A VOICE TRANSMITTING APPARATUS, A VOICE TRANSMITTING METHOD, AND A VOICE BAND SIGNAL TRANSMITTING SYSTEM USING THE SAME APPARATUS OR THE SAME METHOD

摘要

A voice band signal is compression-encoded at a voice compression-encoding portion and is assembled into a cell at a cell assembling portion. Conversely, the voice band signal is disassembled at a cell disassembling portion and is decoded at a voice compression-decoding portion. When, from both of up and down data judging portions, receiving a judgement of coincidence of the voice band signal with a signal at the time when the line is unused, a timer counts a continuation time. When the continuation time exceeds a protection time, a protection time judging portion causes the cell assembling portion to stop the cell transmission. When, from either of the up and down data judging portions, receiving a judgement of no coincidence with the signal at the time when the line is unused, or when the continuation time does not exceed the protection time, the cell assembling portion is directed to transmit the cell.