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将缩略词译为汉语: AM -

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写出缩略词的英文全称: IT -

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将缩略词译为汉语: FSK -

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Morse used electromagnetic induction to transfer information in the form of dots, ____, and spaces between a simple transmitter and receiver.

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汉译英: 模拟信号 -

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汉译英: 通信，交流 -

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写出缩略词的英文全称: FM -

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汉译英: 电路 -

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汉译英: 电子通信系统 -

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英译汉: metallic wire -

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汉译英: 电报 -

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汉译英: 商业广播 -

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将缩略词译为汉语: PSK -

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英译汉: alphanumeric code -

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英译汉: triode vacuum tube -

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Electronic communications can be summarized ____ the transmission, reception, and processing of information ...

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将缩略词译为汉语: FM -

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汉译英: 离散信号 -

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写出缩略词的英文全称: AM -

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英译汉: electromagnetic induction -

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汉译英: 微波 --

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写出缩略词英文全称: DSP --

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写出缩略词的英文全称: CDMA --

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英译汉: overall cost --

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首字母已给出，作答时请写出完整单词。Modern electronic communication systems include metallic c____ systems, microwave and satellite radio systems, and optical fiber systems。

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汉译英: 子系统 --

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汉译英: 通信行业 --

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汉译英: 卫星 --

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首字母已给出，作答时请写出完整单词。It has been proved that induced voltage causes a current to flow in o____ to the force producing it .

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汉译英: 奇偶校验位 --

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首字母已给出，作答时请写出完整单词。In a hybrid system, the signal processor may be an analog - to - digital c____ .

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汉译英: 纠错 --

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汉译英: 检错 --

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英译汉: optical fiber --

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英译汉: analytic geometry --

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写出缩略词的英文全称: GSM --

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英译汉: transistor --

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汉译英: 样本，采样 --

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汉译英: 带宽 --

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写出缩略词的英文全称: PCM --

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汉译英: 干扰; 干涉 -

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首字母已给出，请写出完整单词 The ITU is a s____ agency of the United Nations.

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汉译英: 轨道; 沿轨道飞行----

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英译汉: tariff -

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汉译英: 子系统--

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英译汉: megahertz -

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汉译英: 电视中继 -

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写出缩略词的英文全称: GPS -

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汉译英: 短波 -

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写出缩略词英文全称: SSB -

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英译汉: Q - factor -

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首字母已给出，请写出完整单词 Note that although the telephone was developed late in the nineteenth century, the first transatlantic telephone cable was not completed u____ 1954.

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汉译英: 信道 -

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汉译英: 信源--

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英译汉: histogram -

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汉译英: 半导体 -

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英译汉: on an international basis -

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汉译英: 雷达 -

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汉译英: 调制解调器 -

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英译汉: allowable error -

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介词填空 An algorithm is given that reduces the number of multiplications by almost a factor ____ two but increases the number of additions.

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Each member nation of the ITU retains sovereignty over the spectral usage and standards adopted in its t____ .

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The two most significant l____ on the performance of a communications system are noise and bandwidth.

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This encourages a full a____ of telecommunication services to be economically provided

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The amount of information that can be propagated through a transmission system is a function of system bandwidth and transmission t____ .

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If a cable television transmission system has a p____ from 500kHz to 5000 kHz, it has a bandwidth of 4500kHz.

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each nation is expected to a____ by the overall frequency plan and standards that are adopted by the ITU.

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Information theory can be used to c____ the capacity of a communications system.

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The bandwidth of the communications channel must be equal to or greater than the b____ of information.

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汉译英: 高保真

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The bandwidth of a communications channel is the difference between the highest and lowest frequencies that the channel will allow to p____ through it.

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汉译英: 许可(证), 执照； 许可, 特许

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汉译英: 信息论

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The Telecommunication Development Sector (ITU - D) provides technical a____ , especially for developing countries.

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Usually, each nation establishes an a____ that is responsible for administration of the radio frequency assignments within its borders.

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The bandwidth of an information signal is simply the difference between the highest and l____ frequencies contained in the information.

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____ the sake of accuracy and convenience, the magnetic effect is utilized almost universally in electric measuring instrument .

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ACT signal is also called an analog signal because its waveform is often analogous __ that of the physical variable.

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Most discrete - time signals arise ____ sampling continuous - time signals .

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Lamps are lighted ______switch on.

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If the channel propagates baseband signals, no c____ circuits are neede.

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For a standard voice - band communications channel with a signal - to - noise power ratio of 1000(30 dB) and a bandwidth of 2.7 kHz, the Shannon l____ for information capacity is l=26.9 kbps.

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Carrier circuits are needed when the t____ channel is located in a band of frequencies around fc>>0.

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This equation shows that information capacity is a linear function and directly p____ to both system bandwidth and transmission time.

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汉译英: 信息容量:

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In this case, e____ energy is converted into mechanical energy.

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Hartley's law simply states that the wider the b____ and the longer the time of transmission, the more information that can be conveyed through the system.

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汉译英: 带通信号:

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If the bandwidth of a communications channel doubles, the amount of i____ it can carry also doubles.

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The mapping of the baseband input information waveform into the bandpass signal s(t) is called m____ .

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The transmitter carrier circuit converts the processed b____ signal into a frequency band that is appropriate for the transmission medium of the channel.

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Compression, ______ the name implies, deals with techniques for reducing the storage required to save an image, or the bandwidth required to transmit.

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This chapter develops mathematical tools that are used to describe signals and noise from a deterministic waveform point ____ view.

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写出缩略词的英文全称: RMS 均方根:

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汉译英: 相位谱:

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汉译英: 峰值:

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The physical waveform is of finite duration, but the duration of the mathematical waveform extends to i____.

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写出缩略词的全称: 交流电 AC:

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The waveform will be represented by direct mathematical expressions or by the use of o____ series representations such as the Fourier series.

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汉译英: 传输介质: