Data Capture Lab (Windows)¶
Current Release¶
2021.1.0 (03/18/2021)¶
What’s New
Added Silicon Labs Thunderboard Sense 2 as a supported platform for data collection
Added additional validation to SSF file import
Bug Fixes
Minor stability improvements in Capture Mode
Past Releases¶
2020.10.7 (03/08/2021)¶
Bug Fixes
Fixed issue connecting to QuickAI devices using the built-in device plugin
Fixed issue in Capture Mode where devices using a serial connection would sometimes fail to disconnect properly
Minor stability improvements in Capture Mode
2020.10.6 (03/02/2021)¶
Bug Fixes
Fixed issue where capture upload would sometimes fail on operating systems in regions that use comma decimal separators
Fixed issue with capturing audio sensor data using the Simple Streaming protocol
Fixed issue with capturing audio sensor data using the MQTT-SN SD card connection method
Minor stability improvements in loading device connection status in Capture Mode
2020.10.5 (02/03/2021)¶
Bug Fixes
Fixed issue with disconnecting from a Wi-Fi connection using Simple Streaming device plugins
Minor stability improvements for Wi-Fi network connections
2020.10.4 (02/02/2021)¶
What’s New
Added the option to collect microphone data using the built-in QuickFeather Simple Stream plugin
Added the option to connect to the Arduino Nano 33 BLE Sense over Wi-Fi using the built-in device plugin
Added the option to save
device_nameas metadata from Simple Stream device firmware JSONAdded additional validation during CSV file import
Bug Fixes
Fixed issue with connecting to a microphone sensor from imported Simple Stream device plugins
Minor stability improvements in Capture Mode
2020.10.3 (01/14/2021)¶
Bug Fixes
Fixed issue with capturing sensor data from some simple streaming devices
Fixed issue where forgetting simple streaming devices would sometimes fail in Capture Mode
2020.10.2 (01/13/2021)¶
What’s New
Updated the built-in QuickFeather Simple Streaming plugin available sample rates (50, 100, 200, 250, 333)
Added additional validation to simple streaming devices in Capture Mode. During device connection the DCL now checks that data collection firmware sample rate matches the selected sample rate setting in the DCL
Added the ability to disconnect/reconnect to simple streaming devices in Capture Mode without restarting the device Note: Requires a firmware update
Bug Fixes
Fixed issue where serial port scan would sometimes fail in Capture Mode
2020.10.1 (12/17/2020)¶
What’s New
Files captured from Simple Stream devices will now start at sequence number 0
Bug Fixes
Added an error message for connecting to a Simple Stream device that has been flashed with a Knowledge Pack
Added validation for empty project files during project upload
2020.10.0 (12/10/2020)¶
What’s New
Added the option to collect data over Wi-Fi via the Simple Streaming protocol. You can learn how to implement Wi-Fi data collection in the Simple Streaming Documentation
Added a supported device plugin for the QuickFeather Simple Stream protocol
Bug Fixes
Fixed issue where sometimes the selected sensors in the Sensor Configuration screen would not display correctly
2020.9.0 (12/01/2020)¶
What’s New
Segment Explorer Improvements - Updated the segment explorer control to make it more efficient/easy to view your labeled data and update your label data in project datasets
Multi-Segment View - The segment explorer control now shows all segments in your file instead of just the selected segment in the graph. This gives much more insight to what events are happening in the file and enables much faster labeling methods. You can use the keyboard shortcuts (Ctrl + Click) and (Shift + Click) to select, edit, and delete multiple segment labels at a time
Added New Columns - New columns have been added to the segment explorer control (Length, Time, Status, Uploaded, Last Modified, UUID). Note: Hide/show columns by right-clicking on the segment headers
Length
Total number of samples in segment
Time
Total segment time length (Hours / Minutes / Seconds) based on file sample rate
Status
