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| Number | Title | Issue Date |
| 4457012 | FM Stereo apparatus and method An output matrix adapted to receive an L+R signal component (made up of the sum of L and R stereo components) and an L-R signal component, and to combine these in a manner to produce a separate L output and a separate R output, with certain modifications ... | 06/26/1984 |
| 4454607 | FM Stereophonic receiver with CPU controlled tuning and demodulating An FM stereophonic receiver is arranged so that a central processing unit assigned for selection of a broadcasting station is burdened, based on a clock pulse of the central processing unit, to generate sub-carriers synchronized with a pilot signal contai... | 06/12/1984 |
| 4426727 | FM Noise reducing circuit An FM noise reducing circuit which comprises an operational amplifier for comparing intermediate frequency signal levels and multipath signal levels, and a multiplexer controlled by output signals from the operational amplifier is arranged to carry out at... | 01/17/1984 |
| 4419541 | Pulsive noise removing apparatus A pulsive noise removing apparatus comprises a subtracting circuit (35) receiving one input thereto a stereo composite signal directly from a delay circuit (31). A stereo switching signal is generated as a function of a stereo pilot signal included in the... | 12/06/1983 |
| 4408098 | Receiver with field-strength dependent noise reduction control Receiver comprising a field-strength detector for measuring the received signal amplitude and a noise reduction circuit connected thereto via a control signal generating device for reducing audio-frequency noise in the output signal of the receiver, which... | 10/04/1983 |
| 4390749 | Noise control system for FM radio A noise control system for an FM stereo radio receiver is provided for controlling noise in the audio output, particularly in an area where the broadcast signal strength is relatively high. The system is designed for use with an FM stereo radio receiver h... | 06/28/1983 |
| 4379207 | Automatic noise eliminating device for an FM receiver In an FM receiver having cutoff circuits for cutting off higher frequency signal components of an audio signal, and for reducing stereo separation between channels, there is provided a multipath detector for detecting an amplitude modulated FM intermediat... | 04/05/1983 |
| 4356350 | FM Receiver Stereo composite signals and 38 KHz sub-carrier switching signal are fed to a stereo demodulator. The 38 KHz sub-carrier switching signal is generated from the phase-lock loop circuit and is transmitted to the stereo demodulator circuit via a gain-control... | 10/26/1982 |
| 4314377 | Noise removing apparatus A noise removing apparatus is interposed between an FM detecting circuit and a stereo demodulating circuit. The noise removing apparatus is responsive to a pulsive noise included in the output from the detecting circuit to enable a first gate to interrupt... | 02/02/1982 |
| 4306112 | Stereophonic receiver noise eliminating device A circuit for eliminating pulsating electrical noise in a received and detected signal. A phase-locked loop circuit produces an output signal whose frequency and phase are identical to those of the stereophonic demultiplexer pilot signal of the composite ... | 12/15/1981 |
| 4246441 | FM Receiver equipped with noise pulse supression device An FM receiver including a noise pulse detection circuit which receives an FM detected signal containing a pilot signal and produces a control signal when a noise pulse is detected. A gate is operable to interrupt the transmission of the FM detected signa... | 01/20/1981 |
| 4221928 | Noise reduction circuit for stereo signals Noise reduction circuit for stereo signals comprising a control input terminal, first and second outputs as well as a controllable coupling circuit for a controllable mutual signal coupling between the two outputs, the two outputs being decoupled from one... | 09/09/1980 |
| 4208547 | Method and apparatus for reducing noise in stereophonic signals A noise reducer for multi-channel stereophonic signals is characterized by separate processing channels having different characteristics for the main and composite signals with means to reconstitute the phase correspondence between the signality processed... | 06/17/1980 |
| 4207432 | Noise eliminating system A system for eliminating a noise from a stereo signal is disclosed comprising first and second signal paths to which an input stereo signal is applied simultaneously, storage means provided in the first signal path for storing an audio signal component, a... | 06/10/1980 |
| 4195203 | Noise cancelling system for FM receiver In a noise cancelling system for FM receivers, means is provided whereby a pilot signal of 19 KHz is always detected from a stereo composite signal, whether or not a noise canceller circuit is operated. The 19 KHz pilot signal is injected into a phase loc... | 03/25/1980 |
| 4194087 | Control circuit and FM stereo receiver using same Circuitry for generating from an input signal having leading and trailing edges at least two output control signals where the leading and trailing edges of the first one of the two output control signals respectively precede and follow the leading and tra... | 03/18/1980 |
| 4191851 | FM Noise suppressor An FM noise suppressor comprising a detector circuit which detects noise pulses included in a detected stereo composite signal, a gate circuit which is enabled or disabled by an output from the detector circuit, and a reproducing circuit which receives th... | 03/04/1980 |
| 4191850 | Interferences reduction for use in an FM radio receiver Information signals, 19 KHz stereo pilot signals and interference signals are received at an antenna and then applied to a low-pass filter and a high-pass filter. The interference signals derived from the high-pass filter control a gate which is disposed ... | 03/04/1980 |
| 4154980 | Noise blanker with variable rate-shut-off and/or variable blanking threshold level A noise blanker circuit for a stereo radio receiver is disclosed herein. The noise blanker circuit detects noise impulses in a received radio signal. When the magnitudes of these detected noise impulses exceed a predetermined threshold level corresponding... | 05/15/1979 |
| 4130805 | Noise clearing system A noise clearing system is described which comprises a means for applying a signal representing the existing period of an impulsive noise which is contained in an incoming signal, a means for detecting the impulsive noise, a means for reversing the phase ... | 12/19/1978 |
| 4087641 | Noise limiting circuit for FM stereo receiver A noise limiting circuit for an FM stereo receiver comprises a filter circuit 13 for grounding high frequency components in the detector output signal through a transistor switch 14 in response to a low field strength signal supplied by the IF amplifier. ... | 05/02/1978 |
| 4066845 | Pulsive noise removing apparatus for an FM receiver An apparatus for removing a pulsive noise in an FM stereo signal including a stereo information signal and a stereo pilot signal, said composite signal further including a pulsive noise, said apparatus comprising an FM detector for providing said composit... | 01/03/1978 |
| 4063039 | Stereo noise reduction circuit A stereo noise reduction circuit is disclosed having circuitry responsive to the automatic gain control voltage generated within an FM stereo receiver for reducing the noise associated with low levels of the RF carrier. A first portion of the noise reduct... | 12/13/1977 |
| 4037057 | Noise-cancelling apparatus for FM stereo receiver A noise-cancelling apparatus for use in an FM stereo receiver. This apparatus blends the signals of the left and the right channels of the receiver with each other substantially evenly throughout the entire audio frequency range of such signals so that no... | 07/19/1977 |
| 3943293 | Stereo sound reproducing apparatus with noise reduction To reduce the effects of noise in stereo audio apparatus, cross talk is introduced between the output channels in a frequency sensitive manner, the amount of cross talk being controlled in accordance with an input or output signal level on the level of tw... | 03/09/1976 |
