Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 8081942 | Method and apparatus for muting based on a constant modulus indication A constant modulus indicator (CMI) measure is calculated for a received signal having a constant modulus component C and a noise component N. The CMI measure indicates a ratio of an energy of C to an energy of N. A determination of whether to attenuate a derived sig... | 12/20/2011 |
| 7907923 | Method and apparatus for squelch gating a receiving signal A method and an apparatus for squelch gating a receiving signal depending on the level of phase noise in said receiving signal determines sampled amplitudes and sampled phases of said receiving signal, determines sampled phase noise by differentiating subsequent sam... | 03/15/2011 |
| 7471938 | Power clipping circuit and power clipping method A power clipping circuit and method of the clipping circuit is provided. A power clipping circuit comprises, a selector which receives a baseband signal, and selects one of the baseband signal or a feed back signal, and outputs a selected signal, and a square clippi... | 12/30/2008 |
| 7460847 | Handheld audio system with radio receiver and method for use therewith A radio receiver, optionally used in conjunction with a handheld audio system, includes a radio stage for processing a received radio signal into an audio signal. An audio stage produces an audio output, based on the audio signal. An overload monitor detects an over... | 12/02/2008 |
| 7295631 | Stereo demultiplexer A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the modulated difference signal for a noise reduction. The proposed ster... | 11/13/2007 |
| 7263145 | Semiconductor integrated circuit device, wireless LAN system, and auto gain control system A wireless LAN system has auto gain control with no work load applied to its baseband processing block. When the wireless LAN system gets ready to receive a signal, the gain control circuit switches between the receiving antennas. The gain control circuit sets gain ... | 08/28/2007 |
| 7203471 | System and method for selectively utilizing an attenuation device in a two-way radio receiver based on squelch detect and radio signal strength indication (RSSI) A system and method used for controlling an attenuator in a two-way communication device (100, 200) includes the steps of measuring (211) a relative signal strength indication (RSSI) at the input of the two-way communications device. The RSSI measureme... | 04/10/2007 |
| 7151910 | Wireless microphone information displaying apparatus and method thereof The wireless microphone information displaying apparatus comprise a plurality of wireless microphones having information respectively assigned thereto, a wireless microphone supporting device having a plurality of supporting portion for supporting the microphones, r... | 12/19/2006 |
| 7142818 | Systems and methods for reducing radio receiver interference from an on-board avionics transmitter Systems and methods for reducing interference in an enhanced radio receiver from a transmitter when both are located in the same aircraft are provided. The enhanced radio receiver detects and attenuates a signal from the transmitter, without attenuation or interfere... | 11/28/2006 |
| 7120408 | Differential signal squelch detection circuit and method An electrical circuit detects a “squelch,” or “out-of-band,” state of a differential signal pair having a positive (“p”) signal line and a negative (“n”) signal line. In one embodiment of the invention, a first and a second comparator each have posit... | 10/10/2006 |
| 7116959 | Apparatus for selecting a receiver among a plurality of receivers in a diversity receiver system based upon automatic gain correction A diversity receiver system includes a plurality of radio receivers that each provide a uniquely associated receiver output signal and a uniquely associated receiver control signal indicative of the amount of gain applied by the associated radio receiver to create t... | 10/03/2006 |
| 7096051 | Enhancing signals in a two-way radio system Embodiments of the present invention can be used to enhance signals in a peer-to-peer radio system, such as a two-way radio system. In one embodiment, the invention includes receiving a communications signal on a channel from a remote radio at a radio using a plural... | 08/22/2006 |
| 7085719 | Voice filter for normalizing an agents response by altering emotional and word content A method and apparatus are provided for adjusting a content of an oral presentation provided by an agent of an organization and perceived by a human target of the organization based upon an objective of the organization. The method includes the steps of detecting a ... | 08/01/2006 |
| 7082291 | Automatic gain control A method for controlling gain of an amplifier includes amplifying one or more received signals to produce one or more amplified signals. The method also includes generating a plurality of down converted signals using the one or more amplified signals. The method fur... | 07/25/2006 |
| 7027847 | Communications system and method, wireless communications system, wireless microphone and wireless receiver Herein disclosed a communications system according to the present invention comprises, a wireless microphone transmission apparatus for transmitting a radio microphone signal on a predetermined wireless microphone frequency channel carrying a voice signal and a tone... | 04/11/2006 |
| 7012552 | Civil aviation passive coherent location system and method A civil aviation passive coherent location system and method is disclosed. A receiver subsystem receives reference transmissions from an uncontrolled transmitter. The receiver subsystem also receives scattered transmissions originating from the uncontrolled transmit... | 03/14/2006 |
| 7010328 | Wireless communications system, wireless microphone transmission apparatus, and wireless receiving apparatus Herein disclosed a communications system according to the present invention comprising: a wireless microphone transmission apparatus for transmitting a radio microphone signal on a predetermined wireless microphone frequency channel carrying a voice signal and a ton... | 03/07/2006 |
| 6961551 | Dual speed squelch circuit and method Squelch circuit and method useful in frequency-scanned radio receivers are provided. Generally, the squelch circuit includes an audio-removal filter coupled to receive an audio signal. The passband of the audio-removal filter is selected sufficiently high relative t... | 11/01/2005 |
| 6961550 | Radio receiver that changes function according to the output of an internal voice-only detector A radio receiver includes a voice-only detection mechanism that detects when the current radio station is transmitting mostly voice, and that changes the function of the receiver depending on whether or not the current radio station is transmitting mostly voice. In ... | 11/01/2005 |
