Mobile telephone and correction method of internal electroacoustic component thereof

Abstract

The invention discloses a mobile telephone and a correction method of an internal electroacoustic component of the mobile telephone. The mobile telephone comprises a native machine, a handfree earphone and a detection module. The correction method comprises the following steps that: the detection module turns on a voice frequency generator of the mobile telephone to generate a first voice frequency electric signal; the first voice frequency electric signal is converted into a first acoustical signal for displaying through an electrical-acoustical conversion component; the electrical-acoustical conversion component is placed near an acoustical-electrical conversion component, wherein the acoustical-electrical conversion component receives the first acoustical signal which is converted into a second voice frequency electric signal to be transmitted back to the detection module; and the detection module compares the difference of the first and second voice frequency electric signals, and judges whether the parameters of the internal electroacoustic component are within a preset range or not according to the comparison result, if so, 'normal' is displayed, if not, 'abnormal' is displayed, and the parameters of the internal electroacoustic component are adjusted. According to the invention, the internal electroacoustic component of the mobile telephone can be corrected at different sites to ensure stable sounding volume just by providing the portable standard handfree earphone without extra acoustic testing instrument.

Description

technical field [0001] The invention relates to a calibration method of an electroacoustic element, in particular to a calibration method of a built-in electroacoustic element of a mobile phone. Background technique [0002] The volume and frequency response of the handset, speaker, built-in microphone, earphone, and external microphone (the volume difference at each frequency) need to be set properly after experiments by engineers during design, so as to have an appropriate volume of sound when talking with other people , as far as mobile phones are concerned, the volume and frequency response of the handset, speaker, built-in microphone, earphone, and external microphone must be certified by the certification laboratory before they can be marketed. [0003] However, due to the variation of production procedures, some of the same components, even in the same production batch number, are louder and some are louder for the acoustic-electric conversion components such as earpi...

AI Technical Summary

Problems solved by technology

For mobile phones in the past, the volume variation of the earpiece and the built-in microphone at most caused the mobile phone to receive / speak louder or softer, but today's mobile phones often have built-in complex echo cancellation (Echo cancellation) and background noise cancellation (noise cancellation) Computing function, at this time, the variation of the acoustic conversion components will have a great impact on the performance of these calculations. For example, if the volume of the earpiece or speaker of a mobile phone is 3dB higher than the standard value, the sensitivity of the built-in microphone is also 3dB higher than the standard value. The resulting echo is 3+3=6dB more than the design value. At this time, in the other extreme situation of the mobile phone, if the volume of two components is 3dB lower than the standard value, the echo is 6dB lower than the design value.

Comparing A and B, the difference in echo is as high as 12dB. A standard parameter cannot make both A and B mobile phones have good sound performance

[0004] At present, one of the solutions to the above-mentioned problems is to set up sound measuring instruments on the production line to measure the volume of the earpiece, the volume of the speakers, and the sensitivity of the built-in microphone of each mobile phone, and fill in the corrected settings. It is a production method used by some manufacturers, but because acoustic measuring instruments are expensive, a mobile phone may be produced in different locations around the world, or even in factories of different customers. It is impossible to require all factories to purchase instruments, so most factories are not right for individual Parameter correction for variations in acoustic components of mobile phones

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