Correlation bfsk fir design
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/target
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audio
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3665
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edition = "2024"
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[dependencies]
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eframe = "0.32.3"
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egui_plot = "0.33.0"
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hound = "3.5.1"
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plotters = "0.3.7"
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Skibidi Toilet[1],[2] est une web-série[3] machinima, créée par Alexey Gerasimov et diffusée sur sa chaîne YouTube DaFuq!?Boom! Produite à l'aide de Source Filmmaker, la série suit une guerre fictive entre des toilettes à tête humaine et des personnages humanoïdes dotés d'appareils électroniques à la place de la tête.
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Après la publication du premier court métrage en février 2023, Skibidi Toilet devient un mème Internet viral sur divers réseaux sociaux, en particulier au sein de la génération Alpha. Les critiques ont vu dans cette série la première incursion de la génération Alpha dans la culture Internet, en concurrence avec la génération Z, plus âgée.
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Synopsis
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Skibidi Toilet raconte les événements d'une guerre fictive entre des hommes à tête de caméra, de haut-parleur ou de télévision, et les Skibidi Toilets, une race extraterrestre prenant l’apparence de toilettes avec des têtes d'hommes ou de femmes et n'ayant que comme langage le « Skibidi ». Dirigés par le G-Toilet (personnage inspiré du G-Man dans la série de jeux vidéos Half-Life[4]), ils ont comme ambition de conquérir la Terre, en éliminant toute opposition[5],[6]. G-Toilet, qui est sous les ordres des Astro-Toilets, sa race d'origine qui se trouve dans l'espace, doit conquérir la terre avec l'armée qu'il a créée sur Terre, finira par perdre sa confiance aux Astros dû à sa défaite à l'épisode 57 et à sa dispute à l'épisode 60 avec les deux soldats d'élite des Astros. À partir de l'épisode 74, les Astros ont commencé à envahir la Terre. Les Skibidi Toilets et l'alliance n'ont d'autre choix que de s'allier pour vaincre les Astros.
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@ -5,13 +5,3 @@ Après la publication du premier court métrage en février 2023, Skibidi Toilet
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Synopsis
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Skibidi Toilet raconte les événements d'une guerre fictive entre des hommes à tête de caméra, de haut-parleur ou de télévision, et les Skibidi Toilets, une race extraterrestre prenant l’apparence de toilettes avec des têtes d'hommes ou de femmes et n'ayant que comme langage le « Skibidi ». Dirigés par le G-Toilet (personnage inspiré du G-Man dans la série de jeux vidéos Half-Life[4]), ils ont comme ambition de conquérir la Terre, en éliminant toute opposition[5],[6]. G-Toilet, qui est sous les ordres des Astro-Toilets, sa race d'origine qui se trouve dans l'espace, doit conquérir la terre avec l'armée qu'il a créée sur Terre, finira par perdre sa confiance aux Astros dû à sa défaite à l'épisode 57 et à sa dispute à l'épisode 60 avec les deux soldats d'élite des Astros. À partir de l'épisode 74, les Astros ont commencé à envahir la Terre. Les Skibidi Toilets et l'alliance n'ont d'autre choix que de s'allier pour vaincre les Astros.
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Production
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Illustration de Skibidi Toilet.
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Alexey Gerasimov (russe : Алексей Герасимов, né en 1997 ou 1998[4]), crée sa chaîne YouTube DaFuq!?Boom! le 6 juin 2016. Lors d'une interview du site web Cartoon Brew, Alexey révèle qu'il est enseignant en animation en autodidacte depuis neuf ans[7]. Il utilise le logiciel Source Filmmaker et explique : « Cela me permet de travailler plus facilement et plus rapidement avec les ressources dont j'ai besoin pour l'animation, la réalisation, l'écriture et le montage moi-même, bien que j'aie une personne qui m'aide à obtenir les actifs dont j'ai besoin[7]. »
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|
||||
Vers la fin de l'année 2022, deux mèmes apparaissent sur Internet, le premier sur l'État américain d'Ohio, la présentant comme un état qui serait infesté de phénomènes paranormaux où il ne faudrait absolument ne pas y mettre les pieds ; le deuxième sur un remix de la musique Give It to Me de Timbaland avec Nelly Furtado et Justin Timberlake en featuring.
