Our Conversation With Bob Orban, Part 4

Orban’s first audio processor for FM broadcasting was launched 50 years ago. To mark the anniversary, the company is sponsoring a series of interviews of Bob Orban in conversation with Radio World Editor in Chief Paul McLane. (You can read the series from the beginning here.)
Last time Bob discussed the genesis of the Optimod-FM 8100A. Here is Part 4, which includes the acquisition of the company by AKG Acoustics and the introduction of the first DSP-based Orban FM audio processor, the Optimod-FM 8200.
Paul McLane: We ended on a cliffhanger last time, with the company about to be sold. What brought that about?
Bob Orban: My partner John Delantoni was ill and couldn’t put his full energy into managing it anymore. We had grown the company very nicely, so we looked around and AKG was the willing buyer. We did two months of grueling negotiations but the deal got done in 1989.
It completely changed the managerial structure and opened up opportunities for new growth.
McLane: AKG was based in Europe. At least watching from the outside, the Orban acquisition felt like a big shift for them, how did you fit into their thinking?
Orban: They were heavily into pro audio, and they felt that Orban would be a good fit for expanding into the broadcast market, which they saw as a first cousin to what they were already doing.
McLane: Were you entirely out of ownership at that point?
Orban: I was. I’d continue to be the chief engineer. My employment contract was one of the criteria for completing the deal.
McLane: So you kept your hand in, yet you were answering to a boss after having run the place on your own initiative. And there’s the whole creative side of your work. Was it a shock to the system?
Orban: As much as you might expect. We’d had product managers before the acquisition and it got a bit more serious with AKG, but I was still driving the technical innovation.
This was about the time we started developing the 8200, and we’d hired our first DSP engineer, Paul Neyrinck.
Motorola had come out with its 56000 series DSP chips, which were 24-bit, fixed-point with double precision arithmetic, and they were good enough for high-quality audio. The stars aligned in terms of making the first DSP-based Optimod practical.
McLane: Why did digital signal processing mark such an important shift?
Orban: It’s a completely different way of processing audio. At the simplest level, you could model analog audio processors. But you could also do stuff you could never do in analog.
One of the big challenges of building complicated analog processors like the 9000 or the 9100 was that they had hundreds of parts with varying tolerances.
We used sensitivity analysis and other formalisms to choose appropriate tolerances for the components; but the boxes were time-consuming to test. You really had to go into the details, measuring many things, to detect anomalies due to parts that were out of tolerance.
DSP is software, and once you write the software, every box sounds identical. You don’t have to worry about component tolerances anymore.
It also gives you the opportunity to make processing that’s more complicated than anything you could do in analog without having to worry about manufacturability.
McLane: What were the tradeoffs, if any?
Orban: We faced the aliasing problem, like anybody doing nonlinear processing in digital.
When you do clipping, for example, you produce harmonics, and if their frequencies are more than half the sample rate, they fold around and eventually end up back in the audio band, where they can cause a new unpleasant distortion that wasn’t present in the analog domain.
In the 8200 we approached this by oversampling four times so that our clippers were internally sampled at 128 kilohertz. We had set up a listening test, comparing the base sample rate — which was 32 in the 8200 — with 64 and with 128. There was a big audible difference going from 32 to 64, and a much smaller audible difference going from 64 to 128.
We figured that 128 was a good choice, so the 8200 was based on that.
Later, when we got competition from Omnia and Frank Foti started beating us up over aliasing, I revisited that and worked out some mathematical formalisms for anti-aliasing, which I patented and which would be introduced in the 8400.
The other difference was that digital filters naturally don’t have the same frequency response as their closest analog counterparts.
There are standard transforms you can use if you, say, have a low-pass filter or a filter doing FM preemphasis. For the low-pass filters, you often get a very reasonable result — it’s not identical to the analog, it might roll off more steeply, but it still gets the job done.
The problem was FM preemphasis. None of the common closed-form transforms got us close enough to make it satisfactory.
About this time I decided that I was going to teach myself DSP. I bought some textbooks and studied them. The advantage of having solid university engineering training from Princeton and Stanford is that you get a very good mathematical background, making it possible to understand the textbooks.
