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by mediatechnology
Wed Jan 31, 2024 4:23 am
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 12034

Re: John Roberts' audio articles

Q = 0.009 with VR1 at 0Ω.
Q = 8.25E-6 at 25KΩ.

I've put inductors in Rg to rolloff RFI.
by mediatechnology
Tue Jan 30, 2024 4:19 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17111

Re: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

Interesting but is side chain signal rectification the significant audible concern in side chains? https://groupdiy.com/threads/that2180-vca-based-compressor-90deg-detector-filter.81970/ https://groupdiy.com/threads/some-ideas-for-compressor-side-chains.52305/#post-666719 I thought I recalled Jakob...
by mediatechnology
Tue Jan 30, 2024 11:14 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17111

Re: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

Detector ripple produces odd-order distortion which is very audible when it's down in the power portion of the waveform. The Waveulator has shown us you can murder the peaks symmetrically with clipping but not the power portion of the waveform which is far more "delicate." When I get it co...
by mediatechnology
Tue Jan 30, 2024 7:00 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17111

Re: A Quadrature Power-Summed Compressor Sidechain

The sidechain schematic is a work-in-progress. The prototype will use the audio path of a Waveulator and a Quadrature Summing Filter board. https://proaudiodesignforum.com/images/jpg/Unocomp_Sidechain_Schematic_022424.jpg (Schematic updated 2/24/24.) I'm using an old school dBx 303 type RMS detector...
by mediatechnology
Mon Jan 29, 2024 2:30 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17111

Re: A Quadrature Power Summed Compressor Sidechain

It might seem sin² + cos² is overly complex when a stereo detector is required. By following Blackmer two 90° Dome networks and four log detectors would be needed. Fortunately that is not the case due to the unique property of the 90° Dome filter to equally weight L+R and L-R inputs. By splitting th...
by mediatechnology
Mon Jan 29, 2024 2:12 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17111

Re: A Quadrature Power Summed Compressor Sidechain

Thanks John. I forget the oscillator manufacturer that uses sin/cos zero cross to sample the opposite. E.g. zero cross of sine drives a sample and hold which captures the peak of cosine and vice-versa. The beauty of this approach is that we already have the squared term in the log domain when the de...
by mediatechnology
Mon Jan 29, 2024 8:47 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 41
Views: 17111

A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"

A Quadrature Power-Summed Compressor Sidechain Inspired by Blackmer's figure 4 in his RMS detector patent I'm working on a stereo compressor sidechain that uses a sin/cos Dome filter along with "True" Power Summing. I call the sidechain topology "Quadrature Power Summation" due ...
by mediatechnology
Fri Jan 26, 2024 9:06 am
Forum: Document
Topic: Performance Limits In Contemporary Console Design (Roberts, 1980)
Replies: 0
Views: 3557

Performance Limits In Contemporary Console Design (Roberts, 1980)

"Performance Limits In Contemporary Console Design," John Roberts, Recording, April 1980.

https://proaudiodesignforum.com/images/ ... 980-04.pdf
by mediatechnology
Fri Jan 26, 2024 4:43 am
Forum: The Peabody Lounge
Topic: Ok, now they are just trolling us
Replies: 5
Views: 4054

Re: Ok, now they are just trolling us

The globalists who want to kill us really mean it.

This looks like the typical predictive programming psyop.

Those Russian nuclear ice-breakers are badass though.
by mediatechnology
Fri Jan 26, 2024 4:29 am
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 12034

Re: John Roberts' audio articles

The John Roberts' Popular Electronics Articles are here: viewtopic.php?t=1062

I have the Console Design Article which I will post. viewtopic.php?p=17621#p17621