| 摘要 |
An audio signal expander apparatus for integration into a satellite receiver for recovering audio signal transmissions carried by satellite services utilizing compressed audio signal transmission processing wherein the incoming audio signal is expanded by a ratio which varies with both the audio signal amplitude and audio signal frequency. The audio signal passes first through a low-pass filter and then through a frequency selective negative feedback circuit the output of which is filtered and de-emphasized. In addition, the level of the output audio signal may be varied by a level control adjustment.
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