AN2384 Freescale Semiconductor / Motorola, AN2384 Datasheet - Page 25

• Manufacturer Part Number: AN2384
• Description: Generic Tone Detection Using Teager-Kaiser Energy Operators on the StarCore SC140 Core
• Manufacturer: Freescale Semiconductor / Motorola

Freescale Semiconductor
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Generic Tone Detection Using Teager-Kaiser Energy Operators on the StarCore SC140 Core, Rev. 1
Mitel Side 1 Test 5: Dynamic range. This test determines the dynamic range in dB by gradually
attenuating the tones in the key 1. The AT&T requirements of the Q.24 standard require the power
level to be at least –25 dBm0. The test passed.
Mitel Side 1 Test 6: Guard time. This test determines the minimum signal duration in milliseconds to
detect the tones in the key 1. The AT&T requirements of the Q.24 standard require the minimum
signal duration to fall between 40 and 23 ms. The test passed.
Mitel Side 1 Test 7: Signal-to-noise ratio. This test determines whether a receiver can detect 1000
pulses of the tones in the key 1 with white noise to create three different signal to noise ratios. The test
passed.
Mitel Side 2 Test 2 Talk-off test. This test is a 30-minute condensed recording of conversations. The
Mitel document states that a receiver with an acceptable talk-off response should register less than 30
tones. The test passed.
KEY-D
KEY-1
KEY-5
KEY-9
Key
S/N -24 dBV
S/N -18 dBV
S/N -12 dBV
S/N Ratio
0 to +20 dB
0 to +20 dB
0 to +20 dB
0 to +20 dB
28.7 ms (P)
0 to –20 dB
Table 10. Mitel Side 1 Test 6 Results Summary
Table 11. Mitel Side 1 Test 7 Results Summary
0 to -20 dB
0 to -20 dB
0 to -20 dB
Table 8. Mitel Side 1 Test 4 Results Summary
Frequency
Table 9. Mitel Side 1 Test 5 Results Summary
29 dB (P)
Set-up 1
Set-up 1
1000 (P)
1000 (P)
1000 (P)
Set-up 1
28.5 ms (P)
29 dB (P)
19.9 (P)
17.6 (P)
20.0 (P)
13.8 (P)
20.0 (P)
11.3 (P)
20.0 (P)
17.9 (P)
Set-up 1
Set-up 2
Set-up 2
1000 (P)
1000 (P)
1000 (P)
Set-up 2
27.4 ms (P)
27 dB (P)
20.0 (P)
17.9 (P)
20.0 (P)
14.6 (P)
20.0 (P)
11.9 (P)
20.0 (P)
17.3 (P)
Set-up 2
Set-up 3
Set-up 3
1000 (P)
1000 (P)
1000 (P)
Set-up 3
DTMF Q.24 Compliance Tests
Set-up 3
19.6 (P)
16.9 (P)
20.0 (P)
16.0 (P)
20.0 (P)
14.7 (P)
19.8 (P)
11.8 (P)
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