IR Signal Database Utility

Introduction

A core program for use with both the RedRat3 and irNetBox, the IR Signal Database Utility Supports the creation, viewing and testing of IR signal datasets.

What is a signal database, and why may you want one? It is your local set of IR remote control signals that you use and work with, made up of one or more remotes (e.g. TV, DVD_PLAYER) each with a set of IR signals. These are usually captured directly from the original remote control unit via a RedRat device, analysed and then stored in an XML file.

The utility allows:

  • Sharing remote control data with others.
  • Using datasets in RedRat applications or your own applications developed with the RedRat SDK.
  • The testing of signal decoding when inputting IR signals.
  • Using datasets to control your TVs or STBs via RedRat devices.

Download

IR Signal Database Utility V4.07.zip

Change history

Application changes and bug fixes can be viewed here.

Creating an IR Signal Dataset

An IR signal dataset is basically a copy of the IR signals produced by your remote control unit. These can then be transmitted to control your TV or STB, or are used for comparison when decoding input IR signals.

The process of creating a dataset from your remote control unit is often referred to as learning or capture. We recommend using a USB RedRat3-II device for IR capture, though an irNetBox can be used as well.

irSignalDB

The steps are:

  1. Create a new device/remote node from the Edit menu.
  2. Add a signal to the device, which will bring up a dialog box. Press Learn IR, and point your remote control at the IR input on the RedRat device. For most types of IR signal, one has to press the remote control button twice.
  3. Test the quality of the captured IR signal by outputting it again to see if it will control your TV/STB. This is done by selecting the signal and using the Edit > Test Signal Output menu item.

This process can be quite laborious, so the wizard can be used instead. This is started from the Edit > New Device/Remote Wizard menu item, and allows you to edit the list of IR signals to capture, then starts a loop for capture of them all.

Obtaining an accurate IR signal dataset is very important as the reliability of operations using this data depend on it. Therefore investing a little time in ensuring that all IR signals are correctly captured can save a lot of time later.

Improving the Quality of the Captured Data

Sunlight and artificial light both contain a certain amount of IR, so it is recommended that capture should by done with as little incident light on the RedRat device as possible, i.e. ensure the device is shaded. The RedRat3-II device has more light screening, so is a little bit more robust in this respect.

When learning, hold the remote control about 10 to 20cm away from the RedRat device and give a short but firm press of the remote control button.

Most IR signals are basically sequences of pulses of a carrier wave, for example at 38KHz. However there is a large variation in the way in which different protocols are coded by sequences of pulses, so it may be necessary to adjust the way in which IR signals are captured:

  • Firstly in the device properties, from the Edit menu item. It may be necessary to check one of the boxes if it is known, for example that the remote control generates keyboard type signals. (This will be explained in a knowledge base article.)
  • Secondly, the way in which the RedRat device samples the signal can be adjusted using the signal capture parameters dialog from the View menu item. (To be explained in more detail in a knowledge base article.)

Viewing IR Signal Data

IR signal waveforms can be viewed by double-clicking on an IR signal and selecting the IR Data button, bringing up the waveform viewer and editor. A certain amount of data editing is also possible, for example adjusting the number of repeats.

waveforms

Signal Decoding

The aim of signal decoding is for use in applications which controls PC operation from several meters away using a remote control handset. Examples could be PVR applications, Powerpoint displays etc. The primary RedRat application for use here is RedRatControl.

As with IR signal output, reliable signal decoding depends on good quality IR data, but also on some understanding of the IR protocol used. RedRat software uses a general purpose decoder which works well for a good proportion of IR signals, but not all.

So to test how well it works with your dataset, open the decode window from the View menu item, point your remote control at the RedRat and press some of the buttons. If it can’t decode them or they haven’t been captured, then an “unknown” will be shown.

We do have additional decoders for certain types of IR protocol not handled well by the default decoder, so please contact RedRat support for more information about this.

Signal Data Export

IR signal datasets can be exported in other formats for different applications:

  • irNetBox Signal Data: This is for code which directly implements the irNetBox communication protocol. The export process creates the data blocks for download when outputting IR signals. If using RedRat applications or the SDK with an irNetBox, then the standard XML format can be used.
  • Pronto Format: Used by some IR applications, this export option attempts to convert the IR data to this format.
  • LiRC Format: For use with the Linux IR remote control infrastructure.
  • IrOuptut Format (Linux): For use with RedRat’s Linux IR output tool.
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