What are Encoding, Codec, Bitrate, Sample Rate Part 2
Bit rate / Sampling rate
Bit rate :
the amount of data processed per unit of time, which is used to indicate how much information can be processed and sent/received per second, such as
kbps.
Sampling rate (sampling rate/sampling frequency) :
represents the amount of sample data (frequency/frequency of occurrence?) per unit of time when converting a digital signal to an analog signal.
・ 44.1kHz or 48kHz
That’s how it is …
Fountain
Bit per second (bit per second) is a unit of data transfer rate (bit rate in JIS information processing terminology). It is defined as the number of bits that have passed (ie transferred) a virtual or physical point in the data transfer path per second.
▶ ︎ https://ja.wikipedia.org/wiki/ Bits per second
Sampling rate (sample rate) is sampling, which is a process necessary to convert analog waveforms, such as voice, into digital data, and is the sampling rate per unit of time. The commonly used unit is Hz.
Also called sample rate or sample rate.
▶ ︎ https://ja.wikipedia.org/wiki/Sampling rate
❤︎3, what is the standard file format?
This will come in handy when creating your own data, so it’s worth knowing.
*
If it’s a CD, even if you create a larger file with a 44.1 kHz
* iTunes is a
AAC file format with a
256 kbps bit rate
sample rate
5~10MB
It’s standard…
So the sample size (number of bits) is not shown in the compressed file, so there is no comparison by the number of bits, but it seems that Wav files and CD sound sources have a quality sound superior to compressed files.
It is easy to understand when compared to the bitrate on the WAV file side.
* iTunes sound source purchase file example
hello Adele
Hello Adele
Bit rate: 256 kbps Sampling frequency: 44.1
kHz
CCA
9.8MB
Sia-Viva
Sia Alive
Bit rate: 256 kbps Sampling frequency: 44.1
kHz
CCA
8.9MB
Spicy Red Chili Getaway
Red Hot Chili Getaway Rate
bits: 256kbps
Sampling frequency: 44.1 kHz
CCA
8.4MB
Original WAV-min file
By the way, the one I created uncompressed with Protools from the original sound source file is the one shown in
next figure.
adela hello mp3
Bit rate: 2304kbps
Sample size: 24 bits Sampling rate: 48
kHz
WAV
63.7MB
Also, when I encoded Adele Hello to MP3 with iTunes,
bit rate: 256 kbps → 160 kbps Sampling rate: 44.1
kHz
AAC → MP3
9.8MB → 5.9MB
.
So I feel like MP3, 160kbps and 44.1kHz are the breaking lines where the deterioration isn’t as noticeable.
WAV files are a backup instead of a listen
Typically, bit rate: 256 kbps, sample rate: 44.1 kHz, AAC is more than enough.
