03-24-2020, 08:23 AM
|
|
Free Member
|
|
Join Date: Mar 2020
Posts: 9
Thanked 0 Times in 0 Posts
|
|
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!
|
Someday, 12:01 PM
|
|
Ads / Sponsors
|
|
Join Date: ∞
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
|
|
|
03-25-2020, 08:53 PM
|
|
Free Member
|
|
Join Date: Feb 2011
Location: Vancouver, Canada
Posts: 1,323
Thanked 332 Times in 276 Posts
|
|
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.
Audio_Thumping_Clip (Adobe Audition).PNG
Is it specific to this tape? Try a retail Hollywood movie release.
|
03-26-2020, 01:01 PM
|
|
Free Member
|
|
Join Date: Mar 2020
Posts: 9
Thanked 0 Times in 0 Posts
|
|
Quote:
Originally Posted by msgohan
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.
|
Thanks for taking a look. It's been on every tape I've tried.
|
03-27-2020, 03:45 PM
|
|
Free Member
|
|
Join Date: Feb 2014
Location: VA
Posts: 1,630
Thanked 353 Times in 309 Posts
|
|
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.
|
03-30-2020, 04:19 PM
|
|
Free Member
|
|
Join Date: Mar 2020
Posts: 9
Thanked 0 Times in 0 Posts
|
|
Quote:
Originally Posted by dpalomaki
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.
|
Sorry, I'm not sure I follow this. Can you break this down in layman's terms?
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?
Last edited by sublimesed; 03-30-2020 at 04:32 PM.
|
03-30-2020, 05:30 PM
|
|
Free Member
|
|
Join Date: Feb 2014
Location: VA
Posts: 1,630
Thanked 353 Times in 309 Posts
|
|
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.
|
03-30-2020, 06:19 PM
|
|
Site Staff | Video
|
|
Join Date: Dec 2002
Posts: 12,665
Thanked 2,325 Times in 1,983 Posts
|
|
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.
|
03-31-2020, 09:08 AM
|
|
Free Member
|
|
Join Date: Mar 2020
Posts: 9
Thanked 0 Times in 0 Posts
|
|
Quote:
Originally Posted by lordsmurf
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.
|
Thanks for all of the tips. I have the VCR and Computer connected to a CyberPower CP1000AVRLCD.
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.
|
04-08-2020, 11:41 AM
|
|
Free Member
|
|
Join Date: Mar 2020
Posts: 9
Thanked 0 Times in 0 Posts
|
|
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)
|
Similar Threads
|
Thread |
Thread Starter |
Forum |
Replies |
Last Post |
Requesting pointers for audio cleanup and noise removal
|
ehbowen |
Restore, Filter, Improve Quality |
0 |
01-15-2019 02:34 PM |
Audio issue/noise while capturing video from VHS?
|
mosolygosgyilkos |
Capture, Record, Transfer |
3 |
11-22-2018 02:39 PM |
Capture format coming from DV converter?
|
jeffpeck |
Capture, Record, Transfer |
4 |
01-26-2018 09:16 AM |
Problem with audio noise with VHS capture?
|
sggrissom |
Capture, Record, Transfer |
7 |
01-13-2016 08:07 PM |
Parasite sound (audio noise) during capture?
|
monks19 |
Capture, Record, Transfer |
4 |
05-08-2012 03:54 AM |
All times are GMT -5. The time now is 03:22 AM
|