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VP-102 / VP-202 User Manual
41
The first 3 rows in the gain settings page shows the 3 modes of operation: Handset, Handsfree, and
Headset. Each mode uses the same configuration as shown in the block diagram above. The left
hand column (first 3 rows) shows the mode of operation. The various gain settings are described as
follows:
g) Microphone AFE refers to the Analog Front End Gain block (
G1
).
h) Microphone VGC refers to the Volume Gain (
G3
). This gain should be changed with caution
since it affects the tone level as well. If the tone generated is a DTMF tone, changing this
gain may affect the detection of the DTMF tone by the outside network.
i) Speaker refers to the Volume Gain (
G4
).
j) Microphone CGC on the 4
th
row in the Gain Settings page refers to the Encoder Calibration
Gain CGC (
G2
). Changing this gain does not affect the signals from the Tone / FSK
generator.
k) Speaker Levels refer to the relative levels in the volume settings. There are a total of 6
volume settings from 1 to 6. The relative levels are listed in ascending order. When the
volume setting is set to 1, the Decoder Calibration Gain CGC (
G5
) is set to its preset value
(cannot be changed) + the relative level specified for volume setting 1. If the relative level is
blank,
G5
is set to its minimum value. This means that the speaker is effectively muted.
l) The Analog Front End Gain (
G6
) is factory preset and cannot be changed.
