News

PlatterSpeed iOS 2.2

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2 years ago

We just released the new version 2.2 of PlatterSpeed for iOS. With this new version, WOW measurement according to DIN IEC 386 (formerly DIN 45507) and archiving of frequency charts is now also available on iOS devices. Please note that … Continue reading

PlatterSpeed Android 2.1.1

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2 years ago

With the new version 2.1.1, PlatterSpeed’s wow measurement in accordance to DIN IEC 386 (an in-app purchase) has been improved to better match Adjust+. Both methods are supported: 2-Sigma and dynamic.

PlatterSpeed iOS 2.1.1

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2 years ago

PlatterSpeed for iOS has been updated to make use of the 4″ Retina display on the new iPhone 5. Due to popular user request, PlatterSpeed iOS now additionally supports the use of a 1kHz signal to measure the speed – … Continue reading

PlatterSpeed Android 2.1.0

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3 years ago

With the new version 2.1.0, PlatterSpeed has got a dedicated main GUI optimized for tablets! Here’s a screenshot of the main measuring view:

PlatterSpeed iOS 2.1

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3 years ago

PlatterSpeed for iOS’s speed view GUI now has also been completely redesigned with the same new colored graphical indicator and a bigger realtime chart as the Android version introduced back in March.

FAQ

Common (5)

Why does the frequency fluctuate periodicaly in the chart?

The main periodic fluctuation of the frequency in the chart is mainly caused by the excentricity of the record. The cycle time for this type of fluctuation is 1.8s for 33.3 RPM and 1.33s for 45 RPM. This type of fluctuation could be filtered using a sharp notch filter, which on the other hand would cause loosing ‘real’ fluctuation in the filtered band too.

How accurate is WOW measurement?

The WOW measurement according to DIN IEC 386 is quite accurate in measuring relatively slow speed fluctuations in a range of <10Hz (WOW). Faster variations (flutter) are a problem to measure with a phone because audio can be sampled at a maximum rate of 44.1kHz which is limiting the measurement of fast fluctuations. Please put the device on a solid base for measurement in order to avoid shaking it which causes some minimal doppler effects and decreases the accuracy.
You can achieve better results by using our PC software Adjust+ (see www.adjust-plus.com)

What’s the DIN IEC 386 function for?

PlatterSpeed calculates the wow of your turntable in accordance to DIN IEC 386 (formerly DIN 45507), using both the 2-sigma and the dynamic weighting method. Expensive special equipment was needed before to have all these possibilities! Please note that this functionality is optional and can be bought as an In-App Purchase.

The frequency doesn’t get ‘locked’ properly – why?

  • The most simple reason: the input level might be be too low, so try to turn up the volume slightly
  • The might be some external noise around you – so try to keep your environment as quiet as possible during the measurement
  • Mainly on Android, we saw devices with a lowpass filter integrated into the microphone with a cut-off frequency as low as 3.5 kHz. This causes problems at 33.3 RPM an makes it impossible to calibrate 45 RPM. Try to use a 1 kHz track instead of 3.15 kHz for calibration (Android only).

What is the ‘lowpass-filtered frequency’ in the frequency chart?

Because the frequency fluctuates somewhat with each single turn of the record, the fast components of the frequency chart are filtered to eliminate the influence of the record’s excentricity. What remains is the (relatively) long term deviation of the frequency which is mainly caused by the record player.

Version History (iPhone / iPad)

v2.2 – Released on 05/03/2013
  • In-App Purchase: WOW calculation according to DIN IEC 386 (formerly DIN 45507)
  • In-App Purchase: frequency chart archive (save/load charts on device)
  • show current recording time
  • several fixes and improvements
v2.1.1 – Released on 11/17/2012
  • added support for 4-inch Retina display of iPhone 5
  • fixed autorotate for iPad on iOS 6
  • minor fixes for iOS 6
  • allow a 1000 Hz signal to be used for adjustment
v2.1 – Released on 04/19/2012
  • complete GUI redesign of main speed view with colored graphical realtime speed indicator and bigger realtime frequency chart with line for desired speed
  • support for Retina display on iPad
v2.0 – Released on 09/30/2011
  • now with recording of the frequency data!
  • new graphical chart of the recorded frequency data!
  • numerical evaluation of the recorded frequency chart
  • a lot of minor fixes and improvements
v1.2 – Released on 03/02/2011
  • now universal app for iPhone + iPad, uses the iPad’s larger screen
  • minor fixes
v1.1 – Released on 02/18/2011
  • complete redesign of the user interface
  • frequency graph in main view (frequency vs. time)
  • introduced playing of demo track
v1.0 – Released on 01/27/2011
  • initial release

Version History (Android)

v2.1.1 – Released on 04/05/2013
  • improved DIN IEC 386 wow evaluation (in-app purchase) to better match Adjust+
  • show current recording time
  • minor fixes
v2.1.0 – Released on 04/22/2012
  • added support for dedicated tablet main screen GUI optimized for large displays
  • various minor fixes and improvements
v2.0.0/v2.0.1 – Released on 03/27/2012
  • complete GUI redesign of main speed view with colored graphical realtime speed indicator and bigger realtime frequency chart with line for desired speed
  • added wow calculation in accordance of DIN IEC 386 (formerly DIN 45507) as in-app purchase
  • added preferences view
  • permission “com.android.vending.BILLING” is now needed for in-app purchases
  • v2.0.1: fixed crash of v2.0.0 on Android 2.2 (FROYO)
v1.5.1 – Released on 02/02/2012
  • GUI redesign with ActionBar, compatible with ICS and earlier Android versions
v1.5.0 – Released on 01/04/2012
  • added file management functions for saved measurements/charts (delete + rename)
  • frequency chart is now opened using the menu button
  • added installation of demo chart if no measurement is present yet
  • added longer demo track (30s now)
  • a lot of minor fixes and improvements
v1.4.3 – Released on 09/28/2011
  • fixed force close at startup on some devices – sorry for that!
v1.4.2 – Released on 09/28/2011
  • fixed behavior for start recording dialog (is now less sensible)
v1.4.1 – Released on 06/05/2011
  • alternatively allow usage of a 1000Hz track for devices with poor microphones
v1.4.0 – Released on 06/03/2011
  • added new view showing graphical frequency charts (frequency vs. time) and statistics
  • save/load charts
  • repeated toast showing 10s frequency average
  • repeated toast showing 10s frequency average
  • needs permission WRITE_EXTERNAL_STORAGE to save frequency charts
v1.3.0 – Released on 03/08/2011
  • added audio input level meter
v1.2.0 – Released on 02/09/2011
  • complete redesign of the user interface
  • frequency graph in main view (freq. over time)
  • introduced demo mode thru menu
v1.1.0 – Released on 01/16/2011
  • improved accuracy of measurement
  • much less CPU load (due to signal processing done in NDK now)
  • better responsiveness
  • new design
  • new icon
v1.0.0 – Released on 12/31/2010
  • initial release

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