Technical Scheme List

This article presents a professional broadband RF recording and playback solution using the broadband RF recording and playback system MP7600 Plus and its supporting software BroadCMS. The broadband RF recording and playback system MP7600 Plus is a professional RF recording and playback equipment system, which is an ideal tool for RF engineers in field signal testing and collection. A single unit features real-time RF signal analysis, recording, and playback functions, with a maximum real-time RF signal analysis, recording, and playback bandwidth of 100MHz, and supports adjustable bandwidth from 2MHz to 100MHz. It also has spectrum analysis and power measurement functions, which can meet different application needs. The customized software can support timing settings, automatic switching, starting, and stopping of recording for signals in different frequency bands within the working frequency range. It allows real-time output while supporting signal analysis and recording, and can play cyclically during signal playback. Thanks to the excellent RF performance and strong functional expandability of the broadband RF recording and playback system MP7600 Plus, this system will also develop more application scenarios in future engineering projects.

This article elaborates on the basic concepts of sound pressure-related characteristic quantities—auditory threshold sound pressure, instantaneous sound pressure, peak sound pressure, and effective sound pressure, as well as the calculation of sound pressure level.

This solution is a Bluetooth radio frequency conformance testing scheme launched by Beijing Doewe Technology Co., Ltd. in accordance with Bluetooth radio frequency specifications. It supports Classic Bluetooth (BR/EDR) and Bluetooth Low Energy (BLE) technologies, as well as the Bluetooth Core Specification up to version 5.2 (with continuous updates). With the upgrading and iteration of Bluetooth technology, more and more products have begun to use Bluetooth as a carrier for information transmission, and its application scenarios have been continuously expanding, including consumer electronics, automotive electronics, smart home appliances, industry, medical care and other multiple fields. According to the requirements of the Bluetooth Special Interest Group (SIG), any Bluetooth device must pass Bluetooth protocol testing and certification before it can enter the market. Therefore, in the process of research and development and production, it is crucial to conduct radio frequency conformance testing on Bluetooth devices to ensure that their wireless indicators meet the requirements of Bluetooth radio frequency specifications.

In the field of electronic device research and development, the performance of analog-to-digital converters (ADCs) directly determines the quality of the system, so the ADC testing is essential. ADC testing usually needs to be evaluated from multiple aspects such as accuracy, power consumption, and transmission speed to ensure that it can meet the requirements for accuracy and reliability in design needs and practical applications. How to achieve accurate ADC testing amid numerous influencing factors such as noise interference, signal distortion, and environmental fluctuations? The audio analyzer A10 provides engineers with an excellent ADC testing solution.

This article mainly shares some testing methods for the indicator of the effective frequency range of loudspeakers. This indicator is specified in Part 5 of the "GB/T 12060 Acoustic System Equipment" series of standards: Methods for Testing Main Performance of Loudspeakers. In addition, it is also frequently mentioned in testing standards for other audio-related products. If you have any questions about the testing methods for this indicator, it is hoped that the sharing in this article can provide you with some inspiration.

This solution will introduce the POLQA testing scheme for perceived audio quality analysis from four aspects: the development history of audio and video product testing, introduction to POLQA, POLQA testing scheme, and introduction to core equipment. In recent years, the forms and application scenarios of online audio and video products have become increasingly rich, and the development of the epidemic has accelerated the transition from offline to online in many industries. With the normalization of online communication, the technical application of audio and video has become more and more widespread. The participation of major manufacturers such as ZOOM, Tencent, and Alibaba has led to a rapid improvement in the quality of this field. In this field, good audio and video quality and good user experience are the key factors to stand out in the fierce competition. In addition to online meetings and other methods, in various calls, regardless of the terminal communication equipment used or the network relied on, the quality of voice has always been an important indicator for evaluating call performance.

This article elaborates on the testing methods of radio frequency (RF) recorders and players in various application scenarios, including fault diagnosis of wireless communication and radar systems, spectrum monitoring and management, military exercises and electronic warfare training, navigation satellite signal testing, automotive electronics testing, and testing in complex electromagnetic environments.

This solution aims to provide a reference audio testing scheme for the production and research and development of intelligent video doorbell products, using scientific and rigorous measurement methods to test the audio performance indicators of the products.

This article mainly introduces the concept and origin of Bluetooth, as well as the development process of several standard changes and technical updates experienced by Bluetooth technology versions.

This article presents a testing solution that fully complies with the GB4943.1-2022 standard, covering testing for complete devices, players, headphones, and safety warnings, thus meeting the requirements of standard testing in various scenarios.Headphones are common items in our daily lives; we often use them to listen to music, watch TV, make calls, and so on. During the use of headphones, prolonged exposure to high volume can cause irreversible damage to our ears. To regulate the sound level when using headphones and protect our ears from harm, the European Union introduced the EN50332-1 standard in 2000, which specifies the maximum sound pressure level for the combined system of a player and headphones. In 2004, the EN50332-2 standard was launched, stipulating the maximum output voltage for standalone player testing and the broadband characteristic output voltage for headphones. With the popularization of smart products, the EN50332-3 standard was further introduced, focusing on safety specifications for smart headphones and players.

This solution is mainly based on an audio analyzer and a network impairment simulator, and reflects the audio transmission quality of real-time calling software during use through POLQA (Perceptual Objective Listening Quality Assessment) subjective sound quality evaluation tests. Real-time calling software transmits signals based on mobile network links. The network impairment simulation equipment supporting this test solution adds different network impacts to the transmission link to simulate the use of the software in different network environments, thereby measuring audio transmission quality that is closer to real application scenarios. The test solution introduced in this article uses an audio analyzer to test the MOS score with one click, and this solution is also equipped with most of the test equipment and accessories that may be used during the test, which can help users quickly set up a test environment and conduct tests.

Based on the testing procedures specified in *GY/T 274-2013 Technical Indicators and Measurement Methods for Digital Mixers, this article introduces how to use an audio analyzer to test the indicators of the analog input - analog output interfaces of digital mixers.

This article details how to use an audio analyzer to test the frequency response and distortion of some common headphone products.