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参数资料
| 型号： | CS6422-CS |
| 厂商： | CIRRUS LOGIC INC |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | Enhanced Full-Duplex Speakerphone IC |
| 中文描述： | SPEAKER PHONE CIRCUIT, PDSO20 |
| 封装： | 0.300 INCH, MS-013, SOIC-20 |
| 文件页数： | 32/48页 |
| 文件大小： | 873K |
| 代理商： | CS6422-CS |
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CS6422
32
4. DESIGN CONSIDERATIONS
When designing the CS6422 into a system, it is im-
portant to keep several considerations in mind.
These concerns can be loosely grouped into three
categories: algorithmic considerations, circuit de-
sign considerations, and system design consider-
ations.
4.1
The CS6422 facilitates full-duplex hands-free
communication via many algorithms running on
the Digital Signal Processor that is the core of the
CS6422. Among these are the algorithms that per-
form the adaptive filtering, the half-duplex switch-
ing, digital volume control, and supplementary
echo suppression.
Algorithmic Considerations
4.1.1
Full-Duplex Mode
Full-duplex hands-free communication is achieved
through a technique called adaptive filtering. The
basic principle behind adaptive filtering is that the
acoustic path between speaker and microphone can
be modeled by a transfer function which can be dy-
namically determined by an adaptive digital filter.
This principle assumes good update control and
speech/tone detection algorithms to prevent the fil-
ter from mistraining.
4.1.1.1
Theory of Operation
Figure 10 illustrates how the adaptive filter can
cancel echo and reduce loop gain. The echo path of
the system is between points B and C: the speaker
to microphone coupling. A signal injected at A
(sometimes called a
“
training signal
”
) is sent both
to B, the input of the echo path, and to F, the input
of the adaptive filter. The signal at B is modified by
the acoustic transducers (speaker and microphone)
and the environment, and received at point C (as an
“
Echo
”
). Meanwhile, assume that the adaptive fil-
ter has exactly the right transfer function to match
the echo path BC, and so the signal at point D is ap-
proximately equal to the signal at point C. After
these are subtracted by the summing element, all
that is left is the error signal at point E, which
should be very small.
If a person were to speak into the microphone at
point C, that signal would pass through the sum-
ming element unchanged because the adaptive fil-
ter had no comparable input to subtract out. In this
manner, the person at A and the person at C may si-
multaneously speak and A will not hear his own
echo.
In the real world, the echo path is not static. It will
change, for example, when people move in the
Σ
Adaptive Filter
A
E
D
B
C
+
-
F
Figure 10. Simplified Acoustic Echo Canceller Block Diagram
DS295F1
相关PDF资料 |
PDF描述 |
|---|---|
| CS6422-CSZ | Enhanced Full-Duplex Speakerphone IC |
| CS7054 | Low Side PWM FET Controller(高端PWM FET控制器) |
| CS7054YDW16 | DC Motor Controller/Driver |
| CS7054YDWR16 | DC Motor Controller/Driver |
| CS7410 | CD/MP3/WMA Audio Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS6422-CSZ | 功能描述:音频放大器 Enhanced Full-Duplex Speakerphone IC RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| CS6422-CSZ | 制造商:Cirrus Logic 功能描述:ICTelephone Speech CircuitSOP20PINPL |
| CS6422-CSZ | 制造商:Cirrus Logic 功能描述:IC TELEPHONE SPEECH CIRCUIT 20SOP |
| CS6422-CSZ/A | 功能描述:IC SPEAKERPHONE ENHANCED 20SOIC 制造商:cirrus logic inc. 系列:* 零件状态:过期 标准包装:37 |
| CS6422-CSZR | 功能描述:电信集成电路 IC Enhanced Full-Duplx Spkrphone RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
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