1、数字调频又称移频键控，简记为FSK，它是载波频率随数字信号而变化的一种调制方式。
2、利用基带数字信号离散取值特点去键控载波频率以传递信息的一种数字调制技术。
3、除具有两个符号的二进制频移键控之外，尚有代表多个符号的多进制频移键控，简称多频调制。
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4、一种用多个载波频率承载数字信息的调制类型。
5、最常见的是用两个频率承载二进制1和0的双频FSK系统。
6、FSK （频移键控） ，也称为移频调制和移频信号。
7、 Frequency Shift Keying is a data signal converted into a specific frequency or tone in order to transmit it over wire, cable, optical fiber or wireless media to a destination point.频移键控是一个数据信号转换成特定频率或音调，以便将其转交超过电线，电缆，光纤或无线媒介，以一个目的地一点。
8、 The history of FSK dates back to the early 1900s, when this technique was discovered and then used to work alongside teleprinters to transmit messages by radio (RTTY).历史上的FSK可以追溯到20世纪初叶，当这一技术被发现，然后用并肩工作， teleprinters传递信息，由电台（ rtty ）。
9、 But FSK, with some modifications, is still effective in many instances including the digital world where it is commonly used in conjunction with computers and low speed modems.但在FSK ，作出一些修改，但仍然有效，在许多事例中，包括数位世界中，这是常用的结合电脑和低速调制解调器。
10、 In fact, the contributions of FSK are much more far reaching.事实上，在捐款的FSK更为深远。
11、 For example, the principle of FSK has laid the path to the development of other similar techniques such as the Audio Frequency Shift Keying (AFSK) and Multiple Frequency Shift Keying (MFSK) just to name a few.举例来说，原则上的FSK奠定了发展的路径其他类似技术，如声频移键控（ afsk ）及多频移键控（多进制频移键控）刚刚仅举几例。
12、In Frequency Shift Keying, the modulating signals shift the output frequency between predetermined levels.在频移键控，调制信号转移输出频率之间预定的水平。
13、 Technically FSK has two classifications, the non-coherent and coherent FSK.技术上的FSK有两个分类，非相干和相干的FSK 。
14、 In non-coherent FSK, the instantaneous frequency is shifted between two discrete values named mark and space frequency, respectively.在非相干的FSK ，瞬时频率是转移双方离散值命名为马克和空间频率，分别为。
15、 On the other hand, in coherent Frequency Shift Keying or binary FSK, there is no phase discontinuity in the output signal.在另一方面，在相干频移键控或二进制的FSK ，是没有间断期在输出信号。
16、In this digital era, the modulation of signals are carried out by a computer, which converts the binary data to FSK signals for transmission, and in turn receives the incoming FSK signals and converts it to corresponding digital low and high, the language the computer understands best.在这数字化时代，调制的信号是由一台电脑，而转换为二进制数据的FSK信号的传输，从而获得来袭的FSK信号转换为相应的数字低及高，语言的计算机理解最好的。
17、There are Frequency Shift Keying standards, used in various countries across the globe.有频移键控标准，可应用在许多国家，在全球各地。
18、 They are the ETSI FSK, Bellcore FSK, BT (British Telecom) FSK and CCA (Cable Communication Association) FSK.他们是欧洲电信标准协会的FSK ，贝尔的FSK ，英国电信（英国电信）的FSK及文建会（电缆通信协会）的FSK 。
19、 The Bellcore standard is used in United States, Australia, China, Hong Kong and Singapore.在贝尔标准是用来在美国，澳大利亚，中国，香港和新加坡。
20、 It uses the 1200 baud Bell 202 tone modulation and the first bit of data is transferred after receiving the first ring tone.它使用1200波特率贝尔202音频调制和第一位元的资料传送接收后首铃声。
21、The BT FSK or British Telecom Frequency Shift Keying is an original standard that was developed by the British Telecom.英国电讯的FSK或英国电信的频移键控，是原来的标准，这是由英国电信公司。
22、 This standard wakes up the display with a line reversal and transmits the data as CITT V23 modem tones, a format similar to MDMF.这个标准醒来，展示同一条线扭转和传递数据，作为citt v23调制解调器铃声，格式相似mdmf 。
23、 British Telecom itself uses this standard as well as some wireless networks such as the late Lonica and some cable companies as well.英国电信本身使用这个标准，以及部分无线网络，如已故lonica及一些有线电视公司以及。
24、 More details about the British Telecom Frequency Shift Keying standards can be obtained from the document Designing Caller Identification Delivery Using XR-2211 for B.T.更详细了解英国电信频移键控标准，可以直接从该文件中的设计来电识别交付使用XR型- 2211为英国电信 or the Supplier Information Notes (SINs) 227 and 242.或供应商的资料，笔记（罪过） 227和242 。
25、In Cable Communication Association standard, data is sent after a short first ring, either as Bell 202 or V23 tones.在有线通信协会标准，使数据发送经过短暂的第一环，无论是贝尔202或v23铃声。
26、 Here the transport layer is more like Bellcore even though the data format looks much like British Telecom"s, because of this, European or North American kits are more likely to detect it.这里交通层更象是贝尔即使数据格式看起来很像英国电讯公司的，正因为如此，欧洲或北美袋较容易探测出来。
27、The basic principle of Frequency Shift Keying is at least a century old.基本原则的频移键控是至少一个世纪老人。
28、 Despite its age, FSK has successfully maintained its use during more modern times and has adapted well to the digital domain, and continues to serve those that need to transfer data via computer, cable, or wire.尽管其年龄， FSK信号已成功地保持了其使用过程中更现代的时代，并已适应良好，数位领域，并继续服务于那些需要传输的数据通过计算机，电缆，电线。
29、 There is no doubt that FSK will be around as long as there is a need to transmit information in a highly effective and affordable manner.这是毫无疑问的FSK会期约，只要有需要，以传递信息，在一个高效和负担得起的方式。
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