Just an experimemt with sound. Produces a sound similar to used in old games. Formula: 10 * sqrt(x)

retro-rocket.py

"""Formula used: Frequency / Sample_rate * 10 * math.sqrt(x)
x is [0, Duration * Sample_rate)
"""

import wave
import struct
import math


def fpart(val):
    """Returns fractional part of the number"""
    return val - int(val)


class Sound():
    def __init__(self, frequency, duration, volume=1, channels=1):
        self.volume = volume * (2 ** 15 - 1)
        self.frequency = frequency
        self.channels = channels
        self.duration = duration

    SAMPLE_RATE = 44100
    BYTES_PER_FRAME = 2


def main():
    s = Sound(8_000, 2)
    fconst = s.frequency / Sound.SAMPLE_RATE

    # Init code
    f = wave.open("test.wav", "wb")
    f.setnchannels(s.channels)
    f.setsampwidth(Sound.BYTES_PER_FRAME)
    f.setframerate(Sound.SAMPLE_RATE)

    for x in range(int(s.duration * Sound.SAMPLE_RATE)):
        value = int(
            s.volume * fpart(fconst * 10 * math.sqrt(x))
        )
        f.writeframesraw(struct.pack("<h", value))

    print(s.frequency)
    f.writeframes(b"")


if __name__ == "__main__":
    main()