Handbook for Sound Engineers

1004 Chapter 26

The DIN 45406 and the IEC 268-10 have an integra-
tion time of 10 ms and a decay time of 1.5 s for 20 dB
of fallback and 2.5 s for 40 dB of decay. The indicator
range is 50 dB to +5 dB. The scale marked for 100%
reading is 0 dB which is the reference level of +6 dBu
or 1.55 Vrms, Fig. 26-10A.
The RTW 1019GL analog peak program meter +
loudness meter + phase correlation meter is shown in
Fig. 26-10A. The 127 mm (5 inch) 201 element bar
graph display has a 1 dB per division scale from +5 dB
to 10 dB changing logarithmically to 50 dB. Roll-off
above 20 kHz is 12 dB/octave. The meter includes a
+20 dB gain increase and a peak memory/reset circuit.
The integration time is selectable between 1 ms and
10 ms. The balanced input is transformer isolated.
The meter panel also includes a three-color phase
correlation value display with memory. The correlator
indicates the phase correlation r, of stereo signals. If
both channels are in phase—e.g., a mono signal on both
channels—the reading is +1 r. With only one or no
signal at the input, the meter will read 0 r.

26.7.2 British Broadcast Standard

The British Broadcast Standard, BS 55428 Part 9, has
an integration time of 12 ms and a decay time of 2.8 s
for decay from 7 to 1. The indicator range of 1 s to 7 is
equivalent to a 12 dB to +12 dB. The scale mark for
100% reading is 6 and is referenced to +8 dBu or
1.95 Vrms.
Fig. 26-10B shows an analog RTW 1034GL British
standard scale IIa analog peak program meter + loud-
ness meter + phase correlation meter. The 127 mm
(5 inch) 201 element bar graph display measures from
12 dB to +12 dB. The meter includes a +40 dB gain
increase and a peak memory/reset circuit. The integra-
tion time is selectable between 1 ms for digital audio
and 10 ms for analog audio. The balanced input is trans-
former isolated. The meter panel also includes a three
color-phase correlation value display with memory.

26.7.3 Nordic N9 Standard

The Nordic Recommendation N9 has an integration
time of 5 ms, a decay time of 1.7 s for 20 dB, and 3.4 s
for 40 dB of decay. The indicator range is from 42 dB
to +12 dB. The scale mark for 100% reading is 0 dB and
is referenced to +6 dBu or 1.5 Vrms, Fig. 26-10C.
Fig. 26-10C shows an analog RTW 1039GL Nordic
Recommendation N9 analog peak program meter +
loudness meter + phase correlation meter. The 127 mm
(5 inch) 201 element bar graph display measures from

42 dB to +12 dB. The meter includes a +40 dB gain

increase and a peak memory/reset circuit. The integra-

tion time is selectable between 1 ms for digital audio and

5 ms for analog audio. The balanced input is transformer

isolated. The meter panel also includes a three-color

phase correlation value display with memory.

26.8 AES/EBU Digital Peak Meter

With the advent of digital equipment, new meter stan-

dards are being written to work with the AES/EBU

digital format. This requires being capable of sampling

32 kHz, 44.056 kHz, 44.1 kHz, 48 kHz, and 96 kHz

with an AES/EBU digital format.

The attack time is one sampling period and the decay

time is 1.5 s for a change from 0 dB to 20 dB. The

indicator range is from 0 dB to 60 dB.

The RTW 11529G digital peak program meter +

loudness meter + phase correlation meter, Fig. 26-11A,

has a 127 mm (5 inch) 201 element bargraph display. Its

sampling rates are from 27 kHz to 96 kHz and it

includes a dc filter and has indicators for 44.1 kHz,

48 kHz, and 96 kHz, emphasis, error, and overload. The

Figure 26-10. European VI standards. Courtesy RTW

GmbH & Co.KG, Cologne.

Stereo DIN 45406

peak program

meter plus

loudness meter

plus phase

correlation meter.

A. Nordic N9 stereo

peak program

meter plus

loudness meter

plus phase

correlation meter

British standard C.

stereo peak

program meter

plus loudness

meter plus phase

correlation meter.

B.