![]() The high CW decoding accuracy rate depends on the quality of the signal on the one hand, and on the other hand it has a lot to do with the size of the signal input. The signal detection indication can be transmitted to your main controller panel through the interface and displayed synchronously to check the size of signal input and decoding status. However, these two LEDs are invisible after they are actually installed in a case. There are two LEDs on the board, which are power indication and signal detection indication. Note that this is a non-isolated control port). The interface starting from the USB port is defined as: CW audio input (connected to the audio output of radio), CW audio output (can be connected to headphones or speakers, must be a stereo jack, inserting a mono plug will cause output short-circuit protection and cause no sound) and a CW and PTT output interface (the left and right channels of the stereo jack control the external output of CW and PTT respectively. The USB interface of the decoder board is a Type-C interface, which is used for external power supply or system firmware upgrade. Given that the current CW machine decoding is still difficult to replace manual dictation, machine CW decoding can only be used as an auxiliary means of CW dictation receiving at present, and cannot totally rely on machine decoding. The better the signal, the higher the signal-to-noise ratio, and the higher the decoding accuracy. The decoding accuracy is directly proportional to the quality of the signal and the signal-to-noise ratio. Therefore, effectively separating CW signals from short-wave backgrounds has always been a recognized problem, so it is limited by hardware itself and software algorithm, the decoding accuracy of CW signals is difficult to reach 100%. In recent years, short-wave band electromagnetic interference has become increasingly serious, and short-wave signals have the characteristics of great fading and poor signal-to-noise ratio. ![]() Compared with the basic version of decoder board, the upgraded version adds several filter options and a variety of digital noise reducer settings, which can effectively improve the sound quality of received signal, reduce shortwave noise, and improve decoding accuracy to a certain extent. Suitable for CW audio signal recognition of shortwave radios and walkie-talkies. The newly designed DSP CW audio decoder board (upgraded version) is used to identify CW audio signals. DSP CW Audio Decoder Board DAC Expansion Board Upgraded Version For Shortwave Morse Telegraph Code
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