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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 7295617 | ADPCM decoder A shift register receives a quantization difference signal separated into a mantissa part and an exponent part and bit-develops the mantissa part. A shift arithmetic operation control circuit bit-shifts the bit-developed mantissa part in accordance with a value of t... | 11/13/2007 |
| 7180950 | Low-noise feedback cancellation filter for enhanced common-mode rejection and noise immunity A circuit is connected between a module and a pair of wires. The circuit includes a first connection line, a second connection line, radio frequency termination circuitry, a first transformer, a second transformer, a tapped inductance and a feedback cancellation fil... | 02/20/2007 |
| 7180933 | Squelch circuitry for high speed high frequency operation A squelch circuit for operating at high speed and at high frequencies includes a squelch input unit, a low swing pre-amplifier and a sampling and decision circuit. The squelch input unit pre-processes the positive and negative signals of an input signal to generate ... | 02/20/2007 |
| 7170955 | Method and apparatus for accurately detecting presence of a valid signal A method and apparatus for accurately detecting the presence of a valid signal includes processing that begins by determining the energy level of an input signal in real time to produce a real time energy level. The processing then continues by delaying the input by... | 01/30/2007 |
| 7058568 | Voice quality improvement for voip connections on low loss network The type of audio stored in the payload of a data packet transmitted over a data network is identified as speech audio or non-speech audio through the use of a non-speech identifier included in a header in the data packet. Upon detection of data packet containing no... | 06/06/2006 |
| 7054424 | Audio conferencing method using scalable architecture An audio conferencing apparatus and method. The apparatus includes a data bus, such as a TDM bus, a controller, and an interface circuit that receives audio signals from a plurality of conference participants and provides digitized audio signals in assigned time slo... | 05/30/2006 |
| 7039193 | Automatic microphone detection Whether a microphone is connected to a real-time audio communication system of a computer may be detected by recording an audio sample through the real-time audio communication system, filtering a DC component is filtered out of the audio data, recognizing a pattern... | 05/02/2006 |
| 7003053 | Digital broadcast receiver The invention provides a digital broadcast receiver which comprises a tuner 1 for selecting the desired broadcasting station from among a plurality of broadcasting stations, a demodulator circuit 3 for decoding a plurality of bit frames constituting th... | 02/21/2006 |
| 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 |
| 6961548 | Method for masking interruptions on playback of received radio signals A method of masking interruptions in the playback of received radio signals is provided, in which lengthy interruptions are allowed only when modulation of the radio broadcast program currently being received is recognized as speech, and a modulation pause in the re... | 11/01/2005 |
| 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 |
| 6480532 | Echo cancellation for an ADSL modem An echo cancellation functionality taps a digital transmit signal from a transmit channel for processing through an adaptive filter of an echo channel to generate an echo cancellation signal. The adaptive filter has a transfer function substantially match... | 11/12/2002 |
| 6212245 | Communication apparatus The high-frequency component removing circuit is immediately started, and is not stopped unless the measurement value of the received electric intensity has maintained a value equal to or higher than the filter level for 1 sec after the high-frequency com... | 04/03/2001 |
| 6208700 | Apparatus for processing a signal received via an information carrier The invention relates to an apparatus for processing a signal received via an information carrier. The apparatus comprises a receiving unit (2) for receiving a signal from the information carrier, an equalizer (8) for equalizing the signal thus received, ... | 03/27/2001 |
| 6061096 | Digital-and-analog-TV-signal receivers, each with single first detector and shared high-band I-F amplification Radio receivers for receiving DTV signals, in accordance with the Advanced Television System Committee (ATSC) standard, or analog TV, in accordance with the National Television Systems Committee (NTSC) standard, each use a single first detector for both t... | 05/09/2000 |
| 6049565 | Method and apparatus for audio communication Audio communication apparatus which facilitates reduction of data network traffic. The communication apparatus distinguishes between voice activity and silence or background noise. Upon termination of voice activity the apparatus output the contents of it... | 04/11/2000 |
| 6047036 | System and method for implementing a mute voice signal upon reception of a ADPCM zero nibble in wireless communications A system and method of muting a voice signal in a wireless communication system when an "all zeros" condition of a digitized serial voice input signal is detected. The mute signal which is generated when a zeros condition occurs is provided to a voice pro... | 04/04/2000 |
| 6011806 | Cellular telephone communication protocol A cellular telephone communication protocol enables a communication link primarily for the transmission of voice and data. At predetermined intervals or on-demand data regarding location, an event, or a condition is sent by muting the voice audio and send... | 01/04/2000 |
| 5881101 | Burst serial tone waveform signaling method and device for squelch/wake-up control of an HF transceiver A device and method for controlling HF single side band radio squelch operation in which a serial tone burst indicates the start and end of a transmission and identifies an on-going transmission. Additionally, receivers in a power saving sleep mode can be... | 03/09/1999 |
| 5844938 | Carrier based data operated squelch A method for providing improved carrier based data operated squelch (CDOS) includes routines for recovering the carrier signal and for analyzing the received signal. The received signal is sampled at each transition point of the carrier signal as well as ... | 12/01/1998 |
