Sound amplifying system with classroom speech intelligibility measuring function

A technology of language clarity and sound reinforcement system, which is applied in the field of sound reinforcement system, can solve problems such as the influence of sound clarity, and achieve the effect of small error, accurate reflection, and elimination of measurement error

Inactive Publication Date: 2020-10-09
杭州艾力特数字科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Sound amplifying system with classroom speech intelligibility measuring function
  • Sound amplifying system with classroom speech intelligibility measuring function
  • Sound amplifying system with classroom speech intelligibility measuring function

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Embodiment Construction

[0050] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0051] Such as figure 2 As shown, a sound reinforcement system provided by the present invention with the function of measuring speech intelligibility in a classroom is mainly composed of five parts, namely a microphone, a speaker, an audio host, a switch, and a computer. The audio host is divided into modules such as analog-to-digital conversion (A / D), digital signal processing unit (DSP), digital-to-analog conversion (D / A), and power amplifier.

[0052] Concrete implementation steps of the present invention are as follows:

[0053] Step 1: Use the sound reinforcement system to simultaneously measure the reverberation time at 8 different locations, and each location includes the reverberation time at 7 different frequencies. The 7 frequencies are 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz;

[0054] Step 2: Use the mic...

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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 ...

Claims

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Application Information

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IPC IPC(8): H04R27/00G10L25/51G10L25/78
CPCG10L25/51G10L25/78H04R27/00
Inventor 任军军孙旭光罗浩孙云云
Owner 杭州艾力特数字科技有限公司
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