GUIDE · LECTURE
Denoise a lecture recording without uploading
Clean HVAC and room noise from lecture or class recordings on iPhone or iPad — on-device RNNoise, no cloud account, no upload.
Lectures and the HVAC problem
Lecture halls and classrooms hum. Air handlers, projectors, and distant chatter sit under the speaker. Students and researchers often need clearer playback — without uploading hours of audio to a cloud enhancer.
On-device cleaning with ARP
- Capture or collect the file. Phone mic, recorder export, or a share into Files.
- Add it on iPhone or iPad. Recordings → Add Recording. Lectures up to 3 hours.
- Run ARP on the lecture track. Speech-oriented material gets RNNoise plus clarity on-device.
- Keep a cleaned copy. Export M4A free, or WAV/AIFF with Premium. Sample rate follows the source.
Why “without uploading” matters
Lectures can include unpublished research or institutional content. ARP’s design: processing stays on the device. Details: on-device vs cloud and Privacy Policy.
Practical tips
- Recordings are cleaned one at a time. A long lecture takes a while — start it when you can leave ARP open.
- 10 recordings free; Premium is one-time — no subscription.
- Transcribe the original and the cleaned version to see what the cleaning recovered; export the transcript as TXT or SRT.
Your recording stays on your device. 10 recordings free; Premium is a one-time purchase.
