One-piece signal channel feedback ANC system

An active noise control, single-channel technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problem of not involving the integrated design of the control system, etc., to achieve flexible and adjustable system parameters and performance, good control effect, and stable control effect. Effect

Inactive Publication Date: 2012-01-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although there have been many researches and applications on feedback active noise control systems, they have not involved the integrated design of the control system, that is, the integrated design of the speaker unit, speaker cabinet, and control circuit.

Method used

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  • One-piece signal channel feedback ANC system
  • One-piece signal channel feedback ANC system
  • One-piece signal channel feedback ANC system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] The present invention is described in detail below by examples.

[0021] Such as figure 1 As shown, the integrated single-channel feedback active noise control system consists of a speaker unit 2, a speaker cabinet 3, an error microphone 1, and a circuit part 4 (including a microphone preamplifier circuit, a variable gain control circuit, and a second-order RC feedback control circuit. , power amplifier circuit) and DC power supply 5 components. All components of the system are integrated in the loudspeaker cabinet without separate components. Wherein, the error microphone 1 is installed on the hexagonal platform 6 at the top of the speaker box.

[0022] In this example, the speaker box 3 is a regular hexagonal prism closed speaker designed for special low frequency response requirements, with a height of 20.36cm and a side length of 9.50cm; The effect of the microphone 1 is that the length of the lower side of the prism is equal to that of the prism box, the length ...

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PUM

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Abstract

The invention discloses a signal channel feedback ANC system that is designed in a one-piece mode. The system mainly comprises: a microphone; a circuit system, which includes a microphone pre-amplification circuit, a variable gain control circuit, a second order RC control circuit and a power amplification circuit; a loudspeaker unit; a loudspeaker casing; and a power supply. According to the invention, an integrated design problem of a feedback ANC system is solved, wherein the designs include a control circuit design, filter parameter estimation and a loudspeaker casing design. Moreover, the system has advantages of good and stable control effects, a beautiful control system appearance as well as flexible and adjustable system parameters and performances.

Description

1. Technical field [0001] The invention relates to an integrated single-channel feedback active noise control system. 2. Background technology [0002] Active Noise Control (ANC) is a noise control method that introduces a secondary sound source and interacts with the primary noise source and its sound field to achieve the purpose of noise suppression. In 1953, Olson and May expounded the principle and application of "electronic sound absorber" in detail. Through their many foreseeable examples, it can be seen that active noise control technology is ready to move from theory to application. In the next two decades, electronic circuits and signal processing technology have developed greatly, and large-scale integrated circuits and digital circuits have entered various actual control systems at an extremely fast speed. At the same time, a group of researchers represented by Jessel, Mangiante and Canevet, using the Huygens principle, demonstrated that there is a sound field ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
Inventor 浦宏杰邹海山邱小军
Owner NANJING UNIV
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