About OTOTETSU
When electric trains accelerate and decelerate, we can hear some characteristic sounds, which is caused by inverters' controlling the torque and the rotational speed of the motors. This app simulates the waveforms...
When electric trains accelerate and decelerate, we can hear some characteristic sounds, which is caused by inverters' controlling the torque and the rotational speed of the motors. This app simulates the waveforms generated by inverters and sounds coming from motors, and you can also design sounds of imaginary trains.
Version History - Modified the method for copying inverter configuration patterns. 1.9.2 12/18/2025 - You can now copy and paste inverter configurations. 1.9.1 06/23/2025 - Spread spectrum can now be applied to the injected high frequency signal in asynchronous mode. - Third harmonic injection is now available. - Added a feature of inverting carrier phase. 1.9.0 05/12/2025 - Modulation index can now be set manually. - Tweaked PWM waveform generation in the wide 3-pulse mode of 2-level inverters. - Reduced the minimum number of teeth on the pinion to 5. - Fixed an issue that prevents the patterns A / B from being switched on iPadOS 18. 1.8.0 02/18/2025 - Fixed an issue with high frequency signal injection. - Fixed an issue where the dipolar bias in synchronous mode with 3-level inverters is not applied. 1.7.1 08/26/2024 - It is now possible to simulate SHE-PWM and CHM-PWM for the synchronous mode. - Added a feature to play rail joint sound and rolling noise. 1.7.0 08/24/2024 - Added a feature of high frequency signal injection. - Some new types of spread spectrum are now available. - Fixed an issue that sometimes prevented the app from working after returning from background. 1.6.0 01/18/2023 - Fixed an issue that prevented the app from working after Siri was used. 1.5.2 10/14/2022 - 3-level inverters can now be simulated. - Added a mode that displays information such as acceleration and driving distance. - Added a new feature that enables the running resistance to affect the train speed. - It is now possible to apply a filter to the inverter sound. - Improved the quality of sound. - Updated UI design. 1.5.1 02/22/2022 - Added the mode that enables one to control the train speed with the interface like a power and brake lever. - The train speed can now be modified by a drag operation on the speed meter. - Removed the speed controlling slider. - Improved the sound from motors and gears. 1.5.0 01/11/2022 - Each configuration can now contain two patterns of inverter modes. - Improved the sound from motors and gears. 1.4.0 10/26/2021 - Added a switch to enable and disable overmodulation in Train Configuration. - Improved PWM waveform generation at some pulse modes. 1.3.1 09/04/2021 - Added analog speed meter design. - Added a switch for turning the inverter sound on and off. - Added a new feature that simulate train noise. - Raised the miximum speed to 160 km/h. - Improved PWM waveform generation at some pulse modes. - Resolved an issue preventing the gear ratio setting in Train Configuration popover from being reflected to some elements of sound. 1.3.0 08/11/2021 - You can now set Speed Range in steps of 0.1 km/h in Inverter Configuration editor. 1.2.2 07/20/2021 - Fixed an issue which causes the on-screen keyboard to overlap a focused text field in Inverter Configuration editor on some devices. 1.2.1 07/11/2021 - It is now possible to import / export configuration data as 2D barcodes. - Fixed an issue which causes the on-screen keyboard to overlap a focused text field in Train Configuration popover on some devices. 1.2.0 05/19/2021 - Added a new parameter "Motor Poles" in Train Configuration, which enables you to determine the number of poles in the induction motor. - Tweaked the range of valid values of the gear ratio. 1.1.1 05/05/2021 - Added a new parameter "Speed Range Boundary" in Train Configuration, which enables you to determine the train speed at which the amplitude of the modulating wave gets 100%. - Fixed a bug that overwrote a user-created program when you tapped "Save" button after opening a Demo program. 1.1.0 04/28/2021 - Updated UI design 1.0.1 03/29/2021 1.0.0 03/29/2021
Previous Versions
Here you can find the changelog of OTOTETSU since it was posted on our website on 2023-09-06 17:42:26.
The latest version is 1.9.2 and it was updated on 2026-06-23 19:31:27. See below the changes in each version.
OTOTETSU version 1.9.2
Updated At: 2026-06-02
Changes: Version History - Modified the method for copying inverter configuration patterns. 1.9.2 12/18/2025 - You can now copy and paste inverter configurations. 1.9.1 06/23/2025 - Spread spectrum can now be applied to the injected high frequency signal in asynchronous mode.
- Third harmonic injection is now available.
- Added a feature of inverting carrier phase. 1.9.0 05/12/2025 - Modulation index can now be set manually.
