ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 179

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

Tone Disabler 0 (TD_RXDET0/TD_TXDET0)
The tone disabler 0 detects the phase inverted signal (ANSPM) of a 2100 Hz single tone signal input to the receive
and transmit sides of CH0, and also detectes the single tone signal (ANS). The tone disabler 0 can be activated
individually for reception and transmission using the control registers TD_RXDET0_EN and TD_TXDET0_EN.
When the phase inversion of an input signal is detected, “1” is set in the applicable control register at the time of tone
detection.
Also, if a silent state continues after detection, the tone disabler releases the signal (clears the applicable control
register to “0”). Figure 49 shows the detection timing of the tone disabler, using the transmit side as an example. The
following shows the various detection characteristics of this detector:
(Tone detection characteristics)
• Detection frequency
• Detection level
(Phase inversion detection characteristics)
• Detecting conditions
• Phase inversion characteristics:180 degrees
(Release characteristics)
• Detection level
• Release time
A. : TD_RXDET0 related
A-1. : TD_RXDET0 enable control register (TD_RXDET0_EN)
A-2. : TD_RXDET0 2100 Hz single tone detection status register (ANS_RXDET0)
A-3. : TD_RXDET0 2100 Hz phase inversion detection status register (ANSPM_RXDET0)
OKI Semiconductor
ANSPM_TXDET0
TD_TXDET0_EN
transmitting side
0 : Stop (Initial value)
1 : Operate
0 : Not detected (Initial value)
1 : Detected
0 : Not detected (Initial value)
1 : Detected
ANS_TXDET0
Tone detecting
internal signal
Input on the
–33.5 dBm0 or less
100 ms
Figure 49 Tone Disabler 0 Transmit Side Detection Timing
ON guard timer
: 2100 Hz
: –34 dBm0 or more
: Detects phase inversion once for each timing before and after a tone of 2100 Hz ,
for approx. 450±25 ms.
2100 Hz tone signal
OFF guard timer
ON guard timer
2100 Hz phase inverted signal
FEDL7224-001FULL-01
OFF guard timer
ML7224-001TC
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