What are the categories of DVD discs?

DVD discs can be divided into two categories: pre-recorded discs and recordable discs; pre-recorded discs include DVD-ROM, DVD-Video, DVD-Audio and other formats; recordable discs are further divided into There are two types: write-once and rewritable. The write-once type includes DVD-R and DVD R, and the rewritable type includes DVD-RAM, DVD-RW, etc.

DVD discs can be divided into two categories: pre-recorded discs and recordable discs.

1. Pre-recorded discs

Pre-recorded discs are also called read-only discs and come in three formats: DVD-ROM, DVD-Video, and DVD-Audio. .

1. DVD-ROM

DVD-ROM format is the most basic format in the DVD family. It is the basis of DVD-Video and DVD-Audio.

DVD-ROM is a data optical disc, its capacity is 7 times that of CD-ROM, and its data transfer rate is 9 times that of CD-ROM. It is widely used in the computer field. The file system of DVD-ROM adopts UDF and ISO9660 standards and is compatible with the computer operating system. It is widely used in data access, multimedia, and computer games.

2. DVD-Video

DVD-Video, commonly known as DVD, is the video format of DVD. We will introduce it in detail in the next article.

3. DVD-Audio

The specification of DVD-Audio is the DVD audio format.

(1) 16, 20, 24 bit quantization can be selected;

(2) 48/96/192 kHz and 44.1/88.2/176.4 kHz sampling frequencies can be selected;

(3) You can choose 2 channels or multiple channels, up to 6 channels.

If we choose the highest quantization of 24bit, the highest sampling frequency of 192kHz, and record a 2-channel stereo program, then a DVD-5 disc can store 64 minutes of such high-quality audio programs. CD-DA is 16-bit quantization, 44.1kHz sampling, and its data volume is only 15% of DVD-Audio.

The LPCM used by DVD-Audio is an uncompressed reproduction of the original sound. It can also adopt Dolby Digital, DTS specifications.

DVD-Audio can reach 144db, while the dynamic range of CD is 120db.

DVD Audio needs to be played on a dedicated DVD-Audio player or a DVD player that is compatible with DVD-Audio. DVD-Audio cannot be played on PC. If you want to play back on PC, you need to install a DVD-Audio decoder.

2. Recordable optical discs

Recordable optical discs are divided into two types: write-once and rewritable.

The write-once types include DVD-R and DVD R.

The rewritability options include DVD-RAM, DVD-RW, and DVD RW.

DVD-R, DVD-RW and DVD-RAM are formats developed by the DVD Forum.

DVD R and DVD RW are formats developed by the DVD Alliance.

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