| 6950641 | Apparatus, and an associated method, for increasing receiver sensitivity of a direct conversion receiver Apparatus, and an associated method, for a direct conversion receiver by which to selectably increase the sensitivity of the receiver. The direct conversion receiver includes a baseband amplifier positioned in front of a baseband filter, and coupled to receive a dir... | 09/27/2005 |
| 6947716 | Antenna switching apparatus An antenna switching apparatus which detects an antenna of good reception with high precision and suppresses control errors in antenna switching. A comparator compares a noise component obtained from a selected antenna with a threshold for noise detection. When nois... | 09/20/2005 |
| 6931081 | Antenna diversity receiver An antenna diversity receiver is disclosed. The diversity receiver has a multipath detector for controlling an antenna selective switching circuit. The switching circuit couples one of a plurality of antennas to a RF receiver input. The receiver allows suppression o... | 08/16/2005 |
| 6914940 | Device for improving voice signal in quality Provided is a device for improving voice signal in quality by discriminating a radio environment of a signal transmission path and detecting a click noise. The device for improving voice signal in quality calculates an average value for a short interval of a receive... | 07/05/2005 |
| 6775527 | Squelch circuit with adjustable reference level A squelch circuit with an adjustable reference level, having an input level comparator with a first, a second, a third and a fourth current input terminal, a first and a second input terminal, and an output terminal. A first current source is coupled between the fir... | 08/10/2004 |
| 6675002 | System and method for automatically muting cellular telephone devices in noise sensitive areas A system, apparatus and method for inhibiting the ringer of a cellular telephone within a noise sensitive area includes a transmitter for generating a control signal within the area. A receiver within the cellular telephone generates a mute signal during ... | 01/06/2004 |
| 6671503 | Wireless microphone system There is provided an improved receiver unit for wireless microphone system. The receiver unit accomplishes desirable mute control in accordance with state transmitting conditions of electric wave from a wireless microphone. The receiver unit includes a re... | 12/30/2003 |
| 6671504 | Radio squelch techniques A radio carrier signal is detected (20) after being converted to digital form and is filtered (22). A noise estimator (24) generates a noise estimate signal by estimating the noise in the detected signal due to atmospheric conditions and the noise due to ... | 12/30/2003 |
| 6564041 | System and method providing improved FM carrier squelch system An improved squelch system (10) is provided in accordance with the present invention. The system includes a high-deviation subsystem (20) to detect a carrier with modulation, and a low-deviation subsystem (30) to detect the carrier with minimal modulation... | 05/13/2003 |
| 6522899 | Muting method in radio communication terminal A muting method for a radio communication terminal. The method comprises setting a mute function; upon detection of a ring signal, muting bell and vibration; storing in a memory an absent message representing that there was a call during absence; and disp... | 02/18/2003 |
| 6456833 | Method for noise reduction in the reception of RF FM signals A method for noise reduction during FM reception and a receiver executing the method. A detected audiosignal is being attenuated. A field strength indicative muting control signal is derived from an IF signal which is used to control an attenuation of the... | 09/24/2002 |
| 6397049 | Two-way radio with improved squelch A two-way radio (1) that has a radio frequency receiver (2) having a modulated radio frequency signal output and a variable bandwidth filter (3) with an input coupled to the modulated radio frequency signal output. The radio (1) also has demodulator circu... | 05/28/2002 |
| 6397050 | Multiband squelch method and apparatus A squelch circuit for a radio receiver that detects the presence of speech by utilizing a filter bank for filtering an intermediate frequency or baseband signal from the radio receiver into band-pass signals, detecting the magnitude of the band-pass signa... | 05/28/2002 |
| 6385440 | Mobile communication receiver with asymmetric muting control A mobile communication receiver generates an audio signal from a radio signal received on a communication channel, detects conditions on the communication channel, mutes the audio signal according to a first rule when the channel conditions are bad, and u... | 05/07/2002 |
| 6373398 | Automobile tuner system In a receiver, either an FM/AM signal to be used for a keyless entry system or a high frequency signal to be used for an automobile audio system for FM broadcast is applied to a first converter. An IF limiter amplifier amplifies the output signal of the c... | 04/16/2002 |
| 6374095 | Method and apparatus for providing a squelch function on narrow band radio receivers Squelch circuitry for narrow band audio receivers which uses a sub-audible tone or coded signal to modulate the intermediate frequency in accordance with the presence of a desired broadcast signal and then detects the sub-audible tone frequency or coded s... | 04/16/2002 |
| 6334060 | Multi-channel or split-frequency, low frequency, telemetry circuit and method between transmitters and receivers A multi-channel system is provided for both wide-band and narrow band low frequency transmission/reception of digital telemetry. The multi-channel system uses coherent detection having a high selectivity, and a quadrature detector having a high sensitivit... | 12/25/2001 |
| 6304828 | System and method for calibrating a signal detection threshold circuit The system and method for calibrating a signal detection threshold circuit is used in a radio frequency (RF) receiver, such as a in an early warning radar (EWR) system, in which a signal detection threshold circuit rejects signals below a predetermined th... | 10/16/2001 |
| 6259904 | Fast squelch circuit and method A technique is used by a squelch circuit (200) that generates a fast squelch. The technique involves generating a noise signal (211) from a demodulated signal (105), generating a squelch check request (405) of one of two types, performing a release (410) ... | 07/10/2001 |
| 6233443 | Apparatus and method for reducing co-channel radio interference An apparatus and method reducing interference between multiple frequency modulated, FM, voice transmissions present in the same frequency bandwidth by receiving a radio signal which includes a first FM voice signal to be demodulated along with one or more... | 05/15/2001 |
| 6205130 | Method and apparatus for detecting bad data packets received by a mobile telephone using decoded speech parameters The mobile telephone detects bad data packets by decoding speech parameters represented by the packets and comparing those speech parameters against acceptable ranges of speech parameters. If the speech parameters do not lie within the acceptable ranges, ... | 03/20/2001 |
