itc Classroom Sound System
Classroom sound system is a high definition, high fidelity and high stability sound system launched by itc for the teaching environment. It provides high-quality audio transmission environment and sound reinforcement effects for various functional activities in the classroom.
Classroom sound system introduction
itc classroom sound system has a built-in high-performance DSP processor and adopts audio algorithms such as automatic gain, adaptive feedback suppression, automatic equalization and environmental noise reduction, which can realize a wide range of sound pickup, and effectively prevent external noise interference and noise feedback caused by the phenomenon of screaming, showing a high-definition voice pickup function. To provide high-quality audio quality and sound amplification effects. itc classroom voice expansion system is flexible and convenient to use, which can free the hands of teachers and solve the problems such as low voice and long class difficulty.
Classroom sound system functions
Automatic sound field test
After the sound field test is turned on, the speaker will automatically emit noise for acoustic environment detection. After the automatic sound field adjustment is turned on, the processor will automatically adjust the balance to achieve a good sound reinforcement effect. Because the system needs to adapt to the acoustic environment, after the noise disappears, speak to the microphone continuously for about 20 seconds to complete the debugging. The user can turn on the hanging microphone with one key.
Automatic gain control
The processor adopts an advanced automatic gain control algorithm. By presetting a threshold, when the microphone picks up the audio signal below or above the threshold, the system will automatically give this audio signal gain boost or attenuation, make it close to the threshold position, and make it close to the threshold position. In this way, the input signal level of the microphone is controlled to be constant, so as to ensure that the students in the back row will not hear the teacher's voice because of the movement of the teacher's position.
Ambient noise cancellation
The hanging microphone has a high sensitivity and sound pickup range. While collecting the teacher's speech, it will also collect various disturbing noises in the environment, such as the sound of flipping books, the sound of fans, the noise generated by vehicles, wind noise, etc. In order to protect the target voice in the main direction and remove various interference noises in the environment, the system adopts an environmental noise elimination algorithm, which can effectively suppress more than 90% of the environmental noise, thereby reducing the environmental noise by up to 30dB to ensure the speech effect. The main principle is to cancel the noise sound wave by calculating the sound wave of the environmental noise and then generating an anti-phase wave.
Adaptive feedback suppression
The processor adopts the adaptive feedback suppression algorithm, through the adaptive filter to automatically adjust the input digital signal processing, to achieve the microphone acquisition of speaker reflection signal optimization, which can suppress the sound amplification system in the echo or roar.
"Hanging microphone - multimedia" sound system integration
The classroom sound system adopts a grouping output design, the front group only outputs multimedia audio sources, and the rear group can output all audio signals. Not only can make all students clearly hear the multimedia direct sound, but also can free the hands of the teacher, solve the problem that the students in the back row can not hear the teacher. When the signal detection function is enabled, the microphone automatically mutes when there is audio input IN the LINE IN order to avoid the second amplification of the microphone from the front speaker.
Add a part of the microphone amplification device to avoid microphone amplification for a second time. When the SPK detects audio input, the microphone will automatically mute and play multimedia audio normally. At the end of the broadcast, the microphone returned to normal.