To determine the THD+N at each level step, the algorithm has to first extract the on portion of the signal, then compute the THD+N based on FFT analysis. The signal processing in this case is tricky, especially for the 1.0 kHz sine-burst. This measurement uses the same regulation process, except the signal is one of the specified sine-bursts instead of a continuous sine signal. The configuration panel for Maximum Output (CEA 2006) is almost identical to that of Maximum Output (Figure 1b versus Figure 1a). The Dynamic Power Rating is the output power delivered during the on portion of the burst signal while maintaining no more than 1.0% THD+N. For bandwidth-limited amplifiers (e.g., a subwoofer amplifier) the standard specifies a 50 Hz sine-burst signal with 10 on cycles followed by 20 rest cycles. For full-bandwidth amplifiers, the standard specifies a 1.0 kHz sine-burst signal with 20 on cycles (signal at high level) followed by 480 rest cycles (signal 20 dB lower than the on level). This measurement specifically addresses the Dynamic Power Rating requirement in standard ANSI/CEA-2006-B – Testing and Measurement Methods for In-Vehicle Audio Amplifiers. Having Maximum Output as an explicit measurement in sequence mode adds benefits such as the ability to put limits on results, add sequence steps to the measurement and have the results flow into the sequence report. The main difference is that in Maximum Output, the regulation target is fixed at THD+N.
#Audio signal generator generator
As shown in Figure 1a, the configuration panel for the Maximum Output panel is almost identical to the Automatically Set Generator Level dialog.
As mentioned in Part 1, the maximum output power of an amplifier is typically specified as the measured output level due to a mid-frequency sine stimulus when the THD+N Ratio just reaches one percent. This measurement is intended to address the classic use case of finding the rated output of a power amplifier at one frequency. Measurement configuration panels for (a) Maximum Output, (b) Maximum Output (CEA-2006) and (c) Regulated Frequency Sweep.
0 kommentar(er)
