With the cost of a mobile terminal (e.g., a mobile phone) continuously reducing and shipments continuously increasing, different mobile phones have certain differences in audio circuitry modules, and very few mobile phones even have serious quality problems, therefore, detection and calibration need to be conducted in production line. The following two kinds of problems mainly exist:
The first kind of problems is that hardware or a component itself has evident problems. For example, a receiver fails to sound and always has cooing noises; the volume of a microphone (hereinafter referred as to MIC) is so low that the user can not hear it clearly. Distributing such phones to users will result in users' complaints. Therefore, in the production line, the mobile phones with such problems should be directly rejected or their components should be directly replaced.
The second kind of problems is due to the fluctuation of components themselves, resulting in that the setting of some parameters in some phones are not appropriate, therefore their audio frequency parameters need to be updated. For example, due to a component, the sensitivity of MIC has a difference of ±3 dB, and the total difference will be 6 dB. If the uplink analog gain is not changed, the uplink volume will be too high or too low depending on individual difference, and if it is too high, environmental impacts force a user to speak with a loud voice, and the uplink cracked voice will be evident, thus reducing the user's experience.
To solve such problems, the audio frequency testing item needs to be added in the production test so as to reject mobile phones with the first kind of problems and conduct automatic parameter modification to mobile phones with the second kind of problems.