Matches 51 - 100 out of 259 < 1 2 3 4 5 6 >
Match Document Document Title
6574335 Method for simulating a ring back for a call between parties in different communication networks  
A ring back signal for a call between a calling party and a called party can be simulated. A ring back message associated with the call is received. The calling party is associated with a first...
6556673 Telephone ring signal detector  
A telephone ring signal detector is coupled to a telecommunication line for detecting a first telephone ring signal, and for discriminating the first telephone ring signal from other line signals...
6445802 Sound volume controllable communication apparatus  
A sound volume-controllable communication apparatus capable of outputting signals as monitoring sounds simultaneously with the transmission and reception of the signals is disclosed. At the time of...
6438224 Tone detection  
Signaling tone detection systems are presented that may allow for reductions in talk-off, cut-through, or both. In one general aspect, a detection system includes an outgoing signaling tone...
6434236 PC server telecommunications power system  
A system within a PC server cabinet for receiving an externally supplied loop feed voltage (−48 VDC) and generating a ringing voltage (75 VAC) from the loop feed voltage. For universal...
6373941 Tone generator for electronic exchange  
A tone supplying device generates various tone signals which an exchange can provide for public subscribers. Address signals generated by a counting operation of a first counter are inputted to a...
6310954 Ringer circuit  
A high efficiency ringer circuit having low distortion of the ringer output signal, which is simple in design and inexpensive to manufacture is disclosed. This may be accomplished with a ringer...
6298132 Ringing-tone control device for telephone set, using audio signal sent by caller  
In a ringing-tone control device for a telephone set, an audio signal which is sent from a communication opposite party is converted into a corresponding bi-level signal. The bi-level signal is...
6295357 System and method for ringing other subscriber telephones connected to a telephone line during data communications on the telephone line  
A system and method for enabling a subscriber to receive incoming telephone calls on a telephone line and ring all of the telephones connected to a first conductor pair inside the subscriber's...
6289099 Ringer for satellite user terminals  
An apparatus, system, method, and computer program product for providing a flexible ringer for multiple deskset phones. A controller detects a flag message that precedes an incoming telephone call,...
6259691 System and method for efficiently transporting dual-tone multi-frequency/multiple frequency (DTMF/MF) tones in a telephone connection on a network-based telephone system  
A method and system in a network telephony system for transporting audio signals with lower delay when DTMF is not present. The method of transporting audio signals determines whether DTMF signals...
6246761 Automatic volume control for a telephone ringer  
A telephone is provided with a means for automatically generating ringing tones to be heard by a user over ambient noise and in spite of any muffling environment in which the telephone may be...
6240176 Method to alert a phone operator by magnetic means of an incoming call  
A vibrating device for alerting a phone user of an incoming call includes a receiver of an electric signal representing the incoming call, and a converter which renders the electric signal into a...
6198945 Method for providing a dial tone for use in wireless environments  
This invention provides a dial tone for use in analog, TDMA, and CDMA wireless environments and includes the capability to collect additional digits during certain calling feature activation. The...
6191684 Remote supply circuitry  
Remote supply circuitry for remotely supplying a subscriber connections in a communications system wherein subscribers can be connected to a central point via subscriber lines. Subscriber supply...
6192231 Telephone apparatus  
A telephone apparatus connects to a telecommunications network via an exchange line. It has signal recognition for detecting and recognizing calling line identity (CLI) and called number identity...
6167135 Method and apparatus for generating a ringing signal  
In generating a ringing signal of predetermined frequency and shape between the A- and B-wires to a subscriber's station in a telephone network, the ringing signal is directly injected in or...
6134455 Annunciating apparatus, and associated method, for radio communication device  
Annunciator apparatus, and an associated method, for a mobile station, such as a radio telephone operable in a cellular communication system. When a call is to be terminated at the mobile station,...
6118979 Method for signaling an incoming telephone call without an audible signal  
A method of communicating an incoming call through a telephone receiver having an incoming call circuit and an audible signal system operatively connected to the circuit. The incoming call is...
6115469 Telephone line ring signal and DC power generator  
A ring generator circuit provides both a ring signal and talk battery to a subscriber telephone line. The ring generator recognizes whether talk battery voltage or a ring signal voltage is required...
6055245 Apparatus and method for digitally conveying alert tones between an analog modem and an ISDN terminal adapter  
An apparatus and method for facilitating interaction during a communication session between an analog modem and a terminal adapter for conveying digital alert tones and control data therebetween is...
6052573 Fixed subscriber unit of wireless local loop system  
An off-hook/on-hook signal discriminating means 5a is provided in a control portion 5 of the FSU in order to make discrimination between a pulse dial signal and a hooking signal. When a telephone...
6014441 Method and system for generation of tone signals over a transmission channel  
A user-authentication system includes an authorized user device (AUD) for transmission of dtmf tones to a user-verification system (UVS) over a telephone network, where user-verification is...
6005934 Simulating changes in telephone subscriber line  
A fixed wireless access subscriber unit containing a wireless transceiver and a telephone subscriber line interface circuit which supports privacy and remote release of hold between the subscriber...
5995852 Communication terminal equipment and call incoming control method  
In a communication terminal equipment and in a method of controlling call incoming, unnecessary noises in a period from the start of an alert sound to carrying out of the next operation can be...
