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参数资料
| 型号： | TS34118CD |
| 厂商： | Taiwan Semiconductor Co., Ltd. |
| 英文描述： | Voice Switched Speakerphone Circuit |
| 中文描述： | 语音开关扬声器电路 |
| 文件页数： | 10/20页 |
| 文件大小： | 328K |
| 代理商： | TS34118CD |
TS34118
10-20
2004/09 rev. B
Attenuator Control Block
The Attenuator Control Block has the seven inputs described above:
-The output of the comparator operated by RLO2 and TLO2 (microphone/speaker side) - designated C1.
-The output of the comparator operated by RLO1 and TLO1 (TIP/Ring side) – designated C2.
-The output of the transmit background noise monitor – designated C3.
-The output of the receive background noise monitor
-designated C4.
-The volume control.
-The dial tone detector.
-The AGC circuit.
The single output of the Control Block controls the two attenuators. The effect of C1-C4 is as follows:
Input
Output
Mode
Transmit
Fast Idle
Fast Idle
Receive
Slow Idle
Slow Idle
Slow Idle
Slow Idle
C1
Tx
Tx
Rx
Rx
Tx
Tx
Rx
Rx
C2
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Rx
C3
1
Y
Y
X
0
0
0
X
C4
X
Y
y
1
X
0
0
0
X=Don’t Care; y=C3 and C4 are not both 0. A definition of the above terms:
1)”Transmit” means the transmit attenuator is fully on (+6.0dB), and the receive attenuator is at max. attenuation
(-46dB).
2)”Receive” means both attenuators are controlled by the volume control. At max. Volume, the receive attenuator is fully
on (+6.0dB), and the transmit attenuator is at max. attenuation (-46dB).
3)”Fast Idle” means both transmit and receive speech is present in approximately equal levels. The attenuators are
quickly switched (30ms) to idle until one speech level dominates the other.
4)”Slow Idle” means speech has ceased in both transmit and receive paths. The attenuators are then slowly switched (1
second) to the idle mode.
5) Switch to the full transmit or receive modes from any other mode is at the fast rate (
≈
30ms).
A summary of the truth table is as follows:
1)The circuit will switch to transmit if: a) both transmit level detectors sense higher signal levels relative to the respective
receive level detectors (TLI1 versus RLI1, TLI2 versus RLI2), and b) the transmit background noise monitor indicates
the presence of speech.
2)The circuit will switch to receive if: a) both receive level detectors sense higher signal levels relative to the respective
transmit level detectors, and b) the receive background noise monitor indicates the presence of speech.
3) The circuit will switch to the fast idle mode if the level detectors disagree on the relative strengths of the signal
levels, and at least one of the background noise monitors indicates speech. For example, referring to the Block
Diagram (Figure 2), if there is sufficient signal at the microphone amp output (TLI2) to override the speaker signal
(RLI2), and there is sufficient signal at the receive input (RLI1) to override the signal at the hybrid output (TLI1), and
either or both background monitors indicate speech, then the circuit will be in the fast idle mode. Two conditions
which can cause the fast idle mode to occur are a) when both talkers are attempting to gain control of the system by
talking at the same time, and b)when one talker is in a very noisy environment, forcing the other talker to continually
override that noise level. In general, the fast idle mode will occur infrequently.
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相关代理商/技术参数 |
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| TS34118CD28C4 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
| TS34118CS | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
| TS34118CS28 | 功能描述:电信语音调制 IC Voice Switch Speaker phone Circuit RoHS:否 制造商:Epson Electronics America 产品: 应用:Voice Guidance product 封装 / 箱体:PQFP-52 电源电压-最大:3.6 V, 5.5 V 最大工作温度: 最小工作温度: 封装: |
| TS34118CS28 C8 | 制造商:SKMI/Taiwan 功能描述:Voice Switched Speakerphone Circuit 28-Pin SOP Tube |
| TS34118CS28C8 | 制造商:TSC 制造商全称:Taiwan Semiconductor Company, Ltd 功能描述:Voice Switched Speakerphone Circuit |
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