Sharp UX-258TH, FO-475TH manual Modem R96V24 block, Introduction

(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.

UX-258TH

FO-475TH

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

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