Sound and Audio

Frequency & measurement of sound - 

DYNAMIC MIC

Frequency travels by vibrations creating a pitch, depending on how fast or slow the vibrations are, they travel through the air. Frequency can be man made or digitally created through computers. Each vibration is measured in hertz. The more vibrations per second, the higher the frequency, i.e, tightly stretched elastic bands being pinged would create a high pitch, same for if the object was held loosely or was thicker than the elastic band, it would create a low frequency because the vibrations are slower. The standard export frequency for CDs/DVDs etc. is 44.1 KH2 per second. Sound waves are the way in which the vibrations travels. They are measured through DB (Decibels) which measure the volume.

Microphone and their uses - 

CONDENSOR MIC

TYPES:

• Dynamic - cheaper microphone, cost affective, hardwearing.
• They are generally used for live performances e.g. vocalists.
• Uni-directional (pick up sound from only one direct source, cardioid - shaped like heart) 
• Used for dynamic as they pick up sounds a close proximity to the source.

• Condensor - costly, less hardwearing than dynamic.
• Used for studio recording e.g. voice overs/narrating.
• Condensor microphones are usually both Uni and Omni directional. 
• Omni- directional (pick up sound 360 degrees)