User Manual

Multichannel Monitoring Tutorial Booklet (M2TB) rev. 3.5.2
Masataka Nakahara : SONA Corporation
©2005 YAMAHA Corporation, ©2005 SONA Corporation
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CH Media L C R LS RS BS LFE
DVD-V 85dBC 85dBC 85dBC
S=LS+RS=85dBC,
(LS=RS=82dBC)
- -
DVD-A
Film
-
3-1
Digital
broadcast
Prescribed by
administrative body
-
DVD-V 85dBC 85dBC 85dBC 85dBC 85dBC -+10dB band gain (89dBC, 20 - 120Hz)
Film 82dBC 82dBC -
DVD-A 85dBC 85dBC -±0dB band gain (79dBC, 20 - 120Hz)
Super
Audio CD
-
5.1
Digital
broadcast
-Prescribed by administrative body
6.1 DVD-V 85dBC 85dBC 85dBC 85dBC 85dBC 85dBC +10dB band gain (89dBC, 20 - 120Hz)
Film 82dBC 82dBC 82dBC
[Table 6] Playback level balances
[Fig. 49] Frequency characteristics of the filters of the sound level meter : A, C, F
[Fig. 50] is a table showing the levels of each 1/3-octave band for pink noise whose all-pass level is 85
dBC. If the all-pass level is 85 dBC, the 1/3-octave levels will be approximately 71 dB. In other words,
when C-weighted filtering is applied to the thirty-one bands (71 dB) and the bands are summed, the all-
pass level will be 85 dBC. Incidentally, all-pass level with F-weighted filtering will be 86 dB (71 dB + 10
log (31 band) = 86dB (F), 86dB (F) - 1dB (energy loss of a C-weighted filter) = 85 dBC). The sound
pressure level displayed by the sound level meter is this “all-pass level (85 dBC),” and an RTA (Real-
Time Analyzer) is required in order to determine the “band level (approximately 71 dB, 1/3 octave)” of
each frequency.
0
20
31.5
50 80
125 200
315 500 800
1.25k
2k
3.15k
5k
8k
12.5k
20k
10
-10
-20
-30
-40
F
1/3 octave band center frequency [Hz]
Gain [dB]
C
A