HP MSR2000/3000/4000 Router Series Voice Command Reference

25
The maximum energy of the input signal in the row frequency group is ROWMAX and the corresponding
doubled frequency energy is ROW2nd. The maximum energy in the column frequency group is
COLMAX and the corresponding doubled frequency energy is COL2nd.
Table 3 Meaning of index numbers
Inde
x
Meanin
g
Value ran
g
e Remarks
0
Lower limit of (ROWMAX + COLMAX). The input
signal is recognized as a DTMF digit if
(ROWMAX + COLMAX) > Value for index 0.
1 to 4999, with a
default of 1400
The larger the value, the
higher the detection
specificity and the lower
the detection sensitivity.
1
Upper limit of the maximum value of ROWMAX
or COLMAX, whichever is larger. This limit is
used for detecting the inter-digit delay. A
detected digit is regarded ended only when max
(ROWMAX, COLMAX) < Value for index 1.
1 to 4999, with a
default of 458
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
2
Lower limit of COLMAX/ROWMAX, where
ROWMAX < COLMAX. An input signal is
recognized as a DTMF digit only when 10 x
(COLMAX/ROWMAX) > Value for index 2.
–18 to –3 dB, with a
default of –9 dB
The larger the value, the
higher the detection
specificity and the lower
the detection sensitivity.
3
Lower limit of ROWMAX/COLMAX when
COLMAX  ROWMAX. The function is similar to
that of index 2. An input signal is recognized as
a DTMF digit only when 10 x
(ROWMAX/COLMAX) > Value for index 3.
–18 to –3 dB, with a
default of –9 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
4
Upper limit of the ratio of the second largest
energy level from the row frequency group to
ROWMAX. The ratio must be lower than this limit
for the input signal to be recognized as a DTMF
digit.
–18 to –3 dB, with a
default of –9 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
5
Upper limit of the ratio of the second largest
energy level from the column frequency group to
COLMAX. The ratio must be lower than this limit
for the input signal to be recognized as a DTMF
digit.
–18 to –3 dB, with a
default of –9 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
6
Upper limit of ROW2nd/ROWMAX. An input
signal is recognized as a DTMF digit only when
ROW2nd/ROWMAX < Value for index 6.
–18 to –3 dB, with a
default of –3 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
7
Upper limit of COL2nd/COLMAX. The ratio must
be lower than this limit for the input signal to be
recognized as a DTMF digit.
–18 to –3 dB, with a
default of –12 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
8
Upper limit of the ratio of the maximum energy
level of two extra specified frequency points to
max (ROWMAX, COLMAX). The ratio must be
greater than this upper limit for the input signal to
be recognized as a DTMF digit.
–18 to –3 dB, with a
default of –12 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.