Audio processor recommendation for megaphone project

MichaelSD Question

Jul 3, 2020 00:00

Hi,

We are working on a low-power battery-operated megaphone/bullhorn project (purpose is to amplify a user's voice).

In terms of the audio flow, the user's voice will first be captured by 1 - 2 digital MEMS microphones. Next, we'll conduct the audio processing necessary to isolate and clarify the user's voice and eliminate feedback and echo. Specifically, during this audio processing stage, we are considering implementing low-latency noise reduction and acoustic echo cancellation, as well as voice detection. After processing, the audio will flow to a class D mono amplifier and then finally to the speaker.

Is there SigmaDSP-compatible audio processor or CODEC that you would recommend for such a use case?

Thanks,
Michael

Report

DaveThib Reply

Jul 7, 2020 00:00

Hello Michael,

Look into the ADAU1787. It matches most of what you are looking for. The processor is limited in MIPS but the size, low power, and the dual DSP cores for very low latency will fit this application well. I will also alert some of our other application engineers who may want to comment.

We also have some mono class D amps that may be interesting for you.

Dave T

Report

MichaelSD Reply

Jul 7, 2020 00:00

Thanks, Dave, for your reply! I'll look into the ADAU1787 and await any further comments from your team.

- Michael

Report

galvinpjg Reply

Jul 9, 2020 00:00

Michael,

You may want to look at the SSM4567, SSM2529 or SSM2537. Note the ADAU1787 can provide I2S output or PDM output to the amplifiers. The SSM4567 and SSM2529 can accommodate I2S or PDM. The SSM2537 can only accommodate PDM.

In PDM Mode, the SSM4567 supports a low latency mode via I2C register or PDM pattern. The SSM2537 only supports PDM low latency mode via PDM Pattern (the ADAU1787 can generate audio PDM output but not PDM patterns).

Please let me know if there are more questions.

Thanks,
PG

Report

MichaelSD Reply

Jul 10, 2020 00:00

Thanks for this guidance with respect to the amplifiers that might work well for our application. Much appreciated. With this feedback from yourself and the original reply from Dave T, I'm now marking this question as "Verified Answer."

Report