"SUB-HORMONIZER"

Clinton had one in his Whoremonica

lol.

Did that in 1979....

...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Looks to me like in the Mitsubishi IC they're using an external low pass filter and internal "frequency detector" to isolate the fundamental, then a flip flop to generate an octave down, envelope follower and VCA so the subharmonic tracks the input volume of the original signal, filter into a sine, and then sum with the original signal.

It doesn't seem like it would be difficult to emulate with discretes. I'm a little unclear as to how they're doing the fundamental detection in analog...I have a reference here somewhere called "Musical Applications of Microprocessors" that was written in the early 1980s and has a bunch of analog stuff in it as well - it goes into analog techniques for monophonic frequency detection a bit IIRC.

The schematic for your subharmonic synthesizer seems to be chopped up over several pages in that PDF and it's a little difficult to tell what's going on unfortunately.

My filtering is Elliptic such that dividing by two gives no spurious responses. Like the Mitsubishi chip I use envelope following, but I use a "tilt" gain stage to control the boost.

Really sounds great... original intent was boom-box applications for bars... that was my system at the Bobby McGee's on I17 in the early '80's, but it really sounds great with classical music as well... and Sousa... I still feel like I'm marching down the football field ;-)

Lot of parts but very straightforward function-wise.

Print it out and tape together. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Nah, our Monica played the mouth organ.

Cheers

--
Syd

There are probably systems where that effect sounds good - there are good reasons when mixing and mastering music to aggressively cut all the frequencies below about 40 Hz. The human ear has a lot of difficulty distinguishing pitches both at the very low end and very high end, and many of the sound systems that music will be played on can't reproduce frequencies that low anyway. They just eat up a lot of energy in the mix.

Getting the bass drum and the bass guitar/whatever bass instrument to sit well in popular music can take some careful work in mixing as they both impinge on each other's frequency domain...usually making broad boosts and narrow cuts in the EQ that are in opposition to each other helps. Often the bass is run through a dynamic range compressor, and sidechaning the bass drum into that compressor to duck when the kick hits can help glue things together.

In pop music everything that is not the rhythm section usually has their bass frequencies aggressively removed with high-pass filters.

I'm not into bar "music" >:-} ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Now includes a D-sized merged schematic... not real swift readability, these scans date back to the very first scanner I ever owned ;-) ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Thanks. What are the blocks of quad op-amps with an inverting amp in the feedback loop?

Cauer/Elliptic... State Variable style, but the additional loop adds a complex zero.

Somewhere around here I still have the paper derivations of those filters ;-) ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Ha! I bet she also had a go on the rusty trombone as well!

I remembered the filters incorrectly... I was thinking of some filters with zeroes that I designed for modems... back in the 1200 Baud days ;-)

With frequency detection done Foster-Seeley style using active filter techniques... see patent 4,472,816 FSK Discriminator on the Home Page of my website.

The boom-box filters are skewed band-pass type.

I have now added a merged schematic and the filter response to...

...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

On Wed, 22 Jul 2015 10:58:56 -0700, Jim Thompson Gave us:

Is this "SUB-HORMONIZER" something the Navy has?

Hehehehe...

"121 men go down and 60 couples and one very lonely guy comes back up..."

I am sure you wasn't the lonely one!

Jamie

On Wed, 22 Jul 2015 18:43:40 -0400, M Philbrook Gave us:

I am the one that would shove a splintery, old, dirty, wooden, NYPD broomstick handle up your ass till it comes out your mouth, punk.

Then I would perch what was left of you out in the desert ala "Planet of the Apes".

You are so predictable..

I picture you as a window licker on the short bus, sunshine...

You may even like to lick broom stick handles, used ones, too!

Jamie

Datasheet almost reads like it was written in China.. "..setting a constant of external filter", and "controlled by an externals source".

Given that it's a Mitsubishi product, I'd be more likely to guess Japan.

I hear they made some decent aircraft back in the day.