digital modulation वाक्य
उदाहरण वाक्य
मोबाइल
- Two-way radio systems using digital modulation schemes such as TDMA can embed unit ID and selective calling into the data stream multiplexed in parallel with the voice.
- These encoders can be placed before for binary data source, but have been placed after to illustrate the conceptual difference between digital and analog signals involved with digital modulation.
- In practice, however, digital modulation protocols are much more susceptible to multipath interference and fail to provide service in areas where analogue FM would otherwise provide degraded but audible voice service.
- For digital modulation schemes it has been shown that for properly implemented on-off keying / amplitude-shift keying systems, rejection can be better than for frequency-shift keying systems.
- An "'M-ary transmission "'is a type of digital modulation where instead of transmitting one bit at a time, two or more bits are transmitted simultaneously.
- Weightless-N is designed around a differential binary phase shift keying ( DBPSK ) digital modulation scheme to transmit within narrow frequency bands using a frequency hopping algorithm for interference mitigation and enhanced security.
- Link spectral efficiency is typically used to analyse the efficiency of a digital modulation method or line code, sometimes in combination with a forward error correction ( FEC ) code and other physical layer overhead.
- The system employs digital modulation formats, transmission of information and signal compression, Making it possible to place in the frequency range of a single analog channel, several digital channels with much higher quality.
- Analog and digital modulation facilitate frequency division multiplexing ( FDM ), where several low pass information signals are transferred simultaneously over the same shared physical medium, using separate passband channels ( several different carrier frequencies ).
- In the first case, a signal that is generated by means of a digital modulation method is considered as converted to an analog signal, while it is considered as a digital signal in the second case.
- The simplest forms of digital modulation are of second order because they can transmit only two symbols ( usually denoted as " 0 " and " 1 " or as "-1 " and " 1 " ).
- Generally, higher bit rate transmissions require a wider frequency band, though the ratio of bit rate to symbol rate and thus to bandwidth are not linear due to significant innovations in digital signal processing and digital modulation methods.
- In a digital modulation method provided by a modem, each symbol is typically a sine wave tone with certain frequency, amplitude and phase . Symbol rate, baud rate, is the number of transmitted tones per second.
- The messages are either represented by a sequence of pulses by means of a line code ( baseband transmission ), or by a limited set of continuously varying wave forms ( passband transmission ), using a digital modulation method.
- "' Orthogonal Frequency-Division Multiple Access "'( "'OFDMA "') is a multi-user version of the popular orthogonal frequency-division multiplexing ( OFDM ) digital modulation scheme.
- Some textbooks also consider passband data transmission using a digital modulation method such as ASK, PSK and QAM, i . e . a sinewave modulated by a digital bit-stream, as analog transmission and as an analog signal.
- As in many digital modulation schemes, the constellation diagram is useful for QAM . In QAM, the constellation points are usually arranged in a square grid with equal vertical and horizontal spacing, although other configurations are possible ( e . g.
- A digital modulation method ( or passband transmission scheme ) using 2 " N " different symbols, for example 2 " N " amplitudes, phases or frequencies, can transfer " N " bit / symbol.
- The aim of "'digital modulation "'is to transfer a channel, for example over the public switched telephone network ( where a bandpass filter limits the frequency range to 300 3400 Hz ) or over a limited radio frequency band.
- Classic Bluetooth also uses frequency hopping but the details are different; as a result, while both FCC and ETSI classify Bluetooth technology as an FHSS scheme, Bluetooth Smart is classified as a system using digital modulation techniques or a direct-sequence spread spectrum.
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