Xiaomi Pocophone F1 128Gb+6Gb Dual LTE [64/118] Capture for unprocessed

If device implementations omit a 4 conductor 3.5mm audio jack, they:

[C-3-1] MUST have a continuous round-trip audio latency of 20 milliseconds or less.

The continuous round-trip audio latency SHOULD be 10 milliseconds or less over the USB

host mode port using USB audio class.

If device implementations include a USB port(s) supporting USB host mode, they:

[C-4-1] MUST implement the USB audio class.

If device implementations include an HDMI port, they:

[C-5-1] MUST support output in stereo and eight channels at 20-bit or 24-bit depth and

192 kHz without bit-depth loss or resampling.

5.11. Capture for Unprocessed

Android includes support for recording of unprocessed audio via the

android.media.MediaRecorder.AudioSource.UNPROCESSED audio source. In OpenSL ES, it can be accessed

with the record preset SL_ANDROID_RECORDING_PRESET_UNPROCESSED .

If device implementations intent to support unprocessed audio source and make it available to third-

party apps, they:

[C-1-1] MUST report the support through the android.media.AudioManager property

PROPERTY_SUPPORT_AUDIO_SOURCE_UNPROCESSED .

[C-1-2] MUST exhibit approximately flat amplitude-versus-frequency characteristics in the

mid-frequency range: specifically ±10dB from 100 Hz to 7000 Hz for each and every

microphone used to record the unprocessed audio source.

[C-1-3] MUST exhibit amplitude levels in the low frequency range: specifically from ±20 dB

from 5 Hz to 100 Hz compared to the mid-frequency range for each and every

microphone used to record the unprocessed audio source.

[C-1-4] MUST exhibit amplitude levels in the high frequency range: specifically from ±30

dB from 7000 Hz to 22 KHz compared to the mid-frequency range for each and every

microphone used to record the unprocessed audio source.

[C-1-5] MUST set audio input sensitivity such that a 1000 Hz sinusoidal tone source

played at 94 dB Sound Pressure Level (SPL) yields a response with RMS of 520 for 16 bit-

samples (or -36 dB Full Scale for floating point/double precision samples) for each and

every microphone used to record the unprocessed audio source.

[C-1-6] MUST have a signal-to-noise ratio (SNR) at 60 dB or higher for each and every

microphone used to record the unprocessed audio source. (whereas the SNR is measured

as the difference between 94 dB SPL and equivalent SPL of self noise, A-weighted).

[C-1-7] MUST have a total harmonic distortion (THD) less than be less than 1% for 1 kHZ

at 90 dB SPL input level at each and every microphone used to record the unprocessed

audio source.

MUST not have any other signal processing (e.g. Automatic Gain Control, High Pass Filter,

or Echo cancellation) in the path other than a level multiplier to bring the level to desired

range. In other words:

[C-1-8] If any signal processing is present in the architecture for any reason, it MUST be

disabled and effectively introduce zero delay or extra latency to the signal path.

[C-1-9] The level multiplier, while allowed to be on the path, MUST NOT introduce delay or

latency to the signal path.

Page 64 of 118