Meaning and relationship of sample rate, bit depth, and bit rate
Sampling rate
Bit depth
Bit rate
I will present the three meanings and relationships of.
Table of Contents
What is the sampling rate?
What is bit depth?
What is a bit rate?
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What is the sampling rate?
For example, let’s say you say “Ah” for 1 second.
When recording this “Ah” sound on a personal computer, the “Ah” sound is divided into tens of thousands per second, each divided into tens of thousands.
“The height of this section was about this.”
“The length of this section was about this.”
Record it as data like this.
The personal computer continually reads each of this divided data and outputs it as a “voice” called “Ah”.
At this time, “how many tens of thousands of sounds are collected per second” is called the “sample rate.” (Also called “sample rate”)
Sampling rate
▲ Sample rate image
The more divisions you make, the smoother the sound will be, and as a result, you will feel that the sound quality has improved!
What is bit depth?
The sample rate is “how many tens of thousands of sounds are collected per second”.
“How much capacity is given to each divided data (sample)” is called “bit depth”.
Figure_bit depth
▲ Bit depth image
Also called “number of quantization bits”, “number of sample bits”, “bit offset”, and so on.
For example, if the bit depth is “16 bits”, the amount of information is 2 to the 16th power (65536) for one sample.
The higher the bit depth, the greater the expressiveness of the sound’s fineness and volume, and as a result, I feel like the sound quality has improved!
By the way, the bit depth of most of the world’s sound sources is 16 bit.
that’s why
“Import music from CD!”
“Import music downloaded from the Internet!”
In such cases, 16 bits is sufficient.
On the other hand, if you say “What you recorded in your DAW comes out wav!”, It is better to have 16 bits or more.
This is because, for example, when processing audio effects with audio editing software, sound deterioration can be reduced to zero by assigning an additional bit depth (for example, 32-bit). (Although 16 bit is fine for final output)
What’s more,
note that “bit depth” on this page has a different meaning than “bit depth” in video.
Reference: What is Bit Depth (Color Depth)? Differences like 10bit / 24bit / 30bit
What is a bit rate?
Bit rate is the “amount of data per second”.
Reference: What is a bit rate? Relationship between image quality, sound quality and codec [Video / Audio]
The “sample rate” and “bit depth” presented above are
Sample rate: how many tens of thousands of sounds are collected per second
Bit depth: how much to give to each divided data
Therefore, the product of these two values is the “bit rate”.
