#----------------------------------------------------------------------
# Program to synthesize sine wave tones (either single or dual)
# See page 327 in the Companion
#
# Copyright (C) April 20, 2018 -- Dr. William T. Verts
#----------------------------------------------------------------------


#----------------------------------------------------------------------
# Generate a sine wave sound of one frequency
#----------------------------------------------------------------------

def SineWave (Frequency, Seconds=1.0, Amplitude=32767.0, SamplingRate=44100):
    TotalSamples = int(round(Seconds * SamplingRate))              # {Samples} = {Seconds} * {Samples/Second}
    MySound = makeEmptySound(TotalSamples, SamplingRate)           # Build an empty sound canvas containing the right number of samples
    RadiansPerSample = (2.0 * math.pi) * Frequency / SamplingRate  # {Radians/Sample} = {Radians/Cycle} * {Cycles/Second} / {Samples/Second}
    
    for I in range(TotalSamples):
        Angle = I * RadiansPerSample
        Value = Amplitude * math.sin(Angle)
        setSampleValueAt(MySound, I, int(Value))  
    return MySound
    
#----------------------------------------------------------------------
# Generate a sine wave sound of two mixed frequencies
#----------------------------------------------------------------------

def DualSineWave (Frequency1,Frequency2, Seconds=1.0, Amplitude=32767.0, SamplingRate=44100):
    TotalSamples = int(round(Seconds * SamplingRate))     # Seconds * (samples/second)
    MySound = makeEmptySound(TotalSamples, SamplingRate)
    RadiansPerSample1 = (2.0 * math.pi) * Frequency1 / SamplingRate
    RadiansPerSample2 = (2.0 * math.pi) * Frequency2 / SamplingRate
    
    for I in range(TotalSamples):
        Angle1 = I * RadiansPerSample1
        Angle2 = I * RadiansPerSample2
        Value1 = Amplitude * math.sin(Angle1)
        Value2 = Amplitude * math.sin(Angle2)
        setSampleValueAt(MySound, I, int((Value1+Value2)/2.0))  
    return MySound
    
#----------------------------------------------------------------------
# Generate a dual tone sound, play it, and save it to a sound file
# with a .WAV extension.  See page 331 for frequencies to mix to 
# generate DTMF Touch-Tone(TM) frequencies (playing a DTMF tone into
# the handset of a land-line phone dials that digit). 
#----------------------------------------------------------------------
    
def Main():
    Frequency1 = requestInteger("Enter Frequency 1")
    Frequency2 = requestInteger("Enter Frequency 2")
    MySound = DualSineWave(Frequency1,Frequency2)
    play(MySound)
    writeSoundTo(MySound,pickAFolder() + "Sound.wav")
    return