| 摘要 |
An aural information is expanded correspondingly to a compression system and a compression rate when a receiving signal from a digital telephone circuit is the aural information and a control signal received from the digital telephone circuit indicates that the aural information is compressed. When the control information indicates a stereo system including a right voice system and a left voice system, right and left voices are separated and output. Thus, a stereo communication is realized with an improved tone quality with using a digital telephone set.
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