Friday, 15 May 2009

Post 5: Doing the experiment 1 (part 1)

Since the suggested performance cannot be done for technical reason like, being in two different location, two pianos, two performers e.t.c I tried to simulate the experimental performance in my place using computers an other equipment.

In the suggested performance there are two locations, Athens and Birmingham, so I will call them location A and B. So one laptop is A and the other is B.

Technical issues and specifications about the laptops

Location A therefore Laptop A has the following hardware:

Laptop A

Model Name: MacBook Pro 15"
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz

Memory: 2 GB
Mac OS: 10.4.11
External devises for A:

Soundcard: Edirol UA-25 (2 in-2 out)
Speakers: Yamaha SH-50

Headphones: Roland RH-50

Midi Keyboard: Roland SH-201 Synthesizer
Microphone: AKG 1000s

Software
Ejamming Audio 2.0
Logic Pro 7.2.3

Location B has the following hardware:

Laptop B

Model Name: MacBook (white)
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz

Memory: 4 GB
Mac OS: 10.5.7

Software

Ejamming Audio 2.0

I have installed the Ejamming Audio 2.0 software in the two laptops A and B in order to establish audio communication through the network. Ejamming software allows high quality compressed audio signal between performers using peer-to-peer technology. The following will explain it better.

“First, the eJamming software decreases the file sizes sent over the network. To do this, the company's engineers developed their own compression and decompression algorithms that shrink the file size, yet still maintain an audio quality higher than MP3, a common compression scheme, says Glueckman.
Second, each musician is directly connected with the other musicians in a jam session, instead of being routed through a server. This peer-to-peer configuration "results in a lower latency by routing the audio stream directly to your jam mates rather than, on average, doubling that transport latency by directing the audio stream through a remote server," says Bill Redmann, chief technology officer of eJamming.”
From http://www.technologyreview.com/Infotech/18783/


In the experiment, hypothetically, latency can produce this effect if the milliseconds that are produces form the audio communication are added. The same musical material played from two different locations can shift the music further apart every time.


The above score is the from the Piano Phase by Steve Reich.

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