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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7718-01

Voice Input

GSX2

VOXO

Voice

TVXON

Voice

Detect

Silence

Voice

TVXOFF

Silence

Detect (Hangover time)

(a) Transmit VOX Function Timing Diagram (for Analog Input)

VOXI

Voice

Silence

Voice

Voice Output

VFRO

Normal Voice Signal

Decoded Time Period

Background

Noise

(b) Receive VOX Function (CR6-B3: logic “0”) Timing Diagram (for Analog Input)

Note: The VOX function is valid when CR6-B7 is set to logic “1”.

Figure 6 VOX Function

MUTE

This pin is used to enable the receive side voice path mute level.

To set the mute level, set this pin to “1”.

MLV0, MLV1, MLV2

These pins are used to set the receive side voice path mute level.

For the control method, refer to the control register description (CR1). Since these pins are ORed

with CR1-B2, B1, and B0 internally, set the bits of the register to “0“ before using this pin.

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