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參數資料
| 型號： | AMBE2000 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VOCODER CHIP |
| 中文描述： | 聲碼器芯片 |
| 文件頁數： | 30/47頁 |
| 文件大小： | 324K |
| 代理商： | AMBE2000 |
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AMBE-2000 Vocoder Chip
User’s Manual Version 3.0
page 30
Visit us at
www.dvsinc.com
Confidential Proprietary, Subject to Change
5.3.1 Formatted Output : Word 0 : Header
The header is a 16 bit word that begins each valid frame corresponding to 20 milliseconds of speech. This field will always be
0x13EC
.
5.3.2 Formatted Output : Word 1 : ID (Power Control)
The encoder will always use
0x00
in the 8-bit field of an output frame.
5.3.3 Formatted Output : Word 1 :Control Word 1
This 8-bit control word indicates the activity of various functions.
Table 5-J Control W ord 1 Format
Control Word 1 – 8-bits (See Table 1-A)
5
4
Decoder
Frame
Repeat
Detect
7: MSB
6
3
2
1
0 : LSB
Encoder
DTMF
Detect
Unused
Unused
Decoder
Silence
Unused
Unused
Encoder
Silence
Detect
Decoder Frame Repeat
: When the Decoder Frame Repeat flag is set to 1, the decoder is reporting that the last frame decoded
was a repeat of the previous frame.
Decoder Silence Detect
: When the Decoder Silence Detect flag is set to 1, the decoder is reporting that the last frame decoded
was a comfort noise frame.
Encoder DTMF Detect
: The Encoder DTMF Detected Flag will be set to a 1 when the encoder detects a DTMF tone. The
DTMF Detect option is controlled by the DTMF Detect/Generate bits in control Word 10 described in section 5.2.8 enable the
DTMF Detect option.
Silence Detect
: The Encoder Silence Detected Flag will be set to 1 when no voice activity is detected. The Silence Detect
option is controlled by and can be disabled by the VAD as described in section 5.2.9.
5.3.4 Formatted Output : Words 2-6 : Rate Info 0, Rate Info 1, Rate Info 2, Rate Info 3,
Rate Info 4.
Words 2-6 in the packet indicate the rate at which the AMBE-2000 encoder is operating . These words are output. See
tables 5-C and 5-D for corresponding values.
5.3.5 Formatted Output: Word 7 : Bit Error Rate
This status field is used for the decoder to report bit error information. The 16 bit number output is used to compute the BER
using the following calculation
% BER = (Word 7) / (32768)
5.3.6 Formatted Output : Word 10 : DTMF Control
This word corresponds to the DTMF Detection capabilities of the vocoder. It uniquely identifies specific tones recognized by
the encoder. See table 5-J for a list of tones and their corresponding values.
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