Create a Callsign in a panadapter waterfall burte force method

brute-force-callsign-soundbyte

from scipy.io.wavfile import write
import numpy as np

samplerate = 44100

def get_piano_notes():
    '''
    Returns a dict object for all the piano 
    note's frequencies
    '''
    # White keys are in Uppercase and black keys (sharps) are in lowercase
    octave = ['C', 'c', 'D', 'd', 'E', 'F', 'f', 'G', 'g', 'A', 'a', 'B'] 
    base_freq = 1046.502 #Frequency of Note C4
    
    note_freqs = {octave[i]: base_freq * pow(2,(i/12)) for i in range(len(octave))}        
    note_freqs[''] = 0.0
    
    return note_freqs
    
def get_wave(freq, duration=0.5):
    amplitude = 4096
    t = np.linspace(0, duration, int(samplerate * duration))
    wave = amplitude * np.sin(2 * np.pi * freq * t)
    
    return wave
    
def get_chord_data(chords):
    chords = chords.split('-')
    note_freqs = get_piano_notes()
    
    chord_data = []
    for chord in chords:
        data = sum([get_wave(note_freqs[note]) for note in list(chord)])
        chord_data.append(data)
    
    chord_data = np.concatenate(chord_data, axis=0)    
    return chord_data.astype(np.int16)

def main():
        
    #Playing chords
    chords = 'Eg-EG-Ef-EF-Ef-EG-Eg-FfG-E-E-EFfG-Eg-Eg-FfG-f-FG-Eg-Eg-EFfGg-Eg-Eg-FfG-Eg-Eg-Eg-Eg-EG-Ffg-Eg-Eg-Eg-FG-FG-f-f'
    data = get_chord_data(chords)
    data = data * (16300/np.max(data))
    data = np.resize(data, (len(data)*5,))
    write('DM57_Call_Sign.wav', samplerate, data.astype(np.int16))
    
if __name__=='__main__':
    main()