外文翻譯資料----語(yǔ)音電子密碼鎖的設(shè)計(jì)-其他專業(yè)-全文預(yù)覽
【正文】 FLASH, and other devices, coupled with appropriate external circuit and supporting Sunplus pany39。nSPTM mand system also provides high puting speed of 16 16bit multiplication instructions and directives within the plot operation, the DSP for the application of additional features in a plex digital signal processing both Very convenient than the DSP chip for much cheaper. ? voice input circuit SPCE061A builtin 8channel 1 Obit A / D converter, which will be seven channels for analog signals (such as voltage signal) converted to digital signals, a channel used only for voice input, through the builtin automatic gain control amplifier The microphone channels (MICIN) input. Therefore, it can be directly given to the voice signal input channels, the pletion of 8 kHz voice signals in the collection, encoding and storage to offchip FLASH, simplifying the circuit design. 3 ? audio output circuit Sunplus SPCE061A MCU with audio output of dualchannel 1 Obit D / A converters can plete user training, identification of various operations, such as the voice prompts. SPCE061A provide audio lose A way for the dualchannel DAC, in this manner, DAC1 and DAC2 conversion of analog current output signal passed AUD1 and AUD2pin output, enter the number of volume into the PDAC1 (write) (0 x7017) and P DAC2 (write) (0 x7016) unit. ? six Qiduan display of digital circuits LED displays in each LED through 5 ~ 20mA current to achieve the normal brightness, and the IO I SPCEO61A output current up to 5 mA, do not have to drive circuit to reach normal brightness. In order to meet the reliability of systems design, driven by a transistor circuit. The whole process showed that the use of dynamic, that is, six monitors each cycle, each sustained lms or 10 ms cycle again, can also be appropriate to make changes, but the refresh rate not less than 30 per second, so that temporary stay because of the visual phenomenon , Is six Qiduan see the LED display at the same time show. ? Matrix keyboard scan circuit Enter key part of a total of the number keys, passwords, keys set, the key shown password, to confirm removal of keys and passwords, and other key 16 keys, enter your password and for the realization of function keys. This design uses a wakeup function keys of the IO low eight IOA0 ~ IOA7 to 4 4 as the control input of the keyboard, which can be rational use of hardware resources and programming flexibility. Recognition keyboard keys are pressed whether the method is: Let all out lines are low, check the traffic on whether there is a highlevel, if there is a statement that a key is pressed, if not, then no keys are pressed (Actual programming keys should be taken into account the impact of jitter, usually always use the software delay processing methods Consumers buffeting). Identify specific keys used scanning method: homebyzero level out and check the level
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