How to Use TrueRTA Level 4 to Analyze Audio Signals
TrueRTA is a software that turns your PC into a powerful audio test system. It can measure the frequency response, distortion, noise and other characteristics of audio signals using a measurement microphone, preamp and a USB interface. TrueRTA Level 4 is the highest resolution version of TrueRTA, which can show you up to 240 frequency bands in real time.
In this article, we will show you how to use TrueRTA Level 4 to analyze audio signals using a simple example. We will use a sound file called Truerta Level 4 303, which is a short audio clip that contains a 303 synthesizer sound. You can find this sound file on SoundCloud[^1^] [^2^] [^3^]. We will use TrueRTA Level 4 to measure the frequency spectrum, the harmonic structure and the peak level of this sound file.
Step 1: Set up your hardware and software
To use TrueRTA Level 4, you will need the following hardware and software:
A PC with Windows Vista, 7, 8 or 10 and a basic sound capability.
A measurement microphone with a flat frequency response.
A microphone preamp with phantom power and low noise.
A USB interface that can connect your microphone and preamp to your PC.
TrueRTA Level 4 software, which you can download from True Audio.
Once you have installed TrueRTA Level 4 on your PC, you will need to register it with a code that you can purchase from True Audio. You will also need to calibrate your microphone and sound card using the Calibration Wizard in TrueRTA. This will ensure that your measurements are accurate and consistent.
Step 2: Load the sound file and start the analysis
After you have set up your hardware and software, you can load the sound file Truerta Level 4 303 into TrueRTA. To do this, go to File > Open Wave File and select the file from your computer. You will see a waveform of the sound file on the oscilloscope window of TrueRTA.
To start the analysis, go to Options > Input Source and select Wave File Playback. This will make TrueRTA play back the sound file through your sound card and analyze it in real time. You can adjust the playback volume using the slider on the bottom right corner of TrueRTA.
Step 3: View the frequency spectrum
The main window of TrueRTA shows you the frequency spectrum of the sound file in real time. You can see how the energy of the sound is distributed across different frequency bands, from low to high. You can also see how the spectrum changes over time as the sound file plays.
You can customize the appearance of the spectrum window by using the buttons on the top toolbar of TrueRTA. For example, you can change the number of frequency bands from 1/3 octave to 1/24 octave by clicking on the buttons labeled \"3\" and \"24\". You can also change the color scheme, scale and range of the spectrum by clicking on other buttons.
Step 4: View the harmonic structure
The harmonic structure of a sound is the pattern of frequencies that are multiples of a fundamental frequency. For example, if a sound has a fundamental frequency of 100 Hz, its harmonics are 200 Hz, 300 Hz, 400 Hz and so on. The harmonic structure gives a sound its timbre or quality.
To view the harmonic structure of the sound file Truerta Level 4 303, you can use the cursor function in TrueRTA. To do this, click on the button labeled \"Cursor\" on
the top toolbar of TrueRTA. This will activate a vertical line that you can drag across
the spectrum window. As you drag the cursor, you will see a readout of
the frequency and level at that point on
the spectrum. You will also see horizontal lines that 29c81ba772