Inter-M CDR-01 - Manual (Page 6)

SD RECORDER/MULTI SOURCE PLAYER
4 CDR-01
Additional Descriptions Additional Descriptions
- MP3 (MPEG AUDIO LAYER-3)
MP3 is a type of MPEG as audio, video compression standards.
MP3 is one of music file formats that can contain stereo sound quality as good as audio CD. Compression rate
is 1MB by 1, and about 3~5MB are sufficient if recording a music of 3~5 minutes or so. Different from audio
CD, MP3 can contain over 130 tracks for popular songs or folk songs. One MP3 CD can play for about 10
hours. MP3 can compress the music to 1/12 in its size with maintaining the CD sound quality because mp3
removes the frequency range which human being can not discernible. If compress a CD of 50MB to MP3
format, then it is about 4~5MB maintaining CD sound quality.
- WMA (WINDOW MEDIA AUDIO)
WMA is a multimedia compression method developed by Microsoft Corporation and is technology compress
only music from ‘Window Media Technologies’. WMA can provide the same sound quality with the MP3 format
with a half file size compared to MP3. WMA file of 64kbps has the same audio sound quality with the MP3 of
128kbps.
- WAV (WAVEFORM AUDIO FORMAT)
WAV or WAVE stands for the waveform audio format. It is the standard format of audio playback in a
computer which is Microsoft or IBM. There are PCM, DM, DPCM, or ADPCM formats. PCM is non-compressed
audio format and is used to rip a CD with the same sound quality with the CD.
- DIGITAL OUTPUT AND STANDARDS
Audio signal is recorded in a CD with a digitalized signal. Usually digital audio signal is converted to analog
signal with a Digital-Analog Converter (DAC) in a player. Optical output delivers the digital audio signal with
optical signal. Coaxial output delivers the digital audio signal with digital data.
The digital interface used in Optical and coaxial output is S/PDIF (Sony/Philips Digital Interface) format which
complies with the standards called as IEC60958.
- RS-232C SERIAL INTERFACE
AMX or CRESTRON remote control system can be used with this RS-232C terminal.
The maximum cable length should be below 15m.
1. RS-232C Terminal
2. Remote control function
Play/Pause, Stop, Skip down/up, Search Down/up, etc can be controlled by a remote controller.
3. Downloading of the control protocol
You can download the protocol at the home page (www.inter-m.com)
Pin 1 2 3 4 5 6-9
Purpose X Receive Transmit X Ground X