MSM7617 查看數據表（PDF） - Oki Electric Industry

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MSM7617

2-Channel Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7617

PIN DESCRIPTIONS (Continued)

Pin

Symbol Type

Description

17

HD1

I Howling detection control pin for channel 1.

This pin controls detection and canceling of howling generated by the

acoustics of handsfree telephones.

"L": Howling detector on

"H": Howling detector off

18

ATT1

I ATT control pin for channel 1.

This pin controls the ATT function for preventing howling with the

attenuators (ATT) provided on RIN and SOUT. When input is only on RIN,

the SOUT attenuator is activated. When there is no input on RIN or there is

input on both SIN and RIN, the RIN input attenuator is activated. Either the

ATT for the RIN output or the ATT for the SOUT is always activated in all

cases, and the attenuation of ATT is 6 dB.

"H": Attenuator off

"L": Attenuator on

Because the attenuator is inserted opposite the speaker, it is effective for

further reducing echo.

19

SOUT1

O PCM data output pin. Output signal changes depending on the setting of

the IOM pins (refer to the block diagram).

Data is always output on the rising edge of SCK. This pin is put in high

impedance state while there is no data or during reset.

In 2-channel parallel I/O mode, this pin becomes SOUT for channel 1 and

outputs the PCM signal synchronous with SYNC1. In 2-channel serial I/O

mode, this pin outputs the SOUT signal as a multiplexed PCM signal of

SOUT signal for channel 1 and channel 2 synchronous with SYNC1.

In 1-channel cross-connected mode, this pin becomes high impedance.

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