VHS Audio Noise Reduction / Rumble

[Vidd]

I am transferring 15-20 year old VHS tapes to my computer.

All the tapes have a faint constant static type hum. I was able to remove the static with a noise pattern and now have a clean file.

It sounds great until I play it on my home theater with subwoofer. It seems after the noise reduction there is now a rumble (like an increase in bass). The room will actually vibrate from the subwoofer. The original static hum file did not have this rumble (or it was much less).

How would i get rid of this rumble from the noise reduction?

Any help or suggestions will be greatly appreciated.


Adobe Audition:
Noise Reduction settings:
Snapshots: 4000
FFT Size: 4096
NR Level: 100%
Reduce by: 24 dB
Precision: 9
Smoothing: 1
Transition Width: 0 dB
Spectral Decay: 65%

[dLee]

It would help if you posted before / after samples somewhere so we know exactly what the problem is.

To my ears, hum and static are two different sounds. Hum might be from 60 cycle electric power and is usually removed by notching out the offending frequency using EQ. Static might be best removed by your NR pattern filter.

Run the unfiltered and filtered samples through a spectrum analyzer to see if you can isolate the frequencies involved.

The fact that the rumble popped out after filtering, makes your problem seem more like VHS HiFi sound distortion that occurs when tracking is poor.

It's all guesswork, until we can hear what you're hearing.

Are you really running Windows 3.1?

[victoriabears]

which vcr are you using?

Are you using a clean power source or one with lots of stuff plugged into it?

Have you a power bar with a filter in it, start at the front end rather than trying to cure a problem at the back end.

Have you tried/borrowed a different vcr, or switched to the mono track.

[Vidd]

It's static, I should not have put hum.
I can't post a sample yet, but imagine the analog TV "snow" sound in the background.
Pre-recorded tapes do not have static, so I wonder if even it could have been from the basic cable signal I recorded.

The sound is the worst on my JVC S-VHS. Best is on my old Panasonic stereo VHS (original recording deck for the tapes).

I looked at Lord Smurf's digitalfaq and his audio guide about "remove low rumble and harsh bass". The first file I tried seemed to help a bit.

Thanks for the suggestions. I'll pull unnecessary plugs from the power strip. I'll also give manual tracking a try instead of the automatic.

(The computers spec in my profile is my first computer. Not currently running Win 3.1 )

[victoriabears]

yes thats why knowing the vcr helps, the jvc s-vhs I have will not play hi fi audio well