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Mountable Printable Placard With Headband
A resilient headband in a shape for being mounted on the head of the user. The headband is equipped with a longitudinal slotted member for holding a placard.
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| Number | Title | Issue Date |
| 7209529 | Doppler compensated receiver A receiver includes a controller which receives A/D sampled input signals and shifts the sampled digital signal to compensate for Doppler effect in the input signal prior to demodulation. The controller compensates for a Doppler increased frequency by shifting the s... | 04/24/2007 |
| 7027357 | Acoustic communication device and acoustic signal communication method The present invention provides an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound. Each of the plurality of pulse signals is a signal of at least one modulated carrier wave, which has a predetermined frequency. The carrier wa... | 04/11/2006 |
| 6965753 | Apparatus for performing doppler correction in a wireless communications system Apparatus for Doppler correction in a wireless communications system, including a first frequency synthesizer for generating a carrier signal oscillating at a rate responsive to a first input, a counter coupled to the first input for generating a Doppler compensatio... | 11/15/2005 |
| 6778467 | Underwater sounding apparatus A mixer shifts the center frequency of a received signal to a baseband according to a center frequency detected by a center frequency detector or a center frequency estimated from ship speed, for example, by a center frequency estimator. The passband of a variable p... | 08/17/2004 |
| 6687188 | Underwater telemetry apparatus and method An apparatus for phase coherent underwater communications includes a transmitter; a receiver, including a processor for jointly performing coherent diversity combining, carrier recovery, channel equalization and synchronization; and an antenna array that ... | 02/03/2004 |
| 6512720 | Underwater telemetry method using doppler compensation A method for Doppler compensation in a phase coherent underwater communications system includes the steps of receiving a communications signal from a plurality of underwater communications channels, where the signal consists of a sequence of raw data; the... | 01/28/2003 |
| 6130859 | Method and apparatus for carrying out high data rate and voice underwater communication An underwater apparatus for transmitting and receiving high rate data and voice communication including a transmitter, a receiver, and a Doppler frequency shift compensator. The transmitter includes a data source comprising digital data to be transmitted ... | 10/10/2000 |
| 6072425 | Terrain bias compensator for doppler navigation systems A terrain bias compensator for a Doppler navigation system utilizes an auxiliary beam with each beam of the Doppler system to form Doppler beam pairs. The axis of the auxiliary beam is slightly offset from the axis of the main beam and is positioned so th... | 06/06/2000 |
| 5923281 | Terrain bias compensator for doppler navigation systems A terrain bias compensator for a Doppler navigation system utilizes an auxiliary beam with each beam of the Doppler system to form Doppler beam pairs. The axis of the auxiliary beam is slightly offset from the axis of the main beam and is positioned so th... | 07/13/1999 |
| 5805526 | Echo detection doppler gate An automatic control system is disclosed herewith which causes the notch ter incorporated in a sonar system or any other appropriate utilization apparatus to be electrically by-passed in response to a predetermined minimum doppler present within a data s... | 09/08/1998 |
| 5754497 | Method for locating structure-borne sound events in pressure enclosures to be monitored in power plants A method for locating structure-borne sound events in pressure enclosures to be monitored in power plants, includes positioning sensors at various locations on a pressure enclosure. Signals are picked up with each of the sensors upon arrival of a sound wa... | 05/19/1998 |
| 5732044 | System and method for compensating for doppler shifts in signals by downsampling A signal shift compensation system and method compensates for a shift in a ignal, such as a Doppler shift in an acoustic signal. The system includes a signal sampler for oversampling the shifted signal at a fixed oversampling rate to establish an oversampl... | 03/24/1998 |
| 5519402 | Doppler shift compensation apparatus A Doppler shift compensation apparatus for compensating Doppler frequency shifts in an incoming signal to reproduce a highly accurate signal. The Doppler shift compensation apparatus has high frequency dissolution ability and can detect a frequency, an am... | 05/21/1996 |
| 5428581 | Method for compensating for the movement of the antenna for a sonar The invention relates to towed sonars. It consists in compensating electronically for the movement of the antenna in order to suppress the Doppler shift of the fixed echoes. In order to do that in a towed linear antenna (203) comprising N sensors (205), M... | 06/27/1995 |
| 5337053 | Method and apparatus for classifying targets A method and apparatus for classifying objects based upon information conned in the fourth order cumulant derived from energy from the object. Successive pulse returns in active systems and samples in passive systems are converted into vectors based upon... | 08/09/1994 |
| 5184241 | Doppler shift compensation system for laser transmitters and receivers A laser transmitting and receiving system includes doppler compensation for large doppler shifts in frequency caused by relative motion between a collocated transceiver and a target or relative motion between separated transmitters and receivers. The syst... | 02/02/1993 |
| 5130952 | Broadband adaptive doppler estimator and canceller A broadband adaptive Doppler estimator and canceller is described for adaptively removing a moving source of near field primary interference that is masking a weaker target. The estimator and canceller employs a distributed field of sensors, through which... | 07/14/1992 |
| 5091890 | Method of extracting target range and Doppler information from a Doppler-spread signal A method of extracting target range and Doppler information from a Dopplepread signal is provided. An acoustic waveform is transmitted underwater and impinges upon a submerged Doppler-spread target. Doppler-spread sonar echoes resulting from the transmit... | 02/25/1992 |
| 5077702 | Doppler consistent hyperbolic frequency modulation Doppler insensitive waveforms, such as portions of hyperbolas having the same asymptotes, may be used to modulate pulses or sub-pulses of energy for probing a determined environment so that when the modulated energy is transmitted and received, the receiv... | 12/31/1991 |
