Добавил:
Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
Учбнк / учбнк дл ФРТ.doc
Скачиваний:
259
Добавлен:
03.06.2014
Размер:
601.6 Кб
Скачать

3. Ознакомьтесь с дополнительными словами и выражениями:

instantaneous [ˌɪnstən'teɪnɪəs] — мгновенный

quote [kwəut] — ссылаться

VHF (very high frequency) - ультракороткие волны (УКВ)

output – вывод, итог, результат

cope (with) [kəup] - справиться; выдержать, совладать

portable ['pɔːtəbl] - портативный, переносный

viable ['vaɪəbl] - жизнеспособный

ambiguity [ˌæmbɪ'gjuːɪtɪ] - неопределенность, неясность

flavour ['fleɪvə] — зд. особенность

4. Ответьте на вопросы, используя информацию текста:

1. What is the basic princile of frequency modulation? 2. What is understood as deviation? 3. For what purposes WBFM and NBFM are used? 4. What are the advantages of frequency modulation? 5. What are the distinctions between linear and non-linear amplification? 6. Are there any disadvantages of phase modulation? 7. Where is phase modulation mostly used?

5. Прочитайте предложения и определите истинны они или ложны:

1. Frequency modulation consists in impressing data onto an AC wave by varying the frequency of the wave. 2. Deviation is a spontaneous process of sending the wave in the wrong direction. 3. Wide-band is used for high-quality transmissions, like FM broadcasting stations, while narrow-band is used for speech and data. 4. FM is highly influenced by different types of noise and interference. 5. For FM signals amlification low battery power can be used. 6. Phase modulation is mostly used for analog transmissions.

6. Найдите в тексте слова и выражения, эквивалентные данным ниже:

Угловая модуляция; индуцировать, размещать (данные); величина отклонения; устойчивость сопротивляемость; при условии, что...; двусторонняя радиосвязь; усиление (сигнала); неопределенность.

7. Переведите на русский язык следующие словосочетания:

Alternating-current wave; signal level variations; audio output; portable applications; high quality bradcast transmissions; receiving hardware.

8. Вставьте пропущенные слова:

amplitude, broadcasts, carrier, narrowband, bandwidth

1. The … form is used for voice communications in commercial and amateur radio. 2. Frequency modulation requires a wider … than amplitude modulation by an equivalent modulating signal. 3. Frequency modulation (FM) is a technique used to mix (encode) an information-carrying signal onto a much higher sine wave … frequency . 4. Wideband FM (W-FM) requires a wider signal bandwidth than … modulation by an equivalent modulating signal. 5. Since the amplitude is kept constant, FM modulation is a low-noise process and provides a high quality modulation technique which is used for music and speech in hi-fidelity ....

9. Вставьте пропущенные предлоги:

1. When a signal is modulated … the radio frequency carrier, the new radio frequency signal moves up and down … frequency. 2. Wide-band signals are capable … supporting high-quality transmissions. 3. One of the advantages of FM is its resilience … noise and interference. 4. Another advantage of FM is associated … the transmitters. 5. It is possible to apply FM … a lower power stage of transmitters and use non-linear RF amplifiers.

Соседние файлы в папке Учбнк