| 摘要 |
1385069 Substation apparatus PIONEER ELECTRONIC CORP 1 May 1972 [30 April 1971] 20227/72 Heading H4K A telephone answering machine is adapted in response to an interrogation signal received from a remote location, to replay only those of the messages recorded in response to incoming calls that were received since the last interrogation. As described the machine has a closed loop announcement tape driven by a first drive motor at the start of each call and a message tape driven in forward or reverse direction depending on whether a first solenoid is energized or not. Two counters are provided each driven in the forward or reverse direction whenever the tape moves in that direction. Each counter has an associated solenoid which when energized resets that counter to zero and an associated contact which it sets in one state when its count is positive and in the other state when the count is negative. At the end of each interrogation operation both counters read zero. As subsequent messages are recorded the counters are advanced simultaneously. When an interrogation signal (a predetermined frequency transmitted by a caller) is received one counter is reset, the first solenoid is deenergized and the message tape drive motor activated driving the tape in the reverse direction. When the other counter passes through zero it switches its contact disabling a relay re-energizing the first solenoid causing the tape to be driven in the forward direction. When the messages have been replayed the said one counter passes through zero operating its contact to de-energize another relay which returns the apparatus to the standby condition and connects a charged capacitor to the solenoid associated with the other counter resetting the same. Thus both counters are reading zero ready for further recording and interrogation. |
