Sound amplifying system with classroom speech intelligibility measuring function

Abstract

The invention discloses a sound amplifying system with a classroom speech intelligibility measuring function. The sound amplifying system comprises a sound amplifying box, microphones, an audio host and the like; wherein the audio host adopts an improved STI indirect method to measure a speech transmission index; the sound amplifying box is used for amplifying lecture sounds of teachers and playing test excitation signals; the microphones are arranged at various measurement points in a classroom and used for receiving test signals and transmitting the received audio signals to the audio host;and a digital processing unit in the audio host processes the input digital signals, calculates the digital signals to obtain the speech transmission index (STI), and obtains the speech intelligibility of listening to the class at each measurement point according to the value of the STI. The method has the advantages of high precision, small error, real-time measurement, simultaneous measurement of a plurality of positions and the like, can eliminate measurement errors caused by individual voice differences of speakers, and can more accurately reflect the speech intelligibility of a real class.

Description

technical field [0001] The invention relates to the technical field of sound reinforcement systems, in particular to a sound reinforcement system with a classroom speech intelligibility measurement function. Background technique [0002] The sound reinforcement system usually refers to a system that amplifies the speaker's voice to the listener in real time, so that the speaker and the listener are in the same acoustic environment. The sound reinforcement system includes a sound reinforcement system and a sound field. A successful sound reinforcement system must be loud enough, sufficiently intelligible, and able to evenly cover the audience area. [0003] Most of the sound reinforcement systems now face a problem when they are in use, that is, how much the sound reinforcement gain of the sound reinforcement system should be adjusted to ensure that the audience area has a uniform sound field and sufficient clarity. Speech Transmission Index (STI) is an objective evaluation ...

AI Technical Summary

Problems solved by technology

But in fact, during the class, the clarity of the sound actually heard by the listeners is not only related to the acoustic characteristics of the room, but also related to the clarity of the speaker's own pronunciation. In addition, the sound reinforcement system installed in the classroom will also affect the clarity of the sound. influences

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