![]() ![]() 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. 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. ![]()
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