| 4980868 | Sonar system A doppler compensated sonar system is disclosed as including a transmitter nd a receiver. The receiver of the disclosed preferred embodiment is a single channel receiver which incorporates a mixer and a narrow pass band filter connected in series therein. ... | 12/25/1990 |
| 4905211 | Precision doppler effect compensator A precision Doppler effect compensator provides Doppler compensation in astic transmission by simultaneously sending a known reference signal with an information signal. The information signal and reference signal undergo identical Doppler effects. The c... | 02/27/1990 |
| 4809235 | Method for removing doppler phase dispersion from seismic data The invention is a method of reducing phase distortion in a detected seismic signal resulting from Doppler shifting of the transmitted signal. An operator is convolved with the seismic data to correct the dispersion. The operator is determined for the par... | 02/28/1989 |
| 4712200 | Device for processing modulated signals received by a lateral sonar system A device for processing echoes back scattered from the surface of the sea bed in response to sound pulses transmitted by a fish towed while immersed, comprising at least one assembly for determining the components XC and XS of the co... | 12/08/1987 |
| 4586172 | Adaptable filtering device and method for filtering sonar signals to remove reverberation signals due to vehicle speed and trim and the sea surface and sea bottom An adaptable filtering device and method for filtering sonar signals to remove reverberation signals caused by the vehicle speed and trim and the sea surface and sea bottom. The vehicle itself has an antenna for transmitting and receiving sonar signals, a... | 04/29/1986 |
| 4428073 | Underwater depth telemetry An acoustic telemetry system and technique are disclosed for remotely meaing the underwater depth and descent rate of a hydrographic package. Analog signals indicative of hydrostatic pressure exerted on the package and related to its underwater depth are... | 01/24/1984 |
| 4349915 | Minimization of multipath and doppler effects in radiant energy communication systems Apparatus is disclosed for reproducing transmitted information which is subject to multipath delay spread effects and doppler frequency-shift effects. The information is transmitted as a series of modulated information pulses of differing nominal frequenc... | 09/14/1982 |
| 4316269 | Own doppler nullifier for sonar system There is described a digital sonar receiver having a novel beamformer, own doppler nullifier (O.D.N.), and adaptive time varied gain controller. The beamformer interrogates a multi-element transducer by utilizing an interleaved sampling scheme which sampl... | 02/16/1982 |
| 4274148 | Digital time-delay beamformer for sonar systems There is described a digital sonar receiver having a novel beamformer, own doppler nullifier (O.D.N.), and adaptive time varied gain controller. The beamformer interrogates a multi-element transducer by utilizing an interleaved sampling scheme which sampl... | 06/16/1981 |
| 4208734 | Underwater communication system 1. In combination, means to generate a first noise signal having predetermined characteristics, means to generate a second noise signal having predetermined characteristics different from that of said first noise signal, means to generate a carrier wave, ... | 06/17/1980 |
| 4207625 | Doppler compensator for heterodyne correlation devices 2. In a sonar communication system, a transceiver for receiving doppler sals, a local oscillator for producing a first output signal of given frequency, a translation resolver connected to said local oscillator for regulating said first output signal, a ... | 06/10/1980 |
| 4206510 | Automatic detection and classification device 1. In an automatic echo ranging system wherein sonar equipment transmits ses toward a target in predetermined and equal time intervals and receives background, dopplered and undopplered echoes which are produced as video output and audio output, the impr... | 06/03/1980 |
| 4204280 | Underwater signal discrimination system 1. In an underwater-target detection apparatus of the echo-ranging type wein a receiver signal, resulting from transmission of search pulses, comprises reverberation and at times a target echo, said reverberation presenting a frequency spectrum of greate... | 05/20/1980 |
| 4203164 | Secure sonar communication system A secure sonar communication system for transmitting and receiving intellnce signals within an aqueous medium comprising in combination means for generating an electrical pseudo random noise signal within a predetermined bandwidth, means connected to sai... | 05/13/1980 |
| 4200872 | Doppler compensated digital non-linear waveform generator apparatus A non-linear digital waveform generator apparatus utilizing a variable clock to produce a predistorted transmission signal which is opposite to the distortion that is produced by the target's velocity.... | 04/29/1980 |
| 4187491 | Doppler compensated PSK signal processor A Doppler compensated PSK signal processor which receives a plurality of sages from a sensor array and decodes each message for further data processing. The signal processor compensates for the Doppler shift in the message frequency due to the velocity d... | 02/05/1980 |
| 4169256 | Digitally controlled oscillator A digitally controlled oscillator is provided with a memory, storing the half periods Ti (i=1, 2, ..., n) of corresponding frequencies fi =1/(2Ti) to be generated, and with a digital feedback circuit, in which circuit the ... | 09/25/1979 |
| 4084148 | Object recognition system An object recognition system wherein, in order to derive the features of an object to-be-recognized such as shape and size from a reflected wave or echo, the ratio between a signal obtained by Fourier transforming a part of a transmitting wave for the obj... | 04/11/1978 |
| 4007331 | Apparatus for demodulation of relative phase modulated binary data A digital system is disclosed for demodulating relative phase-shift modulated binary data using a delay circuit to store one data bit period of sample bits for phase comparison with the next data bit period of sample bits, and a cascaded delay circuit of ... | 02/08/1977 |
| 3976968 | Underwater target detection apparatus 3. An underwater moving-target detection system comprising, in combination, eans for generating and projecting acoustic energy at an adjustable carrier frequency as generated, means for receiving resultant reflected acoustic energy including water reverber... | 08/24/1976 |
