我刚开始使用 GRC。我正在尝试从 fsk 设备解码数据。我用 rtl_433 -a -t（I/Q 2 通道 uint8）抓取数据，消除噪声、正交解调、低通滤波器、中心波和二进制切片。所以我明白了：
从这里开始我如何获得位转换/数据包？我也尝试过时钟恢复但没有成功（获得的数据与图表不符。
附：如何在第一个“位”之前剪切抓取的数据？这是我的输出 Demod vs Binary slicing。如果我导出二进制文件，我会得到很多 0（由信号前的长线引起）。所以之后...
谢谢
【问题讨论】：
我制作了一个 python 脚本来获取数据。 它写的 Bad and Fast 但它有效：
import os.path
import string
import sys
import math
def print_buf(counter, buf):
buf2 = [('%02x' % ord(i)) for i in buf]
print '{0}: {1:<39} {2}'.format(('%07x' % (counter * 16)),
' '.join([''.join(buf2[i:i + 2]) for i in range(0, len(buf2), 2)]),
''.join([c if c in string.printable[:-5] else '.' for c in buf]))
def process(file_path):
data = ""
with open(file_path, 'r') as f:
counter = 0
firstBit = 0
while True:
buf = f.read(16)
if not buf:
break
if buf.encode('hex') == "00000000000000000000000000000000":
#print "No data"
if firstBit == 1:
#print "0Data"
data = data + buf.encode('hex')
else:
firstBit = 1
#print "1Data"
data = data + buf.encode('hex')
#print counter
#print buf.encode('hex')
#work_data(counter,buf)
# print_buf(counter, buf)
counter += 1
clean_data(data)
def clean_data(data):
data = data.replace("00","0")
data = data.replace("01","1")
data_start = data.find("1")
data = data[data_start:]
data_stop = data.rfind("1")
data = data[:data_stop+1]
try:
bit_size(data)
except Exception, e:
os.remove(sys.argv[2])
print "Errore, File Rimosso", sys.argv[2]
#print data
def bit_size(data):
#Set one 1 bit max length (evaluated by setting var to an high value and get result)
var1 = 30
#Set one 0 bit max length (evaluated by setting var to an high value and get result)
var2 = 30
#Get timing from preamble, on eval set it to an high value (best to all file)
var3 = 10
output=""
flag1 = ""
flag0 = ""
avg1 = 0
avg0 = 0
min0 = 100
max0 = 0
min1 = 100
max1 = 0
count1 = 0
count0 = 0
sizer = data
count3 = 0
count4=0
count5=0
while len(sizer) > 1 and count3 <=var3:
#print len(sizer)
if sizer[:1] == "1":
flag1 = sizer.find("0")
#print "Size 1 " , flag1
sizer = sizer[flag1:]
if flag1 < var1 and flag1 > 0:
print "Size 1 ", flag1
avg1 += flag1
count1 +=1
count3 += 1
count4 +=1
if flag1 > max1:
max1 = flag1
if flag1 < min1:
min1 = flag1
else:
flag0 = sizer.find("1")
sizer = sizer[flag0:]
#print "Size 0 " , flag0
if flag0 < var2 and flag0 >0:
print "Size 0 ", flag0
avg0 += flag0
count0 += 1
count3 += 1
count5 += 1
if flag0 > max0:
max0 = flag0
if flag0 < min0:
min0 = flag0
#print avg0, avg1, count0, count1
avg0=avg0/count5
avg1=avg1/count4
mod0=math.fmod(avg0,count5)
mod1=math.fmod(avg1,count4)
print "0--> Media:" , avg0, "Max:" , max0, "Min:",min0, "Resto:", mod0
print "1--> Media:" , avg1, "Max:" , max1, "Min:",min1, "Resto:", mod1
sizer = data
Smax1=0
Smin1=0
Savg1=0
Smax0=0
Smin0=0
Savg0=0
Cavg0=0
Cavg1=0
Scor0=0
Scor1=0
while len(sizer) > 1:
if sizer[:1] == "1":
flag1 = sizer.find("0")
sizer = sizer[flag1:]
Nmax1 = flag1 / max1
Nmin1 = flag1 / min1
Navg1 = flag1 / avg1
Smax1+=Nmax1
Smin1+=Nmin1
Savg1+=Navg1
Mmax1=math.fmod(flag1,max1)
Mmin1=math.fmod(flag1,min1)
Mavg1=math.fmod(flag1,avg1)
if Mavg1 > 5:
Cavg1 = Navg1 + 1
else:
Cavg1 = Navg1
Scor1 += Cavg1
output += "1" * Cavg1
#print "1--> Size:", flag1, "EstByMin:", Nmin1, "EstByMax:", Nmax1, "EstByAvg:", Navg1, "RestoDaMedia:", Mavg1, "RestoDaMin:", Mmin1, "RestoDaMax:",Mmax1, "Correzione:", Cavg1
else:
flag0 = sizer.find("1")
sizer = sizer[flag0:]
#print "Size 0 " , flag0
if flag0 > 0:
Nmax0 = flag0 / max0
Nmin0 = flag0 / min0
Navg0 = flag0 / avg0
Smax0+=Nmax0
Smin0+=Nmin0
Savg0+=Navg0
Mmax0=math.fmod(flag0,max0)
Mmin0=math.fmod(flag0,min0)
Mavg0=math.fmod(flag0,avg0)
if Mavg0 > 5:
Cavg0 = Navg0 + 1
else:
Cavg0 = Navg0
Scor0 += Cavg0
output += "0" * Cavg0
#print "0--> Size:", flag0, "EstByMin:", Nmin0, "EstByMax:", Nmax0, "EstByAvg:", Navg0, "RestoDaMedia:", Mavg0, "RestoDaMin:", Mmin0, "RestoDaMax:",Mmax0, "Correzione:", Cavg0
#print "1--> TotByMin:" , Smin1, "TotByMax:",Smax1, "TotByAvg:",Savg1,"TotByCorr:", Scor1
#print "0--> TotByMin:" , Smin0, "TotByMax:",Smax0, "TotByAvg:",Savg0,"TotByCorr:", Scor0
#print "---> TotByMin:" , Smin0+Smin1, "TotByMax:" ,Smax1+Smax0, "TotByAvg:", Savg1+Savg0, "TotByCorr:", Scor0+Scor1
#print output
data_rec(output)
def data_rec(input):
byte=""
count = 1
precount = 0
predebug = ""
debug = input
while input[:1] == "1":
input = input[1:]
while input[:2] == "01":
precount+=2
predebug += "01"
input= input[2:]
##print "--------------------------------------"
##if precount > 0:
##print "Preamble --> OK", predebug, " Count:" , precount
##else:
##print "Preamble? -->", debug
##os.remove(sys.argv[2])
preamble=input
#print preamble
preamble = ' '.join(preamble[i:i+8] for i in range(0, len(preamble), 8))
#print preamble
output = ''.join(hex(int(a, 2))[2:] for a in preamble.split())
#print output
data = input[34:]
data = ' '.join(data[i:i+8] for i in range(0, len(data), 8))
#print data
data = ''.join(hex(int(a, 2))[2:] for a in data.split())
#print data
for a in data:
byte+=a
if math.fmod(count,2) == 0:
byte+=" "
count+=1
print " "
##print byte
##print "ByteCount:" , count
print preamble
##print "File:" , sys.argv[2]
##print "--------------------------------------------------"
if __name__ == '__main__':
if not os.path.exists(sys.argv[1]):
print >> (sys.stderr, "The file doesn't exist.")
sys.exit(1)
process(sys.argv[1])
【讨论】：