詞語解釋
“相移鍵控”是一種用于數(shù)據(jù)傳輸?shù)逆I控技術(shù)，它是一種將信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)的技術(shù)，它可以把模擬信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，然后進(jìn)行傳輸。相移鍵控是一種基于相移的鍵控技術(shù)，它的主要原理是通過將輸入的模擬信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，然后將數(shù)字信號(hào)通過鍵控的方式進(jìn)行傳輸，從而實(shí)現(xiàn)模擬信號(hào)的傳輸。 相移鍵控的應(yīng)用主要是用于模擬信號(hào)的傳輸，它可以將模擬信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，然后通過鍵控的方式進(jìn)行傳輸，從而實(shí)現(xiàn)模擬信號(hào)的傳輸。它可以用于多種模擬信號(hào)的傳輸，如語音信號(hào)、視頻信號(hào)等。相移鍵控的優(yōu)勢在于可以提高信號(hào)的傳輸效率，減少信號(hào)的失真，并且可以把模擬信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，從而使信號(hào)的傳輸更加穩(wěn)定。 相移鍵控的應(yīng)用非常廣泛，它可以用于無線電通信、數(shù)據(jù)傳輸、視頻傳輸、語音傳輸?shù)�。例如，在無線電通信中，相移鍵控可以將模擬信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，然后通過鍵控的方式進(jìn)行傳輸，從而實(shí)現(xiàn)模擬信號(hào)的傳輸。在視頻傳輸中，相移鍵控可以將視頻信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，然后通過鍵控的方式進(jìn)行傳輸，從而實(shí)現(xiàn)視頻信號(hào)的傳輸。在語音傳輸中，相移鍵控可以將語音信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，然后通過鍵控的方式進(jìn)行傳輸，從而實(shí)現(xiàn)語音信號(hào)的傳輸。 總之，相移鍵控是一種用于數(shù)據(jù)傳輸?shù)逆I控技術(shù)，它可以把模擬信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)，然后通過鍵控的方式進(jìn)行傳輸，從而實(shí)現(xiàn)模擬信號(hào)的傳輸。它的應(yīng)用非常廣泛，可以用于無線電通信、數(shù)據(jù)傳輸、視頻傳輸、語音傳輸?shù)�，可以提高信�?hào)的傳輸效率，減少信號(hào)的失真，從而使信號(hào)的傳輸更加穩(wěn)定。 Phase Shift Keying -- 相移鍵控 在某些調(diào)制解調(diào)器中用于數(shù)據(jù)傳輸?shù)恼{(diào)制系統(tǒng)，在最簡單的方式中，二進(jìn)制調(diào)制信號(hào)產(chǎn)生0和1。載波相位來表示信號(hào)占和空或者二進(jìn)制1和O。對(duì)于有線線路上較高的數(shù)據(jù)傳輸速率，可能發(fā)生4個(gè)或8個(gè)不同的相移，系統(tǒng)要求在接收機(jī)上有精確和穩(wěn)定的參考相位來分辨所使用的各種相位。利用不同的連續(xù)的相移鍵控，這個(gè)參考相位被按照相位改變而進(jìn)行的編碼數(shù)據(jù)所取代，并且通過將相位與前面的位進(jìn)行比較來檢測。 Phase-shift keying (PSK) is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference signal (the carrier wave). Any digital modulation scheme uses a number of distinct signals to represent digital data. In the case of PSK, a finite number of phases are used. Each of these phases is assigned a unique pattern of binary bits. Usually, each phase encodes an equal number of bits. Each pattern of bits forms the symbol that is represented by the particular phase. The demodulator, which is designed specifically for the symbol-set used by the modulator, determines the phase of the received signal and maps it back to the symbol it represents, thus recovering the original data. This requires the receiver to be able to compare the phase of the received signal to a reference signal — such a system is termed coherent. Alternatively, instead of using the bit patterns to set the phase of the wave, it can instead be used to change it by a specified amount. The demodulator then determines the changes in the phase of the received signal rather than the phase itself. Since this scheme depends on the difference between successive phases, it is termed differential phase-shift keying (DPSK). DPSK can be significantly simpler to implement than ordinary PSK since there is no need for the demodulator to have a copy of the reference signal to determine the exact phase of the received signal (it is a non-coherent scheme). In exchange, it produces more erroneous demodulations. The exact requirements of the particular scenario under consideration determine which scheme is used.
Phase Shift Keying -- 相移鍵控 在某些調(diào)制解調(diào)器中用于數(shù)據(jù)傳輸?shù)恼{(diào)制系統(tǒng)，在最簡單的方式中，二進(jìn)制調(diào)制信號(hào)產(chǎn)生0和1。載波相位來表示信號(hào)占和空或者二進(jìn)制1和O。對(duì)于有線線路上較高的數(shù)據(jù)傳輸速率，可能發(fā)生4個(gè)或8個(gè)不同的相移，系統(tǒng)要求在接收機(jī)上有精確和穩(wěn)定的參考相位來分辨所使用的各種相位。利用不同的連續(xù)的相移鍵控，這個(gè)參考相位被按照相位改變而進(jìn)行的編碼數(shù)據(jù)所取代，并且通過將相位與前面的位進(jìn)行比較來檢測。 Phase-shift keying (PSK) is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference signal (the carrier wave). Any digital modulation scheme uses a number of distinct signals to represent digital data. In the case of PSK, a finite number of phases are used. Each of these phases is assigned a unique pattern of binary bits. Usually, each phase encodes an equal number of bits. Each pattern of bits forms the symbol that is represented by the particular phase. The demodulator, which is designed specifically for the symbol-set used by the modulator, determines the phase of the received signal and maps it back to the symbol it represents, thus recovering the original data. This requires the receiver to be able to compare the phase of the received signal to a reference signal — such a system is termed coherent. Alternatively, instead of using the bit patterns to set the phase of the wave, it can instead be used to change it by a specified amount. The demodulator then determines the changes in the phase of the received signal rather than the phase itself. Since this scheme depends on the difference between successive phases, it is termed differential phase-shift keying (DPSK). DPSK can be significantly simpler to implement than ordinary PSK since there is no need for the demodulator to have a copy of the reference signal to determine the exact phase of the received signal (it is a non-coherent scheme). In exchange, it produces more erroneous demodulations. The exact requirements of the particular scenario under consideration determine which scheme is used.
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