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| Number | Title | Issue Date |
| 6996218 | FSK decoder for caller ID A device for processing a frequency shift keying (FSK) signal including caller ID information that comprises an analog-to-digital converter (ADC) converting the FSK signal into a digital FSK signal, the FSK signal further comprising a first frequency component, a se... | 02/07/2006 |
| 6990119 | Method and apparatus to facilitate a transparent service option transition A method and apparatus for allowing a transparent service option transition between at least two wireless communication devices (WCDs). A first communication between a first WCD and a second WCD is established using a first service option. At some point during the f... | 01/24/2006 |
| 6842447 | Internet protocol transport of PSTN-to-PSTN telephony services A system for transporting public switched network (PSTN) terminated signaling across an Internet protocol (IP) network includes a gateway between the PSTN and the IP network. The gateway receives a telephony signaling message from the PSTN and determines if the tele... | 01/11/2005 |
| 6813350 | Method and apparatus for detecting dual tone alerting signal in telephone systems An apparatus for detecting a dual tone alert signal in a telephone system capable of at least off hook mode operation includes a processing channel for each tone. Each channel consists of a bandsplit filter for extracting the tone of interest and attenuating the oth... | 11/02/2004 |
| 6801608 | Telephone incoming signal discriminator 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 s... | 10/05/2004 |
| 6791976 | Mobile-to-mobile DTMF signaling in tandem free operation A wireless communication method and arrangement that facilitates and allows a user at one end to send dual tone multiple frequency characters from one wireless unit to a second wireless unit completely within tandem free operation mode without changing to tandem ope... | 09/14/2004 |
| 6694010 | Recognition of a single frequency tone A fast-converging, computationally simple, method for recognizing a single frequency tone or a sinusoid in a signal without prior knowledge of the tone frequency. The method employs a second order or higher auto-regressive model and includes: (a) sampling... | 02/17/2004 |
| 6683948 | Device for automatically identifying DTMF and FSK for caller ID A device for automatically identifying DTMF and FSK system is disclosed. A signal detector is provided for detecting signals on a telephone line. A DTMF and a FSK decoders are provided for decoding DTMF and FSK signals, respectively. A microprocessor is a... | 01/27/2004 |
| 6683939 | Method and apparatus for logging DTMF phone symbols dialed from an extension A method and apparatus logs outgoing phone symbols dialed from an extension. To log the phone numbers, a switching network is coupled to the phone lines and passes a Dual Tone Multiple Frequency signal from the extension to a CODEC. The CODEC converts the... | 01/27/2004 |
| 6665350 | Method and system for improved analog signal detection A method and system for improved detection of analog signals, where the analog signals may be composed of one or more analog frequencies. In the method and system, an analog signal is received. A stream of data samples is created from the analog signal. B... | 12/16/2003 |
| 6456715 | Connecting a telephone A computer system is used with a telephone that is operable by a user to furnish a predetermined command. The processing unit and a control circuit. The central processing unit is connected to communicate with the interface port, and the control circuit i... | 09/24/2002 |
| 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 detector responsive to an output from a first station to a commun... | 08/20/2002 |
| 5907596 | Calling party identification device with message function A caller identification device attachable to a telephone line and having a message function includes a line interface coupled to the telephone line, a ring detector for detecting rings of an incoming telephone call, and a line monitor for receiving an inc... | 05/25/1999 |
| 5835572 | Customized, billing controlled call bridging system Method and apparatus for providing customized, billing-controlled call bridging services through a bridging node which includes a node interface for connection through incoming and outgoing telephone trunks to a carrier switch of a public switched network... | 11/10/1998 |
| 5828739 | Portable communication device for displaying a calling party to be called when actuated A portable telephone designed so that a person who found the portable telephone is able to communicate easily with the owner. If the person who found the lost telephone turns on a power source, a CPU 11 of the portable telephone reads out data of the name... | 10/27/1998 |
| 5604791 | Single line telephone answering system with access security features A versatile phone system, consisting of a base unit and one or more peripheral utility devices, is used on the user's premises to provide an effective and private means of telecommunication. A plurality of telephone numbers and names are stored in the mem... | 02/18/1997 |
| 5438618 | Vocal frequency suppression apparatus and method A vocal frequency suppression apparatus for suppressing selected portions of a vocal signal to prevent inadvertent control of components controlled by dual tone multi-frequency ("DTMF") codes. The vocal frequency suppression apparatus includes a DTMF code... | 08/01/1995 |
| 4873719 | Enhanced calling number delivery service system A process for a telephone system is disclosed which is associated with customer premises equipment, such as a telephone set or other receiving equipment which has a built-in or attached dual-tone multifrequency (DTMF) receiver-decoder chip connected to an... | 10/10/1989 |
| 4803717 | Automatic answering telephone with memory storage having storage indication and an alarm The present invention is directed to a method and system which is automatically responsive to transmitted DTMF signals containing messages received from, and corresponding to respective calling originators. The invention provides an indication to the user... | 02/07/1989 |
