Digital and Analogue Signals To begin my research i will looking into what acually a digital and analog signal is as i think this is key to the understand of glitches noise and interefernce. All information is converted into signals. Information e.g. sound, speech and pictures and con- verted into electrical signals before its transmitted. Then its sent long distances down cables or on fm waves. Information can also be sent down optical fibres by convert- ing it into visible light or infrared signals. The amplitude and frequency of analogue signals vary all the time like in soundwaves. Parts opf an analogue signal have any value in a range. Digital signals are coded pulses - they only have one of two values: on or off, 1 or 0. Signals have to be amplified. Both signals get weaker as they travel so they need to be amplified along their route. They can also pick up random disturbances called noise. Each times its amplified the ana- logue signal gets less and less like the orignial. The different frequencies in it weaken at different times, when the signal is amplified the difference and noise are amplified too. Alot more information can be sent as digital signals compared to ana- logue ( at any certain time). Many digital signals can be tramist- ted at once by a clever way of over lapping them on the same cable or wave. Noise While researching what noise acually is ive been pondering on the fact that when creating visuals for noise should each noise have its own colour or to put it even simple does noise have colour in general. I can only imagine that every one has there own perception on what colour a certain noise would be and if possible i would like to leave this down to the user. In my mind it would be between three colours red green and blue and two channels (with the idea being left and right ears) which one would be what ? a tricky desicion. For now i think ill keep my options open but im swaying towards the thought of noise now be- ing a merge of all three. Digital Noise When data is transmitted a certain amount of noise enters the signal. Noise is caused by several reasons: data transmitted wirelessly, such as by radio, may be recieved inaccuratelly sur- rfering interference from other wireless sources, or just picking up general background noise. Microphones also pick up the intended signal as well as background noise without discrimi- nating between signal and noise, so when audio is encoded digitally, it typically already includes noise. Care must be taken to avoid noise and distortion when connecting digital and ana- log systems, but more when using analog systems. Research Development I was thinking off problems with analogue and digital signals that could be sovled with a design solution, one of the prob- lems i thought of was that digital is that it can’t deal with short wave radio and a lot of old people and some outside the uk who listen to uk radio stations do so on short wave radios and these become redundant if there is a complete switch to digital. I also felt like i needed a straight defition of what noise acu- ally was and i found a good one from the epd.gov. hk website “Noise is unwanted sound” i liked this quote as i felt it was true in a sense but i was more drawn to the fact noise can be used in a many interested and not necersially “unwanted” ways. Now i feel i have a basic understanding of both signals i will broaded my research into how to visualize noise and interefence. Interference The definition of interference is “Something that hinders, ob- structs, or impedes” but that is a general term, in electronics it is more specifinicly “the inhibition or prevention of clear recep- tion of broadcast signals” “the distorted portion of a recieved signal”. For my project i am inter- ested in how interference can be seen as a visual composition. I look into how interference causers this and what images are sometimes displayed on tv’s or screens. You come across this sort of stuff almost everyday infact very often when i plug my laptop into a screen in- terefer- ence is caused by what i can only think its my phone makes the screen pixelate and jitter in a hypnotizing way. Im trying to encourage this and discover ways of emulating visuals using these idea’s. Ive started looking at basic classic analog video interference and distor- tion which is usually seen as a pixalted black and white screen fliker- ing. I tested this on a basic tv using an antenna to move the signal and the effects went from double vision on the screen to no signal at all. GDNM MATT ALLEN DIGITAL SIGNAL ANALOGUE SIGNAL
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Digital and Analogue Signals
To begin my research i will looking into what acually a digital and analog signal is as i think this is key to the understand of glitches noise and interefernce. All information is converted into signals. Information e.g. sound, speech and pictures and con-verted into electrical signals before its transmitted. Then its sent long distances down cables or on fm waves. Information can also be sent down optical fibres by convert- ing it into visible light or infrared signals.
The amplitude and frequency of analogue signals vary all the time like in soundwaves. Parts opf an analogue signal have any value in a range. Digital signals are coded pulses - they only have one of two values: on or off, 1 or 0. Signals have to be amplified. Both signals get weaker as they travel so they need to be amplified along their route. They can also pick up random disturbances called noise. Each times its amplified the ana-logue signal gets less and less like the orignial. The different frequencies in it weaken at different times, when the signal is amplified the difference and noise are amplified too. Alot more information can be sent as digital signals compared to ana-logue ( at any certain time). Many digital signals can be tramist-ted at once by a clever way of over lapping them on the same cable or wave.
Noise
While researching what noise acually is ive been pondering on the fact that when creating visuals for noise should each noise have its own colour or to put it even simple does noise have colour in general. I can only imagine that every one has there own perception on what colour a certain noise would be and if possible i would like to leave this down to the user. In my mind it would be between three colours red green and blue and two channels (with the idea being left and right ears) which one would be what ? a tricky desicion. For now i think ill keep my options open but im swaying towards the thought of noise now be- ing a merge of all three.
