Archive

SDIFF

SDIFF - Spectral Description Interchange File Format

What is SDIFF?

The idea is to create a new standardized file format to promote :

1. the multiplatform interchange of spectral description,
   


2. reduce the considerable duplication of effort for everybody to support

SDIF: Sound Description Interchange Format

Effective musical application of the many sound analysis/synthesis tools
now available has been hampered by the absence of a common representation
for analyzed data. Although standard file formats abound for time-domain
audio samples, each institution has its own file formats for other kinds
of sound descriptions.

SDIF Utilities We'd Love People to Write

• viewers
  
• editors
  
• converters to/from other common formats
  
• sanity checkers
  
• Phase continuity checkers
  
• Time tag statistics for each stream: uniformity of time sampling, max,
  min, average inter-frame intervals, etc.
  
• Interpolators: add new frames to an SDIF file by interpolating between
  (or ex

• Using doxygen to produce self-documenting source code.
• Install doxygen http://www.stack.nl/~dimitri/doxygen/download.html#latestsrc. I had trouble with the Mac OS X version--the interface seems to need some work (9/2008), so I suggest installing from source. Download the source code and the, using the terminal
  
cd /path/to/doxygen
./configure
make
sudo make install

  With the most current development tools, the code should compile cleanly.

Goals of SDIF

SDIF was designed with multiple goals in mind. Sometimes these goals
have been somewhat at odds with each other and we have been forced to be
clear about what is most important about the SDIF effort.

Interchange Format

Work Based On Old Versions of SDIF

• The File Format for SMS data, based the original SDIF home page.
  

Narrative

History

This effort was suggested by Xavier Rodet of IRCAM.

Overview

This document explains some of the motivation and background behind various
design decisions that went into defining SDIF.

Why Isn't SDIF IFF Compatible?

In early versions of SDIF, we claimed compatibility with the IFF standard,
the par

Define a global t_symbol called ps_buffer:

t_symbol *ps_buffer;


Do this in the main function:

void main(void){
...
ps_buffer = gensym("buffer~");
...
}

This function should convert a buffer name into an actual buffer:

t_buffer* _sym_to_buffer(t_symbol* s) {
 t_buffer *b;

# Remove any existing drivers:

sudo rm -rf /System/Library/Extensions/sky2_multi.kext
sudo rm -rf /System/Library/Extensions/RboxAudioDriver.kext
sudo rm -rf /System/Library/Extensions/Meyer120AudioDriver.kext
sudo rm -rf /System/Library/Extensions/DodecAudioDriver.kext
sudo rm -rf /System/Library/Extensions/TouchpadAudioDriver.kext

Here are some basic instructions for setting up a "Telematic" (remote) rehearsal/performance using AULab and the AUNetSend/Receive Audio Unit plugins.

1. Get a copy of AULab: it comes with the Developer tools from Apple, but you may be able to download it separately. It should include the AUNet* plugins--you shouldn't have to download them separately.
   

Access to the following resources requires membership in the CNMAT-SHRC research group. The authentication details are the same as used to access the website.

# Subversion Repository for Experiment Code:

- Checkout URL: [https://cnmat.berkeley.edu/svn/repository/shrc|https://cnmat.berkeley.edu/svn/repository/shrc]

The programming boot for the BTE hearing aid was modified to support simultaneous programming and direct audio input.

[inline-center:1]
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A small hole is drilled into the side of the boot.

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A pair of wires carrying the audio input are soldered directly to the internal connectors.

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Binaural DAI + Reprogramming.

TASCAM US-122L audio interface
PreSonus headphone amplifier
Mac MINI
2Ghz Intel Core 2 Duo
OSX 10.5.5
1GB 667Mhz DDR2 SDRAM

...

Apparatus configuration information.

Theoretical and applied results relevant to apparatus design, program model, etc.

- Design of the filterbank
- How to make a new one

Digital "SPL" reference:

The full-scale sinusoid is considered 120 dB SPL.
SPL meters are not weighted (e.g. A, C, etc). (@todo)
Music files are normalized to 72 dB SPL, and about 30 seconds long, and extracted from the "loudest part" of the music selection.

Collected materials on the CNMAT-SHRC research collaboration.

Instructions:

- Put the maxlib- folder into the MaxMSP path
e.g. Cycling '74 directory), or add it to the path (Options > File Preferences)
*Note that very long paths may be problematic in MaxMSP's buggy file opener.
An error, e.g. "can't open" in the Max status window means bad things
- Open main patch, exp/ui/comp_interface_16b.

DSP settings:

- 44.1 khz