外文翻譯--公交車自動報站系統(tǒng)-全文預覽
【正文】 c coupler current transmission 10% ~ 25%, than for less than 10us response time. About speech output circuit design This series of chip required by the microprocessor or micro controller series through serial peripheral interfaces and serial interface addressing and control. The recording data is stored method of multistage storage is through ISD patent technology implementation, with sound and audio signals directly in the natural form of solid state memory, thus providing high quality replay the fidelity of speech. ISD4004 voice recording devices for kHZ sampling frequency, time and recording a single chip 8 points, 10 points, 12 points, 16 points several, and its use of builtin FLASH memory cost nonvolatile CaXie memory, this fast data, and it is not lost power save data department needs power consumption. The typical stored information can save time up to 100 years, the same storage unit can be repeated be recorded 10 million times. IAD4004 chip audio output pin can drive a five thousand uefa load, when device after power up, change the power output pins for v. to this design of chosen amplifier is LM386 is for low voltage application design audio amplifier, the working voltage of 6V, maximum distortion degree of , power frequency response to 20 ~ 100 KHZ About LED display output design: This circuit USES 16 * 256 destem to display 16 16 * 16 Chinese characters, using the video memory U14 to deposit the characters bitmap information. Screen points page 32, each page 16 line 8 column LED by constitute the light emitting diode, destem with a four 16 decoder 74LS154 decode, will address A0 A3 decode formed by two do signal, 416 decoder 74LS154 form a 532 decoder, carries on the page decode, will address A4 A8 decode form page, choose munication, respectively, to choose a 74LS244 general 74LS244 data through this system to a
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鄂ICP備17016276號-1