|
||||
|
||||
Dorkiopork, ami d'Alexey Gerasimov et animateur de vidéos drôles et de web-séries sur Source Filmmaker est déjà connu sur YouTube[5]. Dorkiopork a donné l'idée d'associer les deux mèmes pour créer la série Skibidi Toilet. C'est le 8 février 2023 qu'il sort leur fameux short nommé « Skibidi Toilet in Ohio », faisant référence au mème sur l'Ohio et donc aux phénomènes paranormaux qui s'y passent (selon le mème) puis en utilisant le remix de Give It to Me.
|
||||
|
||||
La vidéo connaît un succès retentissant aux États-Unis et peu de temps après, dans le monde entier. DaFuq!?Boom! s'empresse alors de créer d'autres vidéos sur le sujet. Après 8 shorts créés, il décide de faire de Skibidi Toilet une réelle web-série à partir du 9e épisode. Par la suite, Dorkiopork abandonne le projet pour se concentrer sur sa santé mentale, tandis que DaFuq!?Boom! continue de produire les animations.
|
||||
|
||||
52
src/bfsk.rs
52
src/bfsk.rs
@ -3,7 +3,8 @@
|
||||
use std::f32::consts::PI;
|
||||
|
||||
use crate::complex::{Complex, Complex32};
|
||||
use crate::fft::{self, FFT, FFTDirection, windows};
|
||||
use crate::fft::{self, FFT, FFTDirection};
|
||||
use crate::{units, windows};
|
||||
use crate::map;
|
||||
use crate::nco::Nco;
|
||||
|
||||
@ -54,6 +55,52 @@ impl<'a, T: Iterator<Item = bool>> Iterator for BFSKMod<'a, T> {
|
||||
}
|
||||
}
|
||||
|
||||
// FSK Demodulator (dumb non coherent + no symbol timing recovery)
|
||||
// By correlation
|
||||
pub struct BFSKDem {
|
||||
samples_per_bit: u32,
|
||||
deviation: f32,
|
||||
// State
|
||||
sample_index: u32,
|
||||
|
||||
// Correlators
|
||||
pos_correlator: Box<[Complex32]>,
|
||||
neg_correlator: Box<[Complex32]>,
|
||||
}
|
||||
|
||||
impl BFSKDem {
|
||||
pub fn new(samples_per_bit: u32, deviation: f32) -> Self {
|
||||
|
||||
let mut nco_pos = Nco::new(deviation);
|
||||
let mut nco_neg = Nco::new(-deviation);
|
||||
|
||||
BFSKDem {
|
||||
samples_per_bit,
|
||||
deviation,
|
||||
sample_index: 0,
|
||||
|
||||
pos_correlator: (0..samples_per_bit).map(|_| {nco_pos.step(); nco_pos.cexp()}).collect(),
|
||||
neg_correlator: (0..samples_per_bit).map(|_| {nco_neg.step(); nco_neg.cexp()}).collect()
|
||||
}
|
||||
}
|
||||
|
||||
pub fn demod(&mut self, baseband: &[Complex32]) -> bool {
|
||||
assert!(baseband.len() >= self.samples_per_bit as usize);
|
||||
|
||||
|
||||
//perform correlation
|
||||
let positive_energy: Complex32 = self.pos_correlator.iter().zip(baseband.iter())
|
||||
.enumerate()
|
||||
.map(|(i, (a, b))| *a * *b * windows::blackmann(i as f32 / self.samples_per_bit as f32)).sum();
|
||||
let negative_energy: Complex32 = self.neg_correlator.iter().zip(baseband.iter())
