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Near-Ultrasound audio is the 18.5 kHz to 20 kHz band.
Device implementations:
MUST correctly report the support of near-ultrasound audio capability via the
AudioManager.getProperty API as follows:
If PROPERTY_SUPPORT_MIC_NEAR_ULTRASOUND is "true", the following requirements MUST be met
by the VOICE_RECOGNITION and UNPROCESSED audio sources:
[C-1-1] The microphone's mean power response in the 18.5 kHz to 20 kHz band MUST be
no more than 15 dB below the response at 2 kHz.
[C-1-2] The microphone's unweighted signal to noise ratio over 18.5 kHz to 20 kHz for a
19 kHz tone at -26 dBFS MUST be no lower than 50 dB.
If PROPERTY_SUPPORT_SPEAKER_NEAR_ULTRASOUND is "true":
[C-2-1] The speaker's mean response in 18.5 kHz - 20 kHz MUST be no lower than 40 dB
below the response at 2 kHz.
7.9. Virtual Reality
Android includes APIs and facilities to build "Virtual Reality" (VR) applications including high quality
mobile VR experiences. Device implementations MUST properly implement these APIs and
behaviors, as detailed in this section.
7.9.1. Virtual Reality Mode
Android includes support for VR Mode , a feature which handles stereoscopic rendering of
notifications and disables monocular system UI components while a VR application has user focus.
7.9.2. Virtual Reality Mode - High Performance
If device implementations support VR mode, they:
[C-1-1] MUST have at least 2 physical cores.
[C-1-2] MUST declare the android.hardware.vr.high_performance feature.
[C-1-3] MUST support sustained performance mode.
[C-1-4] MUST support OpenGL ES 3.2.
[C-1-5] MUST support android.hardware.vulkan.level 0.
SHOULD support android.hardware.vulkan.level 1 or higher.
[C-1-6] MUST implement EGL_KHR_mutable_render_buffer ,
EGL_ANDROID_front_buffer_auto_refresh , EGL_ANDROID_get_native_client_buffer ,
EGL_KHR_fence_sync , EGL_KHR_wait_sync , EGL_IMG_context_priority , EGL_EXT_protected_content
, EGL_EXT_image_gl_colorspace , and expose the extensions in the list of available EGL
extensions.
[C-1-8] MUST implement GL_EXT_multisampled_render_to_texture2 , GL_OVR_multiview ,
GL_OVR_multiview2 , GL_OVR_multiview_multisampled_render_to_texture , GL_EXT_protected_textures
, GL_EXT_EGL_image_array , GL_EXT_external_buffer , and expose the extensions in the list of
available GL extensions.
[C-1-24] MUST implement VK_KHR_shared_presentable_image , VK_GOOGLE_display_timing and
expose the extensions in the list of available Vulkan extensions.
Page 110 of 132
Содержание
- Compatibility definition p.1
- Android 9 p.1
- Native api compatibility p.2
- Managed api compatibility p.2
- Introduction p.2
- Handheld requirements p.2
- Document structure p.2
- Device types p.2
- Device configurations p.2
- Background restriction p.2
- Web compatibility p.2
- Automotive requirements p.2
- Watch requirements p.2
- Api namespaces p.2
- User interface compatibility p.2
- Api behavioral compatibility p.2
- Television requirements p.2
- Android library p.2
- Tablet requirements p.2
- Android extensions p.2
- Software p.2
- Soft api compatibility p.2
- Runtime compatibility p.2
- Secure media p.3
- Developer options p.3
- Quick settings p.3
- Companion device pairing p.3
- Professional audio p.3
- Capture for unprocessed p.3
- Network protocols p.3
- Audio recording p.3
- Musical instrument digital interface midi p.3
- Audio playback p.3
- Multimedia compatibility p.3
- Audio latency p.3
- Media ui p.3
- Application packaging compatibility p.3
- Media codecs p.3
- Accessibility p.3
- Managed user support p.3
- Instant apps p.3
- Heavyweight apps p.3
- Hardware compatibility p.3
- Video encoding p.3
- Display and graphics p.3
- Video decoding p.3
- Device administration p.3
- Tv input framework p.3
- Developer tools and options compatibility p.3
- Text to speech p.3
- Developer tools p.3
- Sensors p.4
- Pose sensor p.4
- Memory and storage p.4
- Input devices p.4
- Data connectivity p.4
- Cameras p.4
- Updatable software p.5
- Software compatibility testing p.5
- Security model compatibility p.5
- Performance and power p.5
- Document changelog p.5
- Contact us p.5
- Requirements by device type p.6
- Requirement id p.6
- Introduction p.6
- Document structure p.6
- Requirement id in section 2 p.7
- Hardware p.7
- Handheld requirements p.7
- Device types p.7
- Device configurations p.7
- Multimedia p.10
- Software p.11
- Performance and power p.12
- Television requirements p.13
- Security model p.13
- Hardware p.14
- Multimedia p.15
- Software p.16
- Performance and power p.17
- Watch requirements p.18
- Software p.18
- Multimedia p.18
- Hardware p.18
- Performance and power p.19
- Hardware p.19
- Automotive requirements p.19
- Software p.22
- Multimedia p.22
