Sampling rate
The sample rate is an index for converting analog data such as speech into a digital signal and indicates how many times a sample of information is measured per second.
The unit is Hertz (Hz). Also called “sample rate” or “sample rate.” In most security cameras and surveillance camera systems, recording is done using the linear PCM method. The quality of recorded audio is highly dependent on the sample rate (Hz) and bit rate (bps / bit), but the amount of data is overwhelmingly less than that of motion pictures, so if you are concerned about the balance between quality and quantity of data It can be said that there is no such thing.
On the other hand, the standard for general music CDs was decided in the early 1980s, and the sample rate is 44.1 kHz and the bit depth is 16 bits. In other words, 1,411,200 bits of information are recorded per second. If this is converted to 60 minutes, it will be converted to 5,080,320,000 bit data ≒ 635 MB (megabytes). This is called uncompressed linear PCM recording, but of course the data capacity is too large in the uncompressed state, so when recording with a security camera or surveillance camera, this data is compressed and they record. The amount of data is compressed to approximately 1/10 to 1/30 by processing such as lossy compression that removes data that is outside the human audible range.
