数字式调频收音机设计 介绍利用数字锁相频率合成技术构成收音机的电调谐部分并阐述了收音机的调台、选台、搜索与存储等功能的电路设计原理,着重介绍了用收音机集成芯片CXA1019S构成的FM电路、频率合成器芯片BU2614构成的锁相环电路。- 下载
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数字选台收音机 注意: (1)遥控发射芯片用TC9012/TC9243 经常用到的还有UPD6121和LC7461,它们的不同只处在于引导码的时间不同或者数据位的个数不同,接受原理基本一样。将本程序的相关位置修改就可以通用。 系统时钟22.1184MHZ,如果用其他的时钟请将delay.c文件中的定时器装载值修改一下 (2) 键盘检测在VFD程序中,16312可以驱动VFD,另外外部可接24个按键,并将按键值放到 其内部的存储中,使用时只须发命令读即可。 (3) 由于时间原因,只给出调幅波段的自动搜台功能,调频的自动搜台程序和调幅一样,自己写了。 (4)主要用在组合机和功放机上的收音头大部分以LC72171做锁象环,LA1823做高中频处理 和音频解调,但是有的数调收音头把锁象环和高频处理做在一起,典型的有TEA5757和TEA5756 TEA5757采用了一种所谓的自动调谐系统,在自动搜索时无须读中频,简化了程序。-digital radio attention to the election : (1) remote control chip with TC9012/TC9243 launch frequently used were UPD6121 and LC 7461, the only different is that the lead time for different code or data of the number of different spaces, accept the basic tenets of the same. Will be the location of the relevant procedures can be revised definitive. System Clock 22.1184 MHZ. If the clock I would be grateful if other delay.c document loading value of the timer changed a bit (2) keyboard detection V FD procedure, 16312 can drive VFD, and the external access 24 button. and keystroke values into its internal memory, use only the order can be read. (3) For reasons of timing, given only the AM band automatic search function Taiwan FM automatic seizure procedures and Taiwan AM, himself wrote a. (4) 下载
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ZModem通讯程序开发的例子 我们常说的Modem,其实是Modulator(调制器)与Demodulator(解调器)的简称,中文称为调制解调器。也有人跟据Modem的谐音,亲昵地称之为“猫”。我们知道,计算机内的信息是由“0”和“1”组成数字信号,而在电话线上传递的却只能是模拟电信号。于是,当两台计算机要通过电话线进行数据传输时,就需要一个设备负责数模的转换。这个数模转换器就是我们这里要讨论的Modem。计算机在发送数据时,先由Modem把数字信号转换为相应的模拟信号,这个过程称为“调制”。经过调制的信号通过电话载波传送到另一台计算机之前,也要经由接收方的Modem负责把模拟信号还原为计算机能识别的数字信号,这个过程我们称“解调”。正是通过这样一个“调制”与“解调”的数模转换过程,从而实现了两台计算机之间的远程通讯。-dial communications program example, we often said that the modem is actually Modulator (modulator) and Demodulator (demodulator) referred to the Chinese as a modem. It was also According Modem transliterations disputed call "cat." We know that the computer information is from "0" and "1" digital signal components, and the transfer of telephone lines has only analog signals. So, when two computers through telephone lines for data transmission, the need for a digital-analog equipment conversion. The Digital is here to discuss the modem. The computer sent the data, the first Modem signal conversion figures for the corresponding analog signals, the process is known as "modulation." After modulated carrier signal transmitted by telephone to another compu 下载
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