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There is at least on class of voice modems the article didn't mention: The type 407 modem. In the 1980-1984 time period, I was part of a project to build a system for approving-disproving checks at some point of sale. The customer came to us, and wanted a way for a retailer to use a touch-tone phone to input a check routing code, have their database provide a determination of the check being good or bad, and returning a message via voice sysnthesizer to the customer on the telephone. In a nutshell, anyway. Their competitors kept requiring the retailers to purchase phones with integral card readers (for reading mag stripe credit cards). I designed and built the box with the speech synthesizer, and it sat between the customer's computer, and a type-407 modem. The Bell 407 modem was a large rack of many modems. Too pricey. Too big a hardware investment if you just wanted one incoming line. But we found something called a Tuck 407. The Tuck 407 utilized a 300-baud modem chip, and the one we had only could transmit in this mode. We didn't use this mode. We used the mode that utilized a touch-tone decoder and fed the digits out the modem's serial port. The modem also featured an input for audio, which it fed back into the phone lines. Thus, a voice modem. But the price of teh Tuck 407 was still somewhat pricey at $400 each. I only ever saw two of them cross my workbench, and they were resold to the customer. My company built their own type 407 modem. They wanted basically a pc board level product that had the same footprint as the voice synthesizer board, so they could both be placed in the same enclosure (card rack). Eventually, that was done. It also chewed up about $30K in R&D costs. But it worked very well. It would have implemented the AT-style instruction set, but nobody was sure how to shoe-horn that on top of the hardware we'd built, that relied on extra control pins of the RS-232 connector into the modem. Several sample units were built, the product passed it's FCC part 15 and part 68 requirements, and only 2 initial sample modem boards ever made it to the customer that had also bought the two Tuck 407 modems. The plans for the 407 modem got burned up in a fire. Almost like in a novel, it was so classic. |