Audio Thumping Noise Coming Through Capture
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I'll admit, I don't have prosumer VCR (yet). I'm trying to determine where this audio thumping is coming from before I start spending a ton of money.
I don't seem to hear it if I connect the VCR to the TV using RCA cables, however that may just be the speakers on the TV? I've also cleaned all connectors on the VCR with Isopropyl Alcohol. VCR Brand: Symphonic Model: SL2960 Output: RCA Tape Brand: Sony Model: T-120VF Capture Device Brand: Pinnacle Model: Dazzle DVC-100 v1.1 Input: RCA Software Name: VirtualDub Version: 1.9.11 Video Codec: Lagarith Lossless Audio Code: N/A Audio Quality: PCM: 48000Hz, stereo, 16-bit See Attached Video for the clip. Thanks in advance! |
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Hmm. If you look at the Spectral Frequency Display, at the bottom there are little spikes with a repeating period of about 0.1 sec. I don't know the cause.
Attachment 11509 Is it specific to this tape? Try a retail Hollywood movie release. |
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FWIW: That low level motor-boating sort of sound I hear reminds me a bit of a low grade feedback loop I recall hearing years ago. It was a form of a relaxation oscillator.
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Also, to add to this, I'm connected to a UPS however the outlet in this part of the house is not grounded. Could this be the feedback loop you are referring to? |
Be careful routing cables, long cables and parallel runs should be avoided as much as possible.
All devices should be connected to the same power strip. If using a camcorder as a player, try battery and then ac power to see if it makes a difference. Eliminate all connections/cables that are not required for your process. e.g., if capturing s-video, do not connect the composite video jacks, do not connect anything to the VCR inputs, and so on. Relaxation oscillations happen when a voltage somewhere in the system gradually increases silently, then reaches a point where it discharges creating the quick thump. The process repeats until resolved. |
Something else near the capture workflow is causing it. Maybe same room, same house/building, or even the local power grid.
Remember to put all devices on a UPS, not directly in the wall, not on some pathetic "surge protector". (All surge protectors are junk, regardless of price, promises/marketing, or how much you like it.) These are nice units: https://www.amazon.com/CyberPower-CP...language=en_US Beware of the cheapest units. Bigger units worth the cost, but mostly just gives extra battery life. |
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I guess I'm going to try to move the VCR, capture device and PC further away from each other. Thanks again. I'll report back. |
This seems to have done the trick! I moved the VCR, Capture card and PC away from each other and I don't hear it anymore.
Thanks! (CASE CLOSED) |
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