Facsimile technology and fidelity
All models of mass communication are based off the facsimile
process of copying. Fidelity is a way to describe how faithfully the copy represents the individual.
What is transduction?
The process of changing one form of energy to another, usually sound into a
series of digital samples or light into electric current.
What are examples of mechanical transduction? What are examples of electronic transduction?
Mechanical=Microphones and more traditional technology, Electronic=CD players, DVD players,
Laptops, and almost anything digital.
Signal to noise ratio
The amount of signal present compared to the amount of noise
Oscillation and the waveform
Oscilliation is a basic concept of audio and video signal processing, the
wave has frequency, which is the number of cycles over a time period and applies to pitch and is
measured in Hz, and amplitude, which is the height of the wave and applies to volume.
What are the five steps in signal processing? (signal generation , amplification and processing,
transmission, reception, storage and retrieval)
What are the three characteristics of electromagnetic energy? (radiant, constant velocity, wavelike motion)
Velocity of electromagnetic energy
The speed of light, or 186,000 miles per second
What is a cycle of a radio wave?
How to figure out cycles per second. Peak to peak, valley to valley, or
middle to middle.
What is frequency, what is frequency response?
How well a receiver reproduces a range of audio
frequencies is an example of this.
What does Hertz measure?
Frequency of a wave
What is pulse code modulation?
What are the differences between amplitude and frequency modulation?
Frequency modulation is also
referred to as CPS or cycles per second which lets you modulate how many waves are completed in a
period of time
Why is FM superior to AM in sound quality?
What is the function of a switcher?
It enables live editing. If there are multiple cameras they are all
routed through a switcher which someone can control to decide what view the audience gets.
What is the difference between Dynamic, Condenser and Ribbon microphones?
AKA moving coil microphones have sound waves that strike the diaphragm of the microphone and
move its coil, producing an electrical signal.
.A magnet produces a magnet field which surrounds the
coil, and motion of the coil within the field causes the current to flow. Condenser microphones’
diaphragm consists of a light flexible membrane that vibrates with sound pressure toward a fixed
back condenser plate. It is not as rugged as other microphones, and the diaphragm is close to but not
touching the backplate.