USPC Patent Classifications

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Class 375 pulse or digital communications
uspcdescription
375/130375 pulse or digital communications/(130) spread spectrum
375/131375 pulse or digital communications/(130) spread spectrum (131) hybrid form
375/132375 pulse or digital communications/(130) spread spectrum (132) frequency hopping
375/133375 pulse or digital communications/(130) spread spectrum (132) frequency hopping (133) end-to-end transmission system
375/134375 pulse or digital communications/(130) spread spectrum (132) frequency hopping (133) end-to-end transmission system (134) having specific code acquisition or tracking
375/135375 pulse or digital communications/(130) spread spectrum (132) frequency hopping (135) transmitter
375/136375 pulse or digital communications/(130) spread spectrum (132) frequency hopping (136) receiver
375/137375 pulse or digital communications/(130) spread spectrum (132) frequency hopping (136) receiver (137) having specific code acquisition or tracking
375/138375 pulse or digital communications/(130) spread spectrum (138) time hopping
375/139375 pulse or digital communications/(130) spread spectrum (139) chirp
375/140375 pulse or digital communications/(130) spread spectrum (140) direct sequence
375/141375 pulse or digital communications/(130) spread spectrum (140) direct sequence (141) end-to-end transmission system
375/142375 pulse or digital communications/(130) spread spectrum (140) direct sequence (141) end-to-end transmission system (142) having correlation-type receiver
375/143375 pulse or digital communications/(130) spread spectrum (140) direct sequence (141) end-to-end transmission system (143) having matched-filter-type receiver
375/144375 pulse or digital communications/(130) spread spectrum (140) direct sequence (141) end-to-end transmission system (144) having multi-receiver or interference cancellation
375/145375 pulse or digital communications/(130) spread spectrum (140) direct sequence (141) end-to-end transmission system (145) having specific signaling for code synchronization
375/146375 pulse or digital communications/(130) spread spectrum (140) direct sequence (146) transmitter
375/147375 pulse or digital communications/(130) spread spectrum (140) direct sequence (147) receiver
375/148375 pulse or digital communications/(130) spread spectrum (140) direct sequence (147) receiver (148) multi-receiver or interference cancellation
375/149375 pulse or digital communications/(130) spread spectrum (140) direct sequence (147) receiver (149) having specific code synchronization
375/150375 pulse or digital communications/(130) spread spectrum (140) direct sequence (147) receiver (150) correlation-type receiver
375/151375 pulse or digital communications/(130) spread spectrum (140) direct sequence (147) receiver (150) correlation-type receiver (151) having saw or charge-transfer device
375/152375 pulse or digital communications/(130) spread spectrum (140) direct sequence (147) receiver (152) matched-filter-type receiver
375/153375 pulse or digital communications/(130) spread spectrum (140) direct sequence (147) receiver (152) matched-filter-type receiver (153) having saw or charge-transfer device
375/211375 pulse or digital communications/(211) repeaters
375/212375 pulse or digital communications/(211) repeaters (212) ring or star configuration
375/213375 pulse or digital communications/(211) repeaters (213) testing
375/214375 pulse or digital communications/(211) repeaters (214) including pulse regeneration or conversion
375/215375 pulse or digital communications/(211) repeaters (214) including pulse regeneration or conversion (215) phase locked loop
375/216375 pulse or digital communications/(216) apparatus convertible to analog
375/217375 pulse or digital communications/(216) apparatus convertible to analog (217) muting circuit and squelch
375/218375 pulse or digital communications/(218) earth or water medium
375/219375 pulse or digital communications/(219) transceivers
375/220375 pulse or digital communications/(219) transceivers (220) transmission interface between two stations or terminals
375/221375 pulse or digital communications/(219) transceivers (221) loopback mode
375/222375 pulse or digital communications/(219) transceivers (222) modems (data sets)
375/223375 pulse or digital communications/(219) transceivers (222) modems (data sets) (223) angle modulation
375/224375 pulse or digital communications/(224) testing
375/225375 pulse or digital communications/(224) testing (225) data rate
375/226375 pulse or digital communications/(224) testing (226) phase error or phase jitter
375/227375 pulse or digital communications/(224) testing (227) signal noise
375/228375 pulse or digital communications/(224) testing (228) with indicator
375/229375 pulse or digital communications/(229) equalizers
375/230375 pulse or digital communications/(229) equalizers (230) automatic
