An elevator system is provided, in which when a telephone in an information center receives an emergency call using an analogue public telephone network from an interphone of an elevator, a monitoring person in the information center can confirm information of the elevator which transmits the emergency call while responding to the emergency call by the telephone. To this end, the elevator system includes: means configured to add, as an identification voice signal, identification information to a call voice signal input to an intercom provided inside each of cars of elevators, the identification information enabling the elevator in which the intercom is installed to be specified; means configured to transmit, with an analog signal, the call voice signal to which the identification voice signal is added; means configured to reproduce the call voice signal included in the transmitted analog signal; means configured to extract the identification information from the identification voice signal included in the transmitted analog signal; and a monitoring terminal configured to acquire, from a server configured to store information on the elevator specified by the identification information in association with the identification information, information on the elevator associated with the identification information extracted from the identification voice signal and to display the acquired information.

The present invention is directed to device and method for monitoring power input to a networked device The device includes a housing; an optional power converter configured for AC to DC, AC to AC or DC to DC conversion; a controller enclosed in the housing and configured to send one or more notifications and receive one or more instructions from a remote server; a relay operably coupled to the controller; a first circuit electrically connecting the power converter to power mains; a second circuit electrically connecting the power converter to the relay; and a third circuit electrically connecting the relay to the networked device, wherein the controller is configured to determine alternating current status on the first circuit and a direct current status on the second circuit or the third circuit.

The present invention is directed to device and method for monitoring power input to a networked device The device includes a housing; an optional power converter configured for AC to DC, AC to AC or DC to DC conversion; a controller enclosed in the housing and configured to send one or more notifications and receive one or more instructions from a remote server; a relay operably coupled to the controller; a first circuit electrically connecting the power converter to power mains; a second circuit electrically connecting the power converter to the relay; and a third circuit electrically connecting the relay to the networked device, wherein the controller is configured to determine alternating current status on the first circuit and a direct current status on the second circuit or the third circuit.

An elevator system is provided, in which when a telephone in an information center receives an emergency call using an analogue public telephone network from an interphone of an elevator, a monitoring person in the information center can confirm information of the elevator which transmits the emergency call while responding to the emergency call by the telephone. To this end, the elevator system includes: means configured to add, as an identification voice signal, identification information to a call voice signal input to an intercom provided inside each of cars of elevators, the identification information enabling the elevator in which the intercom is installed to be specified; means configured to transmit, with an analog signal, the call voice signal to which the identification voice signal is added; means configured to reproduce the call voice signal included in the transmitted analog signal; means configured to extract the identification information from the identification voice signal included in the transmitted analog signal; and a monitoring terminal configured to acquire, from a server configured to store information on the elevator specified by the identification information in association with the identification information, information on the elevator associated with the identification information extracted from the identification voice signal and to display the acquired information.

Systems, methods, and computer-readable media for call classification and for training a model for call classification, an example method comprising: receiving DTMF information from a plurality of calls; determining, for each of the calls, a feature vector including statistics based on DTMF information such as DTMF residual signal comprising channel noise and additive noise; training a model for classification; comparing a new call feature vector to the model; predicting a device type and geographic location based on the comparison of the new call feature vector to the model; classifying the call as spoofed or genuine; and authenticating a call or altering an IVR call flow.

Systems, methods, and computer-readable media for call classification and for training a model for call classification, an example method comprising: receiving DTMF information from a plurality of calls; determining, for each of the calls, a feature vector including statistics based on DTMF information such as DTMF residual signal comprising channel noise and additive noise; training a model for classification; comparing a new call feature vector to the model; predicting a device type and geographic location based on the comparison of the new call feature vector to the model; classifying the call as spoofed or genuine; and authenticating a call or altering an IVR call flow.

A process and corresponding system for encoding and decoding digital data in analog signals is disclosed. Digital data values are represented by concurrent combinations of distinct audio tones, which combine to create chords. The chords have multiple identifiable parameters that can be modulated to represent the data values. For instance, the modulated chords can include a concurrent combination of distinct tones that each have a different frequency and a different starting time. The frequencies of the tones and the starting times of those tones can be modulated to create unique combinations that represent respective data values. As such, analog audio content of a given chord can be used to represent a particular data value and the analog audio signals can be transmitted between nodes in a communication network in order to communicate that data value.

Systems, methods, and computer-readable media for call classification and for training a model for call classification, an example method comprising: receiving DTMF information from a plurality of calls; determining, for each of the calls, a feature vector including statistics based on DTMF information such as DTMF residual signal comprising channel noise and additive noise; training a model for classification; comparing a new call feature vector to the model; predicting a device type and geographic location based on the comparison of the new call feature vector to the model; classifying the call as spoofed or genuine; and authenticating a call or altering an IVR call flow.

Systems, methods, and computer-readable media for call classification and for training a model for call classification, an example method comprising: receiving DTMF information from a plurality of calls; determining, for each of the calls, a feature vector including statistics based on DTMF information such as DTMF residual signal comprising channel noise and additive noise; training a model for classification; comparing a new call feature vector to the model; predicting a device type and geographic location based on the comparison of the new call feature vector to the model; classifying the call as spoofed or genuine; and authenticating a call or altering an IVR call flow.

Various embodiments associated with a reference signal are described. When a set of user information embedded with a reference signal is received by a system, a classification of the signal may not be known by the system. Therefore, the system can determine a classification of the reference signal. The reference signal can be passed through a low-pass filter and then an algorithm can be employed to identify the classification of the reference signal. Once the classification of the reference signal is known, the user information can be better used by the system.