Server sync status (Synced with server / Saved offline / Has pending changes to be saved)
Uploaded
Date/time segment was uploaded to the server
Last Modified
Date/time segment was last modified on the server
UUID
Server unique identifier for the segment
Column Sort Feature – Added the ability to sort segment data by clicking on the column header. This is useful for finding outliers in segment data
Segment Filters – Added the ability to filter segments in the segment explorer by event. This can be used by clicking (+ Filters) at the top of the segment explorer
Multi-Segment Selection - Added the ability to select multiple segments in the graph view by either holding (Ctrl + Click) or (Shift + Click) while selected segments. Selecting segments in the graph will highlight the associated segment labels in the segment control view
Status Column - The segment status column has been updated to tell more information about your segment server status. It has three states (Green - Synced with server, Gray - Saved offline, Edit Icon - Has pending changes to be saved)
Copy - Added the ability to copy a list of selected segments into another session. (Right + Click)
Copy UUID - Added the ability to copy a list of selected Segment UUIDs to your clipboard. (Right + Click) Segment UUIDs are unique identifiers used by the server and can be used as parameters for functions in the Analytics Studio Notebook
Segments Outside of Trim Area - If you have trimmed the ends of a file and there are segments outside of the trim area they will now show as gray in the segment explorer
Keyboard Shortcuts – New keyboard shortcuts have been added to make labeling data easier. Some old keyboard shortcuts have been updated. You can find the full list of DCL keyboard shortcuts under the menu option Help → Keyboard Shortcuts
Right Arrow
Select next segment
Left Arrow
Select previous segment
Ctrl + A
Select all segments
Ctrl + E
Edit selected segment labels
Delete
Delete selected segment labels
Ctrl + H
Hide non-selected segment labels
Ctrl + M
Magnify selected segment label location
Double click segment label
Magnify selected segment location
Ctrl + F
Find segment by UUID
Ctrl + Alt + F
Find capture by UUID
Alt + A
Add new segment to the start/end of the current file
Ctrl + R
Reset graph track heights to fill screen
Right Arrow + Alt
Step forward 1 frame or 100 ms (During media playback)
Right Arrow + Alt + Ctrl
Step forward 30 frames or 1000 ms (During media playback)
Left Arrow + Alt
Step backward 1 frame or 100 ms (During media playback)
Left Arrow + Alt + Ctrl
Step backward 30 frames or 1000 ms (During media playback)
Bug Fixes
Fixed issue with deleting Simple Streaming Interface Device Plugins
2020.8.0 (10/27/2020)¶
What’s New
Added a new protocol for custom firmware data collection called the Simple Streaming Interface. This allows for quicker prototyping with your custom device firmware
See the documentation for Adding Custom Device Firmware for more information on the protocols we support and how to implement your device firmware
Added Arduino Nano33 BLE Sense as a supported platform for data collection
Enabled the QuickFeather microphone sensor for data collection
2020.7.3 (09/23/2020)¶
What’s New
Minor improvements to enhance user experience
Bug Fixes
Fixed issue where sometimes project upload status was not getting refreshed
2020.7.2 (09/17/2020)¶
What’s New
Updated Starter Edition to no longer have a license time limit. Note: Starter Edition is limited to 2500 segments per project and must be logged in to add new data to a project
2020.7.1 (08/19/2020)¶
What’s New
Added sample rates 210hz, 400hz, and 600hz to QuickFeather data collection options. Note: The MC3635 accelerometer in QuickFeather has a +/- 10% tolerance in the internal clock used to set sample rate. This means setting a sample rate of 400Hz can result in captured sensor data varying from board to board within a range of 360Hz – 440hz. This sensor limitation should be understood and factored in your models for applications where sample timing sensitivity is critical.