375/231375 pulse or digital communications/(229) equalizers (230) automatic (231) training period or initial set up
375/232375 pulse or digital communications/(229) equalizers (230) automatic (232) adaptive
375/233375 pulse or digital communications/(229) equalizers (230) automatic (232) adaptive (233) decision feedback equalizer
375/234375 pulse or digital communications/(229) equalizers (230) automatic (232) adaptive (234) fractionally spaced equalizer
375/235375 pulse or digital communications/(229) equalizers (230) automatic (232) adaptive (235) quadrature channels
375/236375 pulse or digital communications/(229) equalizers (230) automatic (232) adaptive (236) accumulator or up/down counter
375/237375 pulse or digital communications/(237) pulse number modulation
375/238375 pulse or digital communications/(238) pulse width modulation
375/239375 pulse or digital communications/(239) pulse position, frequency, or spacing modulation
375/240375 pulse or digital communications/(240) bandwidth reduction or expansion
375/240.01375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal
375/240.02375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.02) adaptive
375/240.03375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.02) adaptive (240.03) quantization
375/240.04375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.02) adaptive (240.03) quantization (240.04) feed forward
375/240.05375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.02) adaptive (240.03) quantization (240.05) feed back
375/240.06375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.02) adaptive (240.06) feed forward
375/240.07375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.02) adaptive (240.07) feed back
375/240.08375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.08) feature based
375/240.09375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.08) feature based (240.09) polygonal approximation
375/240.1375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.08) feature based (240.1) separate coders
375/240.11375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.08) feature based (240.1) separate coders (240.11) subband coding
375/240.12375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.12) predictive
375/240.13375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.12) predictive (240.13) intra/inter selection
375/240.14375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.12) predictive (240.14) plural
375/240.15375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.12) predictive (240.15) bidirectional
375/240.16375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.12) predictive (240.16) motion vector
375/240.17375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.12) predictive (240.16) motion vector (240.17) half-pixel refinement
375/240.18375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.18) transform
375/240.19375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.18) transform (240.19) wavelet
375/240.2375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.18) transform (240.2) discrete cosine
375/240.21375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.21) subsampling
375/240.22375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.22) vector quantization
375/240.23375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.23) variable length coding
375/240.24375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.24) block coding
375/240.25375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.25) specific decompression process
375/240.26375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.26) associated signal processing
375/240.27375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.26) associated signal processing (240.27) error detection or correction
375/240.28375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.26) associated signal processing (240.28) synchronization
375/240.29375 pulse or digital communications/(240) bandwidth reduction or expansion (240.01) television or motion video signal (240.26) associated signal processing (240.29) pre/post filtering
375/241375 pulse or digital communications/(240) bandwidth reduction or expansion (241) pulse code modulation
375/242375 pulse or digital communications/(242) pulse code modulation
375/243375 pulse or digital communications/(242) pulse code modulation (243) correcting or reducing quantizing errors
375/244375 pulse or digital communications/(242) pulse code modulation (244) differential
375/245375 pulse or digital communications/(242) pulse code modulation (244) differential (245) quantizer or inverse quantizer
375/246375 pulse or digital communications/(242) pulse code modulation (244) differential (246) length coding
375/247375 pulse or digital communications/(242) pulse code modulation (244) differential (247) single bit (delta)
375/248375 pulse or digital communications/(242) pulse code modulation (244) differential (247) single bit (delta) (248) nonamplitude delta (area, etc.)
