Abstract: A telephone incoming signal discriminator includes a first relay, an FSK detector, a DTMF detector, a pin detector, a tone amplifier and oscillation control, an FSK/DTMF decoder IC, a memory, a buzzer, a comparison/setting control IC, an auto answer machine, and a second relay. When a telephone signal is received, it is detected by the FSK detector and the DTMF detector, decoded by the FSK/DTMF detector IC, and then compared with a set code by the comparison/setting control IC, so that the comparison/setting control IC drives the telephone to ring when matched, or switches on the second relay for enabling the incoming telephone signal to be shifted to the auto answer machine when not matched.

Abstract: A house intercom security system includes a main unit connected between the exchange line of a telecommunication office and a telephone set, an indoor intercom and an outdoor intercom respectively connected to the main unit, and an alarm connected to the main unit. The main unit is driven to dial a pre-set telephone number when a visitor presses on the outdoor intercom, as the host of the house in which the house intercom security system is installed is absent. The indoor intercom is driven to trigger the alarm and to dial a pre-set telephone number for help when the user presses on an alarm button of the indoor intercom.

Abstract: A house intercom security system includes a main unit connected between the exchange line of a telecommunication office and a telephone set, an indoor intercom and an outdoor intercom respectively connected to the main unit, and an alarm connected to the main unit. The main unit is driven to dial a pre-set telephone number when a visitor presses on the outdoor intercom, as the host of the house in which the house intercom security system is installed is absent. The indoor intercom is driven to trigger the alarm and to dial a pre-set telephone number for help when the user presses on an alarm button of the indoor intercom.

Abstract: A telephone incoming signal discriminator constructed to include a first relay, a FSK detector, a DTMF detector, a pin detector, a tone amplifier and oscillation control, a FSK/DTMF decoder IC, a memory, a buzzer, a comparison/setting control IC, an auto answer machine, and a second relay, wherein when a telephone signal comes, it is detected by the FSK detector and the DTMF detector, and then decoded by the FSK/DTMF detector IC, and then compared with the set code by the comparison/setting control IC, so that the comparison/setting control IC drives the telephone to ring when matched, or switches on the second relay for enabling the incoming telephone signal to be shifted to the auto answer machine when not matched.

Abstract: A communication peripheral apparatus automatic line searcher includes a CPU (central processing unit) connected to two ring detectors, two hold detectors, two in-use detectors and a loop detector, the ring detectors, hold detectors and in-use detectors being respectively connected to a first telephone line and a second telephone line, the first telephone line and the second telephone line being respectively connected to contacts of a first relay, the first relay having a center contact connected to the normal-close contact of a second relay. The CPU automatically switches the vacant telephone to the vacant telephone line upon a call through one telephone line. The relays are switched to drive the phone power through the CPU to indicate the in-use status of the corresponding telephone line.