On December 9, 2021, SGS, an internationally recognized testing, inspection and certification organization, and iFlytek successfully held the “SGS Awarded the World’s First Independent Wisdom Sound Amplification Certification for the XFES Series of iFlytek Educational Speakers” in Hefei in Hefei. Certificate ceremony. Gu Xiaoyu, Vice President of SGS China; Lu Binsi, Director of Northeast China and Automotive Services Division of SGS Consumer Electronics Division; Nie Xiaolin, Senior Vice President of iFLYTEK of HKUST; Fang Xiaowei, Deputy General Manager of Hardware Center of iFLYTEK of HKUST; BG of HKUST IFLYTEK Education Miao Lei, general manager of the smart window business line, attended the ceremony.
SGS awarded HKUST the world’s first independent Huijian and other clear sound amplification certification for the XFES series of educational speakers from HKUST
Gu Xiaoyu, Vice President of SGS China, said that this cooperation is a milestone for both of us. SGS helped HKUST IFLYTEK successfully obtain the world’s first independent Huijian and other clear sound amplification certification, which will help both parties in the future. Cooperate on a broader and deeper dimension. In the future, SGS will continue to pay attention to market demand and technical challenges, provide more quality solutions and multi-dimensional support, and promote the sustainable development of the industry with iFlytek with innovation and professionalism, leading the industry’s smart empowerment and quality upgrades.
Nie Xiaolin, senior vice president of iFLYTEK, said that AI empowered makes everything possible. Since its establishment, HKUST iFlytek has been engaged in core technology research for a long time and maintained the international cutting-edge technology level. I am very pleased that this in-depth cooperation with SGS has helped us to obtain the world’s first independent Huijian certificate for new educational speakers in the field of full-space equal loudspeaker and adaptive clear loudspeaker. It is also our achievement in innovative technology. A fruitful one. At the same time, we also look forward to establishing a long-term and stable cooperation with SGS, working hand in hand to lay a more solid foundation for the sustainable development of the global smart industry.
At the same time, Miao Lei, general manager of the BG smart window business line of iFLYTEK Education, said: This time we have specially invited SGS to conduct a rigorous test on our product. As an internationally renowned testing and certification organization, SGS has a strong authority on certification results. The test results show that the equal loudness speaker meets various relevant standards and can be awarded the SGS independent Huijian certificate. In the future, iFLYTEK and other loudness speakers will continue to innovate. At the same time, we also hope that iFLYTEK and SGS will continue to deepen cooperation in the future, continue to meet the needs of more customers from the perspective of users, and jointly escort product quality.
Shushan has a path, smart as a path, and the sound is on the scene, focusing on the classroom
The rapid development of artificial intelligence is promoting the structural reform of education, and my country’s education informatization is also rapidly moving from the 1.0 era to the 2.0 era. As a daily teaching class, if the classroom does not use a loudspeaker system, it will usually cause the students in the back row to be unable to hear the lecture content; but if a cheap and inferior loudspeaker system is used, there may be many problems after the loudspeaker, such as sound Intermittently, becoming harsh or dull, distorted tone, etc. Therefore, professional sound systems are particularly important. More and more companies are exploring how to provide a teaching environment with clear and comfortable sound reinforcement, balanced sound levels in various positions in the classroom, and no delay and no whistling.
As a well-known intelligent voice and artificial intelligence company in the Asia-Pacific region, iFlytek adheres to the core technology innovation at the source and the development strategy of “platform + track”. This year, it fully launched the XFES series of educational speakers. This series of products fully adopts the original J-shaped column acoustic structure design, unique speaker combination design, advanced software algorithm technology, professional audio transmission scheme and innovative AI on-site tuning method to achieve high-quality equal loudness and clear sound Effect.
Group photo of both parties at the scene
Quality cooperation and strong cooperation to create more value
During this cooperation with HKUST IFLYTEK, the SGS expert team conducted a comprehensive evaluation of the XFES series of HKUST IFLYTEK educational speakers from 7 dimensions, and all test results were at the leading level in the industry.
The final effect of the sound reinforcement not only depends on the sound reinforcement system itself, but also closely related to the space size and decoration layout of the classroom. HKUST iFlytek’s PA system has an APP adaptive adjustment function. Whenever it reaches a new environment, the APP can be used to quickly adaptively adjust the relevant parameters and algorithms to easily achieve equal loudness and clear effects.
