• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). Come here to have fun, be ready to be teased and not take online life too seriously. We now measure and review equipment for free! Click here for details.

Vu-meters

Newk Yuler

Member
Patreon Donor
Joined
Mar 5, 2019
Messages
74
Likes
38
#2
Nice work. As far as VU meters go I preferred well designed VFD meters in cassette decks shortly before they (the decks) began to seriously go away. With peak hold. I got way more satisfaction out of staring at those things than analog meters. Lines of LEDs weren't anywhere near as cool as VFD.
 
Joined
Jul 8, 2019
Messages
52
Likes
37
#3
the most interesting and hypnotic thing was the analog vumeter.
Have you ever tried stereoscopic viewing with your hypnotic VU-meters? Stereoscopic viewing is used to view, well eh..., stereo(scopic) images.

You can get stereoscopic viewers for that, but then you don’t need those. The only thing you have to do is to look cross-eyed at a pair of stereo images. So look with your right eye at the left image and, vice versa, with your left eye at the right image, simultaneously.

1566833968386.png

It takes some practice, but you will notice that suddenly your eyes “lock on”.

Have a look at
http://www.starosta.com/3dshowcase/ihelp.html
and
https://petermobbs.wordpress.com/20...yed-stereo-viewing-the-swivel-eyed-challenge/
for more explaining and some example images.

Anyway, if you look at VU-meters this way when playing music in stereo (!), you will see that the meter is moving in 3D, in and out of the plane of the meters themselves. Looks mesmerizing.
 

cjfrbw

Senior Member
Joined
Mar 5, 2018
Messages
327
Likes
290
#4
Does it flip the Orang Pi Zero over when it's done on one side?
 

Fledermaus

Member
Patreon Donor
Joined
Jan 19, 2019
Messages
44
Likes
36
Location
France
#5
You SBC/Python guys are never short of a - more or less - indispensable tweak... This one's quite nice !
 
Joined
Mar 11, 2019
Messages
11
Likes
9
Location
Portland, Oregon
#6
Only one comment, this has nothing to do with VU meters

VU meters are calibrated to respond in a system with predictable dynamics and at known levels.
While these meters may be fun and maybe even tell you something, they are not VU meters.

Try looking it up in Wikipedia.

Cheers
Alan
 
Joined
Mar 11, 2019
Messages
11
Likes
9
Location
Portland, Oregon
#7
I only referred to the use of the term VU, which has a very specific meaning, and this ain;t it.

and as you say, this is audio SCIENCE review, so I guess correctness in verbage IS important.

and it seems you still don't get it about how to measure or units, there is no such thing as 0db signal. And it also would have nothing to do with a VU meter even if it existed.

otherwise, looks like a fun project
 
Joined
Sep 8, 2019
Messages
34
Likes
12
Location
Vancouver
#9
I only referred to the use of the term VU, which has a very specific meaning, and this ain;t it.

and as you say, this is audio SCIENCE review, so I guess correctness in verbage IS important.

and it seems you still don't get it about how to measure or units, there is no such thing as 0db signal. And it also would have nothing to do with a VU meter even if it existed.

otherwise, looks like a fun project
First let me apologize for the rant but the improper use of the decbel is a bit of a pet peave, and its rampant in both professionals as well as amatuer, and it makes comunication difficult.

If your gonna be picky theres no such thing as a 0db level for anything, dbs are a ratio. so you can say A is x db different than B ( like S/N or headroom ) but you cant say that a signal level is A db. It has to be A dbu, or dbm, or dbfs, or dbVU or even dbspl. The letters after the db tell you what quantity and the reference level ( the level that is multiplyed by the db). So 0 VU is 1.3volts ( into a 600ohm load) or +4dbu. Unfortunately this dropping of the suffix is common place and confusing and the two different uses of db, a ratio as in 100db signal to noise, and a signal level as in -3 dbfs, dont help.
 

g29

Active Member
Joined
May 1, 2019
Messages
279
Likes
151
#10
Too bad the OP got run off. He shared a cool DIY project that others can no longer enjoy.
 

scott wurcer

Active Member
Audio Luminary
Technical Expert
Joined
Apr 24, 2019
Messages
299
Likes
528
#11
Too bad the OP got run off. He shared a cool DIY project that others can no longer enjoy.
I agree and have no idea what was behind some of the comments. VU meters have well defined ballistics and time constants and dBu or dBV have clear definitions. I assumed the VU meters in and old well designed piece of equipment were being re-purposed and there was no reason to believe they did not conform to the standards at the time they were made.
 

Similar threads

Top Bottom