On September 17, the "2026 Changan Automobile Innovative Technology & Ecosystem Cooperation Exhibition (September Session)", co-hosted by Changan Automobile and the Society of Automotive Engineers of Chongqing, was successfully held at Changan Automobile Global R&D Center.
Landtop Technologies Exhibition Team
As a leading full-spectrum solution provider for acoustics and vibration, Landtop Technologies was invited to the exhibition. Centered on the electroacoustic testing requirements of automotive intelligent cabins, the company showcased the technical capabilities of AaSQ in standardized testing, automated analysis and objective evaluation, covering typical application scenarios such as emergency call, hands-free calling, voice interaction and in-vehicle audio performance. It provides strong support for vehicle and component manufacturers in compliance verification, R&D testing and cabin acoustic experience optimization.
Scene of the Exchange Session
During the event, Liu Wenji, Minister of the Flight Simulation Project Department at Landtop Technologies, delivered a keynote speech titled From Regulatory Compliance to User Experience – Application of AaSQ in Automotive Intelligent Cabins. He illustrated how AaSQ translates regulatory requirements into quantifiable, executable and traceable automated testing workflows.
Liu Wenji on AaSQ Application in Automotive Intelligent Cabin Electroacoustic Testing
Regulatory Standards and Cabin Experience Jointly Drive Electroacoustic Testing Upgrading
As intelligent cabin functions grow increasingly diverse, users have raised higher requirements for call clarity, voice recognition accuracy, interaction response speed and the listening experience of in-vehicle audio systems. Under road driving, multi-person interaction and complex usage scenarios, ensuring clear and smooth calls, accurate and efficient voice interaction, and natural and balanced audio playback has become a key topic in the development and verification of cabin acoustic performance.
In 2025, China’s domestic standard system for in-vehicle electroacoustic testing was further improved. GB/T 45314-2025 Road vehicles — Performance requirements and test methods for hands-free calling and voice interaction was released on February 28, providing a unified basis for relevant performance evaluation. GB 45672-2025 In-vehicle emergency call system was issued on April 25 and will take effect on July 1, 2027; it references the call quality requirements specified in the aforementioned standard.
Changes in Standard System and Compliance Requirements
The release of the two standards further clarifies compliance requirements for emergency call systems and supports standardized testing of in-vehicle hands-free calling and voice interaction performance.
In response to regulatory changes and user demands, electroacoustic testing for intelligent cabins shall combine subjective evaluation and objective testing, focus on users’ real-world perception, and conduct quantitative assessment via objective indicators. Adopting standardized test environments, test methods and automated workflows can greatly improve the consistency, repeatability and traceability of test results.
Three Core Test Scenarios Cover Cabin Electroacoustic Testing Requirements
To address the above challenges, Landtop Technologies has developed the AaSQ intelligent cabin electroacoustic testing system with independent intellectual property rights. It deeply integrates functions including signal generation, data acquisition, analysis and evaluation, background noise playback, data management and automatic report generation, delivering a domestic testing solution for cabin electroacoustic performance verification.
The system covers three core test scenarios: emergency call and hands-free calling, voice interaction, and in-vehicle audio performance. Through standardized and automated quantitative testing, it helps R&D engineers accurately evaluate and optimize cabin acoustic experience.
Three Core Test Scenarios
a) Emergency Call and Hands-Free Calling
Tests are performed for items including time delay, frequency response, loudness rating, echo suppression, double-talk performance and background noise transmission, to assess whether both communicating parties can interact timely, clearly and naturally. It provides a basis for evaluating and improving the call quality performance of in-vehicle hands-free calling and emergency call systems.
b) Voice Interaction
Tests cover the full workflow of wake-up, recognition, execution and response to evaluate indicators such as voice wake-up rate, sentence recognition accuracy, interaction success rate and response time. The system supports corpus recording and management, background noise playback, test process audio recording and result statistics. Automated tests can be organized via CAN interface and Python scripts.
c) In-Vehicle Audio Performance
Performance of the vehicle audio system is evaluated through indicators including frequency range, maximum sound pressure level, total harmonic distortion, sound field non-uniformity and independent sound zone isolation. It also provides support for speaker system tuning and cabin listening experience optimization.
For end users, the core advantage of AaSQ lies in building an automated test workflow covering signal generation, data acquisition, analysis & evaluation, result judgment and report generation.
C-QUEST Chinese Speech Model: Correlation between Objective Scoring and Subjective Evaluation Reaches 88.7%
Landtop Technologies has developed the C-QUEST objective evaluation model for Chinese speech quality to meet the assessment requirements of Chinese voice calls. Developed based on subjective test results of Chinese speech and trained through feature analysis and neural network algorithms, the model correlates subjective auditory perception evaluation with objective scoring.
C-QUEST vs Spanish-Trained Speech Quality Model: Evaluation Result Comparison
Verification results show that compared with non-Chinese speech models, the correlation coefficient between subjective scores and objective results of the C-QUEST model reaches as high as 88.7%, enhancing the reliability of objective calculation results for call quality in Chinese speech scenarios.
Deep Expertise in Acoustics and Vibration Testing to Boost Intelligent Cabin Quality
Founded in 1998, Landtop Technologies has long specialized in the field of acoustics and vibration, committed to delivering comprehensive, professional and customized technical solutions for customers. Drawing on extensive project experience and technological accumulation, Landtop provides a full portfolio of integrated solutions including acoustic test hardware and software, forward test scheme development, technical consultation for acoustic and vibration R&D and testing, as well as planning, design and construction of acoustic laboratories.
This exhibition participation and technical exchange marks an important practice for Landtop to deeply integrate into China’s complete vehicle industrial chain. Going forward, Landtop will continue to focus on the electroacoustic testing sector, iterate domestic testing technologies and solutions, strengthen collaborative R&D with OEMs, and support the upgrade of audio quality for domestic intelligent cabins.
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