When dealing with the cross-frequency problem of walkie-talkie, we usually adjust the sub-audio parameters to ensure clear and stable communication. Subaudio technology has become a key element in the design of walkie-talkie, which significantly improves the overall performance of the equipment. This paper will deeply discuss the concept and function of subaudio technology to help readers better understand this technology.

Special audio technology

Sub-audio technology is a special audio technology, also known as CTCSS or continuous voice control squelch system. It improves the communication quality by adding a frequency lower than audio (67Hz-250.3Hz) to the call signal.

The working principle of subaudio

After receiving the signal, the interphone will demodulate the secondary audio signal from the intermediate frequency. After filtering and shaping, the signal will be transmitted to CPU for further analysis. The CPU will compare it with the preset CTCSS frequency and decide whether to enable the mute function.

Advantages of digital control squelch system

Continuous digital control squelch system is a digital squelch control technology, which provides more accurate and reliable performance. Although its function is similar to CTCSS, the main difference lies in the digital coding method.

Improve communication quality and stability.

Whether using CTCSS or continuous digital control squelch system, their main goal is to improve the communication quality and stability of walkie-talkie. By properly adjusting and using these technologies, you can ensure a clear and interference-free communication experience in various environments.