TM8000 3DK Hardware Developer’s Kit
Application Manual
Programmable I/O Lines
57
September 2003
© Tait Electronics Ltd
3.1.14
Mute External Audio Input
Application
This input signal is used to open or close the mute of selected audio inputs
to allow or prevent transmission of unwanted audio. This can be useful in
cases where a controller wants to send information and does not want to be
interrupted by incoming audio.
Configuration
1.
Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time (0 to 100 ms).
2.
On the same form, configure an option to mute the audio from the
microphone inputs, the audio tap inputs, or all audio inputs.
Timing
The response time for both activation and deactivation is approx. 2ms plus
debounce time.
Description
When the input line is activated, the radio mutes the audio input(s) selected.
If a higher priority unmute condition exists, activation of this line will have
no effect.
When the input line is deactivated, the audio input path reverts to its
previous state. If a higher priority mute condition exists, deactivation of this
line will have no effect.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.
Related Actions
None.
Figure 3.6
Mute External Audio Input
TX processing chain
PA
modulator
AUX_MIC_AUD
audio tap points
(mapped from AUD_TAP_IN)
Tx audio path
mux
MIC_AUD
mute
Mute External
Audio Input
mute
Toggle Tx RF Inhibit