2020.7.0 (08/12/2020)¶
What’s New
Added QuickLogic QuickFeather as a supported platform for data collection
2020.6.1 (07/20/2020)¶
Bug Fixes
Fixed issue with sensors not loading correctly in sensor configuration screen
2020.6.0 (07/15/2020)¶
What’s New
Added ST SensorTile.Box as a supported platform for data collection
Added the ability to use external third-party devices for data collection within the Data Capture Lab. For more details on this feature, see the following tutorial: How to Import a Device Plugin
2020.5.0 (05/26/2020)¶
What’s New
Performance Improvements - Added improvements to saving/uploading metadata and segments in the following areas of the DCL (up to 20x-100x faster depending on your project size)
Upload project
File Import -> DCLI format
File Import -> QLSM format
Open Capture -> Metadata Add/Update/Delete
Open Capture -> Segment Add/Update/Delete
Open Capture -> Detect Segments
Project Explorer -> Copy Segments
Project Explorer -> Copy Session
Project Explorer -> Edit Metadata
Auto Sync -> Syncing offline metadata/segments with the server
Auto Sync -> Syncing server metadata/segments with your local machine
Added ability to load/save segments in Auto Sessions offline
Added new graphing tool called Segment Width Lock. The Segment Width Lock toggle gives you the ability to lock the segment width during location placement so that you can move an entire segment at one time instead of just the start or end of the segment
Bug Fixes
Fixed issue where the Max Capture Time setting would sometimes show an error in Capture mode when auto-saving sensor data over BLE streaming connections
2020.4.0 (05/04/2020)¶
What’s New
WAV File Updates
Added support for WAV file upload/download on SensiML Servers
Added multi-channel support on WAV files
Note: WAV file updates are only supported in new projects created with DCL v2020.4.0 or later
Performance Improvements
Added improvements to load times in the following areas (up to 20x faster depending on your project size)
Project → Download
Project → Open
Project → Sync
Capture File → Open
Find Capture By UUID
Added option to lookup a capture by UUID in menu item Edit → Find
Bug Fixes
Fixed issue with Session → Delete not refreshing segment totals in Project Explorer
Minor stability fixes
2020.3.1 (04/14/2020)¶
What’s New
Added format selection screen to DCLI file import
Added new validation checks to DCLI file import
Updated UX for all import file options to be more intuitive
Added a cancel button to File → Upload progress dialog
Added option to lookup a segment by UUID in menu item Edit → Find
Bug Fixes
Fixed issue with renaming Project Property labels with different letter casing
Fixed issue with switching to Label mode in the middle of recording a file in Capture mode
Minor stability fixes
2020.3.0 (03/02/2020)¶
What’s New
Added feature to export metadata/segments into .dcli file format
This can be found in the Project Explorer: Select a list of files → Right + Click → Export
Added feature to import auto sessions via .dcli format
Updated Project Properties → Segment Labels tab to show segment labels by default instead of segment groups. In order to change this back to show segment groups open the Advanced tab and click Enable segment label groups
Improved Copy Segments performance
Updated SaaS license agreement
Bug Fixes
Fixed project sync issue where sometimes loading capture files would fail
Fixed threading issue with Save Changes button
Fixed issue where disabling Import → Index column setting would sometimes not work correctly
Fixed issue where deleting Project Properties offline would sometimes not work correctly
Fixed issue where uploading a project via Project Upload would sometimes not clear dependencies correctly
Minor stability fixes
2020.2.0 (02/06/2020)¶
What’s New
Import Upgrades
Added feature for importing metadata and segments from outside sources via a new file format (.dcli)
For more details see the Importing External Sensor Data tutorial
General usability improvements
Minor UI improvements
Bug Fixes
Fixed issue with track settings sometimes not saving
Minor stability fixes
2020.1.0 (01/14/2020)¶
What’s New
Capture mode - Added support for MQTT-SN data collection with QuickAI
Bug Fixes
Fixed issue with collecting data from QuickAI and Chilkat when Windows language setting is not set to English
Fixed issue with selected files in the Project Explorer changing when switching between Capture and Label mode
Minor stability fixes
2019.5.0 (12/10/2019)¶
What’s New
Project Explorer Upgrades
Added metadata columns to the project explorer
Added ability to sort files by metadata column
Moved Import Files button to menu File → Import Files…
Moved Project Properties button to menu Edit → Project Properties
Added a status window when deleting files
Improved performance of Import and Delete operations on files
Added selected file count to the project explorer
Added the ability to group by metadata columns
The group by metadata feature can be found in Project Explorer → Preferences
Added Expand all/Collapse all button for expanding/collapsing metadata groups
General Updates
Added Keyboard Shortcut screen. This can be found under menu Help → Keyboard Shortcuts
Added a progress bar for longer file operations (File upload, download, delete, sync)
Added subscription tier to startup screen
Minor bug fixes
2019.4.3 (11/20/2019)¶
Bug Fixes
Fixed issue where importing external CSV files would fail in some scenarios
Minor bug fixes
2019.4.0 (11/12/2019)¶
What’s New
Project Architecture Updates
Refactored project architecture
- .dclproj files created before v2019.4.0 will be upgraded to the new format when you open your project. A backup of your original .dclproj file will be saved to your computer
- .dcl, .sdcl, label.config, and builder.dclseg files were deprecated with this update. These files will also be backed up when you convert your .dclproj file to the new format, but they are no longer used
General performance improvements
Changed behavior of project properties screen. Adding, updating, or deleting project properties now updates the entire project
Project Explorer Menu Options
Added the ability to compare multiple files in the same graph
Added the ability to edit metadata from Project Explorer
Added the ability to copy segments from multiple files to another session
Added the ability to use selected files to find a segmenter algorithm by using the Generate auto session button
Segment totals are now based on the current session
Segment totals now include offline segments
Session Menu Options
Added the ability to create a new copy of a session
Replaced Segmenter Builder mode. You can now use any existing session as your training data set. Click Generate auto session inside the Project Explorer to use a session for finding a segmenter.