In school they said, “We’re not going to teach you much specific technology because it will be obsolete in 10 years. But if you know the mathematics and the physics, it will last you throughout your career.” And indeed that proved to be the case.
McLane: So you taught yourself.
Orban: I set an informal thesis for myself. I decided to write a program. Its original intent was to solve the preemphasis problem, but we’ve used it literally hundreds of times on other things.
It does what’s known as a minimax error approximation to analog filter frequency responses. It minimizes the maximum error between the digital frequency response and the frequency response of the original analog filter, and exploits several mathematical principles originally created by two Russian mathematicians: Professors Chebychev and (later) Remez, as well as more recent developments by the late Prof. Jiri Vlach at the University of Waterloo.
McLane: Was a lot of the work at the time about emulating analog equivalents?
Orban: The 8200 was modeling a sort of amalgam of the 8100, the XT2 and the Gregg Labs processor. We’d hired Greg Ogonowski as a consultant shortly after the AKG acquisition, and he was heavily involved in the development of the 8200. Gregg has been one of my best friends for 50 years now.
He’s one reason the 8200 has a five-band and not a six-band compressor like the XT2 — the five bands were based on the Gregg Labs processor.
McLane: So you’ve got the 8200 on the bench. How are you field-testing it? Were you asking customers to run beta versions?
Orban: At this point we felt we knew what we were doing in FM processing. We knew what was successful with the XT2 and the 8100, so most of our testing was internal.
We did not want to announce the product prematurely because we didn’t want to cannibalize our analog sales. John Delantoni picked up that technique from IBM. When IBM announced a new mainframe, they were ready to deliver it.
McLane: As you brought the 8200 to market in 1991, what was the differentiator? I don’t imagine people were going to buy it just because it had DSP in it.
Orban: First of all, it offered presets for the first time. It had a number of factory presets, and you could modify them and save your own. It relieved a lot of the need for stations to have a processing expert in house and automated a lot of that functionality. It also offered the ability to daypart the processing.
Another improvement was the big Less/More knob, which was intended to simplify operation. Instead of having to know exactly what you were doing to make the processor louder or quieter, you’re given a one-knob adjustment for basic control.
In short DSP was friendlier for users and needed fewer technical resources. Also, being digitally based, it opened up the opportunity to do PC remote.
McLane: Now we’re getting into interesting new options from the world of PCs and stuff.
Orban: It took us a while to complete the 8200’s PC remote software. We initially hired a consultant who didn’t give us a very good product so we eventually had to do this in-house.
Even before the 8200, we’d done a digitally controlled analog parametric equalizer and the digitally controlled analog mic processor. For control we were using a small microprocessor, the Zilog Z80, which was programmed in assembly language. The 8200 was programmed 100% in assembly language, both the control and the DSP.
McLane: Looking back, it must now seem pretty rudimentary, how you were putting everything together.
Orban: You had to work with the computing power that you had, and make sure the user experience was smooth.
The advantage of assembler is it’s as fast as it gets, at least at that time, so it could make the most of those old, slow processors. These days, with advanced optimizing compilers, you can write in high-level languages and go faster than you ever would if you had written in assembler. Starting with the 8400, our control software was written in a high-level language.
McLane: Was this the first DSP-based audio processor for FM in the market?
Orban: No. There were the Texar Digital Prism and the Audio Animation Paragon. But neither of those got significant market traction.

McLane: Who were the big players at this point?
Orban: There was Texar and Glen Clark. He had created the Audio Prisms that in many cases were used as pre-processors for the 8100. As I recall he eventually made a complete standalone box.
Then Frank Foti came in, originally as Cutting Edge and later rechristened to Omnia. If I recall correctly, he started out with an analog processor based on his work consulting with New York City radio stations. Then they did the original Omnia, which was their DSP processor. Its big claim to fame was anti-aliasing; and Omnia was very good at marketing.
It was fortunate that we had AKG behind us, and later Harman International after it acquired AKG in 1993, so we had the advantage of a large corporate marketing structure and went to ad agencies for the first time.
