madhav rao (ece) the university of alabama research professors – dr. john. c. lusth (cs) madhav...
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Madhav Rao March 30
Madhav Rao (ECE)
The University of Alabama
Research Professors – Dr. John. C. Lusth (CS)
RRA: An audio format for single-source music and lyrics
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Madhav Rao March 30
WAV Format RRA Format
Source: J .C. Lusth. Songlib: A library for music programming across the computer science curriculum. In American Society for engineering Education, 2007.
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RRA: Readily Readable audio
MP3 Format
Introduction to RRA format for audio
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Madhav Rao March 30
RRA format for audio
Source: J. C. Lusth, http://beastie.cs.ua.edu/songlib/
RRAUDIO%%<amplitude1><amplitude2><amplitude3>…………..…………..…………...
Header
Data
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RRAUDIO! Hohner Pocket Pal Harmonica ! D# ! recorded by Becky SmithsampleRate: 44100 bitsPerSample: 24 channels: 1 samples: 44100%%!amplitude begins001-2…………..…………..…………...
Defaultchannels: 1sampleRate: 44100samples: 0bitsPerSamples: 16
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Madhav Rao March 30 4/26
RRAUDIOchannels: 1 %%<amplitude0_channel0><amplitude1_channel0><amplitude2_channel0>…………..…………..…………...
RRAUDIOchannels: 2 %%<amplitude0_channel0><amplitude0_channel1><amplitude1_channel0><amplitude1_channel1>…………..…………..…………...
RRAUDIOchannels: 4%%<amplitude0_channel0><amplitude0_channel1><amplitude0_channel2><amplitude0_channel3><amplitude1_channel0><amplitude1_channel1><amplitude1_channel2><amplitude1_channel3>
RRA format for multiple channels: interleaved
Source: J. C. Lusth, http://beastie.cs.ua.edu/songlib/
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Madhav Rao March 30
arplay tool: native audio player for RRA files
5/26
Source: http://www.alsa-project.org/
arplay <filename>
arplay <filename1> <filename2> ….. loop
arplay <filename1> <filename2> ….. shuffle
arplay <filename1> <filename2>……
<rra-filters> <filename> | arplay
arplay <filename> scaling <XXX>
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Madhav Rao March 30
Drums track developed for crozier song
Drum Bass and Floor
static voiddrumBassFloor() { drum(Q,bassinst,1); drum(Q,floorinst,1); drum(I,bassinst,1); drum(I,bassinst,1); drum(Q,floorinst,1); }
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Madhav Rao March 30
Crash drum
static voidcrashDrum () { drum(I,crashinst,1); }
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Drums track developed for crozier song
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Madhav Rao March 30
Drums track developed for crozier song
intmain() { openOutput("drum.rra",0,0); intro(); verse1(); refrainStart(); rest(Q); verse2(); refrain(); bridge(); refrainA(); rest(W+W); ending(); closeOutput(); return 0; }
Crozier drum track
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Madhav Rao March 30
Karaoke system developed in RRA
backwards(1);addComment("!lGood people of this town...");forwards(1);for (i = 0; i < 2; ++i) drumBassFloor();
backwards(1);addComment("!lYou'd do well to gather around...");forwards(1);for (i = 0; i < 2; ++i) drumBassFloor();
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Madhav Rao March 30
Lyrics inserted in drum track of crozier song
000!lGood people of this town...000...............104210251053!lYou’d do well to gather around...103910401072
lyrics inserted in RRA
10/26
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Madhav Rao March 30
Lyrics displayed on screen while playing the drum track
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Madhav Rao March 30
arplay program flow
12/26
Lyrics displayed on screen
Samples passed to sound device
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Madhav Rao March 30
RRAUDIOSamples: <number-of-samples>%%<amplitude1><amplitude2><amplitude3>…………...!amplify 10…………..…………..…………...
RRA based filters: amplify
Amplified audio track
Original audio track
13/26
test.rra
rraamplify test.rra
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Madhav Rao March 30
RRAUDIOSamples: <number-of-samples>%%<amplitude1><amplitude2><amplitude3>…………...!drum snare pattern 8 Quarter length scaling 1.25…………..…………..…………...
RRA based processors: drum fillers
Audio track with added drum track on another channel
Original audio track: mono channel data
14/26
test.rra
rradrum test.rra
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Madhav Rao March 30
Pattern 1 Quarter length
Pattern 2 Quarter length
Pattern 4 Quarter length
Pattern 8 Quarter length
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Madhav Rao March 30
Pattern 8 Quarter length Pattern 8 Half length
Pattern 8 Whole length
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Madhav Rao March 30
RRAUDIOSamples: <number-of-samples>%%<amplitude1><amplitude2><amplitude3>…………...!compress 10…………..…………..…………...
RRA based filters: compression
17/26
test.rra
rracompress test.rra
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Madhav Rao March 30
RRAUDIOSamples: <number-of-samples>%%<amplitude1><amplitude2><amplitude3>…………...!crossover samples 11025 channels 0 1…………..…………..…………...
RRA based filters: crossover
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test.rra
rracrossover test.rra
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Madhav Rao March 30
RRA based multiple filters: crossover, compress, amplify
Original audio track Crossover
Crossover-amplified-compressed
Crossover- amplified
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Madhav Rao March 30
RRA project used in CS150 in Fall 2009
Students were asked to develop code to strip the initial silence.
The project involved: loops, file-operations such as reading and writing, and functions.
Stepwise refinement method was included to complete the project.
Initial silence
Original audio track given to students
Processed audio track
20/26
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Madhav Rao March 30
Other RRA projects to students in the future
RRA loop utility for first year programming students
21/26
Original audio track
Looping over 10 times
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Madhav Rao March 30
RRA add utility for first year programming students
22/26
Audio track 1 Audio track 2
Interleaved audio in a single track
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Madhav Rao March 30
RRA add utility for first year programming students
23/26
Audio track 1 Audio track 2
Interleaved audio in a single track Interleaved audio in a single track with a flair of longer audio
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Madhav Rao March 30
Conclusions
24/26
A readily readable audio format for single-source music and lyrics is demonstrated.
A readily readable audio format is used in the University of Alabama to reproduce drums track of a complete song.
A native RRA player is developed (arplay).
An RRA based student project was used in CS150 curriculum in Fall 2009.
Future student projects can be easily incorporated in introductory programming curriculum.
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Madhav Rao March 30
Future work
25/26
A web based RRA interface needs to be developed with an inbuilt RRA VIEWER similar to audacity tool.
A real time multimedia tools such as forwards, rewind, slow, fast needs to be developed.
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Madhav Rao March 30
Acknowledgements
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Thanks College of Engineering, UA.
Thanks Computer Science Department, UA.
Thanks Dr. Susan. L. Burkett (ECE), UA.