Because of this, it is better to write a single stream of data to the card rather than 32 streams of data to 32 different wave files. SD cards are limited to a 4-wire data bus, so the amount of read/writes that can happen at any given moment are limited. I have already heard this question, “Why a single file with 32 channels, it would be so much easier to be 32 different channels.” This can be useful when seeking to a particular sample frame in the file. The block align field in the format chunk gives the size in bytes of each sample frame.
In a 5-channel file, a sample frame has 5 samples. In a stereo file, a sample frame has 2 samples (one for the left channel, one for the right channel). In a monophonic file, a sample frame will consist on 1 sample. That is, a sample frame will contain one sample for each channel. The samples for all channels at a moment in time are called a sample frame (also called a block). That is, in a stereo file, one sample for the left channel will be followed by one sample for the right channel, followed by another sample for the left channel, then right channel, and so forth. Samples in a multi-channel PCM wave file are interleaved. If you want to learn some really interesting information about the Wave Format, there is an amazing page that you can read about it! Check it out here: LINK.Īn interesting tidbit that I found on the page linked above, was how the samples are saved with a multi-channel file: The 32-bit PCM multi-channel wav file is encoded as it was a surround sound file, however instead of a 6 channel 5.1 surround sound audio stream, the X-Live has a 32 channel audio stream. The X-Live card will then add data into a log to swap over to the additional file at the right time and does this seamlessly during playback. Due to this limitation, at 11.7 minutes it will create an additional file. This is because of its use of a 32-bit unsigned integer to record the file size header. This is also the same for the WAV format itself. The maximum possible size for a file in a FAT32 format is 4 GiB minus 1 byte or 4,294,967,295 bytes. If you are wondering what PCM stands for, it stands for Pulse-Code Modulation. The Behringer X-Live card records a 32-Bit PCM multi-channel WAV file.
X-Live Records 32-Bit PCM multi-channel WAV Since posting, I have been getting a common question over the last week, “how does the X-Live card record the audio?” or “how does the X-Live card handle the files?” So I wanted to put all of my thoughts and data about that here.
This is a dual SD and USB input/output card which you can record to both the USB side AND the SD side at the same time. Last week, I posted my first blog post on the Behringer X-Live expansion card.
0 kommentar(er)
