Test method for noise reduction earphone filter calculation

Abstract

The invention discloses a test method for noise reduction earphone filter calculation. The test method comprises the following steps: a noise calibration step; a passive testing step: driving a soundbox to send out a frequency sweeping noise signal through a frequency sweeping signal, collecting a sound signal sent out by the sound box, converting the sound signal into an electric signal, and calculating a frequency response curve of the sound box; meanwhile, collecting the sweep frequency signal, calculating a noise phase curve by combining the collected sound signal emitted by the sound box, and calculating a passive frequency response and a passive phase; a horn parameter testing step: collecting sound signals emitted by the horn and converting the sound signals into electric signals,calculating a cavity horn frequency response curve, and calculating a phase curve of the cavity horn at the same time; a microphone parameter test step; and a calculation step: calculating ideal frequency response data and phase data of the target filter. According to the test method for noise reduction earphone filter calculation, data conversion is automatically carried out, a testing process issimplified, a product development period is shortened, and the product development efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of noise reduction of noise reduction earphones, in particular to a test method for calculating noise reduction earphone filters that automatically performs data conversion, simplifies the test process, shortens the product development cycle, and improves product development efficiency. Background technique [0002] Analog noise reduction is mainly implemented by hardware. The hardware design mainly focuses on the design of the filter. It has high requirements for the measurement of the correlation coefficient and the preparation of calculation. The hardware circuit is very sensitive to the change of the component parameters. Once the hardware filter is determined, it is necessary It is very difficult to re-modify and debug. Therefore, the requirements for the entire R&D process are extremely high. Any problem in any link will lead to the failure of the entire product design. [0003] There are following def...

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Problems solved by technology

[0004] 1 At present, the parameter measurement required by the analog noise reduction design filter mainly adopts the single-step measurement method, and the test process is tedious and time-consuming;

[0005] 2 After the required parameters are measured, the engineer needs to convert the relevant parameters, which takes a long time and has a high risk of calculation errors;

[0006] 3. After calculating the corresponding filter parameters, the current test target filter basically adopts the method of manually replacing the hardware circuit. This method has high development costs and requires high knowledge structure of engineers;

[0007] 4 Acoustic engineers will repeat the 1 and 2 actions in the process of designing the filter, and then perform the 3 actions after finding a suitable earphone cavity. Due to the cumbersome process of 1 and 2, the product development cycle is long, the development efficiency is low, and the risk of error is high

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