375/249375 pulse or digital communications/(242) pulse code modulation (244) differential (247) single bit (delta) (249) compand (overload prevention)
375/250375 pulse or digital communications/(242) pulse code modulation (244) differential (247) single bit (delta) (249) compand (overload prevention) (250) redundancy removal
375/251375 pulse or digital communications/(242) pulse code modulation (244) differential (247) single bit (delta) (249) compand (overload prevention) (251) syllabic
375/252375 pulse or digital communications/(242) pulse code modulation (244) differential (247) single bit (delta) (252) plural feedback loops
375/253375 pulse or digital communications/(242) pulse code modulation (253) length coding
375/254375 pulse or digital communications/(242) pulse code modulation (254) noise or distortion reduction
375/256375 pulse or digital communications/(256) pulse transmission via radiated baseband
375/257375 pulse or digital communications/(257) cable systems and components
375/258375 pulse or digital communications/(257) cable systems and components (258) transformer coupling
375/259375 pulse or digital communications/(259) systems using alternating or pulsating current
375/260375 pulse or digital communications/(259) systems using alternating or pulsating current (260) plural channels for transmission of a single pulse train
375/261375 pulse or digital communications/(259) systems using alternating or pulsating current (260) plural channels for transmission of a single pulse train (261) quadrature amplitude modulation
375/262375 pulse or digital communications/(259) systems using alternating or pulsating current (260) plural channels for transmission of a single pulse train (261) quadrature amplitude modulation (262) maximum likelihood decoder or viterbi decoder
375/263375 pulse or digital communications/(259) systems using alternating or pulsating current (260) plural channels for transmission of a single pulse train (261) quadrature amplitude modulation (263) partial response
375/264375 pulse or digital communications/(259) systems using alternating or pulsating current (260) plural channels for transmission of a single pulse train (261) quadrature amplitude modulation (264) multilevel
375/265375 pulse or digital communications/(259) systems using alternating or pulsating current (260) plural channels for transmission of a single pulse train (261) quadrature amplitude modulation (265) trellis encoder or trellis decoder
375/267375 pulse or digital communications/(259) systems using alternating or pulsating current (260) plural channels for transmission of a single pulse train (267) diversity
375/268375 pulse or digital communications/(259) systems using alternating or pulsating current (268) amplitude modulation
375/269375 pulse or digital communications/(259) systems using alternating or pulsating current (268) amplitude modulation (269) with phase or frequency shift keying
375/270375 pulse or digital communications/(259) systems using alternating or pulsating current (268) amplitude modulation (270) vestigial or single sideband or suppressed carrier
375/271375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation
375/272375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (272) frequency shift keying
375/273375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (272) frequency shift keying (273) combined with phase shift keying
375/274375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (272) frequency shift keying (274) minimum shift keying
375/275375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (272) frequency shift keying (275) more than two frequencies
375/276375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (272) frequency shift keying (276) one cycle or less per bit
375/277375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (272) frequency shift keying (277) vestigial or single sideband, or suppressed carrier
375/278375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (272) frequency shift keying (278) antinoise or distortion
375/279375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (279) phase shift keying
375/280375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (279) phase shift keying (280) more than two phases
375/281375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (279) phase shift keying (280) more than two phases (281) quaternary
375/282375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (279) phase shift keying (282) biphase (manchester codes)
375/283375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (279) phase shift keying (283) differential phase shift keying (diphase)
375/284375 pulse or digital communications/(259) systems using alternating or pulsating current (271) angle modulation (279) phase shift keying (284) antinoise or distortion
375/285375 pulse or digital communications/(259) systems using alternating or pulsating current (285) antinoise or distortion
375/286375 pulse or digital communications/(286) multilevel
375/287375 pulse or digital communications/(286) multilevel (287) with threshold level
375/288375 pulse or digital communications/(286) multilevel (288) transmission line
375/289375 pulse or digital communications/(286) multilevel (289) bipolar signal
375/290375 pulse or digital communications/(286) multilevel (290) partial response
