling suppression module, the analog audio signals transmitted by a microphone are ended, and the signals converted by the howling suppression module are provided to a power amplifier to be amplified to a loudspeaker. No loop is formed between the audio signal transmitted by the microphone and the audio signal output by the loudspeaker, so that no positive feedback is generated to cause loudspeaker howling.

Drawings

FIG. 1 is a schematic diagram of a prior art audio squeal formation architecture;

fig. 2 is a schematic structural diagram of a first embodiment of an audio howling suppression device according to the present invention;

fig. 3 is a schematic structural diagram of an audio howling suppression device according to a second embodiment of the present invention;

fig. 4 is a schematic structural diagram of an audio howling suppression device according to a third embodiment of the present invention;

FIG. 5 is a schematic diagram of the circuit structure of the coaxial, fiber-optic digital signal converters 121, 122 of the present invention;

FIG. 6 is a schematic diagram of the circuit structure of the analog signal converter 123 according to the present invention;

fig. 7 is a schematic diagram of the structure of the audio howling suppressing apparatus 10 according to the present invention applied to a sound system.

Reference numerals:

10 … … audio squeal suppression device

11 … … input module

12 … … Howling suppression module

121 … … coaxial digital signal converter

122 … … optical fiber digital signal converter

123 … … analog signal converter

13 … … output module

131 … … coaxial digital signal output terminal

132 … … optical fiber digital signal output terminal

133 … … analog signal output terminal

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.

Fig. 2 is a schematic structural diagram of a first embodiment of an audio howling suppression apparatus according to the present invention, and as shown in fig. 2, the present invention provides the following technical solutions: an audio howling suppression device 10 comprises an input module 11, a howling suppression module 12 and an output module 13, wherein an analog audio signal is input into the input module 11; the howling suppression module 12 includes a coaxial digital signal converter 121 for converting an input analog audio signal into a coaxial digital signal; and the optical fiber digital signal converter 122 converts the input analog audio signal into an optical fiber digital signal; the output module 13 includes a coaxial digital signal output end 131 and a fiber digital signal output end 132. In this way, the analog audio signal passing through the howling suppression module 12 is directly output in the form of a digital signal through the output module 13, and a loop in the prior art is broken, so that the howling suppression effect is achieved.

Fig. 3 is a schematic structural diagram of a second embodiment of an audio howling suppression device according to the present invention, as shown in fig. 3: in order to adapt to the input of various power amplifiers, the howling suppression module 12 of this embodiment further includes an analog signal converter 123, where the analog signal converter 123 converts the digital signal output by the coaxial digital signal converter 121 and/or the optical fiber digital signal converter 122 back to an analog signal; the corresponding output module 13 further includes an analog signal output terminal 133.

Fig. 4 is a schematic structural diagram of a third embodiment of the audio howling suppression apparatus according to the present invention, when digital signals and optical fiber coaxial signals are not required to be output, the output module 13 only includes an output end of an analog signal output end 132, and in this embodiment, the howling suppression module 12 further includes an analog signal converter 123 to convert input audio analog signals into digital and/or optical fiber digital signals and then convert the digital and/or optical fiber digital signals back to analog signals for output, so as to break a loop and achieve the howling suppression effect.

Fig. 5 is a schematic circuit diagram of the coaxial and optical fiber digital signal converter 121, as shown in fig. 5:

the audio analog signals INL and INR are respectively input to the

terminals

13 and 14 of the first signal converter U7 through the

terminals

8 and 9 of the second signal converter U9, and then pass through the first signal converter U7, the terminal 26 of the first signal converter U7 outputs a coaxial digital signal through the terminal J11 after passing through the resistor R30 and the capacitor 37 for dc isolation, and the terminal 25 of the first signal converter U7 outputs an optical fiber digital signal through the optical fiber transmitter J50 through the current limiting resistor R6.

Fig. 6 is a schematic diagram of a circuit structure of the analog signal converter 123, as shown in fig. 6: the coaxial digital signal and the optical fiber digital signal are input through a terminal 16 and a terminal 21 of the processor U8 and a terminal 20, respectively, and are processed by the processor U8, and then analog signals are output through a terminal 13 of the processor U8.

Fig. 7 is a schematic diagram of the structure of the audio howling suppressing apparatus 10 applied to a sound system; as shown in fig. 7: after the howling suppression module 10 converts the received audio analog signal into an output optical fiber/coaxial digital signal and/or an analog audio signal, the signal converted by the howling suppression module is amplified to a loudspeaker through an output module 13 to a power amplifier. No loop is formed between the audio signal transmitted by the microphone and the audio signal output by the loudspeaker, so that no positive feedback is generated to cause loudspeaker howling.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An audio howling suppression device comprises an input module (11), a howling suppression module (12) and an output module (13), and is characterized in that: the input module (11) inputs an analog audio signal; the howling suppression module (12) comprises a coaxial digital signal converter (121) for converting an input analog audio signal into a coaxial digital signal and/or a fiber digital signal converter (122) for converting an input analog audio signal into a fiber digital signal; the output module (13) correspondingly comprises a coaxial digital signal output end (131) and an optical fiber digital signal output end (132).

2. The audio howling suppression device according to claim 1, characterized in that: the howling suppression module (12) further comprises an analog signal converter (123) which converts an input audio analog signal into a coaxial digital signal and an optical fiber digital signal and then converts the coaxial digital signal and the optical fiber digital signal back to an analog signal for output, and the corresponding output module (13) comprises an analog signal output end (133).

3. An audio howling suppression apparatus according to claim 1 or 2, characterized in that: and a coaxial digital signal output end (131) or an optical fiber digital signal output end (132) or an analog signal output end (133) of the output module (13) is connected with a conventional power amplifier, and the signal is amplified and then output through a loudspeaker.

4. The audio howling suppression device according to claim 1, characterized in that: the input module comprises a power supply module (111) which provides working voltage of the howling suppression module, an earphone interface and an RCA (Rolling circle amplification) lotus head interface.

5. The audio howling suppression device according to claim 1, characterized in that: the coaxial digital signal converter (121) and the optical fiber digital signal converter (122) comprise a first signal converter U7 and a second signal converter U9, audio analog signals INL and INR are respectively input with terminals 13 and 14 of a first signal converter U7 through terminals 8 and 9 of a second signal converter U9 and then pass through a first signal converter U7, a coaxial digital signal is output through a resistor R30 and a capacitor 37 through a DC isolating circuit at a terminal 26 of a first signal converter U7 and a J11, and an optical fiber digital signal is output through an optical fiber transmitter J50 through a current limiting resistor R6 at a terminal 25 of a first signal converter U7.

6. The audio howling suppression device according to claim 2, characterized in that: the analog signal converter (123) comprises a terminal 16 and a terminal 21 of a processor U8, and a terminal 20, wherein an input coaxial digital signal and an input optical fiber digital signal are processed by the processor U8, and then an analog signal is output through a terminal 13 of the processor U8.