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#SYNCHRONIZED TONEGENERATOR GENERATOR#
To overcome the lack of synchronization between the audio generator and the analyzer, the GlideSweep test signal can be preceded by a short audible trigger, at a fixed interval before the sweep signal, that is recognized by the analyzer.Ost_5. Typical examples of playback devices are mobile phones or tablet computers, as well as most devices with built-in speakers.įor these devices, the GlideSweep test signal is recorded and pre-loaded on the device as a wav or mp3 file for playback and analysis. Without this closed loop, the audio analyzer cannot synchronize with the signal. It is not possible to play a test signal generated by the audio generator directly into the device while simultaneously reproducing the signal as an output from the device. Playback devices are identifiable by the absence of a closed signal path. Alternatively, the reflections can also be eliminated by the use of a time window. These are removed by a sliding curve averaging (red curve). The resulting reflections appear in the frequency response (green curve) in the form of ripples. The measurement was carried out in non-free-field conditions. In the following measurement of a midrange speaker, 1.5 seconds of signal duration was used for a measurement bandwidth of 20 Hz - 20 kHz. The lower the frequency, the longer the electromechanical system has to be excited. The duration of the GlideSweep depends on the start frequency.
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The start and stop frequencies must therefore be selected so that not only the specified response bandwidth of the speaker is covered, but that the sweep also begins far enough below the resonance frequency. Apart from the acoustic frequency response in dBSPL (left), the impedance frequency response (right) may also be interesting. The basic measurements used are sweep measurements.įor a meaningful and accurate measurement, the most important sweep parameters to be defined are the start and stop values for the frequency or amplitude as well as the steps (number of desired measuring points) or the duration of the measurement (in the case of a GlideSweep).įor sweep measurements on acoustic components, such as loudspeakers, several items have to be considered.
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Accordingly, measurements on audio and acoustic systems must measure and evaluate the relevant parameters in these dimensions. This range extends over the two dimensions of frequency and level. This is also referred to as an “amplitude sweep”.Īudio and acoustic devices and systems are operated throughout the audible range and beyond. Typically the amplitude and distortion of the device under test are measured. Here, the frequency of the test signal is kept constant while the amplitude is varied. The main application for the stepped sweep is to measure the linearity of systems. Since the settling time of different test objects cannot be predicted, the duration of a stepped sweep cannot be determined exactly in advance.įor the determination of amplitude or frequency response, the stepped sweep has been largely replaced by the glide sweep. The stability condition (settling) can be defined by the user. The scaling of the steps is linear or logarithmic. After each change, the analyzer waits until a stable reading is detected before switching to the next step. In a stepped sweep, one variable input parameter (frequency or amplitude) is incremented or decremented in discrete steps. The reason for this lies with the high computing power required. Smartphones, tablets or smart devices.Īlthough the theory behind the glide sweep has been known for several decades, its use in audio measuring devices has only evolved over the past several years. This method is particularly useful when measuring devices which do not have an audio input channel, e.g. To indicate to the measurement system that the test signal is about to start, the sweep signal is preceded by a short trigger sequence. Since the exact duration of the sweep signal is known, the glide sweep is ideally suited for measuring signals that are not played by the audio test system itself, rather by the device under test.