Technical Scheme List

This solution is a targeted offering by Beijing Doewe Technology Co., Ltd. for testing in-vehicle audio components that use the A²B protocol, encompassing both A²B microphone testing solutions and A²B speaker testing solutions. As automobiles adopt new infotainment technologies, advanced driver assistance systems (such as cameras, microwave radars, and lidar), and a variety of sensors to measure different data (including stability, speed, and acceleration), the number of electronic systems inside vehicles has increased, and their complexity has reached a new level, posing significant challenges to communication buses. Various buses used by many different subsystems involve highly complex (and costly) cables. For automotive applications, size and weight have become new challenges because meeting new environmental regulations means the need to develop new systems capable of, for example, reducing CO₂ emissions.

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.

Due to the lack of DAB signal coverage in China, the R&D and verification of in-vehicle DAB functions face challenges. This article introduces the verification methodology: R&D testing requires controllability of radio frequency signals, physical layers, channel parameters, etc., and RWC2010C can meet these needs with support for multiple modulations and baseband multiplexing; QA or vehicle-wide verification focuses on user experience, and RFCS can collect reflected radio frequency signals with high precision; HEXYLON can collect operator ETI code streams and detect radio frequency indicators. The combination of these three "magic tools" (RWC2010C, RFCS, HEXYLON) enables tests such as radio frequency indicator detection, code stream collection and modulation, which helps verify the in-vehicle DAB functions and enhance product competitiveness.

In the era of CDR/FM digital-analog simulcasting, Beijing Doewe Technology Co., Ltd. provides a series of broadcast signal testing solutions. It can conduct comprehensive testing on various indicators of broadcast signals, whether in terms of transmitter performance, signal reception quality, or signal coverage effect, so as to optimize the listening experience of the audience.

This article provides a testing solution using Redwood Comm's broadcast signal generator RWC2010C, emergency broadcast tester RWC2100F, and the core function software *Service Linking Test Tool*. As the third-generation broadcasting technologies, DAB and DRM digital broadcasting have now been widely applied in more than 20 different countries or regions, with a variety of applications based on these technologies. In-vehicle broadcasting is one of the most typical application scenarios. As the world's largest automobile exporter, China's demand for research and testing of this technology is increasing day by day. In the practical application of in-vehicle broadcasting, such a problem may occur: when a user crosses from one service area to another, listening may be interrupted because they leave the coverage of the original signal. To avoid this problem, it is necessary to use replaceable services in the user's current area to ensure the continuity of the user's listening. This application is called service following.

This solution is a targeted one launched by Beijing Doewe Technology Co., Ltd. for the testing of in-vehicle audio components using the A²B protocol, including the A²B microphone testing solution and the A²B speaker testing solution. As automobiles adopt new infotainment technologies and advanced driver assistance systems (such as cameras, microwave radars, lidar, etc.), as well as various sensors to measure different data (stability, speed, acceleration, etc.), the number of electronic systems inside automobiles has increased, and their complexity has reached a new height, which also brings huge challenges to the communication bus. Various buses used by many different subsystems include very complex (and expensive) cables. For automotive applications, size and weight are new challenges, because meeting new environmental regulations means the need to develop new systems that can (for example) reduce CO₂ emissions.

CDR (China Digital Radio), namely China Digital Audio Broadcasting, is a mobile multimedia broadcasting technology with independent intellectual property rights in China, developed under the auspices of the State Administration of Press, Publication, Radio, Film and Television. The portable broadcast tester FMH is specially designed for broadcast signal testing. Its testing architecture, based on world-leading radio frequency basic hardware, ensures the professionalism of FMH. FMH not only supports traditional AM and FM testing and can monitor AM and FM broadcasts, but also can conduct detailed testing on China Digital Audio Broadcasting (CDR) signals.

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.

A very important part of DAB applications is the data channel (DATA CHANNEL: SLS/EPG/SPI/DLS). How to conduct data channel testing has become a topic in the field of testing and measurement, and this article can guide you in detail on how to use our company's signal generator RWC2010C for special testing. The article provides methods and steps for testing SLS, EPG, SPI, and DLS. Among them, SLS testing can be carried out using PAD or Packet Data channels, and PNG format image files can be downloaded to RWC2010C for testing. EPG testing can be performed via PAD or Packet Data channels, allowing editing of the start time and duration of programs. SPI testing can utilize PAD or Packet Data channels and can be configured as a secondary component of existing DAB services. DLS testing can be done using PAD, with the ability to edit DLS strings.

This article mainly introduces three DAB Announcement test schemes and conducts a comparative analysis. With the RWC2010C equipment provided by Doewe Technology, DAB Announcement tests can be carried out very efficiently, various simple or complex test scenarios that comply with standards can be constructed, and tests can be repeated. This can improve the R&D, production and quality inspection efficiency for radio manufacturers or car audio manufacturers.

This document mainly explains three DAB Announcement testing schemes: the one based on ETI streams, the one based on IQ-acquired data streams, and the one based on professional RF test instruments, as well as a summary and comparison of these three testing schemes and a brief introduction to typical instruments. Announcement is a very important part of DAB in practical applications. Therefore, how to test Announcement has become a topic worthy of research in the field of testing and measurement. Whether to select an appropriate ETI test stream for functional verification or to conduct functional testing through underlying parameter configuration is a question that any engineer needs to consider before starting this test.

This article introduces the key technologies of DAB and DRM digital broadcasting as well as their development trends at home and abroad.