375/291375 pulse or digital communications/(286) multilevel (290) partial response (291) duobinary
375/292375 pulse or digital communications/(286) multilevel (292) disparity reduction
375/293375 pulse or digital communications/(286) multilevel (293) synchronized
375/294375 pulse or digital communications/(286) multilevel (293) synchronized (294) phase locked loop
375/295375 pulse or digital communications/(295) transmitters
375/296375 pulse or digital communications/(295) transmitters (296) antinoise or distortion (includes predistortion)
375/297375 pulse or digital communications/(295) transmitters (296) antinoise or distortion (includes predistortion) (297) power amplifier
375/298375 pulse or digital communications/(295) transmitters (298) quadrature amplitude modulation
375/299375 pulse or digital communications/(295) transmitters (299) plural diversity
375/300375 pulse or digital communications/(295) transmitters (300) amplitude modulation
375/301375 pulse or digital communications/(295) transmitters (300) amplitude modulation (301) single or vestigial sideband or suppressed carrier
375/302375 pulse or digital communications/(295) transmitters (302) angle modulation
375/303375 pulse or digital communications/(295) transmitters (302) angle modulation (303) frequency shift keying
375/304375 pulse or digital communications/(295) transmitters (302) angle modulation (303) frequency shift keying (304) antenna tuning with frequency shift
375/305375 pulse or digital communications/(295) transmitters (302) angle modulation (303) frequency shift keying (305) minimum shift keying
375/306375 pulse or digital communications/(295) transmitters (302) angle modulation (303) frequency shift keying (306) one oscillator
375/307375 pulse or digital communications/(295) transmitters (302) angle modulation (303) frequency shift keying (307) two or more oscillators
375/308375 pulse or digital communications/(295) transmitters (302) angle modulation (308) phase shift keying
375/309375 pulse or digital communications/(295) transmitters (309) keying circuits
375/310375 pulse or digital communications/(295) transmitters (309) keying circuits (310) remote controlled
375/311375 pulse or digital communications/(295) transmitters (309) keying circuits (311) automatic
375/312375 pulse or digital communications/(295) transmitters (309) keying circuits (312) power or bias voltage supply keying
375/313375 pulse or digital communications/(295) transmitters (309) keying circuits (313) key shock or click prevention
375/314375 pulse or digital communications/(295) transmitters (309) keying circuits (314) including auxiliary control tube
375/315375 pulse or digital communications/(295) transmitters (309) keying circuits (315) modulation by absorption of signal, changing antenna dimension or changing antenna impedance
375/316375 pulse or digital communications/(316) receivers
375/317375 pulse or digital communications/(316) receivers (317) automatic baseline or threshold adjustment
375/318375 pulse or digital communications/(316) receivers (317) automatic baseline or threshold adjustment (318) differential amplifier
375/319375 pulse or digital communications/(316) receivers (317) automatic baseline or threshold adjustment (319) automatic bias circuit for dc restoration
375/320375 pulse or digital communications/(316) receivers (320) amplitude modulation
375/321375 pulse or digital communications/(316) receivers (320) amplitude modulation (321) single or vestigial sideband or suppressed carrier
375/322375 pulse or digital communications/(316) receivers (322) angle modulation
375/323375 pulse or digital communications/(316) receivers (322) angle modulation (323) combined phase shift keyed and frequency shift keyed
375/324375 pulse or digital communications/(316) receivers (322) angle modulation (324) particular demodulator
375/325375 pulse or digital communications/(316) receivers (322) angle modulation (324) particular demodulator (325) including coherent detector
375/326375 pulse or digital communications/(316) receivers (322) angle modulation (324) particular demodulator (326) carrier recovery circuit or carrier tracking
375/327375 pulse or digital communications/(316) receivers (322) angle modulation (324) particular demodulator (327) phase locked loop
375/328375 pulse or digital communications/(316) receivers (322) angle modulation (324) particular demodulator (328) including switching or gating (digital circuits)
375/329375 pulse or digital communications/(316) receivers (322) angle modulation (329) phase shift keying
375/330375 pulse or digital communications/(316) receivers (322) angle modulation (329) phase shift keying (330) differential (diphase)
375/331375 pulse or digital communications/(316) receivers (322) angle modulation (329) phase shift keying (330) differential (diphase) (331) more than two phases
375/332375 pulse or digital communications/(316) receivers (322) angle modulation (329) phase shift keying (332) plural phase (>2)
375/333375 pulse or digital communications/(316) receivers (322) angle modulation (329) phase shift keying (333) biphase (manchester code)
375/334375 pulse or digital communications/(316) receivers (322) angle modulation (334) frequency shift keying
