Fostex PD204 owner manual Input signal selection, High-pass filter setting, Limiter setting

Chapter 5: Recording/Playback

Input signal selection

According to the analog audio signal fed to the [ANALOG IN] connector, set the LINE-MIC switch to "LINE" or "MIC". When you select "MIC", set the phantom power switch to "48V", "DM" or "T12" appropriately according to the microphone connected.

LINE		MIC	LINE		MIC	LINE		MIC	LINE		MIC
												INPUT SEL	LINE-MIC switches and
48V	DM T12		48V	DM T12		48V	DM T12		48V	DM T12
													phantom power switches
130		200	130		200	130		200	130		200
												(Hz)
50		300	50		300	50		300	50		300	HPF
-12	-6	OFF	-12	-6	OFF -12		-6	OFF -12		-6	OFF
												(dB/oct)

High-pass filter setting

The PD204 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

LINE		MIC	LINE		MIC	LINE		MIC	LINE		MIC
											INPUT SEL
48V	DM	T12	48V	DM	T12	48V	DM	T12	48V	DM	T12
130		200	130		200	130		200	130		200
											(Hz)
50		300	50		300	50		300	50		300
											HPF
-12	-6	OFF	-12	-6	OFF	-12	-6	OFF	-12	-6	OFF
											(dB/oct)

[HPF] controls

and switches

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 PD204 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 156 for details).

<Note>: When you use the limiter function, see also "Gain adjustment" on the page 81.

Location Recorder Model PD204 79