|
||||
.enumerate()
|
||||
.map(|(i, (a, b))| *a * *b * windows::blackmann(i as f32 / self.samples_per_bit as f32)).sum();
|
||||
|
||||
positive_energy.mag().powi(2) < negative_energy.mag().powi(2)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
// FSK Demodulator (dumb non coherent + no symbol timing recovery)
|
||||
pub struct BFSKDem {
|
||||
samples_per_bit: u32,
|
||||
@ -77,7 +124,7 @@ impl BFSKDem {
|
||||
samples_per_bit,
|
||||
deviation,
|
||||
sample_index: 0,
|
||||
fft: FFT::new(samples_per_bit as usize, windows::bartlett),
|
||||
fft: FFT::new(samples_per_bit as usize, windows::blackmann),
|
||||
bin_pos: bin_index as usize,
|
||||
bin_neg: (samples_per_bit - bin_index - 1) as usize, // -deviation = negative frequency = upper half
|
||||
}
|
||||
@ -93,3 +140,4 @@ impl BFSKDem {
|
||||
positive_energy.mag() > negative_energy.mag()
|
||||
}
|
||||
}
|
||||
*/
|
||||
|
||||
@ -130,11 +130,3 @@ impl Sum for Complex32 {
|
||||
iter.fold(Complex32::zero(), |acc, el| acc + el)
|
||||
}
|
||||
}
|
||||
|
||||
impl<T> Deref for Complex<T> {
|
||||
type Target = Complex<T>;
|
||||
|
||||
fn deref(&self) -> &Self::Target {
|
||||
self
|
||||
}
|
||||
}
|
||||
|
||||
@ -7,9 +7,9 @@ pub mod radix2;
|
||||
use crate::{
|
||||
complex::Complex32,
|
||||
fft::{
|
||||
dft::NaiveDFT, mixed_radix::MixedRadixFFT, rader::RaderFFT, rader2::Rader2FFT,
|
||||
dft::NaiveDFT, mixed_radix::MixedRadixFFT, rader2::Rader2FFT,
|
||||
radix2::Radix2FFT,
|
||||
},
|
||||
}, windows,
|
||||
};
|
||||
|
||||
pub type FFTWindow = fn(f32) -> f32;
|
||||
|
||||
@ -34,7 +34,6 @@ impl DFTAlgorithm for Rader2FFT {
|
||||
let g = compute_prime_primitive_root(size);
|
||||
let permutations: Box<[usize]> = (0..(size - 1)).map(|i| exp_mod(g, i + 1, size)).collect();
|
||||
let sub_size = next_pow2(2 * size - 3);
|
||||
println!("{}", sub_size);
|
||||
|
||||
// Compute fourrier transform of twiddle factors
|
||||
let twiddle_factors = (0..sub_size)
|
||||
|
||||
@ -1,2 +1,2 @@
|
||||
mod fir;
|
||||
mod impulse_response;
|
||||
pub mod fir;
|
||||
pub mod impulse_response;
|
||||
|
||||
@ -4,52 +4,36 @@ use std::collections::VecDeque;
|
||||
|
||||
use crate::complex::Complex32;
|
||||
|
||||
pub struct FIRFilter<T>
|
||||
where
|
||||
T: Iterator<Item = Complex32>,
|
||||
|
||||
pub struct FIRFilter
|
||||
{
|
||||
size: usize,
|
||||
normalization: f32,
|
||||
impulse_response: Box<[Complex32]>,
|
||||
taps: VecDeque<Complex32>,
|
||||
input: T,
|
||||
}
|
||||
|
||||
impl<T> FIRFilter<T>
|
||||
where
|
||||
T: Iterator<Item = Complex32>,
|
||||
impl FIRFilter
|
||||
{
|
||||
pub fn new(impulse_response: &[Complex32], input: T) -> Self {
