摘要 |
PURPOSE:To eliminate holding sound selecting switch by selecting a different holding sound from the previous one and sending a line for the operation of a holding key. CONSTITUTION:One side terminal of a holding key 5 composed of an ON OFF switch is connected to a first output port of a control means 4, a key scanning signal KI is supplied, and ON OFF information HK of the key 5 is supplied to a second input port of the control means 4. Holding sound selecting data at the time of sending the previous holding sound are stored in a storing means 6 composed of an IC memory. A second output port of the control means 4 is connected to a first input edge of a holding sound generating means 7 and a selecting signal SEL of a selected holding sound is sent. Further, the second output port of the control means 4 is connected to a second input edge of the generating means 7 and a holding signal HLO to continue to send a holding sound is sent. Each time the key 5 is operated, a different holding sound is selected and sent to a line.
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