HOA v.s. PURE HOA

[Cyril Blanc]

Hello

I could not find in the manual an explanation

If the manual was in PDF it will be easy to find it

Thanks

Cyril

[Dietz]

The abbreviation "HOA" in a MIR 3D output format means that the selected preset uses Higher Order Ambisonics for decoding - opposed to the less detailed 1st Order decoding used in legacy MIR Pro. All of these presets use MIR's own built-in Ambisonics decoder.

"Raw Ambisonics" provides special modes that bypass MIR's highly optimised internal decoder and provide undecoded - i.e. "raw" - Ambisonics output for use with third-party decoders. This can be useful in some very advanced use cases (e.g. audio for 360° immersive installations) and has little use for MIR's typical range of applications.

[Cyril Blanc]

Hi Dietz

Thanks for your answer.

What is the difference between "HOA" and "Pure HOA"

I have just post a mail of problem with MIR, look to be Logic 11 related

Best

Cyril

[Dietz]

There is no difference between "HOA" and "Pure HAO", but I think you maybe meant to ask what the difference is between "Raw Ambisonics" and "Pure HOA" ...?

1. HOA is an abbreviation that stands for "Higher Order Ambisonics". HOA up to the 3rd order was introduced with the release of MIR 3D. Previous versions of MIR only offered 1st order Ambisonics - the most "primitive" variety of Ambisonics, if you want, but also the one that's most easy to handle and to understand.

2. The category "Raw Ambisonics" is used for a small selection of special Output Formats for MIR 3D that bypasses its internal Ambisonics Decoder (like mentioned before). MIR's output will be raw Ambisonics of the chosen order and has to be decoded externally for meaningful results. It's also indicated by an "empty", direction-less Ambisonics sphere in the position of MIR's Main Microphone:

3. For some of MIR's Output Format presets I used the term "pure HOA" to indicate that the decoding relies on a plain spherical, "coefficient-based" approach (i.e. on virtual loudspeakers instead of the more obvious virtual microphone capsules). Sometimes I used the term "straight HOA" synonymously.

4. For aesthetical reasons, some of my presets rely on mixtures of a "pure" HAO approach and added virtual capsules of lower order. This should always be reflected by the info text in the Output Format Editor, and of course by the graphical representation of the mic shown in MIR's Venue Map:

HTH!

PS: Please don't mix subjects within one forum thread. Keep your Logic issue separated. Ideally you will contact VSL's support and ask them to look at it. Thx!

[Cyril Blanc]

Hi Dietz

Thank you very much for your detail answer, but now I am completely confused.

I just want to make an Dolby Atmos 7.1.2 piece out of Logic 11

This piece will be sold on line on my own web site

I have set Logic 11 to Dolby Atmos

What setting should I put in MIR PRO 3D ?

Thanks in advance

Kind regards

Cyril

[Dietz]

A 7.1.2 output format would by the obvious choice, I guess.

[Cyril Blanc]

HOA or Pure HOA ; that is the question 😃

@Dietz said:

A 7.1.2 output format would by the obvious choice, I guess.

[Dietz]

Do you drink your coffee with milk or without? 😉 That's a matter of taste and context, not a hard technical decision.

[Cyril Blanc]

How do you want to set it when you don't know anything😂

@Dietz said:

Do you drink your coffee with milk or without? 😉 That's a matter of taste and context, not a hard technical decision.

[Andreas8420]

Go with HOA, in that case, @Cyril Blanc

[Cyril Blanc]

Thanks @Andreas8420

Returning on the LFE,

• can you confirm that MIR does not send anything on the LFE channel.
• I have to send instruments in Logic on the LFE channels and not to MIR
• I have to use MIR X on that channel
  
  
  Thanks again

@Andreas8420 said:

Go with HOA, in that case, @Cyril Blanc

[Dietz]

@Cyril-Blanc said:

Thanks @Andreas8420

Returning on the LFE,

• can you confirm that MIR does not send anything on the LFE channel.

• I have to send instruments in Logic on the LFE channels and not to MIR

• I have to use MIR X on that channel
  
  
  Thanks again

@Andreas8420 said:

Go with HOA, in that case, @Cyril Blanc

Why would you want to use MIRx for the LFE? 8-/

MIR is able to feed _something_ to the LFE on a technical level, but due to the simple fact that the IRs used for its rooms cover the range above 50 Hz and the absence of a steep low-pass filter to avoid HF content being routed into the LFE it shouldn't be used for this task, in 99 % of all cases.

Unless you don't head for exploding spaceships, the sound of earthquakes or legions of marching Orcs - please leave that LFE alone.

[Cyril Blanc]

I thought to use MIRx to put the same reverb than the venue.

You can listen to the 1st song I have put online on my site https://plessis-music.com/music or

LFE is going to be useful

@Dietz said:

@Cyril-Blanc said:

Thanks @Andreas8420

Returning on the LFE,

• can you confirm that MIR does not send anything on the LFE channel.

• I have to send instruments in Logic on the LFE channels and not to MIR

• I have to use MIR X on that channel
  
  
  Thanks again

@Andreas8420 said:

Go with HOA, in that case, @Cyril Blanc

Why would you want to use MIRx for the LFE? 8-/

MIR is able to feed _something_ to the LFE on a technical level, but due to the simple fact that the IRs used for its rooms cover the range above 50 Hz and the absence of a steep low-pass filter to avoid HF content being routed into the LFE it shouldn't be used for this task, in 99 % of all cases.

Unless you don't head for exploding spaceships, the sound of earthquakes or legions of marching Orcs - please leave that LFE alone.