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8098830 |
Method and apparatus for reducing noise in an audio signal
A technique for reducing inherent noise in a real time digital audio wireless system. The technique allows for low power stereo analog to digital and digital to analog converters to be used in a...
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8050412 |
Scaling adjustment to enhance stereo separation
A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal...
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8045717 |
Stereo decoder and method for processing pilot signal
A stereo decoder and a method therefor are provided. The stereo decoder receives a MPX signal from an FM demodulator, and comprises a first auto-calibration circuit, a band-pass filter, a second...
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7966147 |
Generating images according to points of intersection for integer multiples of a sample-time distance
According to one embodiment, generating images according to intersection points includes obtaining samples of signals from transmitter-receiver pairs. A transmitter-receiver pair is configured to...
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7961890 |
Multi-channel hierarchical audio coding with compact side information
A parametric representation of a multi-channel audio signal describes the spatial properties of the audio signal well with compact side information when a coherence information, describing the...
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7894609 |
Stereo signal processing apparatus
Disclosed is a stereo signal processing apparatus, in particular for a digital BTSC television decoder, comprising a sub-channel signal processing section which comprises an input for inputting an...
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7787630 |
FM stereo decoder incorporating Costas loop pilot to stereo component phase correction
A novel system and method for correcting the residual phase offset between a recovered pilot signal and the received stereo signal. The invention uses a Costas loop as an auxiliary loop in addition...
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7715566 |
Apparatus and method of automatically compensating a difference between audio signals of an analog broadcast and a digital broadcast
An apparatus and a method of automatically compensating a difference between audio signals of an analog broadcast and a digital broadcast depending on a difference of a modulation degree of an...
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7667553 |
Frequency modulator using PLL
In a frequency modulator, a VCO oscillates at a frequency according to a voltage applied to an input terminal. A divider divides an output signal of the VCO. A phase comparator compares the output...
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7437299 |
Coding of stereo signals
A method of encoding a multichannel signal, such as a stereophonic audio signal, including at least first and second signal components includes transforming at least the first and second signal...
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7149312 |
Method and device to retrieve RDS information
To retrieve RDS information by filtering and transforming an incoming multiplex signal (m(t)) into a RDS baseband signal, an amplitude modulated RDS signal (ma(t), mc(t)) is derived on basis of an...
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6954534 |
Multiple signal carrier transmission apparatus and method
A multiple signal carrier transmission apparatus and method for broadcasting stereo sounds to an audio output device uses three related carrier frequencies on which are modulated the sum of first...
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6570500 |
Infra-sound surveillance system
The invention is a method for monitoring an environment by evaluating an infrasonic signal obtained from said environment. The method includes averaging said infrasonic signal (Vinfra) to provide...
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6544122 |
Background-sound control system for a video game apparatus
A background-sound control apparatus, a background-sound control method, readable recording medium containing a background-sound control program, and a video game apparatus improve effectiveness of...
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6272226 |
Apparatus and method for masking audio signals in a signal distribution system
An apparatus and method is provided for transmitting "masked" stereo audio signals in a signal distribution network such as a cable television system within the bandwidth constraints of...
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5915028 |
Amplitude demodulator
An amplitude demodulator for demodulating a quadrature-amplitude modulated stereo signal for radio receivers, where a digital intermediate-frequency signal is constructed from a received signal,...
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5815532 |
Method and apparatus for peak-to-average ratio control in an amplitude modulation paging transmitter
A method and apparatus for reducing peak-to-average power ratio in a paging transmitter broadcasting an independent sideband amplitude modulation protocol is disclosed. A digital signal, for...
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5668923 |
Voice messaging system and method making efficient use of orthogonal modulation components
A modulation scheme (600) useful in a voice paging system in which both of two orthogonal modulation components (500 and 510) are used to carry two halves of a single voice message destined for a...
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5610579 |
Apparatus and method for selecting a control source for an electrical switching device
A controller for an electrical switching device such as a motor starting contactor including separable contacts, an operating mechanism for operating the separable contacts and a control mechanism...
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5561716 |
Demodulator
In a demodulator for a stereo signal transmitted by amplitude and phase modulation of a carrier, a phase signal and a quantity signal are formed. By multiplication of the quantity signal with the...
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5343534 |
Sequential audio switcher
A two channel audio switcher includes two analog switches, which may be implemented as a CMOS integrated circuit, receiving at their control input ports a complementary pair of drive signals,...
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4955072 |
Method of generating an amplitude-modulated ISB transmission signal and apparatus for carrying out the method
In the case of a method for the generation of an amplitude-modulated ISB transmission signal from different AF signal (NF1,2), the signal vectors are split into signal components (x1,y1 and x2,y2,...
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4850020 |
Asymmetrical sideband AM stereo transmission
Asymmetrical sideband amplitude modulation (AM) stereo transmission apparatus which transmits left (L) plus right (R) stereo information (L+R) in one stereo channel and a signal including L-R...
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4769842 |
Asymmetrical sideband transmission with pseudo-stereo effects
An improved asymmetrical sideband amplitude modulation (AM) transmitter is provided wherein the resulting transmitted signal produces a pleasing pseudo-stereo effect when received by a stereo...
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4716590 |
AM stereo transmission method and apparatus
This invention discloses an AM stereo transmission method characterized in that when left and right audio signals L and R are transmitted as an AM stereo signal which is represented by S=A...