Voice system transmission quality POLQA test
Test the quality of the sound reinforcement system product itself on the sound reinforcement transmission link, including: from the speaker to the power amplifier to the speaker output, including the processing of internal related chips and algorithms. The test result is >3.5 points, which means that the voice transmission quality of this link is good. The iFlytek product reached 3.89 points.
STIPA test of voice space transmission quality
Test the actual effect of the sound broadcast by the sound reinforcement system in the classroom space. The adaptively tuned sound reinforcement system should be able to match the actual classroom space and decoration environment, so that the users in the classroom can hear the amplified sound Clear and easy to understand. The test result> 0.62 points indicates that the sound reinforcement effect of the sound reinforcement system in this classroom space can achieve good clarity. HKUST iFLYTEK’s product measured up to 0.775 points, indicating that the clarity of spatial sound reinforcement is excellent, and the STIPA scores at different locations are also very close. The maximum difference is 0.11 points, which means that students in different positions in the classroom Both can hear the same intelligibility amplification.
Space equal loudness test
Test whether the loudness of the amplified lecture sound heard in different positions in the classroom is basically the same. The test result <4dBA means that the loudness heard in different positions feels almost the same. The largest difference in loudness at different positions of HKUST iFlytek products is 3.9dBA, which meets the requirements.
Amplification system delay test
Once there is a significant delay, the sound from the teacher’s mouth and the sound from the speakers will form an echo, which will also seriously affect the lecture and listening effects. The measured delay of iFlytek products is only 36 milliseconds, which is shorter than the standard value of 40 milliseconds.
The shortest howling distance test
In the past teaching, many teachers have encountered the situation of sound screaming, and the sound will make a harsh sound as soon as you walk around or even turn around. Once a squeal occurs in the middle of class, it will seriously affect the concentration of students in class. For teachers, in order to avoid this situation, they can only try not to move as much as possible, which seriously affects the performance of the class. The measured microphone and loudspeaker of iFLYTEK of HKUST has no howling beyond 20cm, which is much smaller than the required value of 50cm. It can satisfy the teacher’s free movement during class without worrying about being interrupted by howling.
Subjective evaluation of the clarity of the actual scene
The above six objective tests ensured the clarity of sound reinforcement to a certain extent, but the actual scene is difficult to ensure by relying on objective test data. Therefore, a comprehensive subjective evaluation method has been developed for actual evaluation. This subjective evaluation plan contains the following rigorous and comprehensive elements:
(1) The test corpus takes into account different variables such as male and female, young and middle-aged, Chinese, mathematics, and English;
(2) The evaluation includes 5 dimensions: sound reproduction, listening effort, listening comfort, low-frequency distortion and high-frequency distortion;
(3) Nine evaluators conduct tests in 9 different positions in the classroom;
(4) The evaluation adopts a blind test method of comparing similar products, allowing the evaluator to compare two different products to score more accurately, and the blind test makes the evaluator not know which of the two products tested is the product under test. , Which is the comparison product, ensures that the evaluators will not be biased because of the brand. The test result is >3.5 points, which means that the actual sound amplification effect of the product has reached a good level in terms of restoration, clarity, comfort, and fidelity, and achieves “clearness” in the true sense. The measured 3.71 points of the iFlytek product is a good proof that the sound reinforcement system has achieved a clear sound reinforcement effect in all directions.
As outstanding companies in their respective fields, iFLYTEK and SGS will leverage the brand advantages of both parties in the future to work together to create high-quality quality with innovation and professionalism, so that more consumers will have a safer and more convenient experience.
About HKUST iFLYTEK
A well-known intelligent voice and artificial intelligence listed company in the Asia-Pacific region. Since its establishment, it has been engaged in the research of core technologies such as speech and language, natural language understanding, machine learning reasoning and autonomous learning for a long time, and has maintained the international cutting-edge technology level; actively promote the research and development of artificial intelligence products Landing with industry applications, we are committed to making machines “can listen and speak, understand and think” and use artificial intelligence to build a better world. As a technological innovation enterprise, iFLYTEK adheres to the core technology innovation at the source, and has repeatedly achieved good results in various international evaluations such as machine translation, natural language understanding, image recognition, image understanding, knowledge graphs, knowledge discovery, and machine reasoning.