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1.
DESCRIPTION
Briiel
&
Kjaer
Copenhagen
Denmark
Monophonic
Gliding Frequency Record
20-20000
c/s
Type OR 2007
0
45 r.p.m.
D
Frequency Sweeps: Logarithmic 20 c/s to 20 kc/s in 15 seconds
Start Marking
(20
c/s point): Cease of the 1 kc/s signal preceeding each band
Recording Characteristic: IEC Standard No. 3 without treble emphasis
(constant velocity above 1 kc/s)
.
Recorded Velocity at 1 kc/s: 3.16 cm/s r.m .s.
Bands 1 to 10: lateral cut
fig.
1.4. Label of the QR 2007.
2
4
10
QR 2007
Bands 1 to 10
:
A B
20 cfs 20 kc fs
8/9 octave per
rev.
Fig. 1.5. Section of the QR 2007 showing the succession
'
of gliding frequency
bands preceded by a 1 kHz start and reference signal.
6
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