375/335375 pulse or digital communications/(316) receivers (322) angle modulation (334) frequency shift keying (335) more than two frequencies
375/336375 pulse or digital communications/(316) receivers (322) angle modulation (334) frequency shift keying (336) minimum shift keying
375/337375 pulse or digital communications/(316) receivers (322) angle modulation (334) frequency shift keying (337) separate mark and space channels
375/338375 pulse or digital communications/(316) receivers (338) interrupted carrier wave
375/339375 pulse or digital communications/(316) receivers (338) interrupted carrier wave (339) carrier controlling local generator
375/340375 pulse or digital communications/(316) receivers (340) particular pulse demodulator or detector
375/341375 pulse or digital communications/(316) receivers (340) particular pulse demodulator or detector (341) maximum likelihood decoder or viterbi decoder
375/342375 pulse or digital communications/(316) receivers (340) particular pulse demodulator or detector (342) locating predetermined portion of pulse
375/343375 pulse or digital communications/(316) receivers (340) particular pulse demodulator or detector (343) correlative or matched filter
375/344375 pulse or digital communications/(316) receivers (344) automatic frequency control
375/345375 pulse or digital communications/(316) receivers (345) automatic gain control
375/346375 pulse or digital communications/(316) receivers (346) interference or noise reduction
375/347375 pulse or digital communications/(316) receivers (346) interference or noise reduction (347) diversity (frequency or time)
375/348375 pulse or digital communications/(316) receivers (346) interference or noise reduction (348) intersymbol interference
375/349375 pulse or digital communications/(316) receivers (346) interference or noise reduction (349) plural signal paths in receiver
375/350375 pulse or digital communications/(316) receivers (346) interference or noise reduction (350) by filtering (e.g., digital)
375/351375 pulse or digital communications/(316) receivers (346) interference or noise reduction (351) gating, blanking, etc.
375/352375 pulse or digital communications/(316) receivers (352) with electromagnetic relay or solenoid
375/353375 pulse or digital communications/(353) pulse amplitude modulation
375/354375 pulse or digital communications/(354) synchronizers
375/355375 pulse or digital communications/(354) synchronizers (355) synchronizing the sampling time of digital data
375/356375 pulse or digital communications/(354) synchronizers (356) network synchronizing more than two stations
375/357375 pulse or digital communications/(354) synchronizers (357) synchronization failure prevention
375/358375 pulse or digital communications/(354) synchronizers (358) feedback, receiver to transmitter
375/359375 pulse or digital communications/(354) synchronizers (359) self-synchronizing signal (self-clocking codes, etc.)
375/360375 pulse or digital communications/(354) synchronizers (359) self-synchronizing signal (self-clocking codes, etc.) (360) with transition detector
375/361375 pulse or digital communications/(354) synchronizers (359) self-synchronizing signal (self-clocking codes, etc.) (361) manchester code or biphase code
375/362375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal
375/363375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (363) synchronization bit insertion into artificially created gaps
375/364375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (364) synchronization signals with unique amplitude, polarity, length, or frequency
375/365375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (365) synchronization word
375/366375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (365) synchronization word (366) plurality of synchronization words
375/367375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (365) synchronization word (367) pseudo noise
375/368375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (365) synchronization word (368) synchronizer pattern recognizers
375/369375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (369) start - stop
375/370375 pulse or digital communications/(354) synchronizers (362) frequency or phase control using synchronizing signal (369) start - stop (370) with asynchronous data
375/371375 pulse or digital communications/(354) synchronizers (371) phase displacement, slip or jitter correction
375/372375 pulse or digital communications/(354) synchronizers (371) phase displacement, slip or jitter correction (372) elastic buffer
375/373375 pulse or digital communications/(354) synchronizers (371) phase displacement, slip or jitter correction (373) phase locking
375/374375 pulse or digital communications/(354) synchronizers (371) phase displacement, slip or jitter correction (373) phase locking (374) with charge pump or up and down counters
375/375375 pulse or digital communications/(354) synchronizers (371) phase displacement, slip or jitter correction (373) phase locking (375) with frequency detector and phase detector
375/376375 pulse or digital communications/(354) synchronizers (371) phase displacement, slip or jitter correction (373) phase locking (376) phase locked loop
375/377375 pulse or digital communications/(377) miscellaneous

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