Intelligent Unobtrusive Sound Reinforcement System - Classroom Application Solution

Why do you need an intelligent unobtrusive sound inforcement system?

The pain point of traditional classroom sound reinforcement
● In the past, a distinctive scene unfolded on campus. When the bell signaling class preparation rang, teachers adorned miniature microphones on their chests and carried compact "little bee" amplifiers (Voice Amplifiers for Teachers) on their waists, rushing equipped to the classrooms. Subsequently, the teaching building resonated with the sounds of speakers of various sizes, occasionally punctuated by a sharp whistle.
● Despite the affordability of these voice amplifiers, the product quality varies, resulting in hoarse sounds and occasionally excessively loud volumes. This can adversely affect students' hearing, particularly those seated in the front rows. Even with the use of fixed gooseneck or wireless microphones, teaching encounters varying degrees of inconvenience. Issues such as restricted physical and verbal expression of teachers, unstable classroom sound quality, frequent malfunctions, management challenges, and other complications can diminish students' interest in class and hinder the complete realization of teaching effectiveness.

Solution Design-Intelligent Unobtrusive Sound Reinforcement System
● The core of the intelligent inconspicuous sound reinforcement system lies in extending the effective pickup range of the microphone while ensuring a 1-2 meters activity space for the speaker, without causing feedback in fixed scenes. Hanging microphones offer the advantage of freeing teachers from the constraints of handheld devices, creating an "unobtrusive and transparent" experience. This ensures clear and robust local sound when teachers move freely within the covered area, allowing them to fully engage and enhance the quality of teaching.
● The unique Smart Mixing and Microphone Preference technology enables the system to incorporate both close-talk microphones (gooseneck/handheld) and hanging directional microphones. This supports intelligent mixing and seamless switching, providing an optimal pickup method for various scenarios such as classroom instruction, presentations, or whiteboard writing. This balanced approach ensures convenience in teaching without compromising on the quality of sound pickup.
● DSPPA's intelligent unobtrusivesound reinforcement system features specially developed pickup microphones, seamlessly integrating sound pickup and processing. The one-touch mute function effectively suppresses classroom noise, showcasing an advanced product concept.

Function Advantage 1

Noise howling feedback suppression technology
● Local sound reinforcement inevitably leads to howling issues. Traditional acoustic feedback suppression technology is designed for close-talk microphones (handheld or gooseneck), which have limited sound reinforcement gain and confine speech to the microphone's short distance. This limitation makes it challenging to meet the sound reinforcement requirements of flexible teaching in educational digitization.
● The crucial factor in addressing open lectures is achieving long-distance sound pickup. Therefore, microphones can be strategically placed in locations distant from the teacher, such as booms and ceilings, allowing unrestricted movement. However, long-distance pickup introduces two significant challenges: firstly, the compression of feedback stability margin, making it more prone to howling in local sound reinforcement compared to close-talk microphones; secondly, an increased susceptibility to capturing ambient noise, resulting in a decline in the signal-to-noise ratio. The solution to these challenges lies in advanced Adaptive Feedback Cancellation (AFC) and Automatic Noise Suppression (ANS) technologies.

Function Advantage 2

Multi-channel mixing feedback suppression technology
● The most critical parameter for evaluating a sound reinforcement system is the sound transmission gain. In a conventional PA system, increasing the number of microphones typically results in a reduction of gain by approximately 3 dB. This effect is even more pronounced in intelligent inconspicuous sound reinforcement systems. Consequently, many inconspicuous sound reinforcement systems opt for a single-microphone solution, introducing limitations to the pickup range. To effectively address this challenge, a solution requires the implementation of multi-channel mixing feedback suppression technology.

Function Advantage 3

Long-distance sound recognition technology
● The DSPPA-developed long-distance speech algorithm framework exhibits a leading edge in addressing the aforementioned critical challenges. Its multi-channel feedback suppression, echo cancellation, and noise suppression incorporate state-of-the-art algorithm theories. Through numerous version iterations, it has successfully tackled longstanding technical issues in the realm of intelligent inconspicuous sound reinforcement. The framework significantly enhances sound reinforcement gain, expands echo cancellation and noise reduction ranges, resulting in satisfactory outcomes for inconspicuous sound reinforcement in terms of sound transmission gain and sound quality. Notably, it excels not only in educational sound reinforcement scenarios but also demonstrates outstanding performance in theaters with stringent sound quality requirements. The system's host is enriched with exceptional and versatile tuning modules, including high-pass and low-pass filters, parametric equalizers, limiters, and compression limiters.

Function Advantage 4

Priority Override Function
● Mic 4 Priority: When setting up both a wireless handheld microphone and a hanging directional microphone, the microphone 4 priority button facilitates intelligent mixing for simultaneous output or allows for the switching of priority output to the wireless handheld microphone.
● Music Priority: In the presence of a signal input from the line, the system will automatically mute the microphone signal. Conversely, if there is no signal input, the system will automatically restore the microphone signal.

One-click Mute
● The system is equipped with a standard desktop mute button and a one-key mute button. Additionally, it features an automatic microphone signal mute function.

Built-in Power Amplifier
● The devices are furnished with four-channel constant resistance 8-ohm output power amplifier channels, each capable of delivering a maximum of 150W. This allows convenient connection to constant-resistance teaching speakers, minimizing the requirements for power amplifier access and streamlining the space utilization.

Function Advantage 5

Optional built-in wireless microphone

With built-in wireless microphone external antenna interface, wireless microphone can receive signals to achieve remote handheld sound reinforcement through the antenna.

Optional PPT page turning function

The page-turning pen communicates with the host computer, and then connects to the computer or interactive flat panel through the corresponding USB cable to achieve intelligent remote page-turning PPT.