|
||||
pub fn new(impulse_response: &[Complex32]) -> Self {
|
||||
FIRFilter {
|
||||
size: impulse_response.len(),
|
||||
impulse_response: impulse_response.iter().copied().collect(),
|
||||
//normalization: impulse_response.iter().map(|x| x.mag()).reduce(|acc, e| acc.max(e)).unwrap(),
|
||||
normalization: impulse_response.iter().copied().sum::<Complex32>().mag(), // DC normalization
|
||||
// TODO: Maybe we'd want other types of normalization (per frequency)
|
||||
taps: VecDeque::from(vec![Complex32::zero(); impulse_response.len()]),
|
||||
input,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<T> Iterator for FIRFilter<T>
|
||||
where
|
||||
T: Iterator<Item = Complex32>,
|
||||
{
|
||||
type Item = Complex32;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
pub fn next(&mut self, next: Complex32) -> Complex32 {
|
||||
let _ = self.taps.pop_front();
|
||||
|
||||
let sample = self.input.next();
|
||||
if let None = sample {
|
||||
self.taps.push_back(Complex32::zero());
|
||||
None
|
||||
} else {
|
||||
self.taps.push_back(sample.unwrap());
|
||||
Some(
|
||||
self.taps
|
||||
.iter()
|
||||
.zip(self.impulse_response.iter())
|
||||
.map(|(tap, coef)| *tap * *coef)
|
||||
.sum(),
|
||||
)
|
||||
}
|
||||
self.taps.push_back(next);
|
||||
self.taps
|
||||
.iter()
|
||||
.zip(self.impulse_response.iter())
|
||||
.map(|(tap, coef)| *tap * *coef)
|
||||
.sum::<Complex32>() / self.normalization
|
||||
}
|
||||
}
|
||||
|
||||
@ -1,8 +1,51 @@
|
||||
// Utilities for impulse response design
|
||||
|
||||
pub struct WindowIRDesigner {
|
||||
window: fn(f32) -> f32,
|
||||
use crate::complex::Complex32;
|
||||
|
||||
// Ideal requested transfer function
|
||||
transfer_function: Box<[Complex32]>,
|
||||
pub mod design
|
||||
{
|
||||
use crate::fft::FFT;
|
||||
use crate::windows::{self, Window};
|
||||
use crate::complex::Complex32;
|
||||
|
||||
///Designs a impulse response from a desired transfer function using windowing technique
|
||||
pub fn ir_from_transfer_function(transfer_function: &[Complex32], ir_length: usize, window: Window) -> Vec<Complex32>
|
||||
{
|
||||
let tf_len = transfer_function.len();
|
||||
let mut ifft = FFT::new_inv(tf_len);
|
||||
|
||||
// Compute ideal convolution kernel/impulse response
|
||||
ifft.execute(transfer_function);
|
||||
|
||||
// Shorten and window
|
||||
let mut ir = vec![];
|
||||
|
||||
for i in 0..ir_length
|
||||
{
|
||||
// Get value within ifft result (centering/trimming)
|
||||
let k = (tf_len - (ir_length / 2) + i) % tf_len;
|
||||
// Windowing
|
||||
ir.push(
|
||||
ifft.get_output()[k] * window(i as f32 / ir_length as f32) / tf_len as f32
|
||||
