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... This program allows a user to create movies with sound and pictures to be displayed on a web page. ...
New technology has made it much easier for somebody to edit audio signals on a computer. ... Audio editing requires quite a lot of processing power and memory to be able to handle the cutting and pasting and changing of the signals. A five minute piece of uncompressed audio would take up around 50MB of hard drive space. ... Since most people have at least 128MB of RAM, entire audio files can be stored in memory.
The sound card of a computer system can convert analogue audio signals into digital bits. ... For an audio signal to be stored on the computer, the signal must be sampled. ... An audio CD is sampled at 44,100 samples per second with 16 bits used per sample. ... DVD Audio for example is sampled at 192000 samples per second. ... Audio techniques would be used to change audio signals from one form to another to give the illusion of recording in specific locations, interviewing over a telephone etc. ... The second is that as an audio project, the animation was deemed not as important as the sound created. ... To create the impression of many different people taking part in the interviews, audio editing techniques will be used to change aspects of the audio signal and therefore changing the person’s voice.
The Story
The news story that had been created for the movie was made fictional so that a wider range of audio effects could be used. ... The movie was split up into the following sections:
• Introduction screen
• Welcome Screen
• Introduction Music
• Headline
• Cat in tree
• Cat falls from Tree
• Interview with owner
• Cat run down by fire truck
• Telephone interview with fireman
• Goodbye Screen
• Ending Music
Recording the Audio
Several different recording devices were used in the capturing of the audio signals used in the movie. These were:
PC Microphone – Used for the recording of all speech in the movie
SKY digibox with audio output – Used for recording news introduction
Mini Disc Recorder – Used for recording ambient sounds outdoors
The PC microphone is connected to the microphone socket of the computer’s soundcard. ... This is how a mini disc can hold around the same length of audio as an audio CD even though it is much smaller. ... Cool edit was the program used for capturing the audio signal. ...
Audio Editing
The length of the audio files was not too important for the movie as most of the movie was built around the audio and not the other way around. ... Firstly, the hiss was removed from the audio file. ... A filter was used that removed all audio frequencies below a certain threshold. ... Next, the amplitude of the signal was increased for the first second of the audio file to create a fading in effect. The same occurred at the end of the audio file but a fade out was used instead. ...
The audio file was finally normalised. This causes the entire audio file to be amplified until the loudest part of the audio file reaches a maximum level. ...
The delay is the amount of time that passes before an audio signal is repeated. ... To create the effect that the fireman is on a telephone, the frequencies of the audio were changed to a frequency range similar to that of the telephone system. ... The mix paste option does not insert an audio clip into another audio piece like pasting text into a document. Instead, mix paste overlaps one audio clip with another so they are both played at exactly the same time. ...
Before Mix Paste
After Mix Paste
The Interviewer of the Cat Owner had the speed reduced so that the voice was deeper and the audio file lasted longer. ... To counter act this effect, the audio signal was dynamically compressed so as to bring all areas of the voice to a more constant amplification. ...
One word was repeated during the interview one time too many and was cut from the final audio file. ...
Macromedia Flash was used to loop a small audio file to play as background music. Flash has its own looping facility and was set to loop the audio file 999 times which is easily enough to last the entire movie. ...
Flash was used to compress the audio files into high bit rate mp3 files once the movie had been completed as flash is not designed to work with large audio file sizes so compressing them would make the movie smother and faster.
Approximate Word count = 3746
Approximate Pages = 15
(250 words per page double spaced)
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