ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 190

• Manufacturer Part Number: ml7084-001
• Description: 4ch Voip Codec
• Manufacturer: Oki Semiconductor

OKI Semiconductor
B7: Through mode control
B6: Reserved bit. Do not change the initial value.
B5: Coefficient update control
B1: Attenuator control
B0: Reserved bit. Do not change the initial value.
B4: Howling detector control
B3: Center clip control
B2: Reserved bit. Do not change the initial value.
1: Through mode
0: Normal mode (echo cancelling operation)
The data of Rin and Sin is output directly to Rout and Sout while retaining their respective echo coefficients.
Further, during the through mode, the HLD, HDB, CLP, and ATTB functions are disabled.
1: Coefficient is fixed
0: Coefficient is updated
This bit specifies whether the adaptive FIR filter (AFF) coefficient of the echo canceller will be updated or
not. This function is enabled when THR is in the normal mode.
1: OFF
0: ON
This bit controls the function of detecting and removing howling which is generated in a hands-free acoustic
system, etc. This function is enabled when THR is in the normal mode.
This bit controls the center clip function in which the Sout output is forcibly fixed to the minimum positive
value when the Sout output of the echo canceller is –57 dBm0 or less and in the single talk state. This
function is enabled when THR is in the normal mode.
This bit selects the switching ON/OFF of the ATT function which prevents howling using the attenuators
ATTs and ATTr provided at the Rin input and Sout output of the echo canceller. When only the Rin input is
present, the attenuator (ATTs) of Sout will be inserted. When only the Sin input is present or when both the
Sin and Rin inputs are present, the attenuator (ATTr) of Rin will be inserted. The respective attenuation
values are 6 dB. This function becomes valid when THR is in the normal mode.
1: ON
0: OFF
1: ATT OFF
0: ATT ON
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