Added the ability to view all files that have been labeled in a session together in the same graph
General
Switching video file views retains the previous video position
Video file locations are now saved as relative paths instead of absolute paths
Added an expand track button to the graphing tool
Enabled data collection for AD7476 on QuickAI
2019.3.2 (10/22/2019)¶
What’s New
Created a read-only version of DCL for opening and viewing project data sets without an active subscription. This version cannot create or modify projects
Added a checkbox to the Import Files screen to disable auto-upload
2019.3.1 (09/24/2019)¶
What’s New
Added ability to sort columns in the project explorer
Added ‘MagnitudeAllColumns’ transform to the auto-session parameters
Moved capture collection methods dropdown into the main Capture window
Bug Fixes
Fixed issue with opening a project that contained a session where the segmenter no longer exists
2019.3.0 (07/30/2019)¶
What’s New
Capture mode - Added new supported capture device SensorTile
Supported Frequencies: 26hz, 52hz, 104hz, 208hz, 416h
2019.2.3 (07/18/2019)¶
What’s New
Added ability to set max record time limit in Capture mode. This setting can be found in the main DCL Settings → Max Record Time
Bug Fixes
Fixed issue with Session → Clear button not clearing empty segments
Fixed issue with Session → Detect button not clearing empty segments
2019.2.2 (07/02/2019)¶
What’s New
Added ability to save metadata properties on files recorded via QuickAI SD card
Note: Must import .qlsm files through the project where the files were captured
Added ability to lock Y-Axis range and set Y-Axis minimum and maximum bounds
Deprecated SegmentID labels. This speeds up Create/Update/Delete actions by 2x on Segment modifications
Added clear error message for expired login credentials
Bug Fixes
Minor stability fixes
2019.2.1 (06/18/2019)¶
What’s New
Moved Label Config tab to Project Explorer → Project Properties screen
Updated metadata and label configuration UX to be more intuitive
Added ‘Segments on Cloud’ feature to the Project Explorer. This shows the total number of segments in a capture file
Added a segment length property shown above the graph in the Label Explorer
Bug Fixes
Fixed off-by-one error in ‘Default Segment Length’ setting
Minor stability fixes
2019.2.0 (06/11/2019)¶
What’s New
Added support for capturing sensor data from QuickLogic Chilkat devices
Bug Fixes
Fixed issue with QuickAI device not releasing resources correctly on BLE disconnect
Fixed display issue on capture sensor configuration screen
2019.1.2 (05/21/2019)¶
What’s New
Project Explorer Upgrades
Added ability to select multiple files in the Project Explorer
Important Behavior change (Open File) → To open a file in the project explorer double click the file name
Added ability to Upload, Download, and Delete multiple selected files at the same time
Right-Click on a file name in the Project Explorer to see Upload, Download, and Delete menu options
Moved ‘Upload Files To Cloud’ button into the project explorer menu options (Upload)
Moved ‘Download Files From Cloud’ button into the project explorer menu options (Download)
New keyboard shortcuts in Project Explorer:
SHIFT + Click
Select multiple consecutive files
CTRL + Click
Select multiple non-consecutive files
CTRL + A
Select all files
Import File Screen
Added check/conversion options for Signed/Unsigned data from .qlsm files
Bug Fixes
Fixed localization error with saving estimated (calculated) sample rate during capture mode
Added validation rules to label configuration screens
2019.1.1 (05/08/2019)¶
What’s New
Added a max file size limit while recording in capture mode
Added max throughput configuration check for Mayhew LTC1859
Removed unsupported Mayhew LTC1859 channel configuration parameters (0-5V Single-Ended, 0-10V Single-Ended, 0-5V Differential, 0-10V Differential)
Bug Fixes
Fixed error with restarting QuickAI device while recording in capture mode
Fixed scenario where ‘Device’ metadata property was sometimes cleared
2019.1.0 (05/05/2019)¶
What’s New
Capture mode - Enabled high frequency sample rates on QuickAI (208, 416, 832, 1660)
Note: High frequency sample rate files are saved to SD card
Capture mode - Enabled Audio on QuickAI
Note: Audio files are saved to SD card
Capture mode - Enabled Mayhew LTC1859 on QuickAI
Note: Mayhew LTC1859 files are saved to SD card
