.. / Hz.Builtins / Hz.Scope

Overview

Hz.Scope is unique among Hz's built-in plugins. Its job is not to synthesize or filter audio, but rather to analyze it and to periodically plot its results to the Audio Monitor and depicted here:

Hz.Scope produces two analyses. At top you can see the Fourier Spectrum with log frequency along the x axis and signal amplitude (in dB) along the y axis. Below this is the Signal Snapshot which represents a couple of cycles of the audio signal amplitude.

This plot is updated multiple times per second and so it's everchanging. Use these plots to gain insight into audio qualities or anomalies in your soundscapes.

Usage

Hz.Scope is an opt-in capabiility because it consumes non-trivial compute resources. To use it, just wire a Hz.Scope into your audio graph. Its very presence in the graph is what triggers the analysis.

Here's the relevant javascript snippet from the Hz.Scope example.

let scene = await Ascene.BeginFiber(this);
let o1 = scene.NewAnode("Hz.Osc")
let gain = scene.NewAnode("Hz.Mix");
let scope = scene.NewAnode("Hz.Scope");
let dac = scene.GetDAC();
scene.Chain(o1, gain, dac, scope);
scene.VisualizeGraph("ascopeOsc.js");
await scene.Sync();

Here we chain Hz.Scope after the DAC but you can place the scope elsewhere in the audio graph to analyze the audio signal there.