Analogue feedback design method for active noise-canceling headphone

A technology of noise reduction earphones and design methods, which is applied in earpiece/earphone accessories, computing, special data processing applications, etc., can solve the problems that the analog circuit unit cannot realize the second-order stable system transfer function, and the physics cannot be realized, so as to achieve the physical Good realizability, low sensitivity characteristics, guaranteed effect of noise reduction performance

Active Publication Date: 2014-03-12
NANJING UNIV
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Problems solved by technology

Furthermore, a given analog circuit unit cannot realize a second-order stable system transfer function with arbitrary pole-zero positions
If the zero-pole position of the transfer function of the second-order stable system is improper, the actual circuit parameters of the specified unit circuit will be negative, which is physically impossible

Method used

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  • Analogue feedback design method for active noise-canceling headphone
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  • Analogue feedback design method for active noise-canceling headphone

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Embodiment Construction

[0031] The feature of the analog feedback active noise reduction earphone design method proposed by the present invention is: based on H ∞ The frequency characteristics of the controller are optimized by technology synthesis; the optimized frequency characteristics of the controller are realized by the digital filter first, and then the frequency characteristics of the digital filter are fitted to the low-order continuous domain transfer function; the obtained low-order is realized by the generalized second-order GIC circuit Continuous domain transfer function. The design method will be described in detail below by taking the realization of an analog feedback active earphone with a maximum noise reduction of 18dB in the frequency band below 1000 Hz as an example.

[0032] (1) Wear the earphone on the artificial head, and test the frequency characteristics of the secondary path as attached image 3As shown, the nominal path is the secondary path when the earphone is worn in th...

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Abstract

The invention discloses an analogue feedback design method for an active noise-canceling headphone. The method is characterized in that optimized controller frequency characteristics are integrated on the basis of an H infinite technology; the optimized controller frequency characteristics are achieved by a digital filter, and frequency characteristics of the digital filter are fitted into a lower-order continuous domain transfer function; a generalized second-order GIC (general impedance converter) circuit is used for implementing the lower-order continuous domain transfer function. The method has the remarkable advantages that (1) the optimized controller frequency characteristics are integrated on the basis of the H infinite technology, so that the optimization of noise-canceling performance and system robustness are ensured; (2) the optimized controller frequency characteristics are achieved by the digital filter, and frequency characteristics of the digital filter are fitted into the lower-order continuous domain transfer function, so that minimum phase characteristics of a controller are ensured; (3) the generalized second-order GIC (general impedance converter) circuit can be used for implementing the lower-order continuous domain transfer function at any pole-zero position, and the method has the characteristic of low sensitivity and high physical implementability.

Description

1. Technical field [0001] The invention relates to a control design method of a feedback active noise control system, and mainly provides an analog feedback design method for an active noise reduction earphone. 2. Background technology [0002] Active earphones are used as a hearing protection device, and its structure is as follows: figure 1 As shown, it consists of a microphone, a circuit (including a preamplifier circuit, a control circuit and a power amplifier circuit), and a secondary source (speaker). Its noise reduction design is mostly realized based on feedback technology. Usually, given the design goal, a certain optimization design method is applied to obtain the optimized frequency characteristics of the controller, and digital feedback or analog feedback is used to realize it. [0003] Digital feedback has the advantages of high flexibility and easy implementation. Rafaely et al. Applied H 2 performance criteria and H ∞ A digital feedback controller was desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H04R1/10
Inventor 张丽敏邹海山卢晶邱小军
Owner NANJING UNIV
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