Record Monitoring.34 - Fostex PD-4 Owner's Manual

Fostex
PD-4 DIGITAL AUDIO RECORDER
Attenuation
To prevent the microphone amplifier from clipping, 20 dB of gain attenuation can be applied
to the input signal. Use the ATT(dB) switch (20) to select 0 (no attenuation) or 20 (20 dB of
attenuation). If the PEAK LED (25) for a charmel is constantly illuminating, you should
attenuate the input.
This function is only available when the LINE/MIC switch is set to MIC. Each input channel
can be switched independently.
Phantom power
The PD-4 can provide power to condenser-type microphones. Set the PHANTOM switch (21)
to the P48 setting to send 48V DC through the analog input connectors (CHI IN, CH2 IN,
and CHS IN) to the microphone.
This function is only available when the LINE/MIC switch is set to MIC. Each input charmel
can be switched independently.
Filter
The FILTER(Hz) control (22) is a continuously variable rotary control. It is only active when
the LINE/MIC switch is on the MIC setting. The cut-off frequency of the filter can be set from
20 to 300 Hz. It is a high-pass filter with a slope of -12 dB/octave.
This function is useful when you want to remove wind noise and rumble when recording
outdoors, or when you want to remove undesirable low-frequency noise while recording
voice or music indoors or outdoors.
Each input channel can be filtered independently.
Limiter
The limiter allows a more consistent signal level to be achieved when recording with
microphones. The limiter is applied to the input signal after the three input channels are mixed
to two charmels. It affects both the right and left channels.
The limiter circuit is powered on with the LIMITER switch (24). The INPUT switch must be
set to ANA (analog) and the LINE/MIC switch to MIC (microphone).
The limiter is a VCA (voltage controlled amplifier) circuit with the threshold set at -12 dB
from 16-bit full scale level (all bits on). A compression ratio of 1:3 is applied to signal levels
above the threshold. The limiter attack time is 20ms and the release time is 200ms.
Record monitoring
stereo headphones / internal speaker
Plug a set of stereo headphones into the PHONES jack (39) This is a standard 6mm (1/4")
diameter stereo jack. When you cormect a pair of stereo headphones to the jack, monitoring
through the headphones is automatically selected.
34
Recording