Radiocommunications Weighting Filters

ITU-R 468-4 and Dolby weighting filters are bandpass filters you use to emphasize the response to the types of impulsive noise that often couple into audio cables. Typically, you use these filters to measure audio frequency noise in broadcasting, sound-recording systems, and sound program circuits.

The frequency response of the ITU-R 468-4 filter is standardized by ITU-R Recommendation 468-4. The following figure shows the relative attenuation defined for the ITU-R 468-4 and Dolby weighting filters.

Figure 23. Relative Attenuation of ITU-R 468-4 and Dolby Filters

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