Abstract: A system (100) and method deliver audible caller identification information when standard Caller ID information can not be provided. A calling party is prompted by an announcement to provide the audible caller identification information. The announcement may be tailored by changing the language of the announcement, for example, to conform to the majority of calls received by the called party. A special designator may be stored in association with account information when the service is ordered. The designator is read before the announcement is played to the calling party. The audible caller identification information is recorded and played to the called party in a message. The message may be tailored by changing the language or format of the announcement.

Abstract: A ring generator circuit is included in a subscriber line interface circuit (SLIC) for providing a high voltage ring signal to a plurality of ringers at the same time. The ring generator circuit includes an adder and divider circuit connected to receive a DC offset and an AC reference signal from the SLIC. The adder and divider circuit outputs a fractionalized summed signal. That signal is supplied to a full-wave rectifier, which rectifies the fractionalized summed signal so that it is always a positive voltage. The rectified signal is supplied to a switch control circuit, a first amplifier and a second amplifier. The first and second amplifiers have the same gain, but with opposite signs or polarities. The outputs of the first and second amplifiers are sent to a commutating switch, which is controlled by an output of the switch control circuit.

Abstract: A circuit assembly which includes an interface circuit between a subscriber line and exchange devices of the kind with two amplifiers connected in a bridge configuration between the battery terminals and having a means of detecting the output currents; a supply circuit which includes the exchange battery and a ring generator; a switch-over means for putting the line through the interface circuit or the supply circuit; two bridge resistors which are in series with the line when the latter is connected to the supply circuit and of which one is connected permanently between one of the line terminals and the output of one of the amplifiers, which output is substantially at the potential of one of the battery poles; an additional resistor, having a much higher resistive value than that of the bridge resistors and being connected between the other of the line terminals and the output of the other of the amplifiers; and a processing means within the interface circuit, which includes said detecting means and is effec

Abstract: A call signal generating circuit includes a step-up transformer having a primary winding and secondary windings and a first switching circuit coupled between the primary winding of the step-up transformer and a D.C. power source for turning ON/OFF at a frequency higher than a frequency of a call signal. A rectifying circuit is coupled to the secondary windings of the step-up transformer for rectifying voltages induced at the secondary windings into a positive polarity voltage and a negative polarity voltage. A second switching circuit is coupled to the rectifying circuit for alternatively outputting the positive polarity voltage and the negative polarity voltage with a quiescent time in which both the positive and negative polarity voltages are not output. A capacitor is coupled to the second switching circuit for receiving the positive and negative polarity voltages output from the second switching circuit.

Abstract: A first part for picking up a signal being proportional to a ringing tone signal transferred on a subscriber line; a second part for extracting an ac component from the thus picked-up signal; and a third part for receiving both the signals from the first and second parts and comparing, in level, these two signals to produce a ringer stop signal if the level difference therebetween becomes larger than a setpoint value, and thus, a conventional low-pass filter can be removed.

Abstract: A calling signal controller in which a calling signal generator having a necessary and minimum output capacity is used to the most efficiently possible extent. The controller includes a phase number memory specifying the total number of phases of calling signals used to selectively call a plurality of telephone sets, a ringing count memory loaded with a ring count for each of the phases, and a ringing control memory of which addresses are associated with the phase numbers and the ringing counts, thereby controlling the calling signals.