BSR EQ-3000 - Page 13

Pink noise test for tape recorder performance
Jusr as pink noise is used with the SPECTRUM ANA-
LYZER to measure the frequency response of a listening
room, it
can also show the frequency response ot a tape
recorder.
The curve shown on the display corresponds to the fre-
quency response obtained from the tape deck
at the rec-
Depress
to
ording level chosen for that channel.
record pink
noise onto the
tape deck.
@ Adjust the tape deck recording
level to obtain
a proper VU meter
reading. The frequency response
of a cassette deck is usually mea-
sured at
-20 dB VU to eliminate
high frequency saturation effects.
Record a few minutes of pink
noise on both channels.
METER
HOLD
SPECTRUM ANALYZER
METER
SENSE
ATT
DUBBiHG MONITOR
RIGHT
E O REC 1bw2-1 SOURCE TAPElrE2 SOURCE
@ Release the PINK NOISE button.
MONITOR Set to the position
SOURCE
which selects the
T~PE I.- tape deck output
and playback the
pink noise
(e.g.
!I ,).
I
METER
SEHSE
I
Adjust
roughly to
center the
indicators on
the
d~spiay.
About the pink noise
An approximate frequency spectrum of pink noise
The pink noise signal consists of equal parts
of each oc-
I0
tave of the audio spectrum, like a deeper torm of the
white noise you hear
betwen FM radio station or on unoc-
a
cupied TV channels: an airly rushing sound. White noise
10
exhibits a 3 dB increase per octave as the frequency is I
1 1 111 11
increased. 50 100 250 500 1000 2500 MOO 1000D
An approximate frequency spectrum of white noise