- Hot search：
IEEE Std 269-2019 pdf free download
IEEE Std 269-2019 pdf free download.IEEE Standard for Measuring Electroacoustic Performance of Communication Devices.
This annex describes the most common analysis methods and their application. These methods are generally applicable to calibration, test signals. and response measurements. The suitability of any analysis method or test signal may be limited by how the test signal influences the behavior of the device under test. Please see Annex D for information about test signals.
The analysis shall process the time data without gaps. This means there shall be no loss of information and calculations of spectral power will he accurate for both stationary and nonstationary signals. Constant percentage bandwidth (CPB) analysis as defined in A.2 naturally fulfills this requirement. Unless otherwise stated, measurements are specified as long-term root-mean-square (rms) averages during at least one complete period of the active part of the signal.
Random signals shall be measured with a sufficiently long averaging time to ensure a confidence interval of 0.5 dli with a coverage factor of k = 2 (95% probability). When analyzing periodic signals such as pseudo-random noise or a segment of real or artificial speech or artificial voices, the averaging time shall be at least one full period of the signal. For stepped sine signals. there is a period of settling after each change in frequency. Averaging time at each frequency shall be at least one full period after settling. Averaging time shall be stated for all measurements.
CPB analysis is preferred for nonstationary signals and for frequency response measurements of systems without a time stable relationship between the input and output. Other analysis methods may be required. or may be used as alternatives, depending on the application. Whenever a particular analysis method is required. it is specified in the relevant measurement clause, if the results are equivalent to the results obtained using the preferred analysis method, an alternative may be used. In all cases, the analysis method shall be reported.
All rms-lcvcl calculations shall fulfill ANSI S1.4/IEC 61672-1.
For digital analyses, the data are discrete, so the highest frequency that can be measured is determined by the sampling frequency. Therefore, the analysis sampling frequency shall be at least 2.2 times the highest frequency to be measured.IEEE Std 269-2019 pdf free download.
All resources on this website are from the Internet. It is only for personal study and research. No one is allowed to use it for any commercial purpose. If you need, please buy the genuine standard. If there is any infringement of your copyright, please contact the webmaster in time, and I will correct it immediately.
- Maybe you like
- Latest Updates
- ISO 287-2009 pdf free download
- ISO 527-5-2009 pdf free download
- ISO 659-2009 pdf free download
- ISO 660-2009 pdf free download
- ISO 712-2009 pdf free download
- ISO 725-2009 pdf free download
- ISO 730-2009 pdf free download
- ISO 927-2009 pdf free download
- ISO 2041-2009 pdf free download
- ISO 3040-2009 pdf free download
- ISO 3506-2-2009 pdf free download
- ISO 3506-3-2009 pdf free download