);
|
||||
}
|
||||
|
||||
ir
|
||||
}
|
||||
|
||||
pub fn frequency_response(impulse_response: &[Complex32]) -> Vec<Complex32>
|
||||
{
|
||||
let len = impulse_response.len();
|
||||
let mut fft = FFT::new(len, windows::rectangular);
|
||||
// Recenter impulse response
|
||||
let mut centered_ir = vec![];
|
||||
for i in 0..len
|
||||
{
|
||||
let k = (len / 2) + i;
|
||||
centered_ir.push(impulse_response[k % len]);
|
||||
}
|
||||
|
||||
fft.execute(¢ered_ir);
|
||||
Vec::from(fft.get_output())
|
||||
}
|
||||
}
|
||||
|
||||
61
src/iq.rs
61
src/iq.rs
@ -1,37 +1,50 @@
|
||||
use crate::{complex::Complex32, nco::Nco};
|
||||
use std::f32::consts::PI;
|
||||
|
||||
pub struct IQSampler<T>
|
||||
where
|
||||
T: Iterator<Item = f32>,
|
||||
use crate::{complex::Complex32, filtering::fir::FIRFilter, map, nco::Nco, windows};
|
||||
|
||||
pub struct IQSampler
|
||||
{
|
||||
passband: T,
|
||||
local_oscillator: Nco,
|
||||
low_pass_i: FIRFilter,
|
||||
low_pass_q: FIRFilter,
|
||||
}
|
||||
|
||||
impl<T> IQSampler<T>
|
||||
where
|
||||
T: Iterator<Item = f32>,
|
||||
impl IQSampler
|
||||
{
|
||||
fn new(passband: T, center_freq: f32) -> Self {
|
||||
pub fn new(center_freq: f32) -> Self {
|
||||
// Design a lowpass filter that cuts off at the center freq
|
||||
// Estimate FIR length :
|
||||
let fir_length = 50;
|
||||
|
||||
// Ideal transfer function :
|
||||
let mut transfer_function = vec![Complex32::zero(); fir_length];
|
||||
let bin_id = map(center_freq, 0., PI, 0., transfer_function.len() as f32 / 2.).floor() as usize;
|
||||
for i in 0..bin_id
|
||||
{
|
||||
transfer_function[i] = Complex32::new(1., 0.);
|
||||
transfer_function[fir_length - 1 - i] = Complex32::new(1., 0.);
|
||||
}
|
||||
|
||||
let ir = crate::filtering::impulse_response::design::ir_from_transfer_function(&transfer_function, fir_length, windows::blackmann);
|
||||
|
||||
IQSampler {
|
||||
passband,
|
||||
local_oscillator: Nco::new(center_freq),
|
||||
low_pass_i: FIRFilter::new(&ir),
|
||||
low_pass_q: FIRFilter::new(&ir)
|
||||
}
|
||||
}
|
||||
|
||||
fn new_from_lo(passband: T, local_oscillator: Nco) -> Self {
|
||||
IQSampler {
|
||||
passband,
|
||||
local_oscillator,
|
||||
}
|
||||
pub fn sample(&mut self, input_sample: f32) -> Complex32
|
||||
{
|
||||
let i_mixed = self.local_oscillator.cexp().re * input_sample;
|
||||
let q_mixed = self.local_oscillator.cexp().im * input_sample;
|
||||
self.local_oscillator.step();
|
||||
|
||||
// TODO: Could use one filter for both I and Q
|
||||
Complex32::new(
|
||||
self.low_pass_i.next(Complex32::new(i_mixed, 0.)).re,
|
||||
self.low_pass_q.next(Complex32::new(q_mixed, 0.)).re
|
||||
) * 2.
