With 6 high-fidelity directional microphones are evenly hoisted to achieve sound acquisition in the classroom, and microphones. The collected sound is processed by professional audio processor for de-noising, mixing and echo cancellation, and then output to the recording and playback owner. Machine and video file mixed encoding generated standard MP4 file saving.
Environmental noise will be collected by microphones along with the speaker's voice. Even in a well-decorated indoor environment, there will be a variety of noises such as fans, air conditioners, personnel moving around, table and chair contact and so on. The built-in automatic noise reduction algorithm of the system can effectively identify and suppress the noise signal in the collected sound signal, and carry out the output sound amplification after effectively eliminating the noise.
In the process of audio-visual interactive teaching between the local classroom and the remote classroom, due to the unreasonable audio system setting, it is often the case that the body voice of the classroom is amplified in the remote classroom and then collected and transmitted through the microphone of the remote classroom to be heard locally, resulting in poor sound experience for both parties. The system of this scheme can compare the input audio signal collected with the output signal waveform of the previous time, so as to identify the echo signal with the same waveform and filter it to achieve the effect of eliminating the echo and ensure the clear fidelity of the audio.
The system has built-in intelligent gain adjustment function. Regardless of the sound size of the audio source, the audio system will automatically adjust to the predetermined gain range for output after collection, and can maintain the overall sound expansion balance in the classroom, to ensure that the audience's hearing sense is balanced and comfortable automatically under the condition of different teachers' voices.
