Class 367/102 - Linear modulation (e.g., sawtooth)

Subclass of Class 367 - Communications, electrical: acoustic wave systems and devices
Definition: Subject matter in which the frequency increases or decreases
No. of patents: 33
Last issue date: 09/18/2007

Number	Title	Issue Date
7271761	Distance calculating method and system In a system, a frequency-modulating unit is configured to frequency-modulate a radar wave signal within a predetermined frequency modulation range from bottom to top so that a frequency of the frequency-modulated radar wave changes in time. The rate of frequency cha...	09/18/2007
7193555	System and method for detecting emitter signals in the presence of unwanted signals A method for receiving at least one signal emitted by at least one emitter includes defining a first dwell associated with a first signal. The first dwell has a frequency range that overlaps at least a portion of a frequency range of a second signal. The method also...	03/20/2007
7132928	Threat detection system interface A threat detection system interface that provides translates threat diction information into a tactile signal for a user to indicate the direction and distance of an identified threat relative to an object. The threat detection system interface having applications f...	11/07/2006
7023331	Peripheral monitor for monitoring periphery of vehicle The invention solves a problem of fluctuation in performance in the conventional peripheral monitor for monitoring periphery of a vehicle that measures a distance to other vehicle or any other object by transmitting radio waves and informs a driver of the distance d...	04/04/2006
6919804	Passenger detection system for vehicles A passenger detection system is provided for a vehicle having at least one opening to allow passengers to enter and exit the vehicle. The passenger detection system includes a plurality of passenger detection devices placed on opposed sides of the at least one openi...	07/19/2005
6678210	Frequency division beamforming for sonar arrays A sonar array for forming multiple transmit and/or receive acoustic beams by a frequency beamforming technique. In frequency division beamforming, beam steering direction is made a function of frequency by driving (receiving) each element of a uniformly s...	01/13/2004
6087981	Method for pulse compression with a stepped frequency waveform The present invention relates to radars and sonars, and more particularly to a synthetic-band technique of pulse compression making it possible to reach a very high distance resolution. Synthetic band consists in transmitting a waveform pattern consisting...	07/11/2000
6011754	Personal object detector with enhanced stereo imaging capability A personal object or obstacle detector apparatus with enhanced stereo imaging capability includes a sonar system having dual receivers with field lobes positioned based on psychoacoustic considerations such as interaural intensity difference (IID) and int...	01/04/2000
5963509	Method and device for distance measurement In a distance measurement to an object, the distance measurement operating according to the FMCW principle, a linear frequency-modulated signal is transmitted and mixed with the signal reflected back from the object, generating a demodulation signal with ...	10/05/1999
5724313	Personal object detector A personal object or obstacle detector apparatus comprises a continuous transmission frequency modulation (CTFM) ranging system and an audio output device. The CTFM ranging system transmits a frequency-swept pressure wave, receives a reflected frequency-s...	03/03/1998
5298962	Pulse compression signal processor utilizing identical saw matched filters for both up and down chirps A pulse compression signal processor (10) for a laser radar system which utilizes substantially identical negative slope SAW matched filters (30,44) for compressing both the up and down chirps of a bi-directional echo signal (14). The signal processor (10...	03/29/1994
5212489	Echo ranging system for detecting velocity of targets using composite doppler invariant transmissions Target velocity and range are measured with high resolution in an echo ranging system (sonar or radar) using composite Doppler invariant signals consisting of at least two segments, such as "rooftop" or "vee" HFM signals, such composite signals having amb...	05/18/1993
5212490	Echo ranging system for detecting velocity and range of targets using composite doppler invariant-like transmissions with suppression of false targets False target (reverberation, clutter, etc.) detection is suppressed in an echo ranging system (sonar or radar) in which target velocity and range are measured using a composite Doppler invariant-like signal having at least two segments, such as are presen...	05/18/1993
4960329	Chirp pulse echo ranging apparatus The difficulty of making Doppler shift velocity measurements in a chirp pulse echo ranging system is overcome by employing a pulse frequency compression filter, suitably a SAW compressor 45, having individual outputs 64, 65, 66, 67 respectively relating t...	10/02/1990
4926693	Contactless actuator piston proximity sensor This invention relates to contactless proximity sensing transducers and more particularly concerns a single crystal ultrasonic interferometer comprised of a piezoelectric crystal attached to a Pyrex plate for acoustic impedance matching purposes. When dri...	05/22/1990
4812035	AM-FM laser radar A laser radar system wherein a beam of continuous wave (CW) electromagnetic energy is generated with frequency modulation (FM) and amplitude modulation (AM) being imposed thereon to produce an amplitude and frequency modulated, continuous wave beam of ene...	03/14/1989
