If you've read this far, you may be interested in the older version of this tool which does not attempt to adapt to the sound and also includes more diagnostic information. The volume threshold is the value (0-255) which the measured volume in the analysed frequency must exceed to be counted as a dit or dah. The volume filter (which uses dB) discards very quiet (very negative) or very loud (close to zero) sounds and scales the size of the remaining data. There are three parameters which are not automatic: the minimum and maximum volume filter settings and the volume threshold setting. The frequency can only be certain values and the closest allowed value will be chosen. If you want to fix the frequency or speed then click on the "Manual" checkboxes and type in your chosen values.
#Gortzel cw decoder code#
In fully automatic mode, the decoder selects the loudest frequency and adjusts the Morse code speed to fit the data. From these timings it determines if something is a dit, dah, or a sort of space and then converts it into a letter shown in the message box. If the volume in the chosen frequency is louder than the "Volume threshold" then it is treated as being part of a dit or dah, and otherwise it records a gap (this is shown in the lower graph that looks like a barcode). The spectrogram of the sound is shown in the main graph along with a pink region showing the frequency being analysed. Here you can find an other danish ham which have been working on the code Here a project from a oz1edr oz1edr.dk/Arduino%20Uno/CW%20dekoder/Arduino%20CW.htmĪnd another link and in a USA ham newspaper decoder will analyse sound coming from the microphone or from an audio file. Here you can see Mr.Chiba very fine website /entry/2015/28Īnd here you can see how JA9MAT Hidehiko build it with chinese letters Download Mr.
#Gortzel cw decoder download#
Here you can download the code : Download version 1.1 Right click on the mouse and chose save as. If you get a lot of noise in when you have your volumen on the prefereed place then set the 2 values up with 50. easy to build cw decoder based on dsp goertzel code if you want to build a cw decoder without using other active components than an atmel 328 arduino uno then this is sure something for you. If you know ahead of time what the audio frequency of your Morse code tone will be, you can implement a Goertzel filter that will detect the presence or absence of that tone (as illustrated in this white paper). It calculates only one frequency component of the DFT. here they are 100, if your transiver shall be turned up to get the decoder working then set the values down. The Goertzel algorithm is essentially a single tone detector. Go 50 up or 50 down with both of them in same time. If you have trouble with the audio is to high og to weak yo can try to set the 2 values for magnitude. NOW YOU CAN USE THE DECODER WITHOUT ANY MORE MODIFICATIONSīut if you want another center frequency you and want to change how wide the filter shall be, you have to change the following lines also.īe aware of that you can only chose some excact frequencies and only a specified number of samples.įor a start take the n=48 ( testdata ) and then you can chose 558 hz or mabye 744 hz which are good for recieveing. Then you have to set which pin you use for AudioIN and which pin you use for the Led. The magic in this code is the tone detection based on the goertzel formular, which means that you just put in the audio on an analog pin and then the processor make some calculations and if there is a tone you will get a magnitude value. Tell the liquidcrystal library which pins you use for the display and underneath that which kind of display you have If you want to build a cw decoder without using other active components than an atmel 328 - Arduino UNO, then this is sure something for you. just connect and then the code will manage when you have done the setup. The code can take different kinds of displays 2*16 or 4*16 or 2*20 or 4*20. Just 2 10k resistors betwen gnd and 5 volts and then a capacitor in serie with the audio signal. A Arduino UNO board and a LCD board and then a few components. You can read about the goertzel formular here :Ĭourses.cs./courses/cse466/12au/calendar/Goertzel-EETimes.pdf
Hardware build by OZ2HNS for use in our clubstation OZ8SMA Here is a video where you can see the decoder in function. If you want to build a cw decoder without using other active components than an atmel 328 - Arduino UNO, then this is sure something for you. EASY BUILD CW DECODER BASED ON DSP GOERTZEL CODE
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