- Performance and power p.23
- Tablet requirements p.24
- Software p.24
- Security model p.24
- Hardware p.24
- Managed api compatibility p.25
- Android library p.25
- Android extensions p.25
- Soft api compatibility p.26
- Permissions p.26
- Build parameters p.26
- Intent compatibility p.29
- Activities on secondary displays p.31
- Application binary interfaces p.32
- Native api compatibility p.32
- Bit arm native code compatibility p.33
- Webview compatibility p.34
- Web compatibility p.34
- Browser compatibility p.34
- Api behavioral compatibility p.35
- Api namespaces p.36
- Background restriction p.36
- Runtime compatibility p.37
- User interface compatibility p.39
- Launcher home screen p.39
- Widgets p.40
- Notifications p.40
- Search p.42
- Alerts and toasts p.42
- Themes p.43
- Live wallpapers p.43
- Lock screen media control p.44
- Input management p.44
- Activity switching p.44
- Screen savers previously dreams p.45
- Multi windows p.45
- Location p.45
- Unicode and font p.45
- Display cutout p.46
- Device administration p.46
- Device provisioning p.47
- Managed profile support p.48
- Text to speech p.49
- Managed user support p.49
- Accessibility p.49
- Tv input framework p.50
- Quick settings p.50
- Media ui p.50
- Instant apps p.50
- Heavyweight apps p.51
- Companion device pairing p.51
- Application packaging compatibility p.51
- Multimedia compatibility p.52
- Media codecs p.53
- Audio encoding p.53
- Audio decoding p.53
- Audio codecs details p.54
- Image encoding p.55
- Image decoding p.55
- Video codecs list p.56
- Video codecs p.56
- Image codecs details p.56
- Video encoding p.57
- Video decoding p.59
- Mpeg 4 p.59
- Mpeg 2 p.59
- H 65 hevc p.60
- Raw audio capture p.61
- Audio recording p.61
- Capture for voice recognition p.62
- Capture for rerouting of playback p.62
- Raw audio playback p.63
- Audio playback p.63
- Audio output volume p.63
- Audio latency p.63
- Audio effects p.63
- Network protocols p.65
- Secure media p.66
- Professional audio p.66
- Musical instrument digital interface midi p.66
- Capture for unprocessed p.68
- Developer tools and options compatibility p.69
- Developer tools p.69
- Display and graphics p.71
- Developer options p.71
- Hardware compatibility p.71
- Screen configuration p.72
- Screen orientation p.74
- Display metrics p.74
- D and 3d graphics acceleration p.74
- Secondary displays p.77
- Screen technology p.77
- Legacy application compatibility mode p.77
- Non touch navigation p.78
- Navigation keys p.78
- Keyboard p.78
- Input devices p.78
- Touchscreen input p.79
- Fake touch input p.80
- Game controller support p.81
- Remote control p.82
- Sensors p.82
- Accelerometer p.83
- Magnetometer p.84
- Gyroscope p.86
- Thermometer p.87
- Photometer p.87
- Barometer p.87
- Proximity sensor p.88
- High fidelity sensors p.88
- Biometric sensors p.90
- Android automotive only sensors p.92
- Telephony p.93
- Pose sensor p.93
- Data connectivity p.93
- Ieee 802 1 wi fi p.94
- Bluetooth p.97
- Near field communications p.98
- Minimum network capability p.100
- Sync settings p.101
- Secure elements p.101
- Rear facing camera p.101
- Data saver p.101
- Cameras p.101
- Front facing camera p.102
- External camera p.103
- Camera api behavior p.103
- Memory and storage p.104
- Camera orientation p.104
- Minimum memory and storage p.105
- Application shared storage p.105
- Usb peripheral mode p.106
- Adoptable storage p.106
- Usb host mode p.107
- Microphone p.108
- Audio output p.108
- Near ultrasound p.109
- Virtual reality mode high performance p.110
- Virtual reality mode p.110
- Virtual reality p.110
- User experience consistency p.112
- Power saving modes p.112
- Performance and power p.112
- File i o access performance p.112
- Power consumption accounting p.113
- Consistent performance p.113
- Security model compatibility p.114
- Permissions p.114
- Filesystem permissions p.115
- Uid and process isolation p.115
- Multi user support p.116
- Alternate execution environments p.116
- Security features p.117
- Premium sms warning p.117
- Usage history p.119
- Recording p.119
- Privacy p.119
- Network traffic p.120
- Data storage encryption p.120
- Connectivity p.120
- File based encryption p.121
- Direct boot p.121
- Full disk encryption p.122
- Device integrity p.122
- Keys and credentials p.123
- Secure lock screen p.124
- Strongbox p.127
- Safe boot mode p.128
- Data deletion p.128
- Subscription plans p.129
- Software compatibility testing p.129
- Compatibility test suite p.129
- Automotive vehicle system isolation p.129
- Updatable software p.130
- Cts verifier p.130
- Document changelog p.131
- Changelog viewing tips p.131
- Contact us p.132
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