AMBDEC(1)

✨ AMBDEC(1) — General Commands Manual 🎀

okay bestie, let's talk about ambdec 🦋 the Ambisonic decoder for first and second order (and it can go further, we'll get there 💅).

✨ NAME ✨

ambdec — Ambisonic decoder for first and second order 🌈

💖 SYNOPSIS 💖

ambdec [options]
ambdec_cli  config_file

🌸 DESCRIPTION 🌸

okay so this page is gonna briefly document the ambdec and ambdec_cli commands, no cap 💅

AmbDec is an Ambisonics decoder for up to 36 speakers ✨. It works for both horizontal and full 3-D setups of first, second and third order 🔥. The decoding matrices are fully user-configurable, and AmbDec has some advanced features most decoders just don't have 👑:

Dual frequency band operation. Optimal Ambisonics reproduction needs a different decoder for low and high frequencies 🎀. This is mainly because human perception of sound direction uses different mechanisms at low and high frequencies, which is lowkey wild 🧚. The crossover filters in AmbDec are phase-aligned (the two outputs are exactly in phase at all frequencies) 💜. The combined response is equivalent to a first-order all-pass network, which is very probably inaudible 🫶.

Speaker distance compensation. If the speakers aren't all the same distance from the center of the listening area, you have to compensate with the right delays and gain corrections 🦋. Main character energy means getting this right 💅.

Near-field effect compensation. Ambisonics works by reconstructing the spherical harmonic components of a sound field at the center of the listening area, using all speakers to synthesize each of them 🌈. Every non-zero order component shows a near-field effect depending on the ratio wavelength=distance, and it gets stronger as the order goes up 😭. One example is the well known 'proximity effect' of directional microphones ('directional' is the same as 'using non-zero order components') 🎤. Unless you're in a very large installation where the speakers are far enough that the listening area isn't in the near field, this effect has to be compensated for to get a correct reconstruction of the sound field 💀.

🍓 OPTIONS 🍓

ambdec accepts the following command line options, bestie:

• -h — show a summary of the options 🙈
• -c FILE — load the configuration from FILE 🌸
• -p PATH — load presets from PATH ✨
• -V VOLUME — set the initial volume in dB 🔊

👑 AUTHOR 👑

ambdec was written by Fons Adriaensen <fons@kokkinizita.net> 🧚.

This manual page was written by Alessio Treglia <quadrispro@ubuntu.com>, for the Debian project (and may be used by others) 🫶.

And that's the whole page, iykyk 💖. Dated 2010/03/14, and it's an Ambdec 🦋 manual page with serious sparkle, periodt 💅✨.