Optional network decoding signal

With built-in network interface., it supports IP broadcast docking, decoding broadcast transmission network signals, remote transmission docking broadcast paging , class ringing and other functions

Optional recording & broadcasting and interactive transmission

Built-in remote audio input and output ports, recording and broadcasting of teaching audio interaction, the other party's audio source is played to the local, and the local audio is transmitted to the other party. Use with interactive recording & broadcasting system.

Function Advantage 6

Optional Control Panel

An external control panel controls the volume level and mute of microphones and music to control device operation.

Optional computer input isolated noise

Change the input end of the built-in audio isolator, effectively isolate the noise caused by the potential difference between computers and digital devices and this equipment.

Optional 2.4G Wireless Microphone

Connected to 2.4G wireless receiver, 2.4G microphone can be used for local sound reinforcement.

Optional external speakers and amplifiers

Stereo audio output can be decoded, connected with high power amplifier or old sound system can be used.

Sound Reinforcemnet Scheme with Single Microphone

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

● A small common classroom, 10M long, 5M wide, 3M high, an area of 50m².
● Develop a configuration comprising a set of intelligent hanging directional microphones strategically installed above the podium area to fulfill the requirement for discreet audio capture.
● Design an intelligent teaching sound system host that is inconspicuous, incorporating features like AFC, AEC, ANS, AGC, and other intelligent processing. Ensure compatibility with both microphone and line signal access, eliminating the necessity for analog or digital mixing consoles. Simplify operation, reducing complexity for a more user-friendly experience.
● Craft a system consisting of two main speakers, coupled with a professional amplifier, wall-mounted on both sides of the classroom. This arrangement caters to the daily sound reinforcement needs of the classroom environment.

Product List:

Order	Model	Name	QTY
1	DSP9275	Intelligent Unobtrusive Sound System Host	1
2	DSP9274	Intelligent Hanging Directional Microphone	1
3	DSP8064B	Wall Mount Speaker	2

Sound Reinforcemnet Scheme with Two Microphones

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

● A medium-size common classroom, 10M long, 8M wide, 3M high, an area of 80m².
● Create a configuration involving two sets of intelligent unobtrusive directional microphones strategically installed above the lectern area to seamlessly achieve imperceptible audio pickup.
● Develop an intelligent teaching sound system host that is inconspicuous, integrating advanced features such as AFC, AEC, ANS, AGC, and other intelligent processing. Ensure compatibility with both microphone and line signal access, eliminating the necessity for analog or digital mixing consoles. Simplify operation to reduce complexity and enhance user-friendliness.
● Craft a system comprising two main speakers, coupled with a professional amplifier, and wall-mounted on both sides of the classroom. This arrangement caters to the daily sound reinforcement needs of the learning environment.

Product List:

Order	Model	Name	QTY
1	DSP9275	Intelligent Unobtrusive Sound System Host	1
2	DSP9274	Intelligent Hanging Directional Microphone	2
3	DSP8064B	Wall Mount Speaker	2

Sound Reinforcemnet Scheme with Three Microphones

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

● A medium-size common classroom, 20M long, 10M wide, 3M high, an area of 200m².
● Devise a setup featuring three sets of intelligent unobtrusive directional microphones strategically installed above the lectern area to seamlessly achieve imperceptible audio pickup.
● Create an intelligent teaching sound system host that is inconspicuous, integrating advanced features such as AFC, AEC, ANS, AGC, and other intelligent processing. Ensure compatibility with both microphone and line signal access, eliminating the necessity for analog or digital mixing consoles. Simplify operation to reduce complexity and enhance user-friendliness.
● Design a comprehensive system incorporating four high-power speakers, accompanied by two professional amplifiers. These speakers are to be strategically wall-mounted in front of the training classroom and the middle wall. This arrangement covers both the front and back areas, meeting the sound reinforcement needs in large spaces and ensuring optimal audio quality for the audience.

Product List:

Order	Model	Name	QTY
1	DSP9275	Intelligent Unobtrusive Sound System Host	1
2	DSP9274	Intelligent Hanging Directional Microphone	3
3	MX1500II	Stereo Amplifier	2
4	D6563	Professional Speaker	4
5	D5815	Wireless Microphone Host	1
6	D5811	Wireless Handheld Microphone	1
7	D5812	Wireless Collar Microphone	1

Work with Recording & Broadcasting System

Product List:

Order	Model	Name	QTY
1	DSP9275	Intelligent Unobtrusive Sound System Host	1
2	DSP9274	Intelligent Hanging Directional Microphone	1
3	DSP8064B	Wall Mount Speaker	2
4	DSP9212	Student Panoramic Camera	1
5	DSP9212	Student Close-up Camera	1
6	DSP9212	Teacher Panoramic Camera	1
7	DSP9212	Teacher Close-up Camera	1
8	DSP9221	Visualized Touch Screen	1
9	DSP9233	Ominidirectional Microphone	2
10	D6641H	Audio Processor	1
11	DSP9204	Recording & Broadcasting System Host	1
12	D6572II	Power Supply Sequence Controller	1
13	DSP6604	Monitor Speaker	1
14	D5815	Wireless Microphone Host	1
15	D5811	Wireless Handheld Microphone	1
16	D5812	Wireless Collar Microphone	1
17	DCP-8686	Intelligent Interactive Flat Panel	1

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 host, and perform intelligent processing such as AFC, AEC, ANS, AGC on the microphone pickup, to meet the access of microphones and line signals, avoid the use of analog 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 microphone and wireless handheld microphone, 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, real-time recording restores on-site teaching. Cooperate 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 calss observation room, it can not only observe the scene situation with one-way glass, but also with active monitoring audio, 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