SIGNAL TRANSFER SYSTEM AND SIGNAL TRANSFER METHOD

To efficiently transfer a voice signal and a charging signal.SOLUTION: A signal transfer system transfers an analog signal including a charging signal superposed on a voice signal from a transmitter to a receiver. The transmitter includes: a separation unit for separating a voice signal from the analog signal; an AD conversion unit for performing AD conversion on the voice signal separated by the separation unit; a detection unit for detecting the charging signal from the analog signal; an encoding unit for encoding the charging signal detected by the detection unit; and a transmission unit for transmitting the voice signal on which the AD conversion unit has performed AD conversion and the charging signal encoded by the encoding unit, to the receiver. The receiver includes: a reception unit for receiving the voice signal and the charging signal transmitted by the transmission unit; a DA conversion unit for performing DA conversion on the voice signal received by the reception unit; a decoding unit for decoding the charging signal received by the reception unit; a conversion unit for converting the charging signal decoded by the decoding unit to an analog wave; and a combination unit for combining the analog wave and the voice signal on which the DA conversion unit has performed DA conversion.SELECTED DRAWING: Figure 2 【課題】音声信号と課金信号を効率的に伝送する。【解決手段】音声信号に課金信号が重畳されたアナログ信号を送信装置から受信装置へ伝送する信号伝送システムにおいて、送信装置が、アナログ信号から音声信号を分離する分離部と、分離部が分離した音声信号をＡＤ変換するＡＤ変換部と、アナログ信号から課金信号を検出する検出部と、検出部が検出した課金信号を符号化する符号化部と、ＡＤ変換部がＡＤ変換した音声信号、及び符号化部が符号化した課金信号を受信装置に対して送信する送信部とを有し、受信装置が、送信部が送信した音声信号及び課金信号を受信する受信部と、受信部が受信した音声信号をＤＡ変換するＤＡ変換部と、受信部が受信した課金信号を復号する復号部と、復号部が復号した課金信号をアナログ波に変換する変換部と、ＤＡ変換部がＤＡ変換した音声信号及びアナログ波を合成する合成部を有する。【選択図】図２