Rec de Padrões - sons erro

# busca os sons de erro com a taxa em 0.775

x = read.delim("C:/Users/Windows 7/test.txt", header=F)
x = x[,1]
n = length(x)
delta_t = 60/n
d = 1000
x = c(x, 0*(1:d))
n = length(x)
x11(); plot(seq(0,len = n, by = delta_t), x, xlab = "t[s]", ylab = "intensity [?]", type = "l", col = "grey")

S = NULL
s = seq(1,n, by = d)
for (i in 2:length(s)) {
  b = abs(x[s[i-1]:(s[i]-1)])
  a = s[i-1]:(s[i]-1)
  z = smooth.spline(a,b)
  S = rbind(S, cbind(z$x, z$y))
}
b = abs(x[s[i]:n])
a = s[i]:n
z = smooth.spline(a,b)
S = rbind(S,cbind(z$x,z$y))
S[(S[,2] < 100), 2] = 0
x11(); plot(seq(0,len = n, by = delta_t), x, xlab = "t[s]", ylab = "intensity [?]", type = "l", col = "grey")
points(seq(0, len = n, by = delta_t), S[,2], type = "l")
x11(); plot(seq(0,len = n, by = delta_t), x, xlab = "t[s]", ylab = "intensity [?]", type = "l", col = "grey", xlim = c(30.5,31)) #mudar o tempo aqui
points(seq(0, len = n, by = delta_t), S[,2], type = "l")
x11(); plot(S[,1], S[,2], type="l")
t1 = round(30.5/delta_t)
t2 = round(31/delta_t)
abline(v = c(t1,t2), col = "blue", lwd = 2)
k = t1 <= S[,1] & S[,1] <=t2
M = cbind(S[k,])
m = nrow(M)
D = 0*S[,1]
for (i in 1:(n-m+1)) { 
	D[i] = cor(M[,2], S[i:((i+m)-1),2]) 
}
x11(); plot(seq(0,len = n, by = delta_t), D, xlab = "t[s]", ylab = "correlation", type = "l", col = "blue")
mask = D > 0.77
mask = which(mask)
mask = mask[which(diff(mask)>3) - 1]
x11(); plot(S[,1],S[,2], type = "l")
abline(v = S[mask,1], col = "red")
E = S[mask,1]*delta_t
E = cbind(floor(E), round((E-floor(E))*24/0.99))
E = unique(apply(E,1,paste, collapse = ":"))