| Bob F <bobnospam@gmail.com>: Jan 14 11:17AM -0800 I have been trying to get my Galaxy S9 to record FM radio programs. NextRadio is the only app that I have gotten to work to receive FM using the internal tuner, but it has no record capability. I have the app Audio Recorder loaded, which works for a headphone/w microphone well, but does not work with the Recording Source set to internal audio with the NextRadio app, which I had hoped would work. So, I am trying to make a cable from a 4 wire TRRS audio cable that can plug into the phone, acting as the FM antenna, and feed reduced signal from the audio outputs from the phone into the microphone signal input to the phone. I used a 29.5 inch length of the audio cable with the TRRS male plug at one end, and built the following circuit at the other end, hoping the would signal the phone that it has earphones and a microphone connected to the phone so Audio Recorder can record from the back fed headphone output. https://source.android.com/docs/core/audio/latency/loopback Unfortunately, this is not working. It seems the phone is not detecting the signal coming in as an external mic, and picks up the intern phone mic instead. My understanding is that the phone looks for the impedance of a mic to make the switch, and it seem the resisters in the above circuit is not causing that to happen. If anyone has knowledge about what the phone expects to make the mic switch, I can definitely use some help. A record app that can force external mic switching could be a solution. A FM radio program that can use internal audio or that has built in record function that will work on the S9 could also be my solution. |
| Bodger <nobody@nowh.ere>: Jan 14 04:03PM -0500 On 1/14/2023 2:17 PM, Bob F wrote: > I have been trying to get my Galaxy S9 to record FM radio programs. > NextRadio is the only app that I have gotten to work to receive FM using > the internal tuner, but it has no record capability. snip... I have no idea about your problem but I'm gobsmacked that a phone has an external microphone input. I've never seen or heard of such a thing. |
| Bob F <bobnospam@gmail.com>: Jan 14 01:25PM -0800 On 1/14/2023 1:03 PM, Bodger wrote: > snip... > I have no idea about your problem but I'm gobsmacked that a phone has an > external microphone input. I've never seen or heard of such a thing. It is the same jack that you plug headphones into. Completely compatible with headphones that include a mic with a 4 conductor TRRS plug. I think that is pretty common. I should add to the original post that my OS is updated to Android 10, G960UTUES9FVD1. |
| "Carlos E.R." <robin_listas@es.invalid>: Jan 14 10:37PM +0100 On 2023-01-14 22:03, Bodger wrote: > snip... > I have no idea about your problem but I'm gobsmacked that a phone has an > external microphone input. I've never seen or heard of such a thing. All phones that have a connector for external earphones on cable, that same connector and cable have provision for a microphone. -- Cheers, Carlos. |
| Bodger <nobody@nowh.ere>: Jan 14 06:29PM -0500 On 1/14/2023 4:25 PM, Bob F wrote: > that is pretty common. > I should add to the original post that my OS is updated to Android 10, > G960UTUES9FVD1. OK, now that makes sense. Somehow my mind jumped to the image of a separate microphone input. Probably some gray cells are winking out from lack of use... |
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