The integrated circuit package with the metal lid removed, revealing the silicon die. I will discuss these circuitry blocks in detail below. The overall layout of the chip is dense rectangles of circuitry with the space between them used for signal routing. Underneath the metal, the polysilicon wiring layer appears reddish or greenish.įinally, the underlying silicon is grayish. (Power and ground are the thick metal lines.) The chip has one layer of metal, visible as the whitish lines on top. 6Īround the edges, you can see the 64 bond wires attached to pads these connect the silicon die to the chip's 64 pins. I created the high-resolution die photo below by compositing over a hundred microscope photos. In this blog post, I investigate the operator chip and how it digitally produced sounds using a technique called FM synthesis. Which it fed to the YM21280 5 OPS "operator" chip that generated the sound waveforms. Instead, the DX7 used two custom chips: the YM21290 EGS "envelope" chip generated frequency and envelope data, Weren't fast enough to do this in the early 1980s. While digital synthesis is straightforward nowadays, microprocessors 4 2Ĭompared to earlier synthesizers, the DX7 was compact, inexpensive, easy to use, and provided a new soundscape. The DX7's electric piano sound can be heard in over 40% of 1986's top hits. It defined the sound of 1980s pop music, used by bands from A-ha and Michael Jackson to Dolly Parton and Whitney Houston. "one of the most important advances in the history of modern popular music" 1. The Yamaha DX7 digital synthesizer was released in 1983 and became
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