Acoustics

Dynamic Range (1)

The Music Telegraph | Text 2019/01/16 [13:51]
Acoustics

Dynamic Range (1)

The Music Telegraph| 입력 : 2019/01/16 [13:51]

▲ Dynamic Range

© The Music Telegraph

 



Dynamic Range

 

 

Dynamic range

- The ratio of the softest sound to the loudest sound 

- The usable space of an audio system/device

- It is defined by distortion (loud) and noise (soft)

 

*If a clipping point is +24 dBu (or MOL), then the above dynamic range is 24 +100 =124 dB (If noise floor = -100 dBu)

 

*ROL = +4 dB ==> Average electronic line level in the concert sound system is +4 dB (1.23 volts), corresponding to an average sound level of 110 dB SPL at the microphone

 

*Headroom shows the ability of the sound system to handle loud program peaks

 

 

 

Inherent system noise:

 

- In Analog system => 'Hiss' (random electron motion)

(e.g. Analog tape machine causes lots of friction => cause noise (hiss))

 

- In Digital system => 'Quantization error' (the difference between an input value and its quantized value)

 

 

 

[side trip]

 

- Echo tape (effect used on the voices of Elvis Presley)

 

- ‘Bohemian Rapsody’:

Freddie Mercury voice in high octave => used pitch shifter (e.g. Auto-tune)

 

- Pad effect:

Reasons why FM radio signal is louder than original CD is ‘pad effect’ (play same note at same time)

 

- If you want really “Heavy” bass sound, mix piano sound with the bass guitar sound together (play same notes as bass guitar)

 

 

 

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