2015-05-26
836
1. A signal that has a value not defined at every instant is continuous. 2. A discrete signal is represented by a time series consisting of a sequence of quantities. 3. A common digital signal configuration is the waveform represented by a sequence of three types of pulses of known shape. 4. The information contained in a digital signal is given by the particular sequence of the presence or absence of the pulses. 5. Most signals in nature are discrete. 6. The periodic sine wave is the most fundamental analog signal.
6. Найдите в тексте слова и выражения, эквивалентные данным ниже:
Электронные средства; слышимая речь; посредством света; ежегодные наводнения; ежедневные колебания валютного курса; с постоянной частотой; гистограмма; круглый циферблат; форма волны; присутствие или отсутствие импульса; уплотненный сигнал; модулированный сигнал; полоса частот.
7. Переведите на русский язык следующие словосочетания:
Intelligent information; finite time periods; decimal number display; periodic sine wave; binary waveform; binary (logic) one; binary zero; binary digit; baseband signal; frequency spectrum.
8. Вставьте пропущенные предлоги:
1. A signal can be treated as a relationship … an amplitude … time. 2. The value … a continuous signal is defined … every instant. 3. A discrete signal or a discrete-time signal is represented … a time series consisting... a sequence of quantities. 4. One way to receive dicrete signals is to acquire values … a continuous-time signal … a constant or variable rate. 5. The information contained … a digital signal is given by the particular sequence of the presence or absence of pulses... known shape. 6. An analog clock is capable … indicating every possible time. 7. We commonly refer... the transmission of voice, music, video and data as information signals. 8. Frequency is the number of cycles … second that the wave undergoes. 9. Analog or digital data are merged … other signals of higher frequency. 10. Information signals belong … baseband signals.
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9. Вставьте пропущенные cлова:
bandwidth, convey, analog, phase, digital, frequency
1. By controlling the … of the current, information can be transmitted to another medium and presented on that medium. 2. Magnetic tape on a cassette … information to the stereo which transmits it into electrical signals of specific frequencies which in turn tell the speakers what noise to make. 3. … is the rate at which the signal changes its relationship to time, expressed as degrees. 4. An … signal is a kind of signal that is continuously variable, as opposed to having a limited number of steps along its range. 5. The difference between the highest and the lowest frequencies of a signal is …. 6. A … signal is a signal that changes from one state to another in discrete steps.
10. Переведите выделенные слова с английского на русский язык, исходя из контекста:
1) scale заработной платы 2) садиться на train
огромный scale train верблюдов
двоичная scale train импульсов
электронные scales 3) rate несчастных случаев
круговая scale высокий rate от сделки
scales рыбы rate повторения (импульсов)
