Spherel

Anywhere around your head.

Binaural panner for headphones: places the input around the listener's head by azimuth, elevation and distance, with the time and level differences between the ears, the head's shadow, a pinna cue for height and softer highs from behind and far away.

◆ Paidorg.sournd.utility.spherel

Hear it

Every parameter plays here, rendered on our server. Pick a test sound or your own file, move the dials or press Randomise, and switch bypass to compare.

Details

Engine id: org.sournd.utility.spherel
Category: Utility
Type: Binaural, pan
Licence: £2.99 once, or in the subscription
Version: 1.0.0
Parameters: 5
Latency: none
Tail: 0.05 s
Sidechain input: no
Channels: mono or stereo

Parameters

The id is the C ABI parameter id and the JUCE parameter id (as a decimal string).

Id	Key	Name	Min	Max	Default	Unit	Taper
0	`azimuth_deg`	Azimuth	-180	180	0	deg	linear
1	`elevation_deg`	Elevation	-45	90	0	deg	linear
2	`distance_m`	Distance	0.3	20	1	m	log
3	`head_radius_cm`	Head radius	7	11	8.75	cm	linear
4	`output_db`	Output	-12	12	0	dB	linear

How it is made

Original sOURnd design blending general, published techniques: the spherical-head model (per-ear travel-time difference from the head radius and a first-order head-shadow filter whose high-frequency gain follows the angle to the ear), an elevation-dependent pinna notch, a rear shading shelf, inverse-distance gain and air absorption.

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CMake

cmake

juce_add_module(path/to/sournd_engine)
target_include_directories(MyPlugin PRIVATE path/to/include)
target_link_libraries(MyPlugin PRIVATE sournd_engine path/to/libsournd_cabi.a)

Three lines. Full steps: JUCE quick start.

C++ (JUCE)

cpp

#include <sournd_engine/sournd_engine.h>

sournd::SourndEngine engine { "org.sournd.utility.spherel" };
juce::AudioProcessorValueTreeState parameters { *this, nullptr, "Parameters",
    sournd::SourndEngineParameters::createLayout (engine) };
sournd::SourndEngineParameters bridge { engine, parameters };

// prepareToPlay
engine.prepare ({ sampleRate, (juce::uint32) maximumBlock, 2 });
bridge.prepare (sampleRate);
setLatencySamples ((int) engine.latency());

// processBlock
bridge.apply ((uint32_t) buffer.getNumSamples());
juce::dsp::AudioBlock<float> block { buffer };
engine.process (juce::dsp::ProcessContextReplacing<float> { block });

// get/setStateInformation: hold getCallbackLock() around saveState / loadState,
// so state work never overlaps processBlock (full example: /docs/juce/)

Plain C

sournd_engine *e = NULL;
if (sournd_engine_create("org.sournd.utility.spherel", &e) == SOURND_OK) {
    sournd_engine_prepare(e, 48000.0, 512);
    sournd_engine_set_param(e, 0, 0); /* Azimuth */
    sournd_engine_process(e, in, out, 2, frames);
    sournd_engine_destroy(e);
}

Ask your AI

Paste this into your coding assistant:

Prompt

Add the sournd engine org.sournd.utility.spherel to my JUCE plugin. Follow https://sournd.com/docs/juce/index.md
and the engine reference at https://sournd.com/engines/spherel/index.md. Expose every parameter through APVTS.