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Что (кто) такое Quadrature Amplitude Modulation - определение
Найдено результатов: 220
Quadrature amplitude modulation
![The graphs of the sine (solid red) and [[cosine]] (dotted blue) functions are sinusoids of different phases.](https://commons.wikimedia.org/wiki/Special:FilePath/Sine and Cosine.svg?width=200 "The graphs of the sine (solid red) and [[cosine]] (dotted blue) functions are sinusoids of different phases.")
FAMILY OF DIGITAL MODULATON METHODS OF TELEVISION SIGNALS
QAM-modulated; Quadrature Amplitude Modulation; QAM; 256QAM; 256-QAM; 16-QAM; 16QAM; 64-QAM; 64QAM; 2-QAM; 2QAM; 4-QAM; 4QAM; 8-QAM; 8QAM; 32QAM; 32-QAM; 128-QAM; 128QAM; 512-QAM; 512QAM; 1024QAM; 1024-QAM; 2048QAM; 2048-QAM; 4096-QAM; 4096QAM; IQ Modulation; Qam
Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) analog modulation scheme.
Quadrature Amplitude Modulation
FAMILY OF DIGITAL MODULATON METHODS OF TELEVISION SIGNALS
QAM-modulated; Quadrature Amplitude Modulation; QAM; 256QAM; 256-QAM; 16-QAM; 16QAM; 64-QAM; 64QAM; 2-QAM; 2QAM; 4-QAM; 4QAM; 8-QAM; 8QAM; 32QAM; 32-QAM; 128-QAM; 128QAM; 512-QAM; 512QAM; 1024QAM; 1024-QAM; 2048QAM; 2048-QAM; 4096-QAM; 4096QAM; IQ Modulation; Qam
(QAM) A method for encoding digital data in an analog signal
in which each combination of phase and amplitude represents
one of sixteen four bit patterns. This is required for fax
transmission at 9600 bits per second.
(1995-02-02)
QAM
FAMILY OF DIGITAL MODULATON METHODS OF TELEVISION SIGNALS
QAM-modulated; Quadrature Amplitude Modulation; QAM; 256QAM; 256-QAM; 16-QAM; 16QAM; 64-QAM; 64QAM; 2-QAM; 2QAM; 4-QAM; 4QAM; 8-QAM; 8QAM; 32QAM; 32-QAM; 128-QAM; 128QAM; 512-QAM; 512QAM; 1024QAM; 1024-QAM; 2048QAM; 2048-QAM; 4096-QAM; 4096QAM; IQ Modulation; Qam
Quadrature Amplitude Modulation (Reference: HiperLAN/2, 802.11a)
QAM
FAMILY OF DIGITAL MODULATON METHODS OF TELEVISION SIGNALS
QAM-modulated; Quadrature Amplitude Modulation; QAM; 256QAM; 256-QAM; 16-QAM; 16QAM; 64-QAM; 64QAM; 2-QAM; 2QAM; 4-QAM; 4QAM; 8-QAM; 8QAM; 32QAM; 32-QAM; 128-QAM; 128QAM; 512-QAM; 512QAM; 1024QAM; 1024-QAM; 2048QAM; 2048-QAM; 4096-QAM; 4096QAM; IQ Modulation; Qam
DSBAM
IN AMPLITUDE MODULATION, THE AMPLITUDE (SIGNAL STRENGTH) OF THE CARRIER WAVE IS VARIED IN PROPORTION TO THE WAVEFORM BEING TRANSMITTED
Amplitude Modulation; Amplitude modulated; Double-sideband reduced carrier; Amplitude modulator; Amplitude-modulation detector; Amplitude-modulation radio; Amplitude-modulation; Amplitude Based; DSBAM; Clamp tube modulation; Heising modulation; Amplitude Modulated
Double-SideBand Amplitude Module
Amplitude Modulation
IN AMPLITUDE MODULATION, THE AMPLITUDE (SIGNAL STRENGTH) OF THE CARRIER WAVE IS VARIED IN PROPORTION TO THE WAVEFORM BEING TRANSMITTED
Amplitude Modulation; Amplitude modulated; Double-sideband reduced carrier; Amplitude modulator; Amplitude-modulation detector; Amplitude-modulation radio; Amplitude-modulation; Amplitude Based; DSBAM; Clamp tube modulation; Heising modulation; Amplitude Modulated
<communications> (AM) A method of encoding data by varying
the amplitude of a constant frequency carrier.
Contrast Frequency Modulation.
(2001-04-30)
Amplitude modulation
IN AMPLITUDE MODULATION, THE AMPLITUDE (SIGNAL STRENGTH) OF THE CARRIER WAVE IS VARIED IN PROPORTION TO THE WAVEFORM BEING TRANSMITTED
Amplitude Modulation; Amplitude modulated; Double-sideband reduced carrier; Amplitude modulator; Amplitude-modulation detector; Amplitude-modulation radio; Amplitude-modulation; Amplitude Based; DSBAM; Clamp tube modulation; Heising modulation; Amplitude Modulated
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal.
amplitude modulation
IN AMPLITUDE MODULATION, THE AMPLITUDE (SIGNAL STRENGTH) OF THE CARRIER WAVE IS VARIED IN PROPORTION TO THE WAVEFORM BEING TRANSMITTED
Amplitude Modulation; Amplitude modulated; Double-sideband reduced carrier; Amplitude modulator; Amplitude-modulation detector; Amplitude-modulation radio; Amplitude-modulation; Amplitude Based; DSBAM; Clamp tube modulation; Heising modulation; Amplitude Modulated
¦ noun the modulation of a wave by varying its amplitude, used especially as a means of broadcasting an audio signal by combining it with a radio carrier wave.
Carrierless amplitude phase modulation
Carrierless amplitude phase modulation (CAP) is a variant of quadrature amplitude modulation (QAM). Instead of modulating the amplitude of two carrier waves, CAP generates a QAM signal by combining two PAM signals filtered through two filters designed so that their impulse responses form a Hilbert pair.
Modulation
![[[Waterfall plot]] of a 146.52 MHz radio carrier, with amplitude modulation by a 1,000 Hz sinusoid. Two strong sidebands at + and - 1 kHz from the carrier frequency are shown.](https://commons.wikimedia.org/wiki/Special:FilePath/Waterfall AM.jpg?width=200 "[[Waterfall plot]] of a 146.52 MHz radio carrier, with amplitude modulation by a 1,000 Hz sinusoid. Two strong sidebands at + and - 1 kHz from the carrier frequency are shown.")
![A carrier, frequency modulated by a 1,000 Hz sinusoid. The [[modulation index]] has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.](https://commons.wikimedia.org/wiki/Special:FilePath/Waterfall FM.jpg?width=200 "A carrier, frequency modulated by a 1,000 Hz sinusoid. The [[modulation index]] has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.")
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer.
