![]() C ontrols are conveniently available at both the scope menu and at the detachable scope tool bar. Background and trace colors for the scope display can be switched among 5 different color schemes. Trace can be frozen at any time by pressing the space bar. Traces can be triggered from either the Left or Right inputs. TrueRTA's Oscilloscope allows you to view the input signal waveform. The latter settings are appropriate for highly accurate frequency response measurements. Longer samples provide increased low frequency resolution with the tradeoff of slower updates. The size of the waveform sample is variable so that shorter samples can be used where a high frame rate is required, as in sampling live music. The audio spectrum analyzer shows the changing spectrum of live input signals up to 48kHz half the maximum sampling frequency. Study the harmonic structure of musical instruments. Analyze the distortion characteristics of audio equipment. Measure the frequency response of various types of audio equipment. 7 Best Free Audio Spectrum Analyzer Software For Windows Observe the frequency characteristics of recorded music or other recorded audio. Study the noise characteristics of acoustic environments or electronic gear. Combine individual loudspeaker measurements into a spatial average frequency response measurement. ![]() Measure the frequency response of a loudspeaker system using either pink noise or Quick Sweep. TrueRTA turns your PC into a powerful audio test system normally seen only in better audio research and design laboratories. Then add the measurement microphone, preamp and USB interface of your choice. Then, enter that value and TrueRTA will be calibrated for your sound card, allowing accurate measurement of input signal levels as well as accurate output signal amplitudes. You will need a digital voltmeter so that you can measure the signal level. Oscilloscope Here is a screen showing the oscilloscope in dual trace mode and displaying a 1 kHz sine wave. The digital Quick Sweep is an excellent alternative to stepped sine wave frequency response testing. The swept sine wave provides a higher signal level at each frequency compared to pink noise and lacks the peaks and valleys seen in pink noise response plots. This signal is a high-resolution alternative to using pink noise for system testing. The higher level versions of the product can also provide a digitally created logarithmic sine sweep from 10 Hz to 48 kHz. In addition to the sine wave the generator can be switched to pink noise. The output level can be specified anywhere from full scale to a single bit of amplitude. Only the response of the actual filter is measured when sound card correction is employed. Note the total absence of any sound card response error. When loaded by the input impedance of the sound card the series capacitor forms a high pass filter with -3 dB frequency at around Hz. The response of any system you now insert in the test loop can now be measured very precisely plus or minus.īelow is a Quick Sweep measurement of a high pass filter created by inserting a pF capacitor in the test loop. ![]() Note that the response of the sound card has been removed from the measurement so that a self test of the sound card now shows a flat response. Here are the components that make up TrueRTA. ![]()
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