Added new supported file type (.qlsm)
Added ability to create multiple sensor configurations on a project
Added ability to set sensor configurations when importing external files
Updated sample rate to be pulled from sensor configurations
Bug Fixes
General stability improvements to capture mode
2.5.0 (04/10/2019)¶
What’s New
Multi-Sensor Graphing
Added ability to split sensor data columns graph into multiple tracks
Added ability to change graph height
Added ability to change order of tracks
Added ability to trim the start/end points in a CSV or WAV file
Media Player Updates
New UX for media player
General stability improvements
Added option to Float / Dock media player
Added time display for current sensor data location
Added time display for video location and total video length
Added ability to trim the start/end points in a video file
Added keyboard shortcuts for media playback
Spacebar
Play/Stop video or audio file
Right Arrow
Step forward 1 frame
SHIFT + Right Arrow
Step forward X frames (set in DCL settings screen)
Left Arrow
Step backward 1 frame
SHIFT + Left Arrow
Step backward X frames (set in DCL settings screen)
Multiple Manual Segmenters (Sessions)
Added ability to create multiple manual segmenters
Added ability to customize manual segmenter names
Added ability to use Delete/Clear buttons with manual segmenters
Added new button ‘Copy’ to copy segments from one segmenter to another
Added option in Capture mode to select a segmenter session while capturing files
General Updates
Added better support for low screen resolutions
Added display for total sensor file length
Added File → Close File menu option
Added Help → Check for Updates menu option
Moved sample rate control into the Metadata tab
Moved toggle for packet loss annotations into DCL application settings
Minor UX improvements
Bug Fixes
Fixed issue in capture mode where last used device would sometimes fail to connect
Fixed issue in capture mode with estimated sample rate not being saved
Fixed issue in Open Project screen where project names that have an underscore were not displaying properly
Fixed issue in Label Mode with Segment Overview Control sometimes not displaying labels
Other minor bug fixes
2.4.0 (02/26/2019)¶
What’s New
Capturing audio data on Nordic Thingy now saves to WAV instead of CSV
Enabled QuickAI low frequency sample rates (26hz, 52hz)
Improved performance of Auto-Segmenters in DCL
Added support for upcoming server release
Bug Fixes
Fixed an invalid parameter in some auto-segmenter algorithms
Fixed sample rate when capturing Nordic Thingy audio (Changed from 8kHz to 16kHz)
Fixed issue when resolving a merge conflict between two labels would sometimes not save the segmenter
Fixed issue with creating a custom project schema while importing external captures files that have a ‘sequence’ column
Added user friendly error message for files with corrupted sensor data in a row
2.3.0 (09/26/2018)¶
What’s New
Major Features
Added a timer while recording sensor data in Capture mode
Added a service to check for the latest version on startup
Minor Features
Updated ‘Sensor Select’ in the graphing control to always remember the last selected sensor columns
Changed the default behavior for labeling multiple file metadata and segments
Bug Fixes
Fixed bug with ‘Auto add label’ checkbox on the segment label screen not always remembering the last selected label
Fixed bug that sometimes causes an error when switching out of Capture mode while recording
2.2.1 (09/10/2018)¶
Bug Fixes
Fixed issue where QuickAI sample rate metadata was saved as 100hz instead of 104hz
2.2.0 (08/30/2018)¶
What’s New
Major Features
Added new supported device - QuickAI
Added feature to remember the last connected device in Capture mode
Refactored device plugin architecture
Added new feature in the Project Explorer for importing external sensor data files into the DCL
Minor Features
Added ‘Open in Explorer’ option when you right-click on a file in the Project Explorer. This opens the selected file in Windows Explorer
Moved ‘CSV Time Column’ and ‘Sample Rate’ settings from the Application Settings screen into the new import settings screen. These settings are used when importing external files to a project
Removed relative ‘CaptureFiles’ paths from the .dclproj file. The DCL now automatically loads all files in the /data/ directory
The Label Config screen now trims extra white space from the end of labels to ensure consistent labeling
