ML7204-003 datasheet(49/214 Pages) LAPIS

49 / 214 page

FEDL7204-003-02

ML7204-003

49/214

When 2-channel voice data transmission/reception is specified, Speech CODEC performs the following

operation. The receive side decodes the received data of CH1 and CH2 that has been written from MCU and

adds the data to the Speech CODEC output. The transmit side encodes the following two types of voice data

and requests the reading of the data to the MCU for CH1 and CH2 individually.

Encoder input signal (CH1)

= (Transmit data AIN_x input to Speech CODEC) + (CH2 receive data Rx_CH2)

Encoder input signal (CH2)

= (Transmit data AIN_x input to Speech CODEC)+ (CH1 receive data Rx_CH1)

This function enables 3-way communication between the NW side (2 parties) and the terminal side (1 party).

Figure 31 shows the transmit/receive data flow in Speech CODEC under the three-way communication that is

performed between the terminal (A), which is connected to the analog interface of this LSI, and the terminal (B)

and another terminal (C) on the NW side.

Figures 32 to 35 show the transmit/receive buffer control methods at 2-channel processing.

Figure 31

Transmit/Receive Data Flow at 2-Channel Operation

(Note)

When G.729.A is selected as the Speech CODEC coding format, the setting of DC_EN = 1 is inhibited.

When the G.711 PLC function is enabled, the setting of DC_EN = 1 is inhibited.

Terminal A

Terminal B

Terminal C

Speech Codec

Buffer0

Bus Control

Unit

RXGAIN

_CH1

G.729.A

G.711

Encoder

CH1

CH2

G.711

G.729.A

Decoder

RXGAIN

_CH2

DC_EN

RX1TX2_

GAIN

RX2TX1_

GAIN

A+C

(to B)

A+B

(to C)

B+C

(to A)

Inhibited

TXGAIN

_CH1

TXGAIN

_CH2

Buffer1

CH2

CH1

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