isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 92

• Manufacturer Part Number: isd-t360sb
• Manufacturer: ETC-unknow

ISD-T360SB
2-56
17
24
26
60
61
18
19
Index
Index
Energy Level:
DTMF_DET_MIN_ENERGY
Echo Canceler:
DTMF_DET_ECHO_DELAY
Twist Level:
DTMF_DET_REV_TWIST
SW AGC:
DTMF_DET_AGC_IDLE
SW AGC:
DTMF_DET_AGC_PLAY
Dial Tone:
TONE_DET_TIME_COUNT
Busy and Dial Tone:
TONE_DET_ON_ENERGY_
THRESHOLD
Parameter Name
Parameter Name
Table 2-6: TUNABLE PARAMETERS: DTMF Detection
Table 2-7: TUNABLE PARAMETERS: Tone Detection
Minimum energy level at which DTMF tones are detected. If you
divide (multiply) the value by 2, the detection sensitivity decreases
(increases) by 3 dB.
Legal values: 8 to 4096
The near-echo delay in samples. The sampling rate is 8000Hz (i.e.,
125 ms per sample).
Legal values: 0 to 8.
Controls the reverse twist level at which the VoiceDSP processor
detects DTMF tones. While the normal twist is set at 8 dB, the reverse
twist can be either 4 dB (default) or 8 dB (if this parameter is set to
1).
SW AGC for DTMF in Idle/Record modes. When incrementing the
tunable by 1, the dynamic range is increased by 3 dB.
Legal values: 0 to 5.
SW AGC for PLAY and TONE_GENERATE modes. When incrementing
the tunable by 1, the dynamic range is increased by 3 dB.
Legal values: 0 to 5.
Controls the duration of a tone before it is reported as a dial tone,
in 10 msec units. The accuracy of the constant is ±10 ms.
Legal values: 0 to 65535.
Minimum energy level at which busy and dial tones are detected
as ON (after 700Hz filtering). If you divide (multiply) the value by 2
you get about 3 dB decrease (increase) in the threshold.
The mapping between energy level and the parameter value is as
follows (measured on the codec output when a 400Hz tone was
injected to the codec input):
Legal values: 0 to 65535.
10
20
100
500
8000
Tunable value
Description
Description
Energy threshold (dB-Volts)
–31.8
–28.6
–21.7
–14.7
–2.5
Voice Solutions in Silicon™
2—SOFTWARE
32
4
0
0
3
700
160
Default
Default