Fostex FR-2 owner manual Limiter, Selecting the sampling frequency/quantization bit length

FR-2Field Memory Recorder (Chapter 5: Recording/playback)

Limiter

By using the limiter, the signal level is prevented from exceeding a certain level. In result, the signal level fluctuation is suppressed. Therefore, the limiter is useful when recording a sound whose level is unknown. You can activate the limiter for both L and R channels by setting the [LIMITER] switch to "ON".

The FR-2 limiter uses the VCA (Voltage Controlled Amplifier) circuit. By default, the threshold is -2 dB under the 24-bit full-scale level (all bits: ON) and the com- pression ratio is 1:5. The limiter attack time is fixed to approximately 20 ms, while the release time is fixed to approximately 150 ms.

F (kHz)

48	88.2	96	PRE REC
		176.4
44.1			ON	OFF
22.05		192
			LIMITER
			ON	OFF

REWIND F.FWD

TRIM

-26 +4	-30 -60	-26 +4	-30 -60
ON	OFF	ON	OFF

HPF

(100Hz)

LR

PLAYSTOP

[LIMITER] switch

Selecting the sampling frequency/quantization bit length

You can select the desired sampling frequency ("FS " for short) and quantization bit length ("Bit" for short) for recording by using the [FS (kHz)] and [QUANTIZA- TION] switches on the top panel.

You can select the FS from among 22.05 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz,

176.4kHz and 192 kHz, while you can select the Bit between 16 and 24 bit. The current FS and Bit settings are shown on the Home screen. See the available com- bination of FS and Bit settings in the table below.

While receiving a digital signal, the FR-2 automatically detects the FS and Bit from the receiving digital signal, which takes priority over the [FS (kHz)] and [QUANTI- ZATION] switch settings.

	QUANTIZATION			TRACK MODE		L			R
						LINE	MIC	LINE		[QUANTIZATION] switch
	16BIT		24BIT	MONO	ST				MIC
							LINE
							/MIC
	FS(kHz)	88.2
	48		96	PRE REC			TRIM
			176.4
	44.1			ON	OFF					[FS (kHz)] switch
	22.05		192
				LIMITER		-26 +4	-30 -60	-26 +4	-30 -60
				ON	OFF	ON	OFF	ON	OFF
							HPF
							(100Hz)
FS (kHz)	BIT
	16bit			24bit
										You can see the current
22.05	Yes									FS and bit length.
44.1	Yes			Yes
48.0	Yes			Yes
88.2				Yes			<Note>: During recording (or input monitor), the FS
96				Yes
							and Bit follow the current switch settings.
176.4				Yes
							While stopped (or during playback), the FS and Bit
192				Yes
							recorded on the current file are shown.

<Note>: During recording, you cannot change FS and Bit setting.

If you change the [FS] select switch setting during recording, the switch setting becomes effective when recording stops.

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