JR2WAV Editor

JR2WAV Editor is a WAV file editing tool designed to analyze cassette tape audio for the JR-200, perform noise reduction, waveform shaping, and restore data. You can proceed with editing while checking whether it can be converted to CJR format at any time.

This manual explains the functions of each screen area, the purposes of the menu commands, and specific operating procedures.

System Requirements

Windows 10/11

.NET 8.0 or later

Download

https://github.com/find-jr200/JR2WavEditor

First, download JR2WavEdxxx.zip (which does not include WinRT-related DLLs). If it does not work correctly, download JR2WavEdxxx_withWinRTDLL.zip (which includes WinRT-related DLLs).

Techniques for Successful CJR Conversion

Once you load a WAV file, first try executing "Tools" -> "Convert to CJR".
If that fails, try applying the BPF (Band-pass Filter).
If it still fails, restore the state to immediately after loading and try Automatic Waveform Shaping.
If it still fails, try a combination of methods, starting with BPF + Automatic Waveform Shaping.
If it still fails, try gradually raising the lower bound of the BPF passband from 500 Hz.
If all else fails, you will need to manually modify the waveform (Replace Selection with Waveform, Replace Selection with Value, Anchor Editing).

* Successfully converted blocks will display their names, but if there is any failed portion, it may not process correctly. Please use this as a general guideline.

Cautions

If you want to convert to CJR, please try JR2Rescue first. If that fails, try JR2Wav Editor.

WAV files recording special formats can be edited but cannot be converted to CJR.

JR2 conversion is also not supported. Please use JR2Rescue.

Screen Layout & Area Description Menu Commands List

Screen Layout and Functions

▤

Block Name Display Area

Analyzes the data structure in the WAV data and displays the type and position of program components (blocks) on the timeline.

Displayed Blocks

Header Block: The starting block containing the program name, size, and baud rate information.
Data Block (1 to N): The actual segmented program binary data.
Footer Block: The block indicating the end of the data.

⏰

Time Ruler

A ruler showing the passage of time for the waveform. Tick marks are placed every 10 milliseconds (msec), and numbers indicating seconds are displayed every 1 second (sec).

Features

Tick mark rendering is automatically synchronized according to the horizontal zoom (display interval).
Allows you to accurately read the time of specific audio locations in milliseconds.

📈

Waveform Panel

The main operation area where you visualize and directly edit WAV data waveforms sample-by-sample, and select editing ranges.

Operation Methods

Anchor Editing: Drag points (anchors) on the waveform up and down with the left mouse button to directly modify sample amplitudes.
Range Selection: Left-click to place the start point (red triangle). Drag or Shift+click to set the end point (blue triangle) and select a range (light yellow background).
Deselection: Left-clicking clears the selection, and the clicked position becomes the new start point.

📊

Scroll & Status Bar

Performs overall movement and monitors file meta-information.

Components

Horizontal Scrollbar: Scrolls the waveform display position from start to end.
Status Bar: Constantly displays sampling frequency, bit depth, channel count, total samples, total duration, and current display/anchor intervals.

Menu Commands List

Purpose and Behavior

22kHz–48kHz / 8, 16bit only / Uncompressed only Loads a WAV file. For stereo (2ch) files, you can choose to import them as monaural (1ch) data by averaging the left and right channels, importing only the left channel, or importing only the right channel. Drag-and-drop is supported. The maximum readable file size is 500MB.

Purpose and Behavior

Replaces the selected range with a square wave of the specified frequency (1200Hz / 2400Hz), polarity (starting direction), and number of cycles (0.5 to 4 cycles).

Application Process

After placing the square wave, an FIR low-pass filter is automatically applied (the minimum amplitude is clamped to 50%).

Purpose and Behavior

Replaces the selected range with a JR-200 standard data signal waveform representing a specified 1-byte value (hexadecimal 00 to FF). This signal consists of 12 bits: 1 start bit, 8 data bits, and 3 stop bits.

Application Process

After generating the signal with the specified baud rate (1200 / 2400 baud) and polarity, an FIR low-pass filter is automatically applied (the minimum amplitude is clamped to 50%).

Purpose and Behavior

Changes the interval of anchor points that are displayed on the waveform and can be dragged (from a minimum of 1 sample to a maximum of 10 samples).

Effect

Increasing the anchor interval automatically interpolates intermediate samples along the line connecting the anchors, allowing you to manipulate smooth waveform changes in groups.

Purpose and Behavior

Decodes the data block signals within the audio and saves them as a readable "CJR file". If the conversion fails, the cause of the error is displayed, and the focus moves to that block.

Additional Processing

Upon completion of decoding, if the baud rate specified in the header block (24th byte) is non-zero, it is automatically corrected to 0. The checksum (33rd byte) is then recalculated accordingly and overwritten.

Purpose and Behavior

Displays a dialog to configure detailed parameters for applying the band-pass filter (BPF).

Configurable Items

You can fine-tune the number of taps (Taps: 50 to 500), lower passband limit (100 to 1200 Hz), upper passband limit (2400 to 24000 Hz), and the Kaiser window beta value (Beta: 0.5 to 15.0).