LMH Team

This is the deliverables for LMH team for the CHORAS workshop at ASSA.

In assets you will find the following:

1. IR_DE.wav: Impulse response from DE
2. IR_DG.wav: Impulse response from DG
3. t30_DE.csv: T30 results from DE
4. DG_modes.csv: Frequencies of first 5 modes from DG
5. t30_DG_CHEATING.png: T30 results from DG (got from Dirac)
6. IR_DG_spectrum: Spectrum of the modes from DG
7. notes.txt for feedback and issues.

Members

• Lauri
• Maciej
• Hossein

Process

• We started with the shoebox and the default material settings.
• We tried DE with small charachteristich lenght ~0.1 and it was very slow.
• We then moved to custom materials for ceiling and floor.
• We also did cutom material for glass.
• We tried to consider desks and chairs as part of the floor properties.
• In the end, we had two types of glass, a cutom wall, a custom ceiling, and a custom floor.

Input settings

For reproducibility of your results we would like to know what inputs you used to complete your simulations.

Geometry

We did use Room2215_withAbs.obj from CHORAS repository.

Source position

• x: 9.5
• y: 4.5
• z: 1.7

Receiver position

• x: 2.5
• y: 3
• z: 1.4

Surfaces

We used the following custom materials:

• Double Glazzed Window, 0.15, 0.15, 0.05, 0.03, 0.03, 0.02, 0.02
• Plasticboard, 0.15, 0.15, 0.01, 0.06, 0.04, 0.04, 0.05
• 500hz custom wall, 0.06, 0.06, 0.11, 0.6, 0.57, 0.63, 0.64
• Micro Celing, 0.86, 0.86, 0.94, 0.65, 0.77, 0.76, 0.75
• Floor boards on joist floor, 0.15, 0.15, 0.2, 0.1, 0.1, 0.1, 0.1

Material properties:

• Surface [1]: single pane of glass > 4mm
• Surface [2]: single pane of glass > 4mm
• Surface [3]: double glazzed window
• Surface [4]: double glazzed window
• Surface [5]: single pane of glass > 4mm
• Surface [6]: single pane of glass > 4mm
• Surface [7]: double glazzed window
• Surface [8]: plasticboard
• Surface [9]: plasticboard
• Surface [10]: Acoustic ceiling (rockwool), 40 mm , 100 kg/m3, suspended 200 mm
• Surface [11]: Acoustic ceiling (rockwool), 40 mm , 100 kg/m3, suspended 200 mm
• Surface [12]: plasticboard
• Surface [13]: 500hz custom wall
• Surface [14]: 500hz custom wall
• Surface [15]: Micro Celing
• Surface [16]: Floor boards on joist floor
• Rest of the surfaces: material name

Settings

These are the DE and DG settings:

• DE

{
  "sim_len_type": "edt",
  "de_ir_length": 0.5,
  "de_c0": 343,
  "edt": 35,
  "de_lc": 1
}

• DG

{
  "dg_freq_upper_limit": 300,
  "dg_c0": 343,
  "dg_rho0": 1.213,
  "dg_ir_length": 0.5,
  "dg_poly_order": 4,
  "dg_ppw": 2,
  "dg_cfl": 1
}

3 proposals for improving CHORAS

For proposa, issues, and feedback, check our feedback note in notes.txt.