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| waveProc <- function(y, samples, sample_size, freq){ | |
| options(digits=10) | |
| require("signal") | |
| meas <- matrix(nrow = 50, ncol = 0) | |
| dimnames(meas) = list(c(seq(1,50)), c() ) | |
| mag_list = c() | |
| samples <- NROW(y) | |
| n <- NROW(y)-1 | |
| T <- as.numeric(sample_size)*as.numeric(samples) | |
| dt <- T / n | |
| t <- seq(0,T,by=dt) | |
| #FOURIER WORK | |
| Y <- fft(y) | |
| im <- Im(Y) | |
| re <- Re(Y) | |
| mag <- abs(Y) | |
| mag <- mag/(max(mag)) | |
| mag_list <- c(mag_list, mag) | |
| mag_matrix <- matrix(mag_list, nrow=NROW(y), ncol=1) | |
| mag <- apply(mag_matrix,1,mean) | |
| #FREQ ARRAY | |
| samp_freq <- 1/as.numeric(sample_size) | |
| nyq_freq <- (samp_freq/2) | |
| bin_resolution <- nyq_freq / (length(Y)/2) | |
| f <- seq(0,samp_freq,bin_resolution) | |
| #detecta fundamental | |
| limite <- ifelse(mag > 0.7,mag,0) | |
| limite_diff <- diff(limite) | |
| ff_id <- which(limite_diff < 0)[1] | |
| f_fundamental <- f[ff_id] | |
| bins <- seq(f_fundamental,f_fundamental*50,by=f_fundamental) | |
| meas_series <- sapply(bins, | |
| function(b){ | |
| b_id <- which( round(b) == round(f) ) | |
| mag[b_id] | |
| }) | |
| meas <- cbind(meas, meas_series) | |
| X <- matrix(1, NROW(y), 2) | |
| X[,1] <- cos(2*pi*bins[1]*t); | |
| X[,2] <- sin(2*pi*bins[1]*t); | |
| beta <- lm(y ~ X) | |
| phase_ini <- (atan2(beta$coefficients[[2]],beta$coefficients[[3]])*180)/pi | |
| get_phase <- function (freq, offset){ | |
| X = matrix(1, NROW(y), 2) | |
| X[,1] <- cos(2*pi*freq*t+offset); | |
| X[,2] <- sin(2*pi*freq*t+offset); | |
| beta <- lm(y ~ X) | |
| ampt <- sqrt(beta$coefficients[[2]]^2+beta$coefficients[[3]]^2) | |
| phase <- ((atan2(beta$coefficients[[2]],beta$coefficients[[3]])*180)/pi) | |
| return(phase) | |
| } | |
| offset_angle <- get_phase(freq, 0) | |
| offset_correction <- (offset_angle*pi)/180 | |
| out_ampt <- meas_series[1:40] | |
| out_phase <- sapply(seq(1,40), | |
| function(n){ | |
| get_phase(freq*n, offset_correction*n) | |
| }) | |
| return(list(amplitude=out_ampt, phase=out_phase)) | |
| } |
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