Analog and Digital Signals

Music started with analog technology systems and then slowly transferred to digital. Today’s music industry has a combination of both. Nowadays, producers record music using analog gear and then render it to a digital format for mixing, mastering, and delivery. This article will discuss what these terms mean and how they differ.

What Are Analog Signals?

Analog is a time-varying quantity for which the time-varying variable represents some other time-varying quantity. In other words, Analog signals are time-varying quantities that represent some information. In electronics, the amount that varies over time is ‘Voltage.’ They are nothing but continuously changing representations of a continuously variable quantity. These signals are passed between devices to receive or give information. It can be video, audio, or any other kind of encoded data. The critical thing to consider here is that these signals are continuous. An example of a number line can easily explain this concept. If we take two numbers on a number line, say 3 and 4, there are infinite possibilities between these two numbers. This is what analog represents.  

What Are Digital Signals?

It is an electrical signal comprising a discrete set of waveforms of a physical quantity to represent a sequence of discrete values. Digital signals are discrete (not continuous). No matter how small the intervals between these values are, they are never ‘0. Even the highest sample rate can be put into a number figure. These signals can also receive or transmit different information, including audio, video, etc. A simple example of a number line can explain the non-continuity of these signals. Consider two numbers on a number line, say 3 and 4. Theoretically, there are infinite numbers of possibilities between these two numbers. Due to the very nature of a digital signal, only finite numbers can be represented. Hence, no matter how high-quality the digital signal is, we will always get a discrete set of values.  

Analog vs Digital

The difference between the two is like seeing a video on a camera screen in real life. Seeing things move on a camera is an illusion because the video is not continuous. It seems continuous because the large number of frames per second tricks our brain into thinking it is a video. On the other hand, when we see the same thing in reality, everything is continuous. The real thing is like an Analog signal, while the illusion created using the camera is comparable to the digital signal. In the recording world, digital is much cheaper than analog. Analog sounds warmer and more natural, while digital sounds crispier and cleaner.

With digital technology becoming high quality, people have debated which is better. There are merits and demerits of both, and hence, both are being used in today’s world. It is up to you what to use and how to get the best out of what you have.