What is the sample rate / sample rate?
Sampling rate
The sampling frequency is the number of sampling processes performed per second in an AD converter that converts an analog signal into a digital signal.
The unit is “Hz”, and the higher the value, the faster the analog input signal can be converted to a digital value, resulting in higher sound quality. However, the amount of data increases proportionally, so you must choose the correct frequency for media and devices with limited storage capacity.
It is said that to accurately record and reproduce a certain sound, it is necessary to sample at a frequency that is approximately twice the frequency of that sound. The sampling frequency used for music CDs is 44.1 kHz. In this case, the voice waveform is shredded 44,100 times per second and the voice information at each moment is converted into digital information.
Humans typically have 20Hz to individual differences, but they can perceive sounds between 15kHz and 20kHz as sound, and this frequency band is called the audible range.
Difference between sample rate and bit rate
Sample rate and bit rate are used to describe the sound quality before and after compression of the audio data.
The sampling rate is a value that represents “the number of sampling processes performed per second”.
For example, at the standard sample rate of 44.1 kHz, it means to sample 44100 times per second.
The higher this number, the softer the sound and the better the sound quality. In other words, the numerical value of the sample rate represents the quality of the sound.
On the other hand, the bit rate is a value that indicates “how many levels the volume is represented”.
For example, in the case of 16 bits, which is the standard bit rate, the amount of information is divided by 2 to the 16th power (= 65536 steps). If the number of bits is low, the sound quality will be grainy and, as with the sample rate, the higher the value of the bit rate, the more information that can be reproduced and the better the sound quality.
Sample rate bit rate
Sample rate bit rate
Divide the time axis to
44.1 kHz, divide 44100 per second Divide the amount of information vertically Into
In the 16-bit case, divide the amount of information by 2 to the 16th power
