compression ratio NISSAN SENTRA 2021 Owners Manual

Static: Caused by thunderstorms, electrical
power lines, electric signs and even traffic
lights.
AUDIO OPERATION PRECAUTIONS
MP3 or WMA terms
• MP3 — MP3 is short for Moving PicturesExperts Group Audio Layer 3. MP3 is the
most well-known compressed digital au-
dio file format. This format allows for near
“CD quality” sound, but at a fraction of the
size of normal audio files. MP3 conversion
of an audio track from CD-ROM can re-
duce the file size by approximately a 10:1
ratio with virtually no perceptible loss in
quality. MP3 compression removes the
redundant and irrelevant parts of a
sound signal that the human ear doesn’t
hear.
• WMA — Windows Media Audio (WMA)* is a compressed audio format created by Mi-
crosof t as an alternative to MP3. The WMA
codec offers greater file compression
than the MP3 codec, enabling storage of
more digital audio tracks in the same
amount of space when compared to
MP3s at the same level of quality. • Bit rate — Bit rate denotes the number of
bits per second used by a digital music
file. The size and quality of a compressed
digital audio file is determined by the bit
rate used when encoding the file.
• Sampling frequency — Sampling fre- quency is the rate at which the samples
of a signal are converted from analog to
digital (A/D conversion) per second.
• Multisession — Multisession is one of the methods for writing data to media. Writ-
ing data once to the media is called a
single session, and writing more than
once is called a multisession.
• ID3/WMA Tag — The ID3/WMA tag is the part of the encoded MP3 or WMA file that
contains information about the digital
music file such as song title, artist, encod-
ing bit rate, track time duration, etc. ID3
tag information is displayed on the Artist/
song title line on the display.
* Windows® and Windows Media® are reg-
istered trademarks and trademarks in the
United States of America and other coun-
tries of Microsof t Corporation of the USA.
USB (Universal Serial Bus)
Connection Port
CAUTION
• Do not force the USB device into the
USB port. Inserting the USB device
tilted or up-side-down into the port
may damage the port. Make sure
that the USB device is connected cor-
rectly into the USB port.
• Do not grab the USB port cover (if so
equipped) when pulling the USB de-
vice out of the port. This could dam-
age the port and the cover.
• Do not leave the USB cable in a place
where it can be pulled unintention-
ally. Pulling the cable may damage
the port.
4-46Monitor, climate, audio, phone and voice recognition systems