Difference between revisions of "MTD2 class 6"

Revision as of 02:57, 10 October 2006

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.

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

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

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)

Ribbon Mic

The first type of mic was a Ribbn Microphone. Basiscally a light wieght ribbon that conducts electircty the is suspened in between two magnets. Older rinnon ics usally have a reduced frequency response.

Dynamic Mics

A light weight diaphram is sonnected to a coil that is suspened between a magnet.

Condenser Microphone

A very light weight diaphram is suspened in front of an electally charged back plate. The two plates basically act as an open air capacitor. As the air presure changed the distance between the plated the capacitance between the plates also changes. Condesor mics need Phantom Power to work.

Microphone Comparison

DAT Machine

DAT Machine Demo

Recording Demo with DAP1 DAT or HD-P2 compact flsh recorder

Scanners

[Image Scanner]

How Stuff Works Scanners

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

Read Chapter 2 in Sound Design for IM

Scan, color correct, and crop boards

Quiz 2 next week MTD2 Quiz 2 Review