3. Ознакомьтесь с дополнительными словами и выражениями:

intelligent [ɪn'telɪʤ(ə)nt] – разумный

acquire [ə'kwaɪə] – получать, приобретать

finite ['faɪnaɪt] – ограниченный; конечный

сurrency ['kʌr(ə)n(t)sɪ ]; ['kɜːr(ə)nsɪ] – валюта; средство денежного обращения

vs. (from versus) – против

jerk [ʤɜːk] - двигаться резкими толчками

smoothly ['smuːðlɪ] - гладко; ровно; плавно

derive [dɪ'raɪv] - получать, извлекать

intend [ɪn'tend] – намереваться; предназначать

4. Ответьте на вопросы, используя информацию текста:

1. What is a signal in general understanding and in communications? 2. Can you give any examples of signals? 3. What's the difference between a continuous and discrete signal? 4. What is sampling? 5. How can the difference between analog and digital signals be explained? 6. What signals are typically met in nature? 7. What are the three main characteristics of an analog signal? 8. How is a digital signal represented? 9. What are bits? 10. What are baseband signals? 11. What is a pulse train? 12. What is a frequency spectrum? 13. Does bandwidth depend on the frequency spectrum?

5. Истинны или ложны следующие высказывания?

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.