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我写信寻求帮助。

这是在 github 上找到的实时莫尔斯电码翻译器的代码示例。

我遇到了一个问题，正在寻找解决方案。

我的问题是，

首先，我通过麦克风输入莫尔斯电码音频并运行代码。但是，我不断收到“重置”消息。

解决方案似乎是调整四个手动变量（例如 FREQ、HzVARIANCE、ALLOWANCE、WINDOW 等）。你能知道我这些是什么意思吗？

谢谢，

from sys import byteorder
from array import array
from struct import pack

import pyaudio
import wave
import struct
import numpy as np

THRESHOLD = 300
#Chunks of data
chunk=480
FORMAT = pyaudio.paInt16
#Frames per second
RATE = 48000
window = np.blackman(chunk)
FREQ = 700
HzVARIANCE = 20
ALLOWANCE = 3
WINDOW = 160

letter_to_morse = {
    "a" : ".-", "b" : "-...",   "c" : "-.-.",
    "d" : "-..",    "e" : ".",  "f" : "..-.",
    "g" : "--.",    "h" : "....",   "i" : "..",
    "j" : ".---",   "k" : "-.-",    "l" : ".-..",
    "m" : "--", "n" : "-.", "o" : "---",
    "p" : ".--.",   "q" : "--.-",   "r" : ".-.",
    "s" : "...",    "t" : "-",  "u" : "..-",
    "v" : "...-",   "w" : ".--",    "x" : "-..-",
    "y" : "-.--",   "z" : "--..",   "1" : ".----",
    "2" : "..---",  "3" : "...--",  "4" : "....-",
    "5" : ".....",  "6" : "-....",  "7" : "--...",
    "8" : "---..",  "9" : "----.",  "0" : "-----",
    " " : "/"}


def is_silent(snd_data):
    "Returns 'True' if below the 'silent' threshold"
    return max(snd_data) < THRESHOLD

def normalize(snd_data):
    "Average the volume out"
    #32768 maximum /2
    MAXIMUM = 16384
    times = float(MAXIMUM)/max(abs(i) for i in snd_data)

    r = array('h')
    for i in snd_data:
        r.append(int(i*times))
    return r

def decode(list1):

    list1=list1.split("0")
    listascii=""
    counter=0


    for i in range(len(list1)):
        if len(list1[i])==0: #blank character adds 1
            counter+=1
        else:
            if counter<ALLOWANCE:
                list1[i]+=list1[i-counter-1]
                list1[i-counter-1]=""
            counter=0


    for i in range(len(list1)):
        if len(list1[i])>=20 and len(list1[i])<50:#200-490 ms dah, throws values >50
            listascii+="-"
            counter=0
        elif len(list1[i])<20 and len(list1[i])>5: #50-190ms is dit
            listascii+="."
            counter=0
        elif len(list1[i])==0: #blank character adds 1
            counter+=1
            if 40<counter<50 and len(list1[i+1])!=0: #370 ms blanks is letter space
                listascii+=" "
                counter=0
            elif counter==80: #80 ms blanks is word space
                listascii+="  "
                counter=0

    listascii=listascii.split(" ")


    stringout=""

    for i in range(len(listascii)):
        for letter,morse in letter_to_morse.items():
            if listascii[i]==morse:
                stringout+=letter
        if listascii[i]=="":
            stringout+=" "

    if(stringout!= " "):
        print(stringout)


def record():
    num_silent = 0
    snd_started = False
    oncount = 0
    offcount = 0
    status = 0
    timelist = ""

    p = pyaudio.PyAudio()
    stream = p.open(format=FORMAT,
            channels=1,
            rate=RATE,
                input=True,
            input_device_index=2,
            frames_per_buffer=chunk)


    #r = array('h')
    print("started")
    while True:

        #Reads audio data from stream
        snd_data = stream.read(chunk, exception_on_overflow = False)
        #Big endian to little endian byte sequence
        if byteorder == 'big':
            snd_data.byteswap()

        #Gets size of sample format
        sample_width = p.get_sample_size(FORMAT)

        #find frequency of each chunk
        indata = np.array(wave.struct.unpack("%dh"%(chunk), snd_data))*window

        #take fft and square absolute of each value
        fftData = abs(np.fft.rfft(indata))**2

        # find the index of the maximum
        which = fftData[1:].argmax() + 1

        silent = is_silent(indata)

        if silent:
            thefreq = 0
        elif which != len(fftData)-1:
            #Quadratic interpolation
            y0,y1,y2 = np.log(fftData[which-1:which+2:])
            x1 = (y2 - y0) * .5 / (2 * y1 - y2 - y0)
            # find the frequency
            thefreq = (which+x1)*RATE/chunk
        else:
            thefreq = which*RATE/chunk

        if thefreq > (FREQ-HzVARIANCE) and thefreq < (FREQ+HzVARIANCE):
            status = 1
        else:
            status = 0

        if status == 1:
            timelist+="1"
            num_silent = 0

        else:
            timelist+="0"
            num_silent += 1

        if num_silent > WINDOW and "1" in timelist:

            decode(timelist)
            timelist=""

        if num_silent > 1000:
            print("reset")
            num_silent =0

    print("ended")
    print(num_silent)
    p.terminate()

record()
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