MT92210 Zarlink Semiconductor, MT92210 Datasheet - Page 85

• Manufacturer Part Number: MT92210
• Description: 1023 Channel Voice Over ip (VoIP) Processor
• Manufacturer: Zarlink Semiconductor

Data Sheet
dB Correction
Maximum dB Value
Minimum dB Value
Type
HPE
BL
HP 10Hz Context
ceiling_exp
floor_exp
holdover_talk_counter
holdover_counter
floor_latch
ceiling_latch
amp_iir
LS
CTS
ceiling_exp_half_life_counter
floor_exp_half_life_counter
Latched Energy
Energy Sum
Field
Two’s complement signed number. Added to the dB energy before going to the
Min/Max value masks. When this field is worth +1, an energy of -65 dBov will be
converted to an energy of -66 dBov.
Note: The dB Correction is applied first; the Maximum/Minimum dB Value range
verification is applied next (and truncation may be done to force the value within
the range); and the Decrease/Increase Threshold calculation is performed last.
The maximum dB value is the highest energy dB value that can be generated.
Generally set to either 0 or 30.
The minimum dB value is the lowest energy dB value that can be generated.
Generally set to either 127 or 78.
How to send comfort noise packets. “000” = do not sent comfort noise packets;
“001” = send internally calculated white spectrum energy comfort noise
packets; “010” = send preprogrammed comfort noise packets; “011” = send no
comfort noise packets (send all voice packets regardless), but set marker bit at
beginning of voice period, “100” = send no comfort noise packets (send all
voice packets regardless), and set marker bit in all silent packets and at
beginning of voice period; others = reserved.
High Pass Filter Enable. When ‘1’, a 10 Hz High Pass filter will be applied to the
input signal before going through the VAD process and the energy estimation
process. If the high pass filter is not done internally, it must have been done
externally to achieve proper energy matching.
Circular Buffer Law. ‘0’ = samples in TX Circular Buffer are in u-law;
‘1’ = samples in TX Circular Buffer are in A-law.
Context of the high pass filter. Must be initialized to zero.
Should be initialized to zero by software.
Should be initialized to zero by software.
Should be initialized to zero by software.
Should be initialized to zero by software.
Should be initialized to zero by software.
Should be initialized to zero by software.
Should be initialized to zero by software.
Last packet Suppressed. When ‘1’, the last packet was suppressed.
Current talk status. When ‘0’, the VAD is currently suppressing. When ‘1’, the
VAD is not suppressing.
Should be initialized to zero by software.
Should be initialized to zero by software.
Last sent energy level exactly as it was sent in the comfort noise description
packet.
Accumulator used to estimate the idle line energy level. Must be initialized to
zero by software.
Table 28 - Fields and Description
Zarlink Semiconductor Inc.
Description
MT92210
85