4674069	System for collecting and processing data relating to moving bodies An ultrasonic wave signal having its frequency varied continuously is transmitted from an ultrasonic wave transmitter toward a moving body. The wave reflected from the moving body is received by an ultrasonic wave receiver, and the resulting signal is fre...	06/16/1987
4613231	Laser range finder with non-linearity compensation The receiver (3') of a laser range finder operating on the pulse propagation and including a transmitter unit (1) and a first receiver unit (2) is sampled by a spike pulse (5) derived from the transmitter pulse in such a way as to produce a low-frequency ...	09/23/1986
4472793	Data selector circuit with channel skipper for data acquisition system The data selection circuit includes a multiplexer circuit which receives a plurality of inputs and individually connects each of the inputs to an output line. The multiplexer is sequenced by signals from a timing circuit which causes inputs having a highe...	09/18/1984
4449209	Utilization of entire transmitted bandwidth in continuous transmission FM sonar A continuous transmission FM sonar avoids target ambiguities while utiliz the entire transmitted bandwidth for echo analysis. The sonar is characterized by digital generation of direct and quadrature versions of the transmitted frequency sweep, and balan...	05/15/1984
4398275	Linear frequency sweep generator for continuous transmission FM sonar A device for producing a varying frequency sine wave synthesized so that frequency is swept linearly with time for use in a continuous transmission FM sonar. A crystal clock, divider and a 16 bit digital output sweep counter produce 216 count...	08/09/1983
4310903	Method of and apparatus for providing information as to the existence or position of objects A method of and apparatus for locating an object by stress wave energy reflection in which the wave energy is transmitted as a beam by transmitting transducer elements, and is scanned through successive sectors of a field of view by imposing differential ...	01/12/1982
4292678	Method of and apparatus for echo location of objects A method of locating an object by wave energy reflection and an apparatus therefor in which receiving outer transducers provide directional receptivities represented by polar lobes diverging on opposite sides of a reference axis and an inner receiving tra...	09/29/1981
4287578	Method for shaping and aiming narrow beams A method and apparatus is disclosed for use of a linear frequency chirp in a transmitter/receiver (14/16) having a correlator to synthesize a narrow beamwidth pattern from otherwise broadbeam transducers when there is relative velocity between the transmi...	09/01/1981
4279019	Method and apparatus for delay analysis of energy transmitted through a medium A method and apparatus is disclosed for determining the manner by which an initial injection of wave energy is modified by a medium under test using a time delay spectrometer (TDS) and a fast Fourier transform (FFT). A switch allows either the time delay ...	07/14/1981
4275460	Real-time audio spectrum analyzer A propeller modulation enhancement and display system which suppresses hull cho and displays propeller modulation of a return sonar signal in real time. The real-time operation is obtained through the use of a multichannel frequency spectrum analyzer havin...	06/23/1981
4253166	Target location systems A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship and means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb respecti...	02/24/1981
4245220	Target location systems A target location system comprising a signal transmitter arrangement for transmitting pulses the frequency of which increase progressively during each pulse period from a frequency f to a frequency f+Ɗf and an echo signal receiver arrangement comprising ...	01/13/1981
4052977	Methods of and apparatus for ascertaining the characteristics of motion of inaccessible moving elements A method and apparatus for obtaining an audible signal containing information as to the characteristics of at least one moving element situated internally of a living body and in which a transmitting transducer fed with an electrically generated signal of...	10/11/1977
4038612	Swept oscillator automatic linearizer A device for generating a repetitive, highly-linear, frequency ramp. A voltage controlled oscillator responds to a ramp generator to produce the desired frequency modulation, and means are included for modifying the ramp amplitude vs. time shape as a func...	07/26/1977
3997866	Acoustic bus passenger counter A system for detecting and counting entry and exit of passengers. Transmitted high frequency sound beams define at least two zones through which passengers pass in sequence when entering or leaving a vehicle; the motion of a passenger through the zones pr...	12/14/1976
3987403	Sensory aids for the blind A sensory aid for the blind in which a frequency swept ultra-sonic carrier signal is generated and radiated as acoustic energy from a head set and reflected acoustic energy is received by two spaced apart receiving transducers which feed a two channel rec...	10/19/1976
3939463	Acoustic transponder navigation system 1. In combination in an acoustic obstacle detection and navigating system; A transmitting station comprising a variable frequency oscillator, a sawth generator coupled to said oscillator for sweeping the frequency of oscillations through the range of frequenc...	02/17/1976

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Class 367/102 - Linear modulation (e.g., sawtooth)