Information Technology Reference
In-Depth Information
To this end, Representation Information checking is performed in three steps:
1. Checking completeness of information: reconstruction of original process from
extracted Representation Information
2. Checking usefulness: construction of an equivalent process, from extracted
RepInfo , but executed from PureData (equivalent to a migration)
3. Authenticity: comparison of audio outputs, according to defined Authenticity
protocol
22.4.4.1 Checking Completeness of Information
The purpose of this checking is to check the completeness of Information
Representation. To this end, we apply a transformation using the Language Tool
(described above) to the original object (process). We then apply the reverse trans-
formation in order to obtain a new process. This process is supposed to be the same
as the original one. We can apply a bit-to-bit comparison method to the objects in
order to detect any loss of information illustrated in Fig.
22.7
.
22.4.4.2 Checking Usefulness of Information
The purpose of this check is to show that a new process, different from the orig-
inal one, but functional, can be reconstructed from the provided Representation
Information as illustrated in Fig.
22.7
.
In order to show this, an automatic translation tool is used (based on the
Language Tool already described), replacing the original Max/MSP environment
by the PureData environment.
It should be noticed that some manual adjustments have to be made in the cur-
rent version of the tools (due to incompleteness of Representation Information with
PureData).
22.4.4.3 Checking Authenticity
In order to check Authenticity, we apply an Authenticity protocol.
Here is a slightly simplified version of the AP:
•
At Ingest phase, 3-steps Authenticity Protocol:
-
Choose an input audio file (inputFile1)
-
Apply audio effect on it
-
Record output audio file (outputFile1)
•
At Migration phase, 3-steps Authenticity Protocol :
-
After migration, apply new audio effect on inputFile1
-
Record output audio file (outputFile2)
-
Compare outputFile1 and outputFile2 (by ear - audio engineer, or any other
method of comparison, for example comparing spectrograms), illustrated in
Fig.
22.8
