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| 型号： | DSRT-L030-011 |
| 厂商： | CONEXANT SYSTEMS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, XMA |
| 文件页数： | 3/86页 |
| 文件大小： | 667K |
| 代理商： | DSRT-L030-011 |
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RipTide PCI Audio/Comm Device Family Product Description
1167
ROCKWELL PROPRIETARY INFORMATION
11
3.3.2.2
Fax Mode
In fax modem mode, the modem can operate in 2-wire, half-duplex, synchronous mode and can support Group 3 facsimile
send and receive speeds of 14400, 12000, 9600, 7200, 4800, or 2400 bps. Using V.34 modulation to optimize modem
configuration for line conditions, the modem can also connect at the highest data rate that the channel can support at speeds
up to 33.6 kbps with automatic rate adaption. Fax data transmission and reception performed by the modem are controlled
and monitored through the fax EIA/IA-578 Class 1 and T.31 Class 1.0 command interface. Full HDLC formatting, zero
insertion/deletion, and CRC generation/checking are provided.
3.3.2.3
Voice/TAM Mode
Voice/TAM Mode features include 8-bit
-Law, A-Law, and linear coding at 8 kHz sample rates. Tone detection/generation,
call discrimination, and concurrent DTMF detection are also supported. ADPCM coding is also supported on the host to meet
Microsoft WHQL logo requirements.
Voice/TAM Mode is supported by three submodes:
Online Voice Command Mode supports connection to the telephone line or a voice/audio I/O device (e.g., microphone and
speaker).
Voice Receive Mode supports recording voice or audio data, typically from a microphone or the telephone line.
Voice Transmit Mode supports playback of voice or audio data, typically to a speaker or the telephone line.
3.3.2.4
Speakerphone Mode
The speakerphone mode features an advanced proprietary speakerphone algorithm which supports full-duplex voice
conversation 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 speakerphone mode provides hands-free full-duplex telephone operation under host control. The host can separately
control volume, muting, and AGC in microphone and speaker channels.
The speakerphone mode also supports Voice/TAM Mode connection to a handset.
3.3.2.5
Digital Speakerphone Mode
Speakerphone use over the internet used with applications such as Microsoft Netmeeting is fully supported.
3.3.2.6
Synchronous Access Mode (SAM)
V.80 synchronous access mode is provided for host-controlled communication protocols, e.g., H.324 video conferencing
applications. Voice-call-first (VCF) before switching to a videophone call is also supported. In effect, RipTide simply allows
audio and video signals to be sent to another modem using analog phone lines. The PC will have to be separately equipped
with a video camera and video capture card. The video capture card’s audio signal may be connected to the RipTide Codec
as an analog audio input or as a digital audio signal using the I
2S port.
3.3.2.7
Host-Controlled DSVD Mode
Host-controlled DSVD (Soft DSVD) is supported. A microphone and a speaker are required. ITU-T interoperable G.729 and
G.729 Annex A with interoperable G.729 Annex B operation is supported. Voice activity detection supports speech coding at
an average bit rate significantly lower than 8.0 kbps.
3.4
AMC’97 Codec
The Audio Modem Codec (AMC or Codec) device (RAMC001) combines two coder/decoder functions, compliant to Intel
Audio Codec ’97 2.0 extensions for combo audio modem codec (AMC’97), into an 80-pin PQFP which supports two telephone
lines (RAMC002) or a 64-pin TQFP which supports one telephone line (RAMC001). The Codec operates on +3.3V power with
+5V tolerant inputs or on +5V power.
The Codec communicates to the RipTide Controller through a digital serial link (AC-link). All digital audio streams, modem
data (telephone line, handset, and microphone/speaker), GPIO data, and codec command/status information is transferred
between the Controller and the Codec over this point-to-point serial channel.
For details, please refer to the RipTide RAMC001 and RAMC002 Audio Modem Codec (AMC’97) Product Description (Order
No. 1166).
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