dspnel's Introduction

dspnel

A digital signal processing (DSP) programming language and tools to generate kernels in various target language.

Introduction

Because I am learning and experimenting with Software Defined Radio (SDR), I was lacking a domain-specific language (DSL) to easily experiment some ideas. Moreover because I am using several programming languages (esp. Rust, C++, Python), I do not want to repeat myself.

The goal is thus to have a DSL to:

express actual graphs and kernels,
visualize graphs as one may found them in text book,
apply some transformations and optimizations on graphs,
generate code in targetted languages.

Brainstorming

See also files in samples folder.

let a_vector = [2.0, 1.0];
let another_vector = [2.0;
                      1.0];
let a_matrix = [1.0, 2.0;
                3.0, 4.0];
let a_float32: f32 = 1.2;

kernel simplest_iir_low_pass_filter(
    in x:  <f32>,
    alpha: f32,
    out y: <f32>) {

    y = alpha * x + (1-alpha) * x';
}

kernel to_qpsk(
    in  symbols: <u2>,
    out iq:      <c32>) {
    
    let in_degrees = symbols * 360.0 / 4.0 + 45;
    let in_radians = in_degrees * pi / 180.0;
    iq = in_radians.cos() + 1j * in_radians.sin();
}

let k2 = to_qpsk() | simplest_iir_low_pass_filter(0.5);
let k2 = to_qpsk() ! simplest_iir_low_pass_filter(0.5);
let k2 = to_qpsk() : simplest_iir_low_pass_filter(0.5);
kernel k2 {
    let block1 = to_qpsk();
    let block2 = simplest_iir_low_pass_filter(0.5);
    block2.iq -> block1.x;
    // block2 -> block1
    // block1 <- block2
}