【正文】 ture of the circuit39。s timing difference is that the circuit has a memory function. Timing circuit is characterized by: not only depend on the output value of the input, but also with the state circuit in the past. It is similar to the energy storage device with the inductor or capacitor circuit, such as flipflops, latches, counters, shift register, memory circuits, and so are the typical timing circuit devices. To Introduce electronic password lock The design is the use of voice recognition technology and keyboard input, achieving a voice electronic password lock authentication system. Voice recognition and electronic password lock function of the ordinary locks, and dual role of security. The password lock safe. effective. reliable. but also has voice recognition, password Preferences. confidentiality strong, tips and other features of error. Recent years, along with reform and open policy thorough development, electronic appliance39。s swift development. People39。s living standard had the very big enhancement. Each kind of upscale electrical appliances product and the valuables have for many some unlawful elements are also more and more. This sees majority of person security consciousness also insufficient. Creates steals the phenomenon to be mon. Therefore, more and more resident families worried to the property security problem. the alarm apparatus had been solving many problems by now for the people. But in the market alarm apparatus majority of use in some big pany fiscal institution. The price is soaring, generally the people accept with difficulty. Ifredesignsand produces one kind moderatelypriced, the performance keen reliable burglar alarm, will certainly plays a more effective role in security and the guarantee property security aspect. As the electronic code lock is a password to enter the control circuits, or chips, so as to 基于 VHDL 的密碼鎖設(shè)計 18 control mechanical switches closed, the pletion of the lock, closed the task of electronic products. It39。s a lot of species, there is a simple circuit products as well as chipbased products more costeffective. Now a wider application of electronic locks is at the core people living standards improve and strengthen the sense of security, safety lockssystem bees essential, therefore a password lock, magic locks. electonic locks. Laser lock, voiceactivated lock locks, etc., they are On the basis of traditional keys, using one or more passwords, different voices: different magic field, different sound: different light beams of different images (such as fingerprints, retina, etc.) to control open the lock. In this paper, using speech recognition technology and keyboard to control the importation of the integration achieve a voice on the electronic certification system password lock. This system is mainly posed of MIC input circuit, voice output circuit. 4 x 4 keyboard, six Qiduan LED display and output control and FLASH memory ponents. System is the main function: the training, the speaker39。s voice through a microphone into the speaker voice signal acquisition frontend. circuit, by voice signal processing circuit on the acquisition of the characteristics of voice signals and voice processing, from the speaker39。s personality characteristics and parameters Store, a speaker parameters database. In recognition, will be voice recognition and speaker parameters database matching, voice recognition and plete control of the keyboard. and activate or release of locks, the final pletion of the lock . System is relying on hardware and software to closely cooperate SCM flexible control achieved. Voice entry due to the interference of external environment, it is possible errors. but through a number of training can make parison and identification of voice greatly improved. LED displays in each LED through 5 20mA current to achieve the 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. 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 10 low eight IOAO ～ IOA7 t0 4 x 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 of the carriageway of the changes, if a line from the low level into a high, this trip can be sure this column crosspoint Button is pressed.