Waves
With analog and digital signals.
An Electronic Device
Modulation
Information about a digital to analog converter can be found on the site Hardware Secrets which divulges that real world signals such as light and sound can be converted into digital signals by a circuit called ADC (Analog-to-digital converter) so that the information, once converted, can be processed and stored digitally.
A: The device is an IC chip called DAC for figital to analogue converter. they comes with many configuration of bits output.
A signal which repeats itself after a specific interval of time is called periodic signal. A signal which does not repeat itself after a specific interval of time is called aperiodic signal.A signals that repeats its pattern over a period is called periodic signal,A signal that does not repeats its pattern over a period is called aperiodic signal or non periodic.Both the Analog and Digital can be periodic or aperiodic. but in data communication periodic analog sigals and aperiodic digital signals are used.
Actually you have this backwards, the telephone lines can only carry analogue signals (voice band, 20Hz to 3KHz) not digital signals.The device that converts digital signals to analogue signals for transmission over telephone lines is called a phone MoDem(this stands for phone modulator demodulator). At the opposite end of the line it of course converts the telephone analogue signals back to digital signals.
A device which carries out the two important tasks of modulating and demodulating the analog signals is called a modem. The analog signals encode the digital information at the time of modulation and decodes it back during demodulation to transmit the data.
Mainly to free up radio frequency spectrum. An analog picture uses 4.5 megahertz for the video and sound and a satellite transponder is typically 8 Mhz. wide. With the new digital system, it's possible to transmit up to eight separate TV channels in the same bandwidth on the transponder using a system called, `multiplexing`.
The signal directly from the sensor is analog. It is than converted to digital, and a digital signal is used for processing. The signal directly from the sensor is analog. It is than converted to digital, and a digital signal is used for processing.
If you are referring to the traditional PSTN phone, the signals that it receives are analog. If you want to know about VOIP phone, it is digital in nature. However, analog can be converted to digital by using a device called ATA.
correlation is a technique of correlating two signals with each other and producing the third signal. In correlation if two different signals are used it is called cross correlation and if same signal is correlated with itself it is called as auto correlation.