Evaluating Digital and Analog Audio

When it comes to digital vs. analog audio, the initial reaction that some people might have is that digital is probably better since it is “newer” technology and that typically denotes improvements. While digital audio certainly does have perks and some aspects make it stronger for certain applications, the reality is that both digital and audio are equally useful and both can produce the same level of quality for users with the right equipment. For both processes, sound is typically picked up by some type of transducer (such as a microphone) and the signal is then recorded onto a form of storage media (records or magnetic tape for analog, compact discs or storage devices for digital). The process is very similar for both types of audio up until the sound is recorded, that is where the two formats diverge.

With analog audio, the sound signal is stored as a wave pattern in or on the media that directly translates the pattern of the initial sound waves. This can be the grooves cut into a vinyl record or the magnetic field strength variations on a magnetic strip encased in a cassette. The process is a straight representation of the original audio pattern and is then read by a record or cassette player which converts the pattern on the media back into a sound signal. When considering digital vs. analog audio you should keep in mind that the quality of the sound you hear is often determined more by the quality of the equipment you have for playback, as it is by the media itself. High quality analog equipment will produce a better sound than lower quality digital equipment, and vice versa.

Digital audio receives and analog signal and then uses an analog-to-digital converter (ADC) to convert the signal into a series of binary numbers, and that code is what is then placed onto a CD or storage device. A digital-to-analog converter (DAC) then takes those numbers and turns it back into an analog signal that is then sent to speakers and comes back out as the original sound. Digital audio is more resistant to small errors, as tiny flaws in analog media will be immediately noticed during playback, but can often have no impact on digital audio. However, larger flaws will still be discernable through analog audio, but can often make a piece of digital audio completely unplayable as the digital code is too damaged to be converted back to sound. Digital audio’s greatest strength, however, is that it is much more inexpensive to duplicate or record and the digital code can be directly placed into portable storage and playback devices. Ultimately, a consideration of digital vs. analog audio comes down to what a user can afford, and what the user intends to do with the audio.