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
impl<T> Iterator for IQSampler<T>
|
||||
where
|
||||
T: Iterator<Item = f32>,
|
||||
{
|
||||
type Item = Complex32;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {}
|
||||
}
|
||||
|
||||
236
src/main.rs
236
src/main.rs
@ -3,6 +3,7 @@
|
||||
use std::{
|
||||
f32::consts::PI,
|
||||
fs::File,
|
||||
i16,
|
||||
io::{Read, Write},
|
||||
ops::{Add, Div, Mul, Sub},
|
||||
};
|
||||
@ -21,33 +22,22 @@ use complex::Complex;
|
||||
use complex::Complex32;
|
||||
use fft::DFTAlgorithm;
|
||||
use nco::Nco;
|
||||
use plotters::prelude::*;
|
||||
|
||||
use eframe::egui::{self, Color32, debug_text::print};
|
||||
use egui_plot::{self, Bar, BarChart, Legend, Line, LineStyle, Plot, PlotPoints};
|
||||
use plotters::style::Color;
|
||||
|
||||
use crate::{
|
||||
bfsk::BFSKDem,
|
||||
fft::{
|
||||
FFT, FFTDirection, create_fft,
|
||||
dft::NaiveDFT,
|
||||
mixed_radix::MixedRadixFFT,
|
||||
prime_factors,
|
||||
rader::{RaderFFT, compute_prime_primitive_root, exp_mod},
|
||||
rader2::{Rader2FFT, next_pow2},
|
||||
radix2::Radix2FFT,
|
||||
windows,
|
||||
fft::{FFT, dft::NaiveDFT},
|
||||
filtering::{
|
||||
fir::FIRFilter,
|
||||
impulse_response::design::{self, frequency_response, ir_from_transfer_function},
|
||||
},
|
||||
iq::IQSampler,
|
||||
units::frequency::{self, hz_to_rad_per_sample},
|
||||
};
|
||||
|
||||
struct QuickLCG(i32);
|
||||
impl QuickLCG {
|
||||
pub fn seed(val: i32) -> QuickLCG {
|
||||
QuickLCG(val % 10)
|
||||
}
|
||||
pub fn next(&mut self) -> i32 {
|
||||
self.0 = self.0.overflowing_mul(9321).0.overflowing_add(5672).0 % 10;
|
||||
self.0
|
||||
}
|
||||
}
|
||||
|
||||
// Utilities
|
||||
fn map<T>(input: T, in_min: T, in_max: T, out_min: T, out_max: T) -> T
|
||||
where
|
||||
@ -58,17 +48,185 @@ where
|
||||
|
||||
fn main() {
|
||||
modulate();
|
||||
//œtest();
|
||||
println!("Demodulating");
|
||||
//demodulate();
|
||||
let native_options = eframe::NativeOptions::default();
|
||||
let _ = eframe::run_native("Egui", native_options, Box::new(|cc| Ok(Box::new(EguiApp::new(cc)))));
|
||||
}
|
||||
|
||||
#[derive(Default)]
|
||||
struct EguiApp {
|
||||
samples: Vec<f32>,
|
||||
|
||||
iq: Vec<Complex32>,
|
||||
dem: Vec<f32>,
|
||||
}
|
||||
const BAUD_RATE: u32 = 1000;
|
||||
|
||||
impl EguiApp {
|
||||
fn new(cc: &eframe::CreationContext<'_>) -> Self {
|
||||
let mut reader = hound::WavReader::open("audio/modulated.wav").unwrap();
|
||||
let samples = reader.samples::<i16>();
|
||||
let input_test = samples
|
||||
.take(10_000)
|
||||
.map(|x| x.unwrap() as f32 / i16::MAX as f32)
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
// Modulation parameters
|
||||
let frequency = 1700.;
|
||||
let deviation = 500.;
|
||||
|
||||
// Data parameters
|
||||
let sample_rate = 48000;
|
||||
let baud_rate = BAUD_RATE;
|
||||
|
||||
let mut iq_sampler = IQSampler::new(hz_to_rad_per_sample(frequency, sample_rate as f32));