5991604 Ring detecting circuit and method for wireless/wired composite telephone  
In a circuit for notifying ring signal reception to a wireless telephone in a wireless/wired composite telephone system having a direct-current (DC) blocking circuit for blocking a DC component...
5963639 Telephone having an audio response function  
A microphone system is provided for picking up ambient sounds including noises and for producing a sound voltage signal. A threshold is obtained from the sound voltage signal for determining a...
5960075 Switchmode power converters for telephone subscriber line interface circuits  
A power converter forming part of a telephone subscriber line interface circuit selectively generates a ringing signal waveform, for supply to the line, or a supply voltage for a driver circuit for...
5940501 Counter based ringer interface  
The present invention comprises a ringer interface circuit for generating a ringer signal for controlling a telephone ringer. The circuit of the present invention includes a first frequency...
5909488 Communication apparatus having a non-ringing call receiving mode and an energy-saving stand-by mode  
A communication apparatus has a power saving stand-by mode for reducing power consumption during stand-by and a non-ringing call receiving mode for communication without ringing an attached...
5901219 Method for ring signal detection  
A reduced complexity method of ring signal detection, in which a digital signal processor monitors an incoming data stream for zero crossings and employs a limiter-discriminator to differentiate...
5892817 Wireless system for alerting individual to incoming telephone call  
A system for alerting some individuals in a large open space such as a store or restaurant to an incoming telephone call, but that avoids disturbing other individuals by loud ringing. Individuals...
5889853 Adjustable-period dual-tone multifrequency generator  
An adjustable-period dual-tone multifrequency (DTMF) generator, which includes a plurality of programmable counters or up/down counters, a control unit, a memory unit for storing data, a digital...
5878131 Interference attenuation for acoustic-dialers  
Acoustic dialers are widely used to dial telephone numbers by generating a pair of DTMF tones for each key being depressed. Non-linearities in telephone systems, acoustic dialer loudspeakers, and...
5844983 Method and apparatus for controlling a telephone ring signal  
A telephone has a receiver, a transmitter, a control interface, an audio processor and a microprocessor. The audio processor includes a digital signal processor, an input audio unit coupled to a...
5838788 Telephone ringing signal generator  
A telephone ringing signal generator includes a DC converter for producing high positive and negative voltages that define peak amplitudes of the ringing signal, which is produced by low pass...
5835582 Telephone call alerting system and information processing system used in such  
A telephone call alerting system is applied to a telephone communication system accommodating a line to which a telephone terminal is connected, a plurality of telephone numbers being assigned to...
5818929 Method and apparatus for DTMF detection  
The total energy of a signal that has entered from a telephone line is detected before the signal is applied to an AGC circuit. After the signal is applied to the AGC circuit, the energy of a DTMF...
5818923 System and method for supressing pulse dialing feedback occurring particularly with auxiliary acoustic ringers in socket telephone systems  
An acoustic feedback suppression system, particularly for auxiliary ringers in socket telephone systems, comprising a first terminal and a second terminal of a telephone line, an internal ringer,...
5809134 Telephone interface circuit with impedance termination during call pauses  
A telephone interface circuit with impedance termination during call pauses, comprising first and second terminals to connect to a telephone line and a line termination branch connected to the...
5790654 Digitally controlled ring signal generator  
A space and power efficient digitally controlled, all solid state, DC to AC converter powered by low voltage DC, typically found in logic circuits, that generate a high voltage low frequency AC...
5781626 Communication device capable of controlling transmission parameters of outputted DTMF signals  
A communication device, such as a telephone or a facsimile device, includes an input device for inputting code information for a call to be transmitted through a communication network, a...
5768363 Programmable timer circuit for the signal generator of a communication device  
A programmable timer circuit having ON and OFF volume control states; for controlling the volume of audible signals generated by a signal generator of a communication device at preprogrammed times...
5764751 Portable telephone set with a vibrator having an automatic switching function  
In a portable telephone set comprising a receiver for generating an audible tone, a vibrator for vibrating the portable telephone set mechanically, and a radio section for receiving an incoming...
5764752 Off-hook telephone clearing system  
An off-hook telephone clearing system for a telephone line having at least two telephones connected thereto, comprising a howler tone detector connected to each telephone, and a telephone...
5712911 Method and system for automatically activating and deactivating a speakerphone  
A novel telephone system and method for activating a speakerphone in response to an incoming call based upon the presence or absence of a subscriber within a predetermined proximity zone. The...
5692040 Method of and apparatus for exchanging compatible universal identification telephone protocols over a public switched telephone network  
A method of and apparatus for providing compatible universal identification telephone protocols by generating predetermined unique audio sequences recognizable by the telephone user as defining...
5673313 Telephone set of distinctive ringing type wherein pattern of telephone number call signal is registered for determination of telephone number being called  
A telephone set using two or more telephone numbers called by respective call signals having different patterns, which are stored in a pattern data memory when the call signals are received and...
5666406 Hazard prevention for telephone line interface circuits  
A telephone line interface circuit comprises a controlled voltage generator for selectively generating a ringing voltage waveform for a telephone line or a supply voltage for a drive circuit for...
5659608 Line feed circuit with logic level controlled ringing  
A line-feed circuit which is controllable by logic level control signals from a local microprocessor. One of the logic level signals is a 20 Hz clock signal with a duty cycle of 20 ms high and 30...
Matches 51 - 100 out of 259 < 1 2 3 4 5 6 >