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參數(shù)資料
| 型號： | L2702-12 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SmartACFL Modem |
| 中文描述： | SmartACFL調制解調器 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 210K |
| 代理商： | L2702-12 |
SmartACFL
V.90/K56flex Modem Device Sets with SmartDAA Technology for Low Power Applications
6
Conexant
Doc. No. 100444A
Proprietary Information
Voice/Speakerphone Mode (S Models)
S models include additional telephone handset,
external microphone, and external speaker
interfaces that support voice and full-duplex
speakerphone operation.
Hands-free full-duplex telephone operation is
supported in Speakerphone Mode under host
control. Speakerphone Mode features an advanced
proprietary speakerphone algorithm which supports
full-duplex voice conversation with acoustic, line, and
handset echo cancellation. Parameters are
constantly adjusted to maintain stability with
automatic fallback from full-duplex to pseudo-duplex
operation. The speakerphone algorithm allows
position independent placement of microphone and
speaker. The host can separately control volume,
muting, and AGC in microphone and speaker
channels.
V.70 DSVD Mode using RCDSVD SCP Device
(S Models)
On-board DSVD operation requires installation of the
optional RCDSVD SCP (R6715-14). GSM operation
is not available when the RCDSVD SCP is
connected because MCU port PB5 is used for SCP
chip select output (~SVDSEL) rather than address
line A18 output which is needed to support the 4M
ROM.
DSVD provides full-duplex digital simultaneous voice
and data over a single telephone line. DSVD uses
codecs in the RCDSVD SCP to code (compress)
analog speech signals on the RCDSVD LINEIN pin
or MICIN pin for passing to the modem controller in
digitized form. DSVD also decodes (decompresses)
coded speech received from the modem controller
for routing to the RCDSVD LINEOUT pin or
SPKP/SPKN pins in analog form.
DSVD operates in accordance with ITU-T
interoperable G.729 and G.729 Annex A with
interoperable G.729 Annex B. Voice activity
detection supports speech coding at an average bit
rate significantly lower than 8.0 kbps.
DSVD decoder timing recovery algorithm
compensates for clock skew, asynchronous host-to-
decoder data transfer delay, intervening variable
length data block transmission delay, and loss of
encoded speech data.
The voice interface can be in the form of a headset,
handset or a microphone and speaker (half-duplex
speakerphone). Handset echo cancellation supports
handset use through a hybrid.
In Handset Mode, the RCDSVD SCP interfaces to
the telephone interface circuit using the Line Input
(LINEIN) and Line Out (LINEOUT) lines. In Headset
or Speakerphone Mode, the RCDSVD SCP
interfaces to the audio interface circuit using the
Microphone Input (MICIN) and Speaker out (SPKR)
lines.
GSM (Parallel Host or PC Card Interface)
GSM operation requires installation of 4M (512k x 8)
ROM (56 models) or 2M ROM (33 and 14 models).
ON-board DSVD is not available when the 4 Mbit
ROM is installed since the MCU port PB5 is used for
address line 18 rather than RCDSVD SCP chip
select output (~SVOSEL).
Features supported in GSM operation include:
Data modem
V.21, V.23, V.22, V.22 bis, V.32
ISDN interoperability: 300 bps to 9600 bps
Transparent asynchronous mode up to 9600 bps
Non-transparent mode (RLP) up to 9600 bps
Fax modem send and receive rate up to 9600 bps
AT GSM commands (ETSI 07.07)
GSM direct connect
Firmware interface for OEM-provided phone driver
Automatic GSM cable presence detection
Built-in parallel host (16550A UART) interface
Sleep Mode
Sleep mode is supported in the modem device set
and the RCDSVD SCP device.
Additional Information
Additional information is described in the SmartACFL
Modem Device Family with SmartDAA Technology
for Low Power Applications Designer’s Guide (Doc.
No. 100446) and the Command Reference Manual
(Doc. No. 100500).
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