Lecture 28 Closing it Out
This Week Today Friday Student Survey (15 minutes) The comments will be very important for future development of this approach to physics teaching. Return Examination #3 Complete the electronic side of music COLLECTION OF PODS (End of Hour) Friday Any spill-over from Wednesday Complete Pod collection (Else $50.00 or no grade) Brief Review for Final It’s OVER!!
MONDAY Final Examination MONDAY, December 6th 7:00 AM to 9:50 AM Room 359 (here) GRADES SHOULD BE POSTED BY THURSDAY.
We were talking about….. Speakers
Different Speakers for Different Folks Subwoofer Woofer Mid Range Tweeter LOW
Frequency Ranges for different types of speakers.
The “People Process” Sound Production Microphone Amplifier Recorder Digitize A/D CD D/A Amplifier Speaker(s)
Remember The Guitar?
Or Similar Stringed Instruments?
Another Music Application
The Strings
causes a current to flow The current is the audio How? Field in and around the magnet changes and causes a current to flow in the wire. The current is the audio signal.
The “Package” A Combination Amplifier and Speaker The Instrument
Multiple Sources of Sound
2004 Synthesizer
1955 RCA
1970 Moog Synthesizer
In your home (PC)
The Music Signal - Real
Start with a stored “sample”
How does a real sound vary?
A Synthesized Note for an instrument Mix the two together A Synthesized Note for an instrument
MIDI The MIDI protocol allows electronic devices (usually synthesizers, but also computers, light show controllers, VCR’s, multi-track recorders, etc.) to interact and work in synchronization with other MIDI compatible devices. Using a master controller device such as a keyboard, one can play or trigger sounds from other electronic devices remotely.
The Computer Thingy We have a voltage signal. We want to “code” it into digits (0,1) We want to COMPRESS the string of bits into a shorter one. Lots of methods. Most Popular is MP3
Analog Digital
The CD Player
Side View
The Path
The Data
The “Thing”
And out comes MUSIC !