| 5615412 | Digital squelch tail system and method for same A digital squelch tail system (120, 114) selectively attenuates audio output corresponding to a digital signal (156). A bit error rate estimator (210) generates bit error rates (201) for an input digital signal (156). A digital filter (220) coupled to the... | 03/25/1997 |
| 5598431 | Method and apparatus for signal quality detection in a communication system A signal quality detector (200) determines the quality of an incoming received data signal within a communication device (100). The audio output of the communication device is muted and unmuted according to the decision of the signal quality detector (200... | 01/28/1997 |
| 5598430 | Analog/digital receiver An analog/digital receiver comprises a noise detecting circuit for checking whether a noise component, output from an analog signal detecting means, is not less than a specified value, and an RSSI detecting circuit for checking whether received signal str... | 01/28/1997 |
| 5490166 | Data muting method and apparatus using delay circuits for communication systems A receiver 700 having an audio output device 326 is disclosed. The receiver 700 receives a carrier signal modulated with data, voice, or a combination of both. The receiver 700 includes a demodulator 708 for demodulating the received carrier signal. The d... | 02/06/1996 |
| 5465404 | Communications receiver with an adaptive squelch system A wireless communications receiver having an adaptive squelch system and operable in multiple states including a receiver (11) that provides a received signal when operating in a clear (unscrambled) state and when operating in a secure (scrambled) state; ... | 11/07/1995 |
| 5285481 | Receiver circuit with smart squelch A receiver circuit relies on four novel pulse width timer/integrators to filter input data signals having a frequency less than a preselected maximum and greater than a preselected minimum. The circuit also rejects a single sine wave cycle. If an input pu... | 02/08/1994 |
| 5263049 | Method and apparatus for CMOS differential drive having a rapid turn off An integrated media attachment unit (MAU) operative for interfacing Digital Terminal Equipment (DTE) on a Local Area Network (LAN) using twisted pair media. The twisted pair function as either a DTE MAU or a repeater MAU. A line driver for the twisted pai... | 11/16/1993 |
| 5151922 | Variable speaker muting based on received data A method and an apparatus for controlling a speaker mute time is provided to transmit an information message from a first communication device to a second communication device. In response to receiving the information message, the second communication dev... | 09/29/1992 |
| 5109525 | Two-way radio with voice storage A two-way radio includes a receiver having a squelch circuit for determining if a communication channel is available. A transmitter is provided for transmitting voice messages on the channel. When the communication channel is available, voice signals are ... | 04/28/1992 |
| 5063597 | Muting circuit in a digital audio system A muting circuit in a digital audio system having a digital signal processor, a first latch, a second latch, a comparator for comparing data in the first and second latches, an address encoder, a counter, a memory, a divider, a multiplier and a switching ... | 11/05/1991 |
| 5001703 | Spectrally efficient TDM duplex communication system An improved duplex time division multiplexed (TDM) communication system is provided while conserving spectrum and efficiency. To accommodate two voice signals on one channel, the time allocated in a channel for brief listener voice acknowledgements is sho... | 03/19/1991 |
| 4748685 | Mobile radio communications system A vehicle mounted mobile transceiver (11) communicates via a secondary mobile unit (51) with a short range portable unit (10). The portable unit (10) can be either a cordless microphone or a transceiver. The portable unit (10) allows a remotely positioned... | 05/31/1988 |
| 4663765 | Data muting method and apparatus for audo-digital communications systems An audio muting device for use in a transceiver which receives digital data preceded by a dotting pattern uses a detection/decoder for detecting the non-audible dotting pattern and a controller for actuating a muting switch whenever the dotting pattern is... | 05/05/1987 |
| 4431991 | Encoder for transmitted message deactivation code An encoder for transmission of a digital deactivation code at the end of a variable length message transmission. The encoder adds a deactivation code to the end of an operator's transmitted message in order to inform the designated message receiving devic... | 02/14/1984 |
| 4430742 | Data muting method and apparatus for radio communications systems Data muting apparatus is described that mutes variable-length data signals communicated between a central station and mobile and portable radios in a dispatch radio communications system. The central station includes a base station transceiver, a dispatch... | 02/07/1984 |
| 4423416 | Decoder for transmitted message deactivation code A decoder for receiving a transmitted message followed by a digital deactivation code is described. To prevent unnecessary utilization of a broadcast channel, the decoder responds to a digital deactivation code received at the end of a variable length ana... | 12/27/1983 |
| 4418416 | Frequency modulation transmitter for voice or data A portable frequency modulation transmitter (1) for voice or data is disclosed for operation at infrared frequencies. The transmitter comprises keyboard (200) or microphone (402) input capability and dual modes of use. In the data mode, carrier is generat... | 11/29/1983 |
| 4344175 | Muting circuit A muting circuit detects data transitions during windows generated from received data, and counts the number of such transitions during the windows. A muting signal is produced in response to a predetermined count. If a transition occurs outside a window,... | 08/10/1982 |
| 4323730 | Idle channel noise suppressor for speech encoders The idle channel for a speech encoder is detected by the detection, at the encoder comparator output, of zero-level traversals caused by noise transient signals appearing at the analog input of the encoder. In response to the detection of an idle channel,... | 04/06/1982 |
| 4038604 | Signal to noise ratio indicating circuit A radio receiver squelch circuit responds to an IF carrier modulated by any of AM voice, AM pulse, CW, interrupted CW, or angle modulated signals. After the IF carrier is amplitude normalized it is supplied to a network for deriving a D.C. voltage having ... | 07/26/1977 |