- Tweaked PWM waveform generation in the wide 3-pulse mode of 2-level inverters.
- Reduced the minimum number of teeth on the pinion to 5.
- Fixed an issue that prevents the patterns A / B from being switched on iPadOS 18. 1.8.0 02/18/2025 - Fixed an issue with high frequency signal injection.
- Fixed an issue where the dipolar bias in synchronous mode with 3-level inverters is not applied. 1.7.1 08/26/2024 - It is now possible to simulate SHE-PWM and CHM-PWM for the synchronous mode.
- Added a feature to play rail joint sound and rolling noise. 1.7.0 08/24/2024 - Added a feature of high frequency signal injection.
- Some new types of spread spectrum are now available.
- Fixed an issue that sometimes prevented the app from working after returning from background. 1.6.0 01/18/2023 - Fixed an issue that prevented the app from working after Siri was used. 1.5.2 10/14/2022 - 3-level inverters can now be simulated.
- Added a mode that displays information such as acceleration and driving distance.
- Added a new feature that enables the running resistance to affect the train speed.
- It is now possible to apply a filter to the inverter sound.
- Improved the quality of sound.
- Updated UI design. 1.5.1 02/22/2022 - Added the mode that enables one to control the train speed with the interface like a power and brake lever.
- The train speed can now be modified by a drag operation on the speed meter.
- Removed the speed controlling slider.
- Improved the sound from motors and gears. 1.5.0 01/11/2022 - Each configuration can now contain two patterns of inverter modes.
- Improved the sound from motors and gears. 1.4.0 10/26/2021 - Added a switch to enable and disable overmodulation in Train Configuration.
- Improved PWM waveform generation at some pulse modes. 1.3.1 09/04/2021 - Added analog speed meter design.
- Added a switch for turning the inverter sound on and off.
- Added a new feature that simulate train noise.
- Raised the miximum speed to 160 km/h.
- Improved PWM waveform generation at some pulse modes.
- Resolved an issue preventing the gear ratio setting in Train Configuration popover from being reflected to some elements of sound. 1.3.0 08/11/2021 - You can now set Speed Range in steps of 0.1 km/h in Inverter Configuration editor. 1.2.2 07/20/2021 - Fixed an issue which causes the on-screen keyboard to overlap a focused text field in Inverter Configuration editor on some devices. 1.2.1 07/11/2021 - It is now possible to import / export configuration data as 2D barcodes.
- Fixed an issue which causes the on-screen keyboard to overlap a focused text field in Train Configuration popover on some devices. 1.2.0 05/19/2021 - Added a new parameter "Motor Poles" in Train Configuration, which enables you to determine the number of poles in the induction motor.
- Tweaked the range of valid values of the gear ratio. 1.1.1 05/05/2021 - Added a new parameter "Speed Range Boundary" in Train Configuration, which enables you to determine the train speed at which the amplitude of the modulating wave gets 100%.
- Fixed a bug that overwrote a user-created program when you tapped "Save" button after opening a Demo program. 1.1.0 04/28/2021 - Updated UI design 1.0.1 03/29/2021 1.0.0 03/29/2021
OTOTETSU version 1.9.2
Updated At: 2025-12-18
Changes: - Modified the method for copying inverter configuration patterns.
OTOTETSU version 1.9.1
Updated At: 2025-06-23
Changes: Jun 23, 2025
Version 1.9.1
- You can now copy and paste inverter configurations.
OTOTETSU version 1.9.0
Updated At: 2025-05-12
Changes: May 12, 2025
Version 1.9.0
- Spread spectrum can now be applied to the injected high frequency signal in asynchronous mode.
- Third harmonic injection is now available.
- Added a feature of inverting carrier phase.
OTOTETSU version 1.8.0
Updated At: 2025-02-18
Changes: Feb 18, 2025
Version 1.8.0
- Modulation index can now be set manually.
- Tweaked PWM waveform generation in the wide 3-pulse mode of 2-level inverters.
- Reduced the minimum number of teeth on the pinion to 5.
- Fixed an issue that prevents the patterns A / B from being switched on iPadOS 18.
OTOTETSU version 1.7.1
Updated At: 2024-08-26
Changes: Aug 26, 2024
Version 1.7.1
- Fixed an issue with high frequency signal injection.
- Fixed an issue where the dipolar bias in synchronous mode with 3-level inverters is not applied.
OTOTETSU version 1.6.0
Updated At: 2023-01-18
Changes: Jan 18, 2023
Version 1.6.0
- Added a feature of high frequency signal injection.
- Some new types of spread spectrum are now available.
- Fixed an issue that sometimes prevented the app from working after returning from background.
Disclaimer
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