Digital Audio and Digital Image

It might seem strange to think about seeing what you hear a bit like smelling what you see on tv with some kind of smellovision 🙂

but looking at the relationship between the two we can understand their properties.

Sample Rate 

 samples per unit of time  taken from a continuous signal to make a signal. The unit for sampling rate is hertz  (samples per second). The inverse of the sampling frequency is the sampling period or sampling interval, which is the time between samples. In digital audio the most common sampling rates are 44.1 kHz, 48 kHz, 96 kHz and 192 kHz

For Compact Disc and other consumer uses, 32 kHz for transmission-related application.

This can be compared with Image Resolution the higher the amount of pixels the clearer the image. For print the resolution should be 72 pixels per inch whereas for print it should at 300 pixels per inch.


Bit Depth describes the number of bits of information recorded for each sample. Bit depth directly corresponds to the resolution of each sample in a set of digital audio data. Common examples of bit depth include CD quality audio, which is recorded at 16 bits, and DVD-Audio, which can support up to 24-bit audio. the lower the bit depth the lower the quality of the sound. Bit depth is similar to pixels in images the lower the amount of pixels in the image the pooer the quality will be.

Number of channels  refers to stereo, mono or multitracks  Stereo uses two channels where as Mono uses one channel.  The number of channels is similar to colour in images.   Stereo may mean the image has colour and mono may mean that the image is seen only in black and white.

Audio compression

this helps to make file sizes smaller while still retaining the quality of the audio. It make it faster to email, save and work with smaller file sizes. Similarily compressing images makes them easier to upload to the web, open in programms, work with and email.

Digital imaages and Digital audio are so similar its easy to learn about one from the other. Handy for us 🙂


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