You know, back in the pre-AKG days I wrote most of the ad copy and came up with a lot of the concepts. In a different life I probably could have been an ad man.
McLane: You and Don Draper! … The 1990s was a very productive stretch for you.
Orban: It was indeed. We called the 8200 the first commercially successful FM processor with DSP, and it had a 10-year run. I think we sold around 5,000 units.
Then we built on it with the Optimod-FM 2200, a lower-priced product with two bands, and the original 9200, using substantially modified 8200 code, tweaked for the needs of the AM market. And the Optimod-TV 8282 was the first all-digital audio processor for television.
Also, in 1994 the DSE 7000 digital audio workstation, made by Barry Blesser’s group in Cambridge, Mass., was rebranded as an Orban product. We did some of the DSP for that.
McLane: Remembering the workstation raises a question for me of what the company name Orban meant to you as a businessperson. AKG and later Harman were taking Orban beyond audio processing.
Orban: It wasn’t up to me, but as long as the brand also stayed on audio processors, I was happy. If AKG and Harman wanted to leverage the brand to go into other broadcast-related fields — and as long as the quality was there, which was always the case — that was fine with me.
McLane: Did the change to Harman International four years after the AKG deal affect you in significant ways?
Orban: Harman was a much bigger corporation than AKG and had a big consumer business too. Eventually they would decide that for a company with sales of hundreds of millions of dollars, Orban was really too small to spend a lot of their corporate energy on. It would lead to the eventual spinoff to CRL in 2000.
McLane: In the 1990s you not only received the NAB Radio Engineering Achievement Award but you also shared the Scientific & Engineering Award from the Academy of Motion Picture Arts and Sciences, receiving it with Claus Wiedemann and Dolby Labs.
Orban: There’s a funny story. I’d known the folks at Dolby for a long time, I knew Ray and Ioan Allen and a few others. They were up for an Academy Award for a product called the Container, a multi-band processor used to protect the light valve in the optical sound recorders used for Dolby Stereo when the soundtrack was put on film. I think it was Ioan who called me and said, “Well, we were looking through the patents, and lo and behold, it looks like we’re infringing one of yours. So instead of licensing, how would you like to share the Academy Award with us?”
Licensing wouldn’t have made us very much money because there aren’t that many optical recorders out there, so the Dolby unit was a very specialized, low-volume product. So I said, “Sure … sounds like fun!”
Accordingly, I got to attend the award ceremony, and I got my award from Sharon Stone, the closest I’ve ever been to a big Hollywood celebrity.
McLane: That’s pretty close.
Orban: A good time was had by all.
McLane: I don’t want to hear about any party nastiness at the after-party! Seriously you must have felt a bit like you were atop the engineering world in broadcasting. And then comes the Telecommunications Act, a watershed in our business. Did consolidation bring important changes in what you were doing?
Orban: Not to a great extent, though eventually the loudness wars were deemphasized.
I remember visiting a friend in New York in the 1980s. I punched up the New York FMs on the dial, and I couldn’t find one that I could stand to listen to. They were all so distorted. I really did not understand what they were thinking.
One of the good things about consolidation is that processing could be turned down and do what it was intended to do, which is to provide consistent loudness and spectral balance. You could use the entire potential reach of the transmitter without getting so obnoxious in terms of processing artifacts that you would drive away more people than you would gain by taking advantage of the coverage.
McLane: And in the 1990s we’re starting to think about Digital Audio Broadcasting. How did that start to play out at Orban?
Orban: Greg Ogonowski kept his association with Orban and eventually joined us as VP for new product development. Our first DAB processor was the Optimod-DAB 6200 for DAB, DTV and netcasting. It was based partly on the 8200’s code, but we had to go to a 48 kHz sample rate because it was a 20 kilohertz audio bandwidth system.
A lot had to be rewritten. We had to develop new peak limiters, because FM peak limiting is inappropriate for DAB.
At Greg’s urging, a few years later we would also develop the Optimod PC 1100, a DAB processor on a PCI sound card.
Next time: CRL Systems, HD Radio and the 8400.
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