High-Pass Filter Setting; Limiter Setting - Fostex PD606 Owner's Manual

Chapter 5: Recording/Playback

High-pass filter setting

The PD606 is equipped with the high-pass filter circuit. The cutoff frequency can be adjusted
within the range between 50 Hz and 300 Hz, while the filter slope can be selected between
-6 dB/oct. and -12 dB/oct.
The filter is useful to eliminate the wind noise during location recording or unnecessary low
frequency noise when recording voice or sound. You can make filter setting for each channel
individually.

Limiter setting

By using the limiter when recording microphone sound, the signal level is prevented from
exceeding a certain level. In result, the signal level fluctuation is suppressed. By default, the
threshold of the PD606 limiter is set to -12 dB under the 24-bit full-scale level (all bits are
ON) and the compressed ratio is set to 1:5. The limiter attack time is fixed to 5 ms, while the
release time is fixed to 200 ms. You can set limiter parameters using the "Limiter parameter"
menu item in the "SYS SETUP" menu of the MENU mode (see page 159 for details).
When you use the limiter function, see also "Gain adjustment" on the next page.
<Note>:
To activate/deactivate the limiter function, press the [SHIFT] key, followed by the [READY]
key of the desired channel (from channels 1 through 6 and the stereo bus channels).
When the limiter function is active, the [LIM.] indicator of the corresponding input channel
is lit. When the limiter is actually working, the [LIM.] indicator flashes quickly.
CH1~CH6 [READY] key
ST BUS [READY] key
SHIFT
[LIM.] indicator of the
Stereo bus channels
80
Location Recorder Model PD606
LINE MIC LINE MIC LINE MIC LINE MIC LINE
48V DM T12 48V DM T12 48V DM T12 48V DM T12 48V DM
130 200 130 200 130 200 130 200 130
50 300 50 300 50 300 50 300 50
-12 -6 OFF -12 -6 OFF -12 -6 OFF -12 -6 OFF -12 -6
[LIM.] indicator of each
channel (1 through 6)
MIC LINE MIC
INPUT
SEL
T12 48V DM T12
200 130 200
(Hz)
[HPF] controls
300 50 300
HPF
OFF -12 -6 OFF and switches
(dB/oct)