Intelligent Unobtrusive Sound Reinforcement System Solution for Classroom

Why do you need an intelligent unobtrusive sound reinforcement system?

 The pain point of traditional classroom sound reinforcement

● In the past, there used to be a unique "scenery" on campus. When the bell for class preparation rang, teachers would wear miniature microphones on their chests and carry "little bee" amplifiers (Voice Amplifiers for Teachers) on their waists, fully equipped as they rushed to the classrooms. Soon, the sounds of all sizes of speakers echoed through the teaching building, occasionally accompanied by a sharp whistle.

● Although the price of the voice amplifiers is affordable, the product quality is uneven, the sound produced is hoarse and some volume is too loud, which will inevitably negatively impact students' hearing, especially the students in the front seats. Even if the fixed gooseneck or wireless microphone is used, there are also varying degrees of trouble in the teaching process, such as the physical and verbal expression of the teacher being constrained, the classroom sound quality being unstable, frequent failures, management difficulties and other problems, reduce students' interest in class, difficult to reflect the teaching effect fully.

Solution Design-Intelligent Unobtrusive Sound Reinforcement System 

● The essence of the intelligent unobtrusive sound reinforcement scheme is to extend the effective pickup distance of the microphone and ensure the 1-2 meters activity space of the spokesperson under the condition that the sound reinforcement in the fixed scene will not cause howling. The product advantage of hanging microphones is that teachers can get rid of the shackles of their hands and make it "unobtrusive and transparent”, to ensure that the local sound is clear and loud when the teachers walk around freely in the covered area, to better play themselves and improve the teaching quality.

●The unique Smart Mixing and Microphone Preference technology allows the system to be configured with both a close-talk microphone (gooseneck/handheld) and hanging directional microphone and supports smart mixing and switching. Whether it's classroom instruction, a presentation or whiteboard writing, there is an optimal pickup method for seamless switching, perfectly balancing the convenience of teaching with the pickup of high-quality sound.

● The DSPPA conference system manufacturer intelligent unobtrusive sound reinforcement system is equipped with intelligent unobtrusive pickup microphones, which are independently developed by DSPPA technology so that the details of sound pickup and processing are more organic and coordinated. At the same time, the one-touch mute function can block classroom noise at any time. It is undoubtedly advanced in terms of product concepts.

Function Advantage

Noise howling feedback suppression technology

● Local sound reinforcement will inevitably produce howling problems. The traditional acoustic feedback suppression technology is developed based on the close-talk microphone (handheld microphone/gooseneck microphone), which has limited sound reinforcement gain, and the speech is limited to the short distance of the microphone, which is difficult to meet the sound reinforcement needs of free teaching in education informatization.

● The key to solving free lectures is long-distance sound pickup. Therefore, the microphone can be installed in places far away from the teacher, such as booms and ceilings, so that there will be no restriction on the teacher's actions. However, long-distance pickup will bring two important problems: one is that the feedback stability margin is compressed, and it is more likely to cause howling in local sound reinforcement than close-talk microphones; the other is that it is easier to pick up a lot of noise, resulting in deterioration of signal-to-noise ratio. The keolving these two problems is advanced Adaptive Feedback Cancellation (AFC) and Automatic Noise Suppression (ANS).

Multi-channel mixing feedback suppression technology

● Sound transmission gain is the most important index to measure the sound reinforcement system. Typically, doubling the number of microphones in the same PA system will reduce the gain by about 3 dB, and for intelligent unconscious sound reinforcement, this value will be even greater. Therefore, most unconscious sound reinforcement systems have chosen a single microphone solution, which creates several limitations in pickup range. To perfectly solve this problem, multi-channel mixing feedback suppression technology is needed.

Long-distance sound recognition technology

● The long-distance speech algorithm framework developed by DSPPA has a leading advantage in solving the above key problems. Its multi-channel feedback suppression, echo cancellation and noise suppression all adopt the most advanced algorithm theory. After dozens of version iterations, it gradually overcomes the technical problems that have not been solved for a long time in the field of intelligent unobtrusive sound reinforcement and greatly improves the sound reinforcement gain, echo cancellation range and noise reduction range, so that the unobtrusive sound reinforcement can achieve satisfactory results in terms of sound transmission gain and sound quality. It not only performs well in teaching sound reinforcement scenes but also has an excellent performance in theatres with high sound quality requirements. This is also attributable to the excellent and rich tuning modules built into the system host, including high-pass and low-pass filters, parametric equalizers, limiters, and compression limiters.

Sound Reinforcement Scheme with Single Microphone

Applied to sound reinforcement in a 10*5 meter classroom podium area

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Sound Reinforcement Scheme with Two Microphones

Applied to sound reinforcement in a 10*8 meter classroom podium area

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Sound Reinforcement Scheme with Three Microphones

Applied to the interactive sound reinforcement of teachers and students in 20*10 meters smart classroom

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Work with Recording & Broadcasting Systems

Explanation of Matching the Recording & Broadcasting System

● Applied to high-quality recording and broadcasting classrooms, it is equipped with unobtrusive sound reinforcement to free the hands of the teacher, ensuring that the local sound reinforcement sounds clear and loud when the teacher walks around the coverage area at will so that he can better develop himself and improve the quality of teaching.

● Design a set of intelligent teaching unobtrusive sound reinforcement hosts, and perform intelligent processing such as AFC, AEC, ANS, and AGC on the microphone pickup, to meet the access of microphones and line signals, avoid the use of analogue or digital mixing console, and reduce the complexity of the use of the operation, making it easy for users to operate.

● With a set of long-distance wireless receiving collar clip microphones and wireless handheld microphones, you can walk out of the podium and use it for interactive sound reinforcement with students.

● 4-camera recording camera, combined with tracking close-up, and real-time recording restores on-site teaching. Cooperating with the recording and broadcasting host and intelligent unobtrusive sound reinforcement system, it can perfectly transmit the sound, images and live broadcast situation. You can also save the playback and send it to parents to help children learn at home.

● With a visualized touch screen, you can observe the scene in real-time to ensure that the output is no problem. With one key click, you can start recording and save the recording automatically.

● In The class observation room, one can not only observe the scene situation with one-way glass but also with active monitoring audio, the real-time output of the scene sound. Without disturbing the students' class, it can perfectly record the class situation.

Distribution chart with recording & broadcasting solution