|
||||
let iq = input_test
|
||||
.iter()
|
||||
.map(|x| iq_sampler.sample(*x))
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
let mut dem = BFSKDem::new(
|
||||
sample_rate / baud_rate,
|
||||
hz_to_rad_per_sample(deviation, sample_rate as f32),
|
||||
);
|
||||
let mut demodulated = vec![];
|
||||
|
||||
for x in iq.chunks((sample_rate / baud_rate) as usize) {
|
||||
let samples = x
|
||||
.iter()
|
||||
.copied()
|
||||
.chain(std::iter::repeat(Complex32::zero()))
|
||||
.take((sample_rate / baud_rate) as usize)
|
||||
.collect::<Vec<_>>();
|
||||
demodulated.push(dem.demod(&samples));
|
||||
}
|
||||
|
||||
Self {
|
||||
samples: input_test.clone(),
|
||||
iq,
|
||||
dem: demodulated
|
||||
.iter()
|
||||
.map(|b| if *b { 1. } else { 0. })
|
||||
.collect(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl eframe::App for EguiApp {
|
||||
fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
|
||||
egui::CentralPanel::default().show(ctx, |ui| {
|
||||
ui.heading("Hello World!");
|
||||
Plot::new("Fourrier transform")
|
||||
.legend(Legend::default())
|
||||
.show(ui, |plot_ui| {
|
||||
plot_ui.line(
|
||||
Line::new(
|
||||
"Transfer function",
|
||||
self.samples
|
||||
.iter()
|
||||
.enumerate()
|
||||
.map(|(i, x)| [i as f64 / self.samples.len() as f64, *x as f64])
|
||||
.collect::<Vec<_>>(),
|
||||
)
|
||||
.width(2.),
|
||||
);
|
||||
|
||||
plot_ui.line(
|
||||
Line::new(
|
||||
"RE",
|
||||
self.iq
|
||||
.iter()
|
||||
.enumerate()
|
||||
.map(|(i, x)| [i as f64 / self.iq.len() as f64, x.re as f64])
|
||||
.collect::<Vec<_>>(),
|
||||
)
|
||||
.width(2.),
|
||||
);
|
||||
|
||||
plot_ui.line(
|
||||
Line::new(
|
||||
"IM",
|
||||
self.iq
|
||||
.iter()
|
||||
.enumerate()
|
||||
.map(|(i, x)| [i as f64 / self.iq.len() as f64, x.im as f64])
|
||||
.collect::<Vec<_>>(),
|
||||
)
|
||||
.width(2.),
|
||||
);
|
||||
|
||||
plot_ui.line(
|
||||
Line::new(
|
||||
"Bits",
|
||||
self.iq
|
||||
.iter()
|
||||
.enumerate()
|
||||
.map(|(i, x)| {
|
||||
[
|
||||
i as f64 / self.iq.len() as f64,
|
||||
self.dem[(self.dem.len() as f32 * i as f32
|
||||
/ self.iq.len() as f32)
|
||||
.floor()
|
||||
as usize]
|
||||
as f64,
|
||||
]
|
||||
})
|
||||
.collect::<Vec<_>>(),
|
||||
)
|
||||
.width(2.),
|
||||
);
|
||||
})
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
fn demodulate() {
|
||||
let mut reader = hound::WavReader::open("audio/modulated.wav").unwrap();
|
||||
let samples = reader.samples::<i16>();
|
||||
|
||||
// Modulation parameters
|
||||
let frequency = 1700.;
|
||||
let deviation = 500.;
|
||||
|
||||
// Data parameter
|
||||
let sample_rate = 48000;
|
||||
let baud_rate = BAUD_RATE;
|
||||
|
||||
let mut iq_sampler = IQSampler::new(hz_to_rad_per_sample(frequency, sample_rate as f32));
|
||||
let iq_samples = samples
|
||||
.map(|x| iq_sampler.sample(x.unwrap() as f32 / i16::MAX as f32))
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
let mut dem = BFSKDem::new(
