Acoustics

Phase Relationships (1)

The Music Telegraph | Text 2019/01/02 [14:56]
Acoustics

Phase Relationships (1)

The Music Telegraph| 입력 : 2019/01/02 [14:56]

▲ © Electronics Notes

 


Phase

 

 

Phase (Ø):

- A plot of amplitude change over time 

 

 

▲ Phase

© The Music Telegraph




Ø Relationships:

- The resulting amplitude changes in wave combinations when a time relationship exists

 

 

 

 

*In phase relationship:

- We can cancel other sounds

 

 

 

 

There are 2 types of phase relationships:

1) Complete phase relationships

2) Partial phase relationships

 

 

 

1. Complete phase relationships:

 

- 0° and 180° phase relationships (there are only 2 complete phase relationships)

 

- There are the only relationships which can result in 'doubling' or 'total cancellation'

 

 

 

 

Common Terminology:

 

e.g. 0° = In phase

       150° = Out of phase

 

* 'In Phase' = Additive, Reinforcement (Increase in amplitude)

* 'Out of Phase' = Subtractive, Cancellation (Decrease in amplitude)

 

 

 

 

0° Phase relationship:

- In phase

- Totally additive  

 

▲ 0° Phase relationship (In phase, doubling)

© The Music Telegraph

 

 



 

 

 

 

 

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