function calculateSNL() {
var signalInput = document.getElementById('signalPower');
var noiseInput = document.getElementById('noisePower');
var unitInput = document.getElementById('powerUnit');
var resultBox = document.getElementById('resultDisplay');
var resultValue = document.getElementById('snlResult');
var qualityText = document.getElementById('snlQuality');
var errorBox = document.getElementById('errorDisplay');
// Reset display
errorBox.style.display = 'none';
resultBox.style.display = 'none';
var s = parseFloat(signalInput.value);
var n = parseFloat(noiseInput.value);
var mode = unitInput.value;
// Validation
if (isNaN(s) || isNaN(n)) {
errorBox.innerHTML = "Please enter valid numeric values for both Signal and Noise power.";
errorBox.style.display = 'block';
return;
}
if (n <= 0) {
errorBox.innerHTML = "Noise power must be greater than zero to calculate a valid ratio.";
errorBox.style.display = 'block';
return;
}
if (s 40) {
quality = "Excellent signal integrity (Very low noise)";
} else if (snl > 25) {
quality = "Good signal quality (Acceptable for most data/audio)";
} else if (snl > 10) {
quality = "Fair signal (Potential data loss or static)";
} else {
quality = "Poor signal (High noise interference)";
}
// Display Result
resultValue.innerHTML = snl.toFixed(2) + " dB";
qualityText.innerHTML = quality;
resultBox.style.display = 'block';
}
About the SNL Rate (Signal-to-Noise Level)
The SNL Rate Calculator (often referred to interchangeably as SNR or Signal-to-Noise Ratio) is a fundamental tool used in electrical engineering, telecommunications, and audio acoustics. It measures the clarity of a signal by comparing the level of the desired signal to the level of background noise.
What is SNL?
The Signal Noise Level (SNL) represents the ratio of the power of a meaningful signal (like a radio broadcast or a WiFi data stream) to the power of the background noise (static or interference) that accompanies it. A higher SNL indicates a clearer signal, while a lower SNL indicates that the signal is being "drowned out" by noise.
The Formula
The calculation depends on whether you are measuring Power (Watts) or Amplitude (Volts/Current). The result is almost always expressed in decibels (dB).
Power (Watts): SNLdB = 10 × log10(Psignal / Pnoise)