Audio Level Meters
The Music Telegraph| 입력 : 2019/03/21 [12:19]
Audio Level Meters
Level Meters
- A visual representation of the electrical strength of an audio signal
- For measurement of External Level Variation
1. VU Meter
- Volume Unit
- 0 vu = +4 dBm (dBu)
- An 'averaging' meter reads the average levels
- Like our hearing, indicates the average loudness
- Not the actual level of the signal (VU meter is strength meter)
2. Peak Meter
- Read absolute level (Not an average level)
- Track all transients
- Indicates the true electrical peak
- Must use for digital recording
- Most peak meters are L.E.D. (Light Emitting Diodes)
- Type of meter: individual lights, bar graph
3. PPM
- Peak Program Meter
- -12 = +4 dBm
- Fast Rise Ballistic
- Slow Fall off Ballistic
- Read both absolute & average level
4. Digital Meter
- Digital ‘0’ = MOL (Maximum Operating Level)
- Accepted ROL Level (Reference Operating Level) = -18
- Digital level gives more freedom than analog does in controlling
*Basically 2 ~ 4 are same things (except VU meter)
[side trip]
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▲ Range of analog & digital meter
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▲ Dynamic Range (*Refer to range of Headroom (0 vu ~ 18 vu; +4 dBu ~ +24 dBu, ROL ~ MOL))
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▲ Audio signal and noise waveform
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