外文翻譯--微型計(jì)算機(jī)的數(shù)字音頻接口processor-based數(shù)據(jù)記錄系統(tǒng)(參考版)
2025-05-17 06:54本頁(yè)面
【正文】 Unitrade Inc., Philadelphia, PA) these signals are available on a 25pin connector at the rear of the chassis. A ribbon cable extension is used to connect these lines to a similar connector mounted on one side of a 5 x x plastic box. Pointtopoint wiring within the box connects the data lines to a 37pin connector mounted on the opposite side of the box, connects the clock lines to a channel selector switch, and routes control lines for the VCR from the 37pin connector to a 5pin hex connector. A second ribbon cable extension connects the 37pin connector of the switch box to the matching connector of a plugin puter board. FIGURE 1 Electronic circuitry of digital interface. The parallel digital output of the digital audio processor is routed to ports A and B of an 8255 programmable peripheral interface chip on a P1012 puter board. The 8255 is programmed to convert each 16bit data word to two 8bit words for transfer on the puter bus. Wiring between a DB25 connector and a DC37 connector in the switch box facilitates connection of the digital audio processor to the P1012 puter card. Choice of digital audio processor data channel is made by switch selection of the clock signal to be connected to handshaking inputs of the 8255 port C. Components added to the PI012 card activate the play, rewind, and stop functions of the video cassette recorder via optoisolators under the control of bits 6 and 7 of port C. The puter board we now employ (model PIO12,MetraByte Corp., Taunton, MA 02780) was modified to allow puterized control of the VCR. This board contains an 8255 programmable peripheral interface chip (Intel Corp., Santa Clara, CA), a data bus buffer, and an address decoder. An unused area at the top of the circuit board provides ample room for wire wrap integrated circuit sockets which house the additional ponents shown in Fig. 1. Connections from the added ponents to the existing board may be made with short jumpers soldered to the circuit side of the board. The only other modification required is the removal of power supply voltages from pins 12, 14, 16, and 18 of the 37pin connector so that these lines may be used for VCR control. The 5 V, 12 V, and + 12 V lines are not required and are best interrupted by cutting three circuit board traces near their contacts with the puter bus. Removal of + 5 V from pin 18 requires cutting of two wide traces which approach the top and bottom of the 37pin connector on the ponent side of the board and installation of a jumper to reconnect these two + 5 V traces. The play, stop, and rewind functions of our VCR (model SLHF450。 A MICROCOMPUTER INTERFACE FOR A DIGITAL AUDIO PROCESSORBASED DATA RECORDING SYSTEM THOMAS L. CROXTON, STANLEY J. STUMP, AND WILLIAM McD. ARMSTRONG Department ofPhysiology and Biophysics, Indiana University School ofMedicine, Indianapolis, Indiana 46223 ABSTRACT An inexpensiv
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