Abnormal Judgment Method of Fast Idle Mode of Hands-free Call Circuit

Abstract

The invention provides an abnormal judgment method for a fast idle mode of a hands-free calling circuit. The method comprises the flowing steps that S1, sine wave signals are input at the microphone end of the hands-free calling circuit, and the output end of a near-end / far-end level detector and the output end of a sending / receiving background noise detector are connected to the corresponding externally connected electrical levels respectively; S2, the hands-free calling circuit is switched into the fast idle mode from a sending mode by changing the externally connected electrical levels, and first switching time TF is measured; S3, the hands-free calling circuit is switched into a slow idle mode from the sending mode by changing the externally connected electrical levels, and second switching time TS is measured; S4, the first switching time and the second switching time are compared, the fact that the fast idle mode is normal is judged if TS >= 6TF, and otherwise, the fact that the fast idle mode is abnormal is judged. The test process of the method is controllable, testing efficiency can be improved greatly, and test errors caused by the difference of peripheral circuits in tests can be avoided effectively.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a method for judging abnormality of a fast idle mode of a hands-free call circuit. Background technique [0002] Private branch exchange (PBX), that is, group telephone, is widely used in enterprise office organizations, which greatly improves the work efficiency of enterprises. Among them, the high-quality hands-free call circuit is an important part of the PBX. The hands-free call circuit is usually provided by a general-purpose hands-free call chip, mainly including BL34018 (compatible with MC34018), BL34118 (compatible with MC34118) and so on. [0003] The hands-free call circuit adopts simplex call mode: when sending a call, the sending circuit is connected, the receiving circuit is disconnected, and the speaker does not make sound; when receiving a call, the speaker makes sound, and the sending circuit is disconnected. The transition between these two talking states doe...

AI Technical Summary

Problems solved by technology

[0009] The ensuing problem is that when judging the abnormality of the fast idle mode, because there may be differences in the peripheral circuits of the hands-free call circuit, it is difficult to determine the threshold of the sending and receiving signal levels in different application systems to judge the voice Whether the call circuit can enter the fast mode; at the same time, because the hands-free call circuit has a noise detection function, the voice signal must be used as the sending and receiving signal in the test

These factors make it difficult to determine the abnormality of the fast idle mode

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