Feedback Loop Isolators
FBI 100
Feedback Loop Isolator for Audio and Video
Features
•Selectively cuts VCR input path or output path to prevent A/V feedback loop through VCR
•Active circuitry provides high performance and
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•Contact closure control for simple, automated operation
•Balanced or unbalanced stereo audio input and output
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•External universal power supply included, part #
DESCRIPTION
The Extron FBI 100 Feedback Loop Isolator is designed to prevent potential feedback loops when a VCR is used for both recording and playback in an A/V system. As the VCR records signals through its A/V input, such as from a video camera and microphone, it outputs the same signals back into the system. The FBI 100 prevents the audio feedback loop, represented as a progressively loud tone that can occur if the VCR output signal is routed back into its A/V input via a switching system.
For example, feedback is likely to occur in a videoconference environment when mixed audio from the videoconference session is simultaneously recorded and introduced back into the system as an active source.
In record mode, the FBI 100 prevents feedback loops by directing the information to be recorded specifically to the VCR's A/V input while isolating the VCR output from the rest of the system. For other VCR modes, such as playback and stop, the VCR outputs to the A/V system as normal.
Video output
Number / Signal type. . . . . . . . . . . 2 composite video
Connectors.. . . . . . . . . . . . . . . . . . . . . . . 2 female BNC
Nominal level. . . . . . . . . . . . . . . . . . . . . 1
Minimum / Maximum levels. . . Analog: 0.3 V to 1.5
Impedance. . . . . . . . . . . . . . . . . . . . . . . . 75 ohms
Sync
Standards. . . . . . . . . . . . . . . . . . . . . . . . . NTSC 3.58, NTSC 4.43, PAL, SECAM
Audio
Gain |
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Overall (from “From Source” to |
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“To Destination”) | Unbalanced output: |
From “From Source” to |
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“To VCR In” | |
From “From VCR Out” to |
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“To Destination” | Unbalanced output: +6 dB; balanced output: +12 dB |
Frequency response | 20 Hz to 20 kHz, ±0.05 dB |
THD + Noise | 0.03% @ 1 kHz at nominal level |
S/N | >90 dB at maximum output (unweighted) |
Stereo channel separation | >80 dB @ 1 kHz, >60 dB @ 20 kHz |
CMRR | >75 dB @ 20 Hz to 20 kHz |
Audio input |
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Number / Signal type |
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“From Source” | 1 stereo balanced/unbalanced |
“From VCR Out” | 1 stereo, unbalanced |
Connectors |
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“From Source” | (1) 3.5 mm captive screw connector, 5 pole |
“From VCR Out” | 1 pair RCA |
Impedance | >12k ohms unbalanced, 24k ohms balanced, DC coupled |
Nominal level |
|
“From Source” | +4 dBu (1.23 Vrms) |
“From VCR Out” | |
Maximum level |
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“From Source” | +27 dBu, (balanced) at 1% THD+N |
“From VCR Out” | +11 dBV, (unbalanced) at 1% THD+N |
Input coupling | DC |
Audio output |
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Contact closure control provides a simple means of selecting the record or playback/stop mode of the FBI 100. Part of the VersaTools® line of small, economical, integrator friendly products, the FBI 100 is housed in a 1U, quarter rack width metal enclosure.
SPECIFICATIONS
Video
Gain.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unity
Bandwidth.. . . . . . . . . . . . . . . . . . . . . . . . 10 MHz
Video input
Number / Signal type. . . . . . . . . . . 2 composite video
Connectors.. . . . . . . . . . . . . . . . . . . . . . . 2 female BNC
Nominal level. . . . . . . . . . . . . . . . . . . . . 1
Minimum / Maximum levels. . . Analog: 0.3 V to 1.5
Impedance. . . . . . . . . . . . . . . . . . . . . . . . 75 ohms
Input coupling. . . . . . . . . . . . . . . . . . . . DC
Number / Signal type |
|
“To VCR In” | 1 stereo, unbalanced |
“To Destination” | 1 stereo, balanced/unbalanced |
Connectors |
|
“To VCR In” | 1 pair RCA |
“To Destination” | (1) 3.5 mm captive screw connector, 5 pole |
Impedance | >50k ohms unbalanced, 100k ohms balanced, DC coupled |
Maximum level |
|
“From Source” | +25 dBu, balanced at 1% THD+N |
“From VCR Out” | +11 dBV, unbalanced at 1% THD+N |
Control / remote — feedback isolator
CP Control Port. . . . . . . . . . . . . . . . . . . (1) 3.5 mm captive screw connector, 2 pole contact, controlled by an external control system.
General
External power supply | 100 VAC to 240 VAC, 50/60 Hz, external, to 12 VDC, 1 A (max), regulated |
Power input requirements | 12 VDC, 0.2 A |
Rack mount | Yes, with optional rack shelves (See optional accessories.) |
Enclosure type | Metal |
Enclosure dimensions | 1.7" H x 4.4" W x 3.0" D (1U high, quarter rack wide) |
| 4.3 cm H x 11.3 cm W x 7.6 cm D (Depth excludes connectors) |
Product / Shipping weight | 0.7 lbs (0.3 kg) / 3 lbs (2 kg) |
Model | VERSION DESCRIPTION |
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| PART # | |||
FBI 100 | VCR Feedback Loop Isolator | . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | . . . . . . . . . . . . . . . . . . . . |
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Optional Accessories | Model DESCRIPTION |
| page | PART # | |||
RSF 123 | 1U 3.5" Deep VersaTools® Rack Shelf Kit | . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | page 818 |
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RSB 123 | 1U 3.5" Deep Basic Rack Shelf | . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | page 818 |
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MBU 123 | VersaTools® Mini | . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | page 815 |
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PMK 100 | One VersaTools®, 1/4 Rack Width Mini Projector Mounting Kit | page 813 |
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+31.33.453.4040 / +800.3987.6673 | +971.4.2991800 | +65.6383.4400 / +800.7339.8766 | +86.21.3760.1568 / +400.883.1568 | +81.3.3511.7655 |
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+31.33.453.4050 FAX | +971.4.2991880 FAX | +65.6383.4664 FAX | +86.21.3760.1566 FAX | +81.3.3511.7656 FAX |