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毕业设计
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DZ247电视系统遥控器的设计,毕业设计
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- 1 - 英文资料 -A high tech creative technology product! HWT-1(2) infrared explanation system along with the tourism and the display industry development, for satisfies the visitor to comprehend the scenic spot or the exhibit article essence and the cultural charm, rests on own infrared optoelectronic technology and the information processing aspect superiority, researched and developed had proprietary intellectual property rights HWT-1 to attract goes against the type; HWT-2 shoots the lamp type infrared explanation system. the cheapest way to remotely control a device within a visible range is via Infra-Red light.Almost all audio and video equipment can be controlled this way nowadays.Due to this wide spread use the required components are quite cheap.hus making it ideal for us hobbyists to use for our own projects.this part of my knowledge base will explain the theory of operation of IR remote control.and some of the protocols that are in use in consumer electronics System characteristic l this system with the infrared transmission, has exempted like the radio frequency transmission harmful puzzle, conforms to the green environmental protection requirement. l this system may applies in the room and outdoor finite space.If the scenic site has not conducted a tour also may obtain the scenic spot to introduce that, to each kind of type exposition, the exposition, the museum exhibit article may broadcast the introduction as necessary. The l visitor does not need to carry with the hand the public address system or to look the number selective calling, both hands may do photograph record and so on individuality the movements. The l infrared launcher may simultaneously the multichannel use, the different signal synchronous launch different pronunciation illustrate, for on-the-spot meeting, scene direct seeding use. Between the l multichannel is mutual non-interference, moreover does not have the static, suits in the public situation use.l this system also may in place uses and so on family room, vehicles journey, library, sanatorium, classroom, either listens to music, either study foreign language, either watches the television, achieves does not interfere others. The system composition and the principle of work HWT-1(2) infrared explanation system is composed by four parts: The infrared sound transmitter (may select and match infrared switch), the infrared earphone, the infrared pronunciation transcriber and the infrared remote control.The place must illustrate which in front of the scenic spot either the exhibit article is loaded with by the infrared wireless way receives and transmits this scenic spot or the exhibit article related content infrared sound transmitter.Listens to the number of people Daihong external ear machine, does not affect other people to listen to the pronunciation illustration from the earphone which sends by the infrared sound transmitter broadcasts.Or must broadcast the new content when the exhibit article change, in the nts - 2 - new content input infrared pronunciation transcriber reservoir, copies again into by the infrared communication way the infrared sound transmitter, uses for the broadcast.Or, does not pass through the infrared pronunciation transcriber reservoir memory, the new content by the infrared communication way input infrared sound transmitter, uses directly for the broadcast.The staff grasps the infrared remote control to record, to broadcast and the content choice carries on the control. There are at least two international standards which are used by remote controls to encode the commands, the RC5 and RECS 80 code. The RECS 80 code uses pulse length modulation. Each bit to be transmitted is encoded by a high level of the duration T followed by a low level of duration 2T representing a logical 0 or 3T representing a logical 1. Notice that a 1 takes more time to be transmitted than a 0. The RC 5 code instead has a uniform duration of all bits. A transition in the middle of the time interval assigned to each bit encodes the logical value. A 0 is encoded by a high to low transition and a 1 by a low to high transition. Therefore we need additional transitions at the beginning of each bit to set the proper start level if a series of equal bits is sent. We dont need this additional transition if the next bit has a different value. This is also called a biphase code. Instead of being fed direct into the IR emitter, most remote controls modulate a 20-30 kHz carrier with this signal. A logic one is represented by a burst of oscillations. The reason is, that you can use a filter tuned to the carrier frequency to distinguish the signal from noise in the ambient light. Fluorescent lamps are the main source of such noise. Photodiodes behind an optical filter which transmits infrared light but blocks visible light are used as detectors. The signal from the photodiode is fed through a filter tuned to the carrier fequency and then amplified. The amplified signal is demodulated just like the carrier is demodulated in any AM radio receiver. It can be a lot of pain to design a sensitive receiver that doesnt start to oscillate. It is also necessary