On 7/21/2016 5:37 PM, Bob wrote:
On Thursday, July 21, 2016 at 3:54:24 PM UTC-4, JC wrote:
On 7/18/2016 12:10 AM, Black Iccy wrote:
On Sun, 17 Jul 2016 19:27:04 -0400, JC wrote:

Any of you audio guys have digital waveforms/ test cd's handy you can
share? Help!
TIA

Phil just clarified your requirements.
You can generate a waveform tone via Adobe Audition
(Ver 3 or earlier) assuming you can find a copy (Win).
Save as Wav or whatever.

Base Mod by Mod freq (rate)
3Khz +/- 'x'Hz @ rate 'y'
3000 30 4


Thanks to you and Phil for the info, proved to be very useful and Adobe
Audition seems to be the way to go.

Couple of problems arose.

I need 3 test signals:

JIS (3KHz) 1% @ 4Hz
CCIR (3KHz) 1% @ 4Hz (Same as JIS? Am I missing something here?)
DIN (3.15KHz) 1% @ 4Hz

These should, according to the limited service info I have, produce a 1%
reading on the meter for each relevant setting (JIS, CCIR,DIN)

JIS was giving me 0.5% so I read up on the Adobe Audition settings and I
guess i needed mod by 60 hz, (+/-30Hz). That gave me 1% display with JIS
but then doubles up on the CCIR/DIN giving 2%

JIS is supposedly an effective mean reading, CCIR/DIN are Peak, but I'm
not making sense of these readings, any ideas?

Amplitude of the input signal has no effect as long as its large enough
to register.

TIA.

Are you sure the modulation is a since wave (See Phils post above). This looks like a peak to average of a square wave pulse. I would try an actual analog generator with low distortion (in the 4 hz tone also) modulated and calibrated like Phil suggested. One way to check if I am correct is to listen to the tone and see if its frequency smoothly goes up and down or just snaps between high and low points. If it is hard to hear set the mod rate to 1 hz instead of 4.

...Bob

Yes, a possibility but I tried a square wave and I still get JIS giving
half the value of CCIR/DIN. A.Audition seems to generate a decent
waveform, I'm monitoring the signal on a scope so I know what I'm inputting.