What is sample rate

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What is digital audio? What is an audio sample? What is an audio sample rate? Why is the standard audio sample rate Other audio sample rates: 48 kHz, Can you hear the difference between audio sample rates? Is a higher audio sample rate better?

What is audio bit depth? Systems of higher audio bit depths are able to express more possible values: bit: 65, values bit: 16,, values bit: 4,,, values With a higher audio bit depth—and therefore a higher resolution—more amplitude values are available for us to record.

Can you hear the difference between audio bit depths? For more information on audio bit depth, be sure to check out the video below. Learn more audio fundamentals:. Read More. We make innovative audio products that inspire and enable people to be creative. Useful Links. Top Products. Learn More About. Subscribe to our newsletter. Follow us. All rights reserved. Terms of Use. Privacy Policy. Do Not Sell My Information. License Agreement. More technically, the bit depth of a pixel indicates how many distinct colors can be represented in the pixel.

Tying the sampling rate and the sample depth together is the bit rate, which is simply the product of both. The bit rate in audio varies according to application. All in all, what does compression really mean, then, when it comes to audio?

Compressed audio formats, such as AAC or MP3 have a bit rate that is some smaller number than the true product of the sampling rate and the sample depth. The formats achieve this by having information "surgically" removed from the bit stream on perceptual grounds, which means that in dynamic contexts those frequencies or amplitudes which are not heard by the human ear for biological reasons are not stored, leading to an overall smaller file size.

Ragy Morkos is a software engineer, embedded with the research staff at Voci. He develops web demonstrations of emerging and future speech technologies, builds automated verification infrastructure and test cases, and authors data preparation tools that interface with Voci's existing product line.

His responsibilities also extend into the machine learning realm, where he is working on turn-taking analysis and age identification from speech. Ragy Morkos January 17, For example, if an audio signal has an upper limit of 20, Hz the approximate upper limit of human hearing , a sampling frequency greater than 40, Hz 40 kHz will avoid aliasing and allow theoretically perfect reconstruction.

Many authorities in the preservation of sound recordings, like the International Association of Sound and Audiovisual Archives IASA , recommend sampling rates that encode audio outside range of human hearing range, i. The net effect of higher sampling rate and conversion technology improves the audio quality within the ideal range of human hearing.