|
||||
sample_rate / baud_rate,
|
||||
hz_to_rad_per_sample(deviation, sample_rate as f32),
|
||||
);
|
||||
let mut bits = vec![];
|
||||
|
||||
for x in iq_samples.chunks((sample_rate / baud_rate) as usize) {
|
||||
// Zero pad
|
||||
//let zero_padded = x.iter().copied().chain(std::iter::repeat(Complex32::zero())).take(sample_rate as usize / baud_rate as usize).collect::<Vec<_>>();
|
||||
//bits.push(dem.demod(&zero_padded));
|
||||
bits.push(dem.demod(x));
|
||||
}
|
||||
|
||||
assert!(bits.len() % 8 == 0);
|
||||
|
||||
let mut out_file = File::create("out.txt").unwrap();
|
||||
for x in bits.chunks(8) {
|
||||
out_file.write_all(&[!bits_to_byte(x)]).unwrap();
|
||||
}
|
||||
}
|
||||
|
||||
fn modulate() {
|
||||
// Modulation parameters
|
||||
let frequency = 2000.;
|
||||
let frequency = 1700.;
|
||||
let deviation = 500.;
|
||||
|
||||
// Data parameters
|
||||
let sample_rate = 44100;
|
||||
let baud_rate = 400;
|
||||
// Data parameter
|
||||
let sample_rate = 48000;
|
||||
let baud_rate = BAUD_RATE;
|
||||
|
||||
// File to modulate
|
||||
let f = File::open("s.txt").unwrap();
|
||||
@ -92,7 +250,7 @@ fn modulate() {
|
||||
sample_format: hound::SampleFormat::Int,
|
||||
};
|
||||
|
||||
let mut writer = hound::WavWriter::create("sine.wav", spec).unwrap();
|
||||
let mut writer = hound::WavWriter::create("audio/modulated.wav", spec).unwrap();
|
||||
for (s, up) in modulator.zip(lo) {
|
||||
let sample = (s * up).re; // Project to I coords
|
||||
let amplitude = i16::MAX as f32;
|
||||
@ -113,3 +271,27 @@ fn byte_to_bits(byte: u8) -> Vec<bool> {
|
||||
(byte >> 7) & 1 == 1,
|
||||
]
|
||||
}
|
||||
|
||||
/*
|
||||
fn bits_to_byte(bits: &[bool]) -> u8 {
|
||||
bits[7] as u8 |
|
||||
bits[6] as u8 >> 1 |
|
||||
bits[5] as u8 >> 2 |
|
||||
bits[4] as u8 >> 3 |
|
||||
bits[3] as u8 >> 4 |
|
||||
bits[2] as u8 >> 5 |
|
||||
bits[1] as u8 >> 6 |
|
||||
bits[0] as u8 >> 7
|
||||
}
|
||||
*/
|
||||
|
||||
fn bits_to_byte(bits: &[bool]) -> u8 {
|
||||
bits[0] as u8
|
||||
| (bits[1] as u8) << 1
|
||||
| (bits[2] as u8) << 2
|
||||
| (bits[3] as u8) << 3
|
||||
| (bits[4] as u8) << 4
|
||||
| (bits[5] as u8) << 5
|
||||
| (bits[6] as u8) << 6
|
||||
| (bits[7] as u8) << 7
|
||||
}
|
||||
|
||||
@ -1,3 +1,7 @@
|
||||
use std::f32::consts::PI;
|
||||
|
||||
pub type Window = fn(f32) -> f32;
|
||||
|
||||
pub fn rectangular(_: f32) -> f32 {
|
||||
1.
|
||||
}
|
||||
@ -5,3 +9,19 @@ pub fn rectangular(_: f32) -> f32 {
|
||||
pub fn bartlett(t: f32) -> f32 {
|
||||
if t < 0.5 { 2. * t } else { 2. - 2. * t }
|
||||
}
|
||||
|
||||
pub fn hann(t: f32) -> f32
|
||||
{
|
||||
0.5 - 0.5 * (2. * PI * t).cos()
|
||||
}
|
||||
|
||||
pub fn hamming(t: f32) -> f32
|
||||
{
|
||||
0.54 - 0.46 * (2. * PI * t).cos()
|
||||
}
|
||||
|
||||
pub fn blackmann(t: f32) -> f32
|
||||
{
|
||||
let x = 2. * PI * t;
|
||||
0.45 - 0.5 * x.cos() + 0.08 * (2. * x).cos()
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user