A method to identify the modulation levels of M-ary Quadrature Amplitude Modulation ( M-QAM) and M-ary Amplitude shift keying ( M-ASK) was developed to rapidly and automatically identify the modulation levels of digitally modulated signals at low signal-to-noise ratios ( SNR).

Punctured convolutional coding with an 8, 16 and 32 differential amplitude and phase shift keying ( DAPSK) modulation is considered.

研究带删除卷积码的8、16、32差分幅/相移键控（DAPSK）调制。

Second, the paper analyzes the single-pulse modulation which includes pulse amplitude modulation, on-off keying modulation, pulse position modulation and two-phase modulation.

其次分析了单脉冲调制中的脉冲幅度调制、开关键控调制、脉冲位置调制和二相调制。

At present, many researches about all-optical wavelength converters only based on the signal modulation formats of binary amplitude shift keying ( OOK) and differential phase shift keying ( DPSK), but it is very few to the signal modulation format of polarization shift keying ( PolSK).

目前，全光波长转换器的研究主要集中在二进制振幅键控（OOK）和差分移相键控（DPSK）信号调制格式，对于偏振移位键控（PolSK）信号调制格式全光波长转换的研究很少。

Thirdly, we quantify the power penalty caused by the PMD in optical subcarrier multiplexing ( OSCM) system with amplitude shift keying ( ASK) and binary phase shift keying ( BPSK).

第三，对采用不同调制格式（包括幅移键控和二进制相移键控）的光副载波复用（OSCM）系统中，PMD引起的功率代价进行了量化。

The Binary phase shift keying ( BPSK) and Mary amplitude shift keying ( MASK) are widely used in radar systems, their elliptic covariance do not equal zero, are noncircular signals.

二进制相移键控（BPSK）和幅度调制（MASK）等信号是雷达系统中常用的信号，这种调制信号的椭圆协方差矩阵不为零，被称为非圆信号。

This is called "amplitude shift keying".

这就是所谓的“振幅键控”。

All digital receiver of quadrature phase shift keying with large frequency shift correction

四相相移键控调制的抗大频偏的全数字接收机

In modern Sonar equipment the several signal operation modes are usually required, for instance, the keying single frequency signal operation mode, the keying frequency modulation signal operation mode and etc.

在现代声纳中常要求在一部声纳中同时具有几种信号工作方式的功能，例如单频脉冲信号工作方式、键控式调频信号工作方式等等。

The Design of High Stability Keying Frequency Modulation Oscillator

高稳定度键控调频信号发生器设计

A magic packet is data consisting of "FF FF FF FF FF FF" followed by16 repetitions of the listening network device's MAC address.

神奇的数据包组成的“法郎法郎法郎法郎法郎法郎”，接着16日重复的听网络设备的MAC地址。

Previous sorties in a 314 square kilometer ( 120 square mile) zone where a U.S. Navy listening device earlier picked up signals consistent with locator beacons on the aircraft's 'black box' flight recorders failed to find any trace of the plane.

早些时候美国海军一侦听设备疑似探测到客机“黑匣子”发出的位置信号，蓝鳍-21随即对附近314平方公里（120平方英里）的海域进行搜寻，但未找到飞机的任何迹象。

Outdoorsmen and bird watchers can tap into Mother Nature's secrets like never before and be thrilled at the sound quality of this ingenious listening device.

外面的人和鸟类观察者从未像现在这样领略到大自然的秘密，并对此巧妙的器音质激动不已。

Blogging is a communication tool, a marketing technique, a listening device, and a way to interact directly with customers one-to-one on a global scale.

博客是交流工具，市场手段，倾听渠道和在世界范围内和顾客一对一直接互动的方法。

Now you can eavesdrop from a safe distance with the Orbitor Electronic Listening Device.

现在你可以用这个电子装置在一个安全的距离。

The spy staged a break-in to plant a listening device.

（间谍破门而入，安装窃听装置。）

Any personal listening device out there has the potential to be used in a way that will cause hearing loss.

无论哪一种随身听都有对人造成听力丧失的潜在危险。

The failing light was such that observation by periscope could not be relied on, and the Upholder's listening gear was out of order.

当时天色昏暗，难以用潜望镜观察，而潜艇的听音设备也坏了。

Well, the other day I was listening to that radio station for kids, K.I.D.Z.... Hey, kidz.

那个，前几天我在听kids广播，KIDZ，嘿，是儿童广播。

When I could not fall asleep on bed, I turned on the radio and always listening the same station.

以前我常常在睡不着的时候开着收音机而且总是听那一个台。

UK newspaper The Independent has published claims that Britain has been operating a "covert listening station" in Berlin, with hi-tech equipment mounted on the embassy roof.

英国《独立报》上已经有消息称，英国一直在柏林运营一个秘密监听电台，该电台的高科技监听设备被安装在大使馆屋顶上。