# Digital Electronics - Digital Concepts - Discussion

Discussion Forum : Digital Concepts - General Questions (Q.No. 6)
6.
What is a digital-to-analog converter?
It takes the digital information from an audio CD and converts it to a usable form.
It allows the use of cheaper analog techniques, which are always simpler.
It stores digital data on a hard drive.
It converts direct current to alternating current.
Explanation:
A DAC converts an abstract finite-precision number (usually a fixed-point binary number) into a concrete physical quantity (e.g., a voltage or a pressure).
Discussion:
9 comments Page 1 of 1.

There are two basic type of converters, digital-to-analog (DACs or D/As) and analog-todigital
(ADCs or A/Ds). Their purpose is fairly straightforward. In the case of DACs,
they output an analog voltage that is a proportion of a reference voltage, the proportion
based on the digital word applied. In the case of the ADC, a digital representation of the
analog voltage that is applied to the ADCs input is outputted, the representation
proportional to a reference voltage.

The digital signals comprised of 1s and 0s organised in the form of groups called words (eg:1001010101010000-16bit word). Digital words that represent numbers, music, word documents are used by internal circuitary of mp3players, calculators, pc. For eg how DAC is used in mp3 player. Music stored in digital format convert it into analog format in headset. (input-binary (1111) 2 to decimal form (15) 10.

The digital information can be stored in various media other than audio CD's. When you need an analog output i.e. an output that is not expressed in 0's & 1's, you need something that converts digital input to analog data. Hence, DAC is used. Option A is at the most, the most logical option, not necessarily the correct one.

In this que, the information stored in CD is in digital form. DAC converts this information into usable form.

Sekhar said:   6 years ago
In hard drive, the data are stored in analog form are digital form?
(1)

Vishal Srivastav said:   1 decade ago
DAC converts the digital pulses into continuous (analog) form.