ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 206

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

Outband Control 1 (OUTBAND_CONTROL1)
At the time of tone detection, mute processing is automatically performed inside the LSI when a DTMF signal is
detected. The following describes the processing contents in speech codecs.
G.711 (μ-law):
G.711 (Α-law):
Initial value : 0000h
B15–B3 : Reserved bits. Do not change the initial values.
B2 : TONE_TXDET1_OUTBAND_EN control
B1 : ANS_TXDET1_OUTBAND_EN control
B0 : DTMF1_DET_OUTBAND_EN control
• Tone Leakage Time to the Transmit Buffer
OKI Semiconductor
1 : ON (Mute processing is performed while TONE_TXDET1 is “1”.)
0 : OFF
1 : ON (Mute processing is performed while ANS_TXDET1 is “1”.)
0 : OFF
1 : ON (Mute processing is performed while DTMF1_DET is “1”.)
0 : OFF
The following shows the reference formula of the tone leakage time to the transmit buffer in each speech codec.
G.711:
Example:
The leakage time to the transmit buffer when the detection delay time of the detector is set to approximately 30
ms and the ON guard timer is set to 20 ms is as follows:
G.711:
Initial value
Initial value
Name
Name
Bit
Bit
A: Detection delay time of each detector (ms)
B: ON guard timer time of each detector (ms)
Detection delay time A of each detector depends on conditions such as the input level frequency.
Mute processing is performed for the input data of a speech codec.
0 ms + A + B
30 ms (A) + 20 ms (B) = Approx. 50 ms
Mute processing is performed for the input data of a speech codec.
B15
B7
—
—
0
0
B14
B6
—
—
0
0
B13
B5
—
—
0
0
B12
B4
—
—
0
0
B11
B3
—
—
0
0
TONE_T
XDET1_
OB_EN
B10
B2
—
0
0
FEDL7224-001FULL-01
ANS_TX
DET1_O
B_EN
B9
B1
—
0
0
ML7224-001TC
DET_OB
DTMF1_
_EN
B8
B0
—
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0
0