57 lines
1.9 KiB
JavaScript
57 lines
1.9 KiB
JavaScript
// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
|
|
//
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
import assert from "node:assert/strict";
|
|
import test from "node:test";
|
|
import vm from "node:vm";
|
|
import { build } from "esbuild";
|
|
|
|
async function loadEstimator() {
|
|
const result = await build({
|
|
entryPoints: [new URL("../src/features/radio/auto-bandwidth.ts", import.meta.url).pathname],
|
|
bundle: true,
|
|
format: "cjs",
|
|
platform: "browser",
|
|
target: "es2022",
|
|
write: false,
|
|
});
|
|
const module = { exports: {} };
|
|
vm.runInNewContext(result.outputFiles[0].text, {
|
|
module,
|
|
exports: module.exports,
|
|
Array,
|
|
ArrayBuffer,
|
|
Number,
|
|
Math,
|
|
});
|
|
return module.exports.estimateOccupiedBandwidth;
|
|
}
|
|
|
|
function wfmFrame(signalHalfWidthHz, signalDb = -70) {
|
|
const sampleRate = 400_000;
|
|
const bins = Array.from({ length: 1025 }, (_, index) => {
|
|
const offsetHz = (index / 1024 - 0.5) * sampleRate;
|
|
return Math.abs(offsetHz) <= signalHalfWidthHz ? signalDb : -100;
|
|
});
|
|
return { bins, center_hz: 100_000_000, sample_rate: sampleRate };
|
|
}
|
|
|
|
test("weak WFM falls back to the 60 kHz intelligibility floor", async () => {
|
|
const estimate = await loadEstimator();
|
|
const weak = wfmFrame(90_000, -97);
|
|
assert.equal(estimate(weak, 100_000_000, "WFM", [180_000, 60_000, 300_000, 5_000]), 60_000);
|
|
});
|
|
|
|
test("WFM ACI and CCI cap an otherwise wide occupied estimate", async () => {
|
|
const estimate = await loadEstimator();
|
|
const frame = wfmFrame(95_000);
|
|
const limits = [180_000, 60_000, 300_000, 5_000];
|
|
const clear = estimate(frame, 100_000_000, "WFM", limits);
|
|
const adjacent = estimate(frame, 100_000_000, "WFM", limits, { aci: 100 });
|
|
const cochannel = estimate(frame, 100_000_000, "WFM", limits, { cci: 100 });
|
|
assert.ok(clear > adjacent);
|
|
assert.equal(adjacent, 60_000);
|
|
assert.ok(cochannel >= 135_000 && cochannel < clear);
|
|
});
|