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Direction of Audio - Wireless Microphone Application

Danny Chow
Prodigy 30 points

Hi all,

   We are developing a wireless pickup system (microphone or musical instrument pickup). So, the audio source will be the microphone (or the musical instrument) which moves around during using. The audio output will be a stationary receiver. Let 's assume we only have one audio source in stereo and one receiver. Antenna diversity is off. In this case, which end should be the master you suggest? Link performance is the main concern.

   According to the sticky post "Improving link performance", audio from master to slave is better. So it seems that I should set the audio source (microphone side) as the master.

   But there were some post talked about the wireless microphone should be the slave. Please comments.

Danny

  • 0
    TI__Expert 3240 points
    Hi,

    I couldn't find the post about the microphone you refer to, but it is often more natural to have the microphone as the audio producer in many applications. Then you could have e.g. multiple mic inputs. If you are only having one master and one slave in the network, then you could go for the "Improving link performance" statement and have the master as the audio producer. But if you want to have multiple inputs, then you would have to use slaves as the audio producers.

    Regards,
    Johan
  • 0 in reply to Johan Gustafsson
    Prodigy 30 points
    Hi Johan,

    Thanks for your comments. Link performance is the first priority and we will not have multiple audio source at this moment. So, I think we will assign the microphone/pickup as master and the receiver as slave. Our test also showed that this configuration is more stable in our application (i.e. moving audio source).

    In order to further improve the link performance, we are going to test the "Antenna Diversity" function. So, in our case, we will apply 2 antennas in the receiver side (slave) which is stationary. One antenna is an internal inverted-F and another one is an external antenna. Do you think that it is ok?

    Thanks!

    Danny
  • 0 in reply to Danny Chow
    TI__Expert 3240 points

    Hi Danny,

    It is possible to use the antenna diversity like this. One thing is, depending on the placement of the two antennas e.g. next to each other, that the external antenna may always be superior to the inverted-F antenna and therefore always used. Then the only contribution of the antenna diversity would then be some loss in the switch.

    To remove this placement consideration it could be an idea to use two antennas with the same performance. But again, it could still work with two different antennas if the placement is "good" for the specific use case. 

    Regards,
    Johan