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Sampling audio | Android NDK | Android Developers
https://developer.android.com/ndk/guides/audio/sampling-audio#:~:text=In%20general%2C%20it%20is%20best%20to%20choose%20the,Use%20simple%20resampling%20ratios%20%28fixed%20versus%20interpolated%20polyphases%29
Sampling audio | Android NDK | Android Developers
https://developer.android.com/ndk/guides/audio/sampling-audio
The resampler operates in one of the following modes: 1. Fixed polyphase mode. The filter coefficients for each polyphase are precomputed. 2. Interpolated polyphase mode. The filter coefficients for each polyphase mustbe interpolated from the nearest two precomputed polyphases. The resampler is fastest in fixed polyphase …
Sample Rate Conversion | Android Open Source Project
https://source.android.com/devices/audio/src
Resamplers are used in several places in Android. For example, an MP3 file may be encoded at 44.1 kHz sample rate but needs to be played back on an Android device supporting 48 kHz audio internally. In that case, a resampler would be used to upsample the MP3 output audio from 44.1 kHz source sample rate to a 48 kHz sink sample rate used within the Android …
How to determine best audio sample rate on Android …
https://stackoverflow.com/questions/29590216/how-to-determine-best-audio-sample-rate-on-android-device
public int getBestSampleRate() { if (Build.VERSION.SDK_INT >= 17) { AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); String sampleRateString = am.getProperty(AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE); int sampleRate = sampleRateString == null ? 44100 : Integer.parseInt(sampleRateString); return …
r/Android - This is how you change the sample rate to 44.1 ...
https://www.reddit.com/r/Android/comments/73v3o6/this_is_how_you_change_the_sample_rate_to_441_khz/
Most android devices have a "native" sample rate. For some devices it is 44.1kHz, but for most modern android devices it is 48kHz. This means all the other "supported" sample rates are actually derived (by re-sampling) from this native 48kHz sample rate. Using our Hi …
Supported media formats | Android Developers
https://developer.android.com/guide/topics/media/media-formats
9 rates from 6.60 kbit/s to 23.85 kbit/s sampled @ 16kHz: FLAC: Android 4.1+ Android 3.1+ Mono/Stereo (no multichannel). Sample rates up to 48 kHz (but up to 44.1 kHz is recommended on devices with 44.1 kHz output, as the 48 to 44.1 kHz downsampler does not include a low-pass filter). 16-bit recommended; no dither applied for 24-bit. • FLAC (.flac)
Avoiding Android Mixer/48Khz upsampling of 44.1/16 audio ...
https://forum.xda-developers.com/t/avoiding-android-mixer-48khz-upsampling-of-44-1-16-audio.3933075/
When it comes to HiRes music (anything higher than 48KHz sample rate and anything 24-bit) most music apps play it correctly: Bit-perfect, without any processing or re-sampling, directly to the DAC -- exactly as audiophiles want it. A few apps are known to downsample HiRes music to Android's default sample rate of 48KHz, but those are the exception.
It's possible to change the sample rate on Android! Even ...
https://www.reddit.com/r/headphones/comments/73v1lv/its_possible_to_change_the_sample_rate_on_android/
It's possible to change the sample rate on Android! Even for internal DAC [Root] PSA. So last night I decided to dig into the Android resample problem. It is quite annoying for us android users that android quite unnecessarily has to resample the audio to 48 kHz on most phones.
Digital Audio Basics: Audio Sample Rate and Bit Depth
https://www.izotope.com/en/learn/digital-audio-basics-sample-rate-and-bit-depth.html
The most common audio sample rate you’ll see is 44.1 kHz, or 44,100 samples per second. This is the standard for most consumer audio, used for formats like CDs. This is not an arbitrary number. Humans can hear frequencies between 20 Hz and 20 kHz.
USB Digital Audio | Android Open Source Project
https://source.android.com/devices/audio/usb
Each full-speed frame carries up to 1023 bytes of payload, and a high-speed frame carries up to 1024 bytes. Putting these together, we calculate the maximum transfer rate as 1,023,000 or 8,192,000 bytes per second. This sets a theoretical upper limit on the combined audio sample rate, channel count, and bit depth. The practical limit is lower.
alsa - How to set Audio Sampling rate higher than 44.1kHz ...
https://stackoverflow.com/questions/7023821/how-to-set-audio-sampling-rate-higher-than-44-1khz-on-linux-android-platform
http://developer.android.com/reference/android/media/AudioRecord.html. sampleRateInHz: the sample rate expressed in Hertz. 44100Hz is currently the only rate that is guaranteed to work on all devices, but other rates such as 22050, 16000, and 11025 may work on some devices. SOURCE CODE. You'll find a sample code to reproduce those issues at :
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