Sharp FO-475TH - Manual (Page 48)

UX-258TH
FO-475TH
(4) Modem (R96V24) block
INTRODUCTION
The Rockwell R96V24 MONOFAX ® facsimile modem family provides
9600 bps half-duplex capability with options supporting DigiTalk™ voice
and ADPCM audio codecs, DigiTalk™ full-duplex speakerphone, and
V.23 full-duplex. The modem models are identified in Table.
These functions are supplied in a single VLSI device or two-device set
(for speakerphone). The MDP (modem data pump) is packaged in a
100-pin PQFP. The MDP contains an internal integrated analog codec
(IIA) and is pin-compatible with the R96V24 MONOFAX modems.
This device family enables cost-effective development of a common fac-
simile machine design with digital answering machine and/or full-duplex
speakerphone.
The modem can operate at 9600, 7200, 4800, 2400, or 300 bps, and
can perform HDLC framing per T.30 at all rates. A programmable DTMF
detector, three programmable tone detectors, and Caller ID demodulator
are provided.
The DigiTalk™ V24 voice coder/decoder (codec) compresses voice at
an average rate of 2.9 kbps or at a fixed rate of 4.7 kbps with near toll
quality playback. An average rate of 2.9 kbps provides 24 minutes of
stored voice messages in 4 Mbits of memory. This voice codec allows
the host controller to efficiently store and playback digital incoming mes-
sages (ICMs) and outgoing messages (OGMs).
The ADPCM audio codec compresses audio signals (e.g., music/voice)
at 32 kbps or 24 kbps for highest fidelity coding and reproduction.
Selectable error correction coding allows storage in audio grade RAMs
(ARAMs). Echo cancellation techniques employed during playback al-
low DTMF and tone detection during voice/audio codec operation to
support user selectable features. The coder can record messages from
either the IIA or XIA. Dual/single tone transmission is available when the
decoder is disabled.
FEATURES
• Group 3 facsimile transmission/reception
– ITU-T V.29, V.27 ter, T.30, V.21 Channel 2, T.4
– HDLC framing at all speeds
– Receive dynamic range: 0 dBm to –43 dBm
– Automatic adaptive equalization
– Fixed and programmable digital compromise equalization
• V.27 ter short train
• V.21 channel 2
– DTMF detect and tone detect
• Caller ID reception
– Compromise equalizer
• DigiTalk™ voice codec
– 24 minutes of voice storage per 4 Mbit memory
– Near toll quality voice recording and playback
– Programmable AGCs
– Error correction coding allows ARAM usage
– DTMF detect, tone detect, and tone transmit
– Pitch synchronized fast and slow playback
– Near-end echo cancellation
• ADPCM audio codec
– High fidelity recording and playback of audio signals
– 32 kbps and 24 kbps
– Programmable AGC
– DTMF detect, tone detect, and tone transmit
– Near-end echo cancellation
• 8-bit or 16-bit high quality audio mode transmission/reception
5 – 6