KA8601C Просмотр технического описания (PDF) - Samsung

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производитель

KA8601C

SPEAKER PHONE WITH SPEECH NETWORK

Samsung 

KA8601C

SPEAKER PHONE WITH SPEECH NETWORK

2. VOLUME CONTROL

The volume control can only be applied in the receive mode. If the voltage of the VC mode is the same as the VB, the

receive attenuator gain is maximized and the transmit gain is minimized. At the same time, if the VC mode voltage is

less than the VB, the receive attenuator gain is reduced.

VB

KA8601C

VC

VOLUME

Fig. 5

3. VOICE DETECTION FUNCTION

The voice detection function compares the microphone amplifier output level with the outside audio amplifier level

and the transmit attenuator output level with the receive attenuator input level, after which they are inputted into the

control box. The block diagram of the voice detection function is as follows:

DETIRX 1

DETO RX 1

A1

PDRX

Background

Noise Monitor

Log Amp

Comparator

C1

PDTX

DETO TX 1

Comparator

C2

A3

DETI TX 1

Log Amp

Log Amp

DETITX 1

A2

CO1 CO2 CO3 CO4

Attenuator Control Box

Log Amp

A4

DETI RX 1

DETO TX 1

DETO TX 1

Fig. 6

It is useful to use a background noise monitor when high background noise occurs. When the input signals to the

background noise monitor are increased, voltage for the PDRX (PDTX) mode is stably increased. The increase time

is determined by 100KΩ and 47µF.

4. ATTENUATOR CONTROL BOX

In figure 6, each signal coming into the log amplifier is amplified and then inputted into the comparator (C1, C2). The

comparator compares the amplified signal levels, after which they are inputted into the attenuator control box. The

attenuator control box processes these signals (CO1, CO2, CO3, CO4) as logic signals, and which are put into one

of the following modes:

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