ISD-T360 ETC [List of Unclassifed Manufacturers], ISD-T360 Datasheet - Page 95

• Manufacturer Part Number: ISD-T360
• Description: VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support
• Manufacturer: ETC [List of Unclassifed Manufacturers]

ISD
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Index
Dial Tone:
TONE_DET_TIME_COUNT
Busy and Dial Tone:
TONE_DET_ON_ENERGY
_
THRESHOLD
Busy and Dial Tone:
TONE_DET_OFF_ENERGY
_
THRESHOLD
Busy Tone:
BUSY_DET_MIN_TIME
Busy Tone:
BUSY_DET_MIN_ON_TIM
E
Busy Tone:
BUSY_DET_MAX_ON_TIM
E
Parameter Name
Table 2-7: TUNABLE PARAMETERS: Tone Detection
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.
Maximum energy level at which busy and dial tones are
detected as OFF (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 the same as for TONE_ON_ENERGY_THRESHOLD
Legal values: 0 to 65535.
Minimum time period for busy detection, in 10 ms units. The
accuracy of the constant is ±10 ms.
Legal values: 0 to 65535.
Minimum period considered as On period for busy tone
detection. Note that for weak signals:
(–30 dB and below) the maximum value is 12 (i.e., 120 ms
minimum detection time).
Unit: 10 ms. Accuracy is ±20 ms.
Legal values: 10 to 1000.
Maximum period considered as On for busy-tone detection.
Unit: 10 ms. Accuracy is ±20 ms.
Legal values: 10 to 1000.
10
20
100
500
8000
Tunable value
Description
Energy threshold (dB-Volts)
–31.8
–28.6
–21.7
–14.7
–2.5
700
160
110
600
10
168
Default
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