Bug Fixes
.WAV column name updated from ‘Channel_0’ to ‘Microphone’. When collecting audio files through the DCL the column was saved as Microphone, but if you opened a .WAV file the column would load as ‘Channel_0’ which caused a mismatch on the server
Fixed minor issue where sometimes the plugin configuration would not load correctly, causing the ‘Save Changes’ button to appear even though there were no changes made
Fixed issue where vertical videos would playback in horizontal mode
Removed unsupported sensors from Nordic Thingy data sensor configuration screen
2.1.4¶
What’s New
Minor Features
Combined the Activity/Metadata tabs on the capture screen
Updated desktop DCL icon to match mobile DCL icon
Added ability to set ‘Default Segment Length’ when you add a segment via single right click on the graph
Bug Fixes
Fixed issue with adding a new segmenter algorithm when there are unsaved segment changes
2.1.2¶
What’s New
Major Features
Device plugin configuration is now saved to the cloud
Bug Fixes
Fixed issue in the Project Explorer where ‘Try again’ upload option would appear on files that have not been linked locally
2.1.1¶
What’s New
Major Features
Added support for capturing audio data from Nordic Thingy
Note: Currently saves raw data in CSV format
Minor Features
Added ability to rename capture files in the project explorer
Updated remove capture feature to delete capture in the project explorer
Bug Fixes
Fixed issue with extra fields being saved to segment file (NoBinding fields)
2.1.0¶
What’s New
Major Features
Added Nordic Thingy as a supported capture device
Created new ‘Open Project’ screen
Added ‘Recent Projects’ list feature. The DCL remembers the most recently opened projects to allow for quick access the next time opening the DCL
Added ‘Remember me’ capability to the login screen
Added ability to use Magnitude transforms on auto-segmenter columns
Minor Features
Updated capture mode to automatically adds files to a project
Updated capture mode to use the label configuration
Bug Fixes
Fixed issue with Toast notifications appearing on wrong monitor if PC is docked to multiple monitors
2.0.2¶
What’s New
Minor Features
Save project from cloud now saves the label configuration
Added better error messages when deserializing label configuration
2.0.1¶
What’s New
Major Features
Added ability to download project and capture data from cloud to local hard drive
Minor Features
Added ability to clear auto-generated segments on a capture file
Bug Fixes
Fixed display issue with video playback
Fixed unexpected error when clicking on segment line inside the Segmenter Builder
Fixed issue with empty .sdcl files
2.0.0¶
What’s New
WAV File Support
Added ability to add .WAV files to a project
Added ability to segment and play .WAV files
Added ability to save a .WAV file as CSV
Auto Segmenters
Added ability to create multiple auto-segmenters for a project
Added ability to view segments generated by auto-segmenters
General Updates
Added Y-Axis to label mode graph
Created ‘Segmenter Builder’ feature - Allows user to select “ideal” segments to automatically find a segmenter for generating segments
Created Label Config - New feature for labeling Segments/Metadata. Makes typo errors less likely. Replaces ‘Default Labels/Default Metadata’
Created ‘Segment Overview’ - Allows user to quickly tab through segments on a file to see basic segment label summary
Minor Features
Segment double click - Added ability to double click on a segment to have the graph zoom into the segment
Adjust offset feature - Adds ability to drag the blue offset line to the correct location while playing videos
Cloud sample rate - Sample rate now is saved to both local captures and cloud captures
Calculated sample rate - New feature for keeping video files in sync with raw data
Loading capture file - Loading ‘Cloud only’ project files is now significantly faster
Uploading capture file - Uploading new files to the cloud is now significantly faster
Add video feature - Added buttons for for adding/removing a video to play with a raw capture file
Show packet loss gaps - Added a checkbox for making packet loss gaps visible as gray boxes in the graph
Show Line Point Markers - Added a checkbox to show exact sensor amplitude values when hovering over graph points
Limitations
Audio features - Audio must be in .WAV format, 16 bit, and 16 kHz sampling rate