Audio bit depth, sample rate, and bit rate
About the sample rate. What is the most intuitive effect of sample rate?
Affects the expressiveness of the sound’s frequency range. The higher the sample rate, the larger the frequency range that can be expressed. 44.1KHz sampling rate can represent the frequency range from 0Hz to 22050Hz; 48KHz sampling rate can represent the frequency range from 0Hz to 24000Hz; 96 KHz sample rate can represent the frequency range from 0 Hz to 48000 Hz. The average frequency range that the human ear can hear is approximately 20 Hz-20,000 Hz. Combining the above two, if you see one parameter: 16Bit 44.1KHz , it means this digital audio can express “96dB dynamic range” and “0 Hz -22050 Hz” frequency range; 24Bit 48KHz , it means this digital audio can Performance ” 144dB Dynamic Range ” and ” 0Hz -24000 ”
Hertz” frequency range. (3) Audio bit rate, also called bit rate, or bit rate. Bit rate refers to the amount of information that can pass through a data stream per second, which can also be understood as: how much is used per second The amount of data in bits to represent In principle, the higher the audio bitrate, the better the quality However, if it is lossy compressed audio , different compression algorithms, even if the bitrate is the same, will lead to completely different sound quality results.Typical representative: 96kbpsThe sound quality of WMA audio format is obviously better than that of MP3 audio format than 96 kbps. Why is this? The difference is due to different compression algorithms and different data utilization rates. Another example, if the MP3 is compressed below 48 kbps, it’s already terrible. And if it’s format AAC audio, to the same 48kbps bit rate, the sound quality is obviously better than MP3. For lossless compressed audio, even if the bitrate is completely different, the final sound quality is the same
. For example, if the same WAV file is compressed in FLAC and APE formats, the bit rate of the output file is not the same, but the sound quality is the same. Even if it is the same format, the compression level is different and the bitrate is completely different, but the end result, the sound quality remains the same (but when encoding and decoding, the CPU usage is different and the encoding time is also different).
