MSM7718-01 查看數據表（PDF） - Oki Electric Industry

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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7718-01

,


,
, DEN

EXCK

DIN

DOUT

DEN

EXCK

W A4 A3 A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0

High Impedance

(a) Data Write Timing

DIN

R A4 A3 A2 A1 A0

DOUT

High Impedance

B7 B6 B5 B4 B3 B2 B1 B0

(b) Data Read Timing

 Figure 5 MCU Interface Input/Output Timing

VOXO

Signal output for transmit VOX function.

The VOX function recognizes the presence or absence of the transmit voice signal by detecting the

level of the transmit signal to the line echo canceler . “1” and “0” levels set to this pin correspond

to the presence and the absence of voice, respectively. This result appears also at the register data

CR7-B7. The signal energy detect threshold is set by the control register data CR6-B6, B5.

The timiging diagram of the VOX function is shown in Fig 6.

The transmit signal to the line echo canceler refers to the signal input to the PCMLNI pin.

VOXI

Signal input for receive VOX function.

The “1” level at VOXI indicates the presence of a voice signal, the decoder block processes normal

receive signal, and the voice signal on the PCMACI pin goes through. The “0” level indicates the

absence of a voice signal and the background noise generated in this device is output to the line echo

canceler.

The background noise amplitude is set by the control register CR6.

Because this signal is ORed with the register data CR6-B3, set the control register data CR6-B3 to logic

“0”.

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