I'm gonna post a couple I've found and document why I think you can just use these instead of buying dedicated hardware. My postings here will all be taken thru an old 2 channel DAC I've got - not the latest by any means. This will not give you every signal imaginable but there are many.
Here's what seems like perfectly usable pink noise. The ten dB/decade slope is nice & tight all the way across.
Here's what seems like perfectly usable pink noise. The ten dB/decade slope is nice & tight all the way across.
Attachments
I remember a while back checking the 1khz test tone that's available on Spotify ("audio reference check" album IIRC), laptop to E30 into E1DA adc, and it was a mess. Almost unusable.
Stick with "REW" software for digital tone generation IMO.
Stick with "REW" software for digital tone generation IMO.
I don't see the point of this. Every device/OS I can think of has better ways of generating test signals.
REW is for speakers. The 2 files I posted are great for, say, working on an analog tape deck.
What I'm saying is, properly vetted, there's plenty of "SOTA but 25 years ago" test signals on there.
I use that pink noise file all the time. But vetting is the key as many of the YT files are inaccurate.
What I'm saying is, properly vetted, there's plenty of "SOTA but 25 years ago" test signals on there.
I use that pink noise file all the time. But vetting is the key as many of the YT files are inaccurate.
I've used youtube videos to see what my PC speakers "do" as specs aren't all that reliable.
Also found this
The same page links to a better version of the video due to youtube factors.
Also found this
I just yesterday acquired this free app using an old iPhone 6 (without a sim card) so I don't risk my late model iPhone connecting it to a test rig. Even the free version is loaded with features.
https://apps.apple.com/us/app/audio-function-generator/id768229610
https://apps.apple.com/us/app/audio-function-generator/id768229610
I do this sometimes, but can't do it for power tests, as I need a way stronger signal than line level to push a big amp to clipping.
But it saves me pulling out the signal generator when I'm just tracing a signal.
I find it amusing when YouTube asks me if I'd like to finish watching 2 hours of 1khz sine wave test signal.
But it saves me pulling out the signal generator when I'm just tracing a signal.
I find it amusing when YouTube asks me if I'd like to finish watching 2 hours of 1khz sine wave test signal.
Lol mine sure don't! Tinnitus sufferer here, some days music is hard to enjoy.
(Treat your ears better than I did kids! Too many live shows before getting wise about earplugs. Do you know how loud The Tubes were on the Completion Backwards tour in 1981?)
But back to the signals, any signal that spends a moment in any digital format will have some kind of high frequency stone wall baked in. It's not an attribute of where you got the file from. It's fundamental to digital sampling. (A big player like YouTube may enforce one standard here, I don't know.)
I think the only way around this attribute is to be in the same room with all-analog generation gear, and never "drop down to digital" if that isn't too blasphemous a phrase.
(Treat your ears better than I did kids! Too many live shows before getting wise about earplugs. Do you know how loud The Tubes were on the Completion Backwards tour in 1981?)
But back to the signals, any signal that spends a moment in any digital format will have some kind of high frequency stone wall baked in. It's not an attribute of where you got the file from. It's fundamental to digital sampling. (A big player like YouTube may enforce one standard here, I don't know.)
I think the only way around this attribute is to be in the same room with all-analog generation gear, and never "drop down to digital" if that isn't too blasphemous a phrase.
I certainly cant hear 15 KHz @ 73 yo, might be worse but not going to try, it might ruin the hobby
I remember a neighbour who was unable to point out a disconnected tweeter, he was some 50 yo back then.
For the brave:
I remember a neighbour who was unable to point out a disconnected tweeter, he was some 50 yo back then.
For the brave:
I tested my hearing for the first time in a long time today. Can't hear anything over 14.5kHz. That seemed kind of low to me, but I guess it's pretty typical for my age.
Countless myths surround YouTube audio, one of the biggest is about YouTube supporting 320Kpbs bitrate. Though the highest audio bitrate that YouTube streams is 256kbps, there are still many deceitful services that claim to support 320Kbps YouTube audio and even lossless quality. If you converted or saved audio from YouTube using such services, upon listening you are likely to discover the quality is not as high as promised. If you want to know the real bitrate of any YouTube audio, you can do it the following way.
Download it, without converting it, then:
1. Download and install Fakin’ the Funk app. https://fakinthefunk.net/en/2. Launch the application.
3. Open the folder containing YouTube audio tracks on your computer.
4. Drag the audio file onto the application window.
5. After the processing is finished, you will see an in-app notification about the verity of claimed bitrate.
6. To make sure the conclusion is correct, click the second button from the left within the app. The frequency spectrum of your audio track will open.
7. Inspect the frequency cutoffs on the spectrum. Use the following as a reference to determine the bitrate.
- Cutoff at 11 kHz = 64 kbps.
- Cutoff at 16 kHz = 128 kbps.
- Cutoff at 19 kHz = 192 kbps.
- Cutoff at 20 kHz = 320 kbps
Oh that's evil. It gives me flashbacks of working on crappy CRT televisions. I'm old and still hear that. Its also a reason I don't have speakers connected to computer sound cards because I can hear the computer noise which is almost as bad.