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by mediatechnology
Mon Feb 19, 2024 3:14 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

https://proaudiodesignforum.com/images/jpg/Unocomp_Sidechain_Schematic_040824.jpg I just changed the above circuit to make the cap multiplier op amp (connected to the bottom of Ct) to a conventional inverting amp with a 10K Rfb. Edit 4/4/24. If one were using a switch connected in a rheostat config...
by mediatechnology
Mon Feb 19, 2024 12:08 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

It's in the original schematic at the end of the 2u2 film cap. When Av is 0 it's at AC ground and Ceffective is 2.2. When Av is -9 Ceffective is 2.2 uF + 19.8 uF.

Edited sign of Av. Ct is "anti-bootstrapped."
by mediatechnology
Mon Feb 19, 2024 8:53 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

One thing I'm going to change is the gain control of the capacitance multiplier. The pot is too cramped at slow rate settings and most people would want stepped controls anyway. Switching input resistors on the inverting stage to use a 6 position rotary switch with 600, 480, 360, 240, 120 and 60 dB/...
by mediatechnology
Sun Feb 18, 2024 6:43 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

I did some tests comparing the Attack and Release signatures of some of the compressors that we have that are favorites for voice. Here's the info on these tests: The test tone was generated by an Audio Precision System One, and recorded to Pro Tools at 96kHz through a 192 interface. 0 crossing for...
by mediatechnology
Sat Feb 17, 2024 5:37 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

I recall you posting that in this thread from bruno2000 (RIP) but the schematic disappeared: https://proaudiodesignforum.com/forum/php/viewtopic.php?p=3096 My toneburst tests were a "0-60" pedal to the floor test. I decided to use bruno's test tone to compare it to his findings and built o...
by mediatechnology
Thu Feb 15, 2024 4:19 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

A comparison of conventional "True Power Summing" to "Quadrature Power Summing" with a variable timing capacitor. The test is 10 cycles of 50 Hz with about 10 dB of compression. The first sequence is conventional True Power Summing (TPS) with the decay rate swept from 60 dB/s to...
by mediatechnology
Tue Feb 13, 2024 4:31 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

I remember that drawing. The cap multiplier I'm using is a single op amp inverting stage Av = 0 to -9 connected to the normally-grounded end of the timing cap. At a gain of 0 the timing cap's value is 2.2µF making the total range 10:1 to synthesize a 22 µF. I just finished listening to a walking bas...
by mediatechnology
Tue Feb 13, 2024 11:30 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

On pure sustained tones at 100 Hz I can hear various degrees of distortion at almost every setting of the capacitance multiplier when QPS is switched out and don't hear any change in timbre at any setting when QPS is in. HD-3 is near the same residual level as the VCA's HD-2 with QPS. At 50 Hz HD-3 ...
by mediatechnology
Tue Feb 13, 2024 8:05 am
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

I just started doing listening tests late yesterday and so far I really like the variable capacitance multiplier. I need to put on the 'phones and do some critical listening but before I do I wanted to verify, with tone, the benefits of Quadrature Power Summing. A quick FFT with a 100 Hz tone shows ...
by mediatechnology
Mon Feb 12, 2024 3:01 pm
Forum: Pro Audio Design
Topic: A Quadrature Power-Summed Compressor Sidechain For "The Uno Compressor"
Replies: 60
Views: 31463

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

Doug what does NLC bring to the table for you that you don't get with RMS? Less distortion on low frequencies? I did some digging to find out how dBx and THAT settled on the typical 10 µF, 7.5 µA, 35 ms log-domain tau, 120 dB/s decay rate used in almost every app note and schematic since the beginni...