MTD2 class 6

In class

• Transducers/Microphones
• Connectors
• Audio Levels
• DAT Demo
• Scan Demo

Audio Levels

Good Level Audio Levels

• Mic level - The level (or voltage) of signal generated by a microphone. Typically around 2 millivolts. Compare this with the two normal line levels (1.228V:+4dBu and .316V:-10dBV)

• Phono Level - little larger than mic level also has equalization based on standardized RIAA curve. use phono input a line

• Line Level - . There is an international standard for the level of inputs; it is around -10dBV(.316V) for semi-pro equipment, and about +4dBu(1.228V) for "pro" equipment. Line level outputs can come from tape decks, CD players, tuners, DAT decks, effects, etc.

• Speaker level - higher voltages for speakers

Audio Level Links

• Rane Pro Audio Reference dB
• Interactive Design Tools: Utilities : VRMS / dBm / dBu / dBV calculator

Meters

Analog VU meter - nominal level 0dB

Digital Meter - nominal level -12dB - 16dB

Red line shows last Peak. Numbers at the top show loudest Peak.

Transducers

Transducer = a device that converts one type of energy to another. A microphone converts acoustic energy to electrical energy. A speaker converts electrical energy to acoustical energy. They are both transducers.

Microphones

good readin Audio Technica Guide to Microphones

Types of microphones

1. Dynamic
2. Condenser
3. Ribbon
4. piezo electric (contact Mic)

other (Stereo, binaural, PZM- pressure zone microphone http://www.crownaudio.com/mics.htm)

Microphone Comparison

Parameter	Dynamic	Condenser	Ribbon
Frequency Response	Good	Best	Worst
Dynamic Range	Good	Good	Worst
Durability	Best	Good	Worst

Audio connectors

• 1/8" (3.5mm) Connectors Jack Plug Connectors Tip ring sleeve mono stereo
• 1/4"(6.35mm) Connectors
• Banana Plugs
• Binding Posts Bayonet Neill-Concelman/British Naval Connector type of signal varies or BNC
• RCA-Type video left audio right audio
• XLR Microphone XLR

Bluffers guide to WIRES AND CONNECTORS

Scanners

[Image Scanner]

An image scanner is an imput device that uses a CCD to obtain an image.

Scan, color correct, and crop boards

Scan, color correct, and crop boards demo

• Scan borads into Photoshop/Gimp
• Use Photoshop/Gimpto correct color (we don't want color just rclean black and white)
• Use Photoshop/Gimpto crop frames to correct size and aspect ratio
• Save as a series of uncompressed images

InClass Articulate Cuts from storyborads what motivates each cut

• What visual changes are there in the scene?
• What audible changes are there?
• What is the time reference?

Homework

Scan, color correct, and crop boards