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playfultechnology / audio-guestbook

The "audio guestbook" is a converted telephone handset that guests can use to leave recorded messages at weddings and parties
GNU General Public License v3.0
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Greeting playback on phone noisy/robotic #67

Open critchio opened 1 year ago

critchio commented 1 year ago

I have resolved all issues and everything seems to be working correctly except my greeting message is noisy/robotic. I recorded the WAV file in audacity using mono, 44100 hz, and 16-bit. I have tried adjusting volume down but it did not solve the issue. Thanks for any advice.

cadbury commented 1 year ago

See my comment here: https://github.com/playfultechnology/audio-guestbook/issues/61#issuecomment-1472672451

Wucainclan commented 1 year ago

Hey, experiencing a similar issue here with both the greeting, as well as the recordings coming back sounding robotic and either slow or fast. I'm using the original code I referenced previous comments and tried those solutions and still can't seem to figure it out. I have also checked my connections by plugging the handset into my laptop and playing music through the speaker, etc.. I recorded my greeting message via audacity and exported at 44100hz, 16bit. I'm also using a teensy 4.0 and audio shield rev d2 with the sd card plugged into the audio shield. Any help would be greatly appreciated!

cadbury commented 1 year ago

In Audacity, choose effects, then amplify. Do -9db and see if it gets any better.

Wucainclan commented 1 year ago

In Audacity, choose effects, then amplify. Do -9db and see if it gets any better.

I tried that but it's still producing a robotic greeting, as well as robotic sounding recordings when I import the raw data into Audacity. I'm wondering if it's a bad audio shield or if (more likely) it's user error somewhere. Also, it's probably worth noting that I do hear the beep when the handset is lifted, and that sounds completely normal. I'm thinking it either has to be an issue with reading/writing data from the SD card (I am using formatted SanDisk ultra and have tried on multiple), a bad audio shield, or something in the arduino settings/code that I'm not seeing.

cadbury commented 1 year ago

After lowering the volume, did it get any better? Or did it stay exactly the same?

Wucainclan commented 1 year ago

After lowering the volume, did it get any better? Or did it stay exactly the same?

It stayed exactly the same.

Wucainclan commented 1 year ago

@cadbury Any other suggestions here? I've posted a new issue in case anyone else has any ideas, but no hits yet. Not sure where to go from here.

gever4ever commented 1 year ago

Try switching to Normal blocksize (128), it solved the robotic sound to me. I've yet to find the reason, might want to try the PJRC forums, they have a thread about the project, https://forum.pjrc.com/threads/70553-Teensy-4-0-based-Audio-Guestbook

Wucainclan commented 1 year ago

Try switching to Normal blocksize (128), it solved the robotic sound to me. I've yet to find the reason, might want to try the PJRC forums, they have a thread about the project, https://forum.pjrc.com/threads/70553-Teensy-4-0-based-Audio-Guestbook

Did you just change that in the tools menu or did you go and adjust it in the code, as well?

gever4ever commented 1 year ago

Try switching to Normal blocksize (128), it solved the robotic sound to me. I've yet to find the reason, might want to try the PJRC forums, they have a thread about the project, https://forum.pjrc.com/threads/70553-Teensy-4-0-based-Audio-Guestbook

Did you just change that in the tools menu or did you go and adjust it in the code, as well?

Just in the tools menu.

Wucainclan commented 1 year ago

Try switching to Normal blocksize (128), it solved the robotic sound to me. I've yet to find the reason, might want to try the PJRC forums, they have a thread about the project, https://forum.pjrc.com/threads/70553-Teensy-4-0-based-Audio-Guestbook

Did you just change that in the tools menu or did you go and adjust it in the code, as well?

Just in the tools menu.

I tried that and am still experiencing it with the recordings. I managed to get the greeting to play fine but recordings are giving me trouble still.

gever4ever commented 1 year ago

I tried that and am still experiencing it with the recordings. I managed to get the greeting to play fine but recordings are giving me trouble still.

Could be a faulty / reversed mic wiring? Also might want to try to play with the micGain. How do they sound on an external player?

Wucainclan commented 1 year ago

I tried that and am still experiencing it with the recordings. I managed to get the greeting to play fine but recordings are giving me trouble still.

Could be a faulty / reversed mic wiring? Also might want to try to play with the micGain. How do they sound on an external player?

I don't think it's reversed mic wiring. I checked the connections and swapped out the wires. I also played with the gain. I don't have a button for playback on the device so the recordings are always being played when I plug the SD card into my laptop. The only thing I can think of is it's an SD card thing since I'm using a Rev D2 audio shield (I changed the pin numbers on the code) or a faulty handset.

themilkman555 commented 4 months ago

I have a similar issue with the recordings being static/robotic while the greeting message is fine. Did you ever find a solution?

cadbury commented 4 months ago

Adjusting the mic gain completely fixed it for me.

Depending on the phone, I needed different settings to fix the problem.

themilkman555 commented 4 months ago

Adjusting the mic gain completely fixed it for me.

Depending on the phone, I needed different settings to fix the problem.

Sorry, I'm pretty new to all this. Mic gain is something you change in the coding, right? Should I increase or decrease it and by how much do you think?

cadbury commented 4 months ago

In the code. You probably need to lower it.

themilkman555 commented 4 months ago

You're referring to these lines here, right?

Screenshot (42) I tried lowering from 15 to 5 and it didn't seem to make much of a difference

It is a pretty old rotary phone, ~50s ish. Could the issue be with the mic there?

themilkman555 commented 4 months ago

Also just realized that in the hardware in the updated readme files it lists shielded microphone cable, which I did not use. Could that be affecting my sound quality? I just used the regular wiring I had on hand.

There is also a AOM5024 electret low noise microphone capsule listed on that hardware list. Could a better microphone possibly solve my issue?

cadbury commented 4 months ago

I was able to get all mics work. Brand new phones, some from the 90s, 60s.

Try a lower gain 1, or even 0.5

themilkman555 commented 4 months ago

I’ve done trial and error with a range of gains, even setting it very low (gain=0) didn’t fix the static. I’m using a Western Electric model 500 rotary phone.

cadbury commented 4 months ago

If you remove the SD card and play the file on a computer, does the audio still have problems?

themilkman555 commented 4 months ago

Yes. I didn’t include a playback button on my phone so I’ve only been listening to the files on a computer.