Tait TM8000 Series, Руководство по применению

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58 Programmable I/O Lines TM8000 3DK Hardware Developer’s Kit Application Manual
September 2003 © Tait Electronics Ltd
3.1.15 Mute Audio Output Path
Application
This input signal is used to close the mute of selected audio paths to prevent
audio from being output. This allows an external device to turn off audio to
the speaker (e.g. for a data channel) or other audio equipment.
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 100ms).
2. On the same form, configure an option to mute the audio output of
the speaker output path, the auxiliary output path, or all output paths.
Timing The response time for both activation and deactivation is approx. 2ms plus
debounce time.
Description
When this input line is activated, the radio mutes the configured audio
output path(s). If a higher priority unmute condition exists, activation of this
line will have no effect.
When this input line is deactivated, the audio output path(s) reverts to its
(their) previous state. If higher priority mute condition exists, deactivation
of this line will have no effect.
If the input line is active when the radio is powered up, it must be re-applied
for the action to be carried out.
Related Actions The ‘ Unmute Audio Output Path ’ input signal deactivates the Rx audio
path only.
The ‘ Force Audio PA Off ’ input signal deactivates the audio PA.
The ‘ Force Audio PA On ’ input signal activates the audio PA.
Figure 3.7 Mute/Unmute Audio Path
RX processing chain mute audio PA vol speaker
RX_BEEP_IN
Mute/Unmute
Audio Output Path
audio tap points
(on AUD_TAP_OUT)
RX_AUD
Rx audio path
beep audio path