to have some automatic gain control to avoid overload of the amplifier at close distance to the emitter. It is easier to use some integrated circuit that does all of the job. The best i have ever seen (and used) is the SFH505A manufactured by SIEMENS (no, I dont work for this company). It looks like one of this three legged voltage regulators and uses a single 5V supply. It incorporates an optical filter, the photodiode, a filter tuned to about 30 kHz , the amplifier with automatic gain control and the demodulator. If you dont know which code your remote control is transmitting you can identify it by viewing the output of your receiver with an oscilloscope. The RECS 80 code uses high pulses of uniform length while the low pulses differ in length. If there are high and low pulses of two different lengths it might be RC5 code. Note that your receiver may invert the levels. How are commands like volume control or channel selction encoded? In the case of the RC5 code there is an international standard. Every command is encoded by 14 bits. The first two bits S are startbits to allow the receiver to adjust the automatic gain control and to synchronize. Next a bit T follows, that toggles with every new nts - 3 - keystroke. Next is the address A of the device which shall respond to the command. At last the command itself follows. There are integrated decoder circuits which have inputs to select the device address and parallel outputs activated by the commands. Since this is comp. robotics the devices you wish to control will have a microcontroller on board which can do all the decoding. Here is an input routine I have written for the 8052 microcontroller family to receive RC5 codes. My cousin has written a similar routine for the RECS80 code which i will try to make available also. Perhaps we can start a collection of such routines and archive them somewhere. The Circuit Board When you unscrew the circuit board and take it out, you can see that the circuit board is a thin piece of fiber glass that has thin copper wires etched onto its surface. Electronic parts are assembled on printed circuit boards because they are easy to mass produce and assemble. In the same way that it is relatively inexpensive to print ink onto a sheet of paper, it is inexensive to print copper wires onto a sheet of fiber glass. It is also easy to have a machine drop the parts (the chips, transistors, etc.) onto the sheet of fiberglass and then solder them on to connect them to the copper wires. When you look at the board, you can see a set of contact points for the buttons. The buttons themselves are made of a thin rubbery sheet. For each button there is a black conductive disk. When the disk touches the contacts on the printed circuit board, it connects them and the chip can sense that connection. At the end of the circuit board there is an infrared LED, or Light Emitting Diode. You can think of an LED as a small light bulb. Many LEDs produce visible light, but a remotes LED produces infrared light that is invisible to the human eye. It is not invisible to all eyes, however. For example, if you have a camcorder it can see the infrared light. Point your remote at the camera and push a button. You will be able to see the infrared light flashing in the viewfinder. The receptor in the TV is able to see infrared light as well. So the basic operation of the remote goes like this: You press a button. When you do that you complete a specific connection. The chip senses that connection and knows what button you pressed. It produces a morse-code-line signal specific to that button. The transistors amplify the signal and send them to the LED, which translates the signal into infrared light. The sensor in the TV can see the infrared light and seeing the signal reacts appropriately. nts - 4 - 译文： 一个高科技的独创技术产品！ HWT-1(2) 红外讲解系统 随着旅游业及展览业的发展，为满足参观者领悟景点或展品的精华及文化神韵，依据自身的红外光电子技术和信息处理技术方面的优势，研发了具有自主知识产权的 HWT-1 吸顶式； HWT-2 射灯式红外讲解系统。在一个有形的范围控制远程装置最简便的方法是透过红外光 .现在。几乎所有的音频和视频设备可以 通过这种方式 被 控制 。 由于这种 广泛蔓延，使用必需的组件是相当便宜 。 从而使 成为我们业余爱好者为我们自己的项目 使用它作为理想的工具。我这部分的知识库中关于红外线遥控器控制相应的解释，理论的运作 ,和一些有关的议定书是在使用的消费类电子产品 系统特点 l 本系统用红外传输，免去了如射频传输的有害困扰，符合绿色环保要求。 l 本系统可在室内和室外有限空间内应用。如旅游景点没有导游也可获得景点介绍，对各种类型展览会、博览会、博物馆的展品可随时播放介绍。 l 参观者不必手提播音装置或看号选台，双手可作摄像记录等个性动作。 l 红外发射器可 同时多通道使用，不同信号同步发射不同的语音解说，供现场会议，现场直播使用。 l 多通道之间互不干涉，而且没有杂音，适合于公共场合使用。 l 本系统还可在家庭居室、车辆旅途、图书馆、疗养院、教室等场所使用，或听音乐，或学外文，或看电视，做到不干涉别人。 系统组成与工作原理 HWT-1（ 2）型红外讲解系统由四部分组成：红外播音器（可选配红外开关）、红外耳机、红外语音转录器和红外遥控器。在景点或展品前需解说的地方装有以红外无线方式接收和发送该景点或展品有关内容的红外播音器。收听人头戴红外耳机，不影响他人 地从耳机中收听由红外播音器发播的语音解说。在展品改变或需播放新内容时，将新内容输入红外语音转录器的储存器中，再以红外通信的方式转录入红外播音器，供播放用。或者，不经过红外语音转录器的储存器的存储，直接将新内容以红外通信的方式录入红外播音器，供播放用。工作人员掌握红外遥控器对录、播及内容选择进行控制。 有至少有两个国际标准，其中所使用的远程控制编码命令后， rc5 和区域经济共同体的 80 码。研究伦理委员会 80 代码使用脉冲长度调制。每比特，以传送编码是由一个高水平的期限吨其次是水平低，持续时间二吨代表一个 合乎逻辑的 0 或三吨代表一个合乎逻辑的 1 。 通知指出， 1 1 需要更多的时间传送超过 1 0 。区域市政局 5 程式码，而不是有一个统一的时间，所有位。在过渡中的时间间隔分配给每个位编码的逻辑价值。 1 0 是编码的高低过渡和 1 由低到高的过渡。因此，我们需要额外的转换在每年年初位设置适当的水平，如果开始了一系列的双边投资条约是平等的发送。我们不需要这种额外的过渡期，如果明年位有不同的价值。这也是所谓的 双相 代码。 而不是被美联储直接进入红外辐射源，最偏远的控制调节 20-30 千赫承运人nts - 5 - 与这个信号。一个逻辑，一个是代表了一阵振荡。 原因是，您可以使用过滤器，调谐到载波频率来区分信号从噪声的环境光。荧光灯是主要来源，这样的噪音。光电二极管的背后，光学过滤器，传输红外光，但大厦的可见光被用作探测器。信号从光电二极管是美联储通过一个过滤器调整，以承运人 fequency 然后扩增。扩增信号解调就像承运人解调在任何时无线电接收机。 它可以是一个很多痛苦，以设计一个敏感的接收器 doesnt 开始振荡。它也需要有一些自动增益控制，以避免超载的放大器，在近距离向辐射源。这是更容易使用
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