Any bluetooth receivers that can output audio to a TRRS plug?

F

fuzzybabybunny

Active member
I'm looking for something that I can use to record audio with via bluetooth.

I'm envisioning a transmitter that accepts a mic as an input, then a receiver that has a 3.5mm TRRS plug or whatever that can be plugged into your phone, laptop, etc.

I purchased a Sena SMH10R, which is a wireless comms device for motorcycle riders, but it can transmit audio via bluetooth. It can, for example, transmit audio via bluetooth to a GoPro bluetooth receiver. I can easily solder and replace the stock mic with a better one. The problem is that Android phones will only record incoming bluetooth audio at 8kHz and 32kbps, which is basically the very old HeadSet Profile. Modern bluetooth can support audio at much higher rates. I want to bypass all of this by just having incoming audio go through the headphone jack of the phone. It's not optimal due to the multiple conversions of the 44.1kHz+ signal back and forth between analog and digital, but anything is better than 8kHz.

So I'm primarily looking for a bluetooth receiver that can output the audio it receives into a 3.5mm plug, to be plugged into a recording device.
 
I don't think you'll find a Bluetooth audio receiver that can be plugged directly into a phone's headset jack, but you'll find lots of Bluetooth audio receivers with line-out as a 3.5 mm stereo TRS jack or a pair of phono jacks. Combine that with a break-out adapter that turns your phone's TRRS into separate mic and headphone jacks, and an attenuator to drop from line level to mic level. An inline headset volume control will work as a variable attenuator, in a pinch. If you can find a Bluetooth audio receiver with a headphone output jack and a volume control, that will do the same job.

If you're going to a laptop instead of a phone, many laptops have line inputs already. Or you can get a USB audio adapter with a line input.
 
IronFilm said:
This. Which is why I wouldn't recommend it.
Click to expand...

I see. Is the lag at least consistent throughout? Could I just nudge the audio channel around in post to sync it with the video? It shouldn't be any more work than recording the audio on an entirely separate device.
 
balazer said:
I don't think you'll find a Bluetooth audio receiver that can be plugged directly into a phone's headset jack, but you'll find lots of Bluetooth audio receivers with line-out as a 3.5 mm stereo TRS jack or a pair of phono jacks. Combine that with a break-out adapter that turns your phone's TRRS into separate mic and headphone jacks, and an attenuator to drop from line level to mic level. An inline headset volume control will work as a variable attenuator, in a pinch. If you can find a Bluetooth audio receiver with a headphone output jack and a volume control, that will do the same job.

If you're going to a laptop instead of a phone, many laptops have line inputs already. Or you can get a USB audio adapter with a line input.
Click to expand...

Interesting. So to be clear - a Bluetooth audio receiver's 3.5mm line-out is intended to output audio to things like loudspeakers and headphones, right? But if you drop down the power of the signal using an attenuator, the microphone pins on the phone's female TRRS jack will happily take the signal as a microphone?

Using a standard inline volume control wheel can I expect the incoming audio quality to drop drastically in quality since the waveform isn't perfectly preserved?
 
The lag will also make it a royal pain the ass annoying to monitor during the shoot.

Just buy wireless that is designed for the job! Such as Sony UWP-D11
 
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