GNED135-March 24 .docx

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Department
English
Course
GNED 135
Professor
Holly Pearlman
Semester
Winter

Description
Carrier Signal In analog transmission, the sending device produces a high-frequency signal that acts as a base for the information signal. This base signal is called the carrier signal or carrier frequency. The receiving device is tuned to the frequency of the carrier signal that it expects from the sender. Digital information then changes the carrier signal by modifying one or more of its characteristics (amplitude, frequency, or phase). This kind of modification is called modulation (shift keying). Amplitude Shift Keying In amplitude shift keying, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant while the amplitude changes. 144 CHAPTER 5 ANALOG TRANSMISSION Binary ASK (BASK) Although we can have several levels (kinds) of signal elements, each with a different amplitude, ASK is normally implemented using only two levels. This is referred to as binary amplitude shift keying or on-off keying(OOK). The peak amplitude of one signallevel is 0; the other is the same as the amplitude of the carrier frequency. Figure 5.3 gives a conceptual view of binaryASK. Carrier Signal In analog transmission, the sending device produces a high-frequency signal that acts as a base for the information signal. This base signal is called the carrier signal or carrier frequency. The receiving device is tuned to the frequency of the carrier signal that it expects from the sender. Digital information then changes the carrier signal by modifying one or more of its characteristics (amplitude, frequency, or phase). This kind of modification is called modulation (shift keying). Amplitude Shift Keying In amplitude shift keying, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant while the amplitude changes. 144 CHAPTER 5 ANALOG TRANSMISSION Binary ASK (BASK) Although we can have several levels (kinds) of signal elements, each with a different amplitude, ASK is normally implemented using only two levels. This is referred to as binary amplitude shift keying or on-off keying(OOK). The peak amplitude of one signallevel is 0; the other is the same as the amplitude of the carrier frequency. Figure 5.3 gives a conceptual view of binaryASK. Carrier Signal In analog transmission, the sending device produces a high-frequency signal that acts as a base for the information signal. This base signal is called the carrier signal or carrier frequency. The receiving device is tuned to the frequency of the carrier signal that it expects from the sender. Digital information then changes the carrier signal by modifying one or more of its characteristics (amplitude, frequency, or phase). This kind of modification is called modulation (shift keying). Amplitude Shift Keying In amplitude shift keying, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant while the amplitude changes. 144 CHAPTER 5 ANALOG TRANSMISSION Binary ASK (BASK) Although we can have several levels (kinds) of signal elements, each with a different amplitude, ASK is normally implemented using only two levels. This is referred to as binary amplitude shift keying or on-off keying(OOK). The peak amplitude of one signallevel is 0; the other is the same as the amplitude of the carrier frequency. Figure 5.3 gives a conceptual view of binaryASK. Carrier Signal In analog transmission, the sending device produces a high-frequency signal that acts as a base for the information signal. This base signal is called the carrier signal or carrier frequency. The receiving device is tuned to the frequency of the carrier signal that it expects from the sender. Digital information then changes the carrier signal by modifying one or more of its characteristics (amplitude, frequency, or phase). This kind of modification is called modulation (shift keying). Amplitude Shift Keying In amplitude shift keying, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant while the amplitude changes. 144 CHAPTER 5 ANALOG TRANSMISSION Binary ASK (BASK) Although we can have several levels (kinds) of signal elements, each with a different amplitude, ASK is normally implemented using only two levels. This is referred to as binary amplitude shift keying or on-off keying(OOK). The peak amplitude of one signallevel is 0; the other is the same as the amplitude of the carrier frequency. Figure 5.3 gives a conceptual view of binaryASK. Carrier Signal In analog transmission, the sending device produces a high-frequency signal that acts as a base for the information signal. This base signal is called the carrier signal or carrier frequency. The receiving device is tuned to the frequency of the carrier signal that it expects from the sender. Digital information then changes the carrier signal by modifying one or more of its characteristics (amplitude, frequency, or phase). This kind of modification is called modulation (shift keying). Amplitude Shift Keying In amplitude shift keying, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant while the amplitude changes. 144 CHAPTER 5 ANALOG TRANSMISSION Binary ASK (BASK) Although we can have several levels (kinds) of signal elements, each with a different amplitude, ASK is normally implemented using only two levels. This is referred to as binary amplitude shift keying or on-off keying(OOK). The peak amplitude of one signallevel is 0; the other is the same as the amplitude of the carrier frequency. Figure 5.3 gives a conceptual view of binaryASK.
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