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DVD optical discs can be divided into two categories: pre-recorded optical discs and recordable optical discs; pre-recorded optical discs have DVD-ROM, DVD-Video, DVD-Audio and other formats; recordable optical discs are divided into two types: write-once and erasable, DVD-R and DVD+R, erasable, DVD-RAM, DVD-RW and so on.

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

I. pre-recorded optical discs

Pre-recorded CD-ROMs, also known as CD-ROMs, are available 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 foundation of DVD-Video and DVD-Audio.

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

(1) 16,20,24 bit quantization is available.

(2) the sampling frequency can be selected as 48 kHz, 96 kHz, 192 kHz and 44.1, 88.2 kHz.

(3) 2 channels or multiple channels can be selected, and there can be up to 6 channels.

If we choose the highest quantization 24bit, the highest sampling frequency 192kHz, and record 2-channel stereo programs, then a DVD-5 CD can store 64 minutes of such high-quality audio programs. CD-DA is 16bit 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 use Dolby Digital and DTS specifications.

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

DVD-Audio cannot be played on PC. If you want to replay on PC, you need to install the DVD-Audio decoder.

2. Recordable optical discs

Recordable discs can be divided into two types: write-once and erasable.

There are DVD-R and DVD+R for writing at one time.

The erasability includes DVD-RAM, DVD-RW and DVD+RW.

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

DVD+R and DVD+RW are formats developed by the DVD consortium.

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