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4688255 |
Compatible AM broadcast/data transmisison system
A system for transmitting a composite signal comprising a data transmission signal component and an AM broadcast signal component. The broadcast signal component may be monophonic or stereophonic....
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4680794 |
AM stereo system with modified spectrum
The correction signal of the AM stereo system is filtered through a lowpass filter thus providing compatible signals at all normal modulation levels and frequencies, but allowing the signal to...
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4679238 |
Method and system for signalling additional information by AM medium wave broadcasting
To permit transmission of traffic information by amplitude modulation in the medium wave band without disturbing audio signals being broadcast, a stereo pilot tone of frequency fpt below audible...
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4679239 |
Apparatus and method for processing stereo signals for application to an AM stereo broadcasting unit
In a system for processing stereo signals prior to application to an AM stereo channel information, the signals prior to broadcasting left channel and right channel automatic gain controllers are...
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4638503 |
Fully compatible AM stereophonic transmitting system
A stereophonic transmitting system is disclosed for transmitting in quadrature a single carrier signal carrying first and second signals. The transmitting system comprises a phase shifter or...
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4638504 |
Independent channel modulation system for AM stereo
An apparatus for modulating signals for use in AM stereo transmission having left and right signal inputs feeding respective inverted and non-inverted inphase modulators and respective inverted and...
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4593402 |
AM stereo transmitter
An AM stereo transmitter with bandwidth limiting utilizes the detection of high frequency energy in the modulating signal to control the difference channel input to the stereo encoder.
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4589127 |
Independent sideband AM multiphonic system
An improved transmitter for a compatible independent sideband (ISB) AM stereo system develops a phase modulated carrier where the modulation represents the stereo difference signal inverse...
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4569073 |
Asymmetrical sideband transmission
An amplitude modulated radio transmission system is described which is compatible with conventional AM receivers. The transmitted signal comprises a carrier and two unequal amplitude sidebands....
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4520498 |
AM Stereo modulator
An AM stereo modulator is disclosed which includes a limiter responsive to first and second audio signals for providing first and second equally limited amplitude limited signals. A quadrature...
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4510614 |
Predistorted AM stereo transmission
A method for generating a compatible AM quadrature stereo wave by delivering a modulated carrier with in-phase sidebands generated by a first combination of two signals, and quadrature sidebands...
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4489411 |
Process and a circuit arrangement for signal transmission using an amplitude-modulated radio broadcasting system
For the simplified text or picture data signal transmission through a broadcasting system, an additional phase and/or frequency modulation is produced in amplitude modulated transmitters. In a...
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4486898 |
Amplitude limiter for AM broadcast transmitter
An amplitude limiter for an AM broadcast transmitter to minimize energy in the broadcasted signal outside an allocated broadcast bandwidth. The secondary and higher order spectra (i.e. second and...
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4477924 |
AM Stereo detector
The method and apparatus for providing an AM stereo receiver suitable for receiving an AM/PM modulated RF carrier frequency, the receiver uses a standard AM detector to receive said AM/PM modulated...
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4475244 |
Time-period modulation transmission system
A system for time-period modulating (TPM) a subcarrier in accordance with the amplitude of an input signal includes generating a ramp signal of constant slope, comparing the ramp signal with the...
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4472831 |
AM Stereophonic transmitter
An AM stereophonic signal transmitter includes a matrix circuit which generates a sum signal corresponding to the sum of left and right channel stereophonic signals and a difference signal...
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4458361 |
AM Stereo Broadcasting system
An AM stereo broadcasting system for transmitting stereo signals in the AM broadcasting band. The system is based on amplitude modulation by two carriers having the same frequency and a 90° phase ...
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4451927 |
Separation correction method and apparatus for plural channel transmission system
Apparatus is disclosed for use in improving the separation between the individual channels of a plural channel communication system such as a stereo AM radio broadcasting system. The separation...
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4373115 |
Predictive distortion reduction in AM stereo transmitters
An apparatus for generating a composite AM stereo broadcast signal wherein a carrier is angle modulated with stereo difference information contained in a first supplied signal and the...
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4338491 |
Compatible AM stereophonic system
The signal as transmitted is a compatible AM stereophonic signal with amplitude directly proportional to the monophonic signal 1+L+R. The instantaneous phase angle is the quadrature phase angle...
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4332978 |
Low frequency AM stereophonic broadcast and receiving apparatus
Apparatus is described for transmitting and receiving stereophonic broadcasts in the low frequency commercial AM broadcast band. A transmitter is described which modulates the phase and amplitude...
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4324952 |
Direct function receivers and transmitters for multichannel communications system
Transmitters and receivers are disclosed for communicating composite modulated signals including at least two modulated components. The transmitters include phase and envelope operators (54, 56)...
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4323731 |
Variable-angle, multiple channel amplitude modulation system
A compatible AM stereo system employing a modified quadrature modulation scheme where the gain in the quadrature-phased channel, and thus the phase angle between the L and R modulated phase...
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4236042 |
Compatible AM stereo system employing a modified quadrature modulation scheme
A compatible AM stereo system including a modified quadrature modulation scheme. Two stereo modulators are described which each generate composite modulated signals including a carrier component...
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4220818 |
AM Stereo transmitter
A transmitter for an independent sideband (ISB) AM stereo system is provided with a phase modulator which includes means for generating second order upper and lower sidebands which are proportional...
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