Search found 3532 matches

by JR.
Thu Nov 26, 2020 3:23 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49478

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

Nice, you are already tens of dB better than I could even hear.... When dialing in the TS-1 I could just about hear distortion components down 50-60 dB. Which makes you twice as good (in dB terms, that is more like 1000x better in real linear world). I am impressed by how smart DSP can be applied to...
by JR.
Thu Nov 26, 2020 10:57 am
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49478

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

About digital synthesis, I found this: https://www.analog.com/en/technical-articles/an-almost-pure-dds-sine-wave-tone-generator.html Jumping at the conclusion. They claim: The –120 dBc harmonic distortion figure could be met with a careful design.... I have been synthesizing sine waves digitally fo...
by JR.
Thu Nov 26, 2020 9:42 am
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49478

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

I understand the objective is ultra low THD+N. How does this analog solution compares with digital synthesis. _Synthesis using a high performance sound card, focusrite, evaluation boards. _Synthesis re inventing all from scratch: High speed clock, Ram holding Sinus data, high resolution DAC, approp...
by JR.
Wed Nov 25, 2020 9:41 am
Forum: The Peabody Lounge
Topic: Guitar Center, Largest US Retailer Of Music Instruments, Files For Bankruptcy
Replies: 3
Views: 52

Re: Guitar Center, Largest US Retailer Of Music Instruments, Files For Bankruptcy

Isn't this their second or third bankruptcy? something like that, they have changed hands multiple times, I don't even recognize the current ownership. They were bought by Bain capital in 07 but now somebody else. The fact that they remain in business at all demonstrates how much extra liquidity is...
by JR.
Mon Nov 23, 2020 6:45 pm
Forum: Pro Audio Design
Topic: variable gain amplifier using analog optoisolators
Replies: 5
Views: 90

Re: variable gain amplifier using analog optoisolators

welcome to the hard part... Over the decades Dbx (now That corp) have published multiple papers about dynamics processing. Simply any gain control is a multiplier so the control voltage modulates (multiplies) the signal so the side chain modulations are audible... Too fast of a release time constant...
by JR.
Mon Nov 23, 2020 11:26 am
Forum: The Peabody Lounge
Topic: Gentle persuasion over time
Replies: 165
Views: 18325

Re: Gentle persuasion over time

Indeed, sharpening and right steel is a must. Steel affects how often you need to resharpen... I recall back in the 60s I had a pocket knife with a blade made from soft steel... it would get dull almost immediately after sharpening. I used my long handle axe yesterday to set in 70 pecan tree fertil...
by JR.
Mon Nov 23, 2020 8:53 am
Forum: The Peabody Lounge
Topic: Guitar Center, Largest US Retailer Of Music Instruments, Files For Bankruptcy
Replies: 3
Views: 52

Re: Guitar Center, Largest US Retailer Of Music Instruments, Files For Bankruptcy

again... probably to scrape off bricks and mortar baggage to go 100% web sales.

JR
by JR.
Sun Nov 22, 2020 10:53 pm
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 297
Views: 25243

Re: The Corona Virus Hoax of 2020

terkio wrote:
Sun Nov 22, 2020 7:09 pm
Where have I seen the story of one who had a positive test in a nostril and a negative in the other one ? :D
I think Elon Musk tested himself 4x and tied 2-2...

Many reports of repeat tests that disagree.

JR
by JR.
Sun Nov 22, 2020 1:59 pm
Forum: The Peabody Lounge
Topic: The Corona Virus Hoax of 2020
Replies: 297
Views: 25243

Re: The Corona Virus Hoax of 2020

what happens if you test both positive and negative? Do you quarantine 1/2 the time...? :lol:

JR
by JR.
Sat Nov 21, 2020 12:44 pm
Forum: Pro Audio Design
Topic: Super Low Distortion Ultra Pure Audio Oscillators Revisited
Replies: 62
Views: 49478

Re: Super Low Distortion Ultra Pure Audio Oscillators Revisited

There are probably ways to linearize an output buffer/driver with some local circuit tricks. IIRC there was some work done with audio power amps to linearize the output stages (like feed forward, whatever that means).

JR