Hd audio recorder 2 detected12/18/2023 ![]() ![]() In the case of the LG V20, this new setting happens to allow stereo AND no-auto-gain. However it gives one more option to users to test when they are seeking a good setting to use. Thanks to OP for suggesting the addition of this setting. However, on Android 7.0 and above devices, Google has added an additional option for Audio Source - called UNPROCESSED (in our apps we call it "Raw 2" because it is another setting which does just that Raw audio behavior). And there is no guarantee you will find a setting what gives stereo AND no-auto-gain etc. So for stereo recording, depending on your device model, you have to set Audio Source to a setting which does give good stereo audio. After saying you want stereo or 2-channel audio recording, you have to fiddle around to find an Audio Source on which stereo works, let alone raw audio. For most android devices this setting will give you mono recording without the auto-gain/noise cancellation.įor stereo recording the story is somewhat different.īecause Google did not bother to assert a policy on stereo settings, manufacturers differ even on which Audio Source setting works for stereo. If your app has an Audio Source setting, just set it to VOICE_RECOGNITION (in our AMR or Hi-Res Audio Recorder apps we call it the "Raw" setting). ![]() Generally android uses it's default auto-gain/noise-cancellation features (which can be useful for voice recording), but to disable this and get raw audio, most audio apps have an Audio Source setting (from my discussion with OP above, it seems the LG V20 HD Audio Recorder app may not have an Audio Source setting ?).ĮDIT: here is an example of the Audio Source settings in the Open Camera app which OP mentioned: It can be useful also for occasions where you want a constant recording volume, and for the recording to indicate absolute volume levels. Recording with no auto-gain/noise cancellation is needed for some occasions, like recording music - since auto-gain algorithms cannot keep up with the huge variation in volume for example during intermittent drumming - as the intermittent tone example above, or the jazz drumming example indicates. ![]() the intermittent tone ones.įor users who may be confused by the need for no auto gain, here is an explanation: Thanks to the OP for providing the samples, esp. Tones recorded and 10 kHz-notch-filtered using HD Audio Recorder, AMR w/ Raw2 (UNPROCESSED), AMR w/ Rawĭeveloper of AMR app here - by the way, for a more conventional layout users can try our Hi-Res Audio Recorder app as well. Tones recorded using HD Audio Recorder, AMR w/ Raw2 (UNPROCESSED), AMR w/ Raw The processing that other modes than UNPROCESSED apply can partly be illustrated by playing a test file over speakers of a 10 kHz tone going on and off, recording it, then notch-filtering it out to reveal any artifacts introduced by the filtering Android does. Longer audience (just clean unprocessed for whole clip) These comparisons have HD Audio Recorder's result first (gain at -20 which is 1.0 gain internally, low-cut and limiter off), then AMR w/ Raw2 (UNPROCESSED) for second half: (Comparisons are 16-bit because despite what it claims, nothing, not even HD Audio Recorder, actually capture mic input in 24 bits, just 16 bits saved as a 32-bit WAV). The stereo separation is much better than I expected. Being able to record clean stereo audio makes me really love my V20. The only other apps I've found that allow this mode are Audio Recorder by /axet, and Open Camera which allows you to use UNPROCESSED as the audio source for recording video (I only looked at free and ad-free apps). Since the V20's mic has a wider dynamic range than usual, and it doesn't actually let you capture at 24-bit, you would get a higher noise floor than on another phone with 16-bit recording, assuming the same quality of mic, amp, etc. Note that this mode is pretty quiet, as the other modes do some adjustable gain. I really like AMR for its endless customization options and have used it for many years, and on multiple occasions the author has been very receptive to feedback and making improvements, BTW. I contacted the author of AMR and he added it as Raw2 recording source, and it sounds amazing. I found that programs which use the UNPROCESSED mode give superior audio quality. I found Amazing MP3 Recorder (AMR) with its Raw setting, but even that was performing some noise suppression which ruins the acoustics of the environment. The HD Audio Recorder's sound quality left a lot to be desired, though (my V20 has Android 8.0.0 Oreo, recorder version 6.30. ![]()
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