Digital Noise
When data is transmitted a certain amount of noise enters the signal. Noise is caused by several reasons: data transmitted wirelessly, such as by radio, may be recieved inaccuratelly sur-rfering interference from other wireless sources, or just picking up general background noise. Microphones also pick up the intended signal as well as background noise without discrimi-nating between signal and noise, so when audio is encoded digitally, it typically already includes noise. Care must be taken to avoid noise and distortion when connecting digital and ana-log systems, but more when using analog systems.
Research Development
I was thinking off problems with analogue and digital signals that could be sovled with a design solution, one of the prob-lems i thought of was that digital is that it can’t deal with short wave radio and a lot of old people and some outside the uk who listen to uk radio stations do so on short wave radios and these become redundant if there is a complete switch to digital. I also felt like i needed a straight defition of what noise acu-ally was and i found a good one from the epd.gov. hk website “Noise is unwanted sound” i liked this quote as i felt it was true in a sense but i was more drawn to the fact noise can be used in a many interested and not necersially “unwanted” ways. Now i feel i have a basic understanding of both signals i will broaded my research into how to visualize noise and interefence.
InterferenceThe definition of interference is “Something that hinders, ob-structs, or impedes” but that is a general term, in electronics it is more specifinicly “the inhibition or prevention of clear recep-tion of broadcast signals” “the distorted portion of a recieved signal”. For my project i am inter- ested in how interference can be seen as a visual composition. I look into how interference causers this and what images are sometimes displayed on tv’s or screens. You come across this sort of stuff almost everyday infact very often when i plug my laptop into a screen in- terefer-ence is caused by what i can only think its my phone makes the screen pixelate and jitter in a hypnotizing way. Im trying to encourage this and discover ways of emulating visuals using these idea’s.Ive started looking at basic classic analog video interference and distor- tion which is usually seen as a pixalted black and white screen fliker- ing. I tested this on a basic tv using an antenna to move the signal and the effects went from double vision on the screen to no signal at all.
GDNMMATT ALLEN
DIGITAL SIGNAL
ANALOGUE SIGNAL
Development
Now i feel is a good time to start to try develop my idea’s for my experiments as i am running out of time for the submission. I would really like to use proccessing as it is something i have not tried before and feel would be a good to try learn. After re-searching into this further i found that processing does not have the abiltiy to process audio on its own but i believe there are some add on features that could be used.
From here i thought i should record and collect my own “noise” so i made some field recordings over a space of three days capturing my daily activies. I then timestretched each record-ing by 800% and processed it using a series of filters that can create binural frequencys suplied from Paul Strech, from this i was left with an interested layered piece of music. From the time streching and warping it gave the recordings like a texturte to them.
Paul Sound Strech
I found i had to eq every sample as to some frequencies were clashing with each other and i only found this when playing on a big sound system, but by eq’ing each sample i was able to control which interference and noise was being recieved in Ableton.
Moving onto my experiments now i will concentrate on trying to cause glitches and interference on purpose but while refering to my inital idea for the brief “the digital switch over”
digital interference 1
digital interference 2
digital interference 3 with rgb colours seperated.
Above is an image of the recordings in ableton each on there own channel
Reffereing back to the brief and my inial idea of the digital switch over i have thought to process a BBC news video i have found on the digital switch over
This is the video i have decided to process in various ways, it is a BBC Look East programme on the didigtal switch over. For my first experiment i have tried to recreate interefence but within a digital program.
Now using the interference i have create i have layered with the bbc news video
clip of bbc news interference.
clip of bbc news interference 2.
clip of bbc news interference 6.
clip of bbc news interference 7.
For the sound of the video i ran i through two plugins i found called gleetchlab and glitch by dblue. These plugins are real-time audio manipulation systems that give you full conrol of editing the sound in crazy ways. I used alot of the ableton filters to get rid of bad fequency’s. I also used a heart rate flatline sample for the cutout in the animation.
clip of bbc news interference 3.
clip of bbc news interference 4.
clip of bbc news interference 5.
Experiment 3
For my third experiment i have created my own glitch art from messing with tv signals, pc moniters and plugins.This image was created from loosening the connections on my pc screen and pulling out various bits and putting them back in.
PC Screen Glitch
This image was created from using the v002 glitch plugin for the quartz composer, it emulates the screen glitching using quiktime to open up the webcam. It has a a flow chart which can change how the plugin works from changing the texture to the syncing.
Quartz Composer Screen Glitch
These images were created using datadada, it is an application that writes all the information stored on your harddrive to your video and soundcard creating an unstable video, the sounds i re-corded from it were quite increadible, i eq’d the wavform and will use it for my final bbc processing video along with these images in my final piece.
Link to recorded sound
http://soundcloud.com/matthewwest/sounds-from-monday-afternoon
These images were created using header_remix v1.0 it manipulates the image giving you the op-tion to change each header axis, it starts with you taking a picture of your self with a webcam and then change values to create glitches on the screen. I plan to use these images in my final compo-sition.
These images are taking from my artefact. The video contains images and gltich art that i created and developed throughout my project. The soundtrack was also created using processed sound sample and interference.
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