DVD-ROMs allow for the distribution of movies and software, storing data for reading like CD-ROMs but with greater storage. MP3s compress audio files without significant quality loss using human hearing psychology. Wi-Fi enables wireless connections between devices like routers and MP3 players, allowing transfer of files like music over home networks. PVRs store TV programs on a hard drive so users can watch them later or download scheduled programs automatically in the future.

1. Week14
About DVD-ROM
●
About MP3
●
About Wi-Fi
●
About PVR
●

2. About DVD-ROM
With DVD for exclusive use of the reading,it is the
CD-ROM saying with a CD.
Distribution or a movie of software for computer are
used for the distribution of the picture work.

3. About MP3
The MP3 was developed as an audio system standard of
MPEG-1 which was a video compression standard. It is
irreversible compression and hits MP1 which is a standard
before it and the thing which improved MP2. The MP3 can
compress sound data without being accompanied with the
deterioration of extreme sound quality.
The compression quality is big, and the MP3 changes
depending on the implementation of the encoder to perform the
compression that used the human hearing psychology such as
the phenomena that are hard to come to hear the direct back
and a small sound of near frequency just before that when the
difference of the easiness of hearing of the sound by the
frequency and a big sound sounded.

4. About Wi-Fi
WiFi is a trademark for the wireless connection,
router, and gadget using wifi technology
WiFi connection is a hub for the information on the
home entertainment system.
In the future, we will able to download and listen to
the music with only MP3 player, without PC.
Also we will able to listen to the music at our car.
Then that music file will be transferred by WiFi
connection.

5. About PVR
Personal Video Recorder, PVR, stores TV
programs so you can watch them later. These
programs are stored on HDD.
In the nearly future, PVR will download the TV
program information from the Internet and store the
scheduled programs automatically.

6. References
FOTOSEARCH
●
http://www.fotosearch.jp