Active noise reduction test earphone

Abstract

The invention provides an active noise reduction test earphone, at least comprising an audio speaker group, a noise reduction speaker group, a switch circuit, a noise reduction circuit, a USB module,and a USB audio encoding and decoding module, wherein the audio speaker group is connected to the USB decoding and encoding module through the USB module for playing audio files; the USB module is respectively connected to the USB decoding and encoding module and the switch circuit; the input end of the switch circuit is connected with the battery, and the output end is connected with the noise reduction circuit and the USB module circuit; the noise reduction speaker group is connected to the noise reduction circuit for generating reverse sound waves of ambient noise. The invention improves the quality of the sound playing and recording of the listening and speaking test through active noise reduction, voice detection and blind source separation, and improves the justness and fairness of the language listening and speaking test.

Description

technical field [0001] The invention belongs to the field of examination equipment, and relates to an examination earphone, in particular to an active noise reduction examination earphone. Background technique [0002] Nowadays, listening and speaking tests are becoming more and more important as a means of testing phonetic ability. For example, the proportion of English listening and speaking tests in the college entrance examination is gradually increasing. During the implementation of the English listening and speaking test, there are usually 30-50 candidates taking the test at the same time in each test room, and the distance between candidates is usually within 2 meters. A test taker's recording of an answer to a speaking question can have an effect on surrounding test takers who are concentrating on the listening content. In addition, due to the candidates' psychological factors and irregular operation, too much noise was recorded during the recording, which directly ...

AI Technical Summary

Problems solved by technology

However, during the English test, in order to ensure the uninterrupted nature of the test headset, it is required to take power from the USB, and the USB power supply will introduce external power supply ripples and cause fluctuations

Images