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| Number | Title | Issue Date |
| 7822214 | Audio power output system with shared output blocking capacitor An audio power output system with shared output blocking capacitor provides reduced cost and volume in multi-channel audio power output systems. A pair of transducers are series-connected in opposite polarity and a common DC blocking capacitor provides the return pa... | 10/26/2010 |
| 7409066 | Method of adjusting filter parameters and an associated playback system To improve upon a method of adjusting at least one filter parameter such as the mid-frequency of at least one filter unit provided with a playback system for audio signals, this filter unit being provided in particular for at least one digital equalizer assigned to ... | 08/05/2008 |
| 7406144 | Clock generator circuit using phase modulation technology and method thereof A clock generator circuit, comprising: a multi-phase clock signal generator for generating a plurality of clock signals having a same frequency but difference phases according to a reference clock signal; a modulation device for generating a phase modulation signal ... | 07/29/2008 |
| 7366909 | Dynamic wavelet feature-based watermark A dynamic wavelet feature-based watermark for use with digital video. Scene change detection separates digital data into one or more scenes, wherein each of the scenes is comprised of one or more frames. A temporal wavelet transformation decomposes the frames of eac... | 04/29/2008 |
| 7319775 | Wavelet domain watermarks A wavelet domain watermark encoder and decoder embed and detect auxiliary signals in a media signal, such as a still image, video or audio signal. A watermark orientation signal is embedded in a wavelet decomposed signal to facilitate detection of the watermark in a... | 01/15/2008 |
| 7313824 | Method for protecting digital content from unauthorized use by automatically and dynamically integrating a content-protection agent A content processor application is loaded into memory from a master image to form a runtime content processor application image. An integration agent dynamically integrates a protection agent into the loaded runtime content processor application image to form a cust... | 12/25/2007 |
| 7286675 | Audio signal processors An audio signal processor includes a tone control (23). The tone control comprises two low-pass filters (221, 222) operating in current-mode and a subtractor (223) which subtracts the output currents of the filters to produce a band-pass charact... | 10/23/2007 |
| 7280669 | Digital image watermarking apparatus and method The present invention relates to a digital image watermarking apparatus and method. Luminance component of a digital image are transformed into coefficients of a frequency domain, and watermark is generated by encrypting a user key and generating pseudo random numbe... | 10/09/2007 |
| 7215165 | Clock generating circuit and clock generating method The invention provides a clock generating circuit for generating a spectrum spread clock and carrying out high-speed and accurate phase control of a reference clock signal and an output clock signal, which is composed of compact circuits, and a method for generating... | 05/08/2007 |
| 7206419 | Guitar preamlifier system with controllable distortion A musical instrument preamplifier system is provided which comprises a filtering means for splitting an input signal into two or more separate frequency bands comprising a similar phase response for each frequency band, two or more non-linear circuits, each of which... | 04/17/2007 |
| 7085389 | Infinite slope loudspeaker crossover filter An improvement to inventor's prior art loudspeaker crossover filter invention is described. A substantially flat network input-impedance characteristic across the audible frequency range is provided by the addition of at least one series connected constant resistanc... | 08/01/2006 |
| 7058430 | Mobile communications terminal with a hands-free mode A mobile communications terminal is provided having a first loudspeaker for emitting sound signals in a normal mode of the communications terminal, a second loudspeaker for emitting sound signals in a hands-free mode of the communications terminal, an antenna and a ... | 06/06/2006 |
| 6975733 | Watermarking of digital images using wavelet and discrete cosine transforms The present invention relates to a method for embedding a watermark into a black and white or color digital image [D(x)]. Basically the inventive method comprises the steps of transforming the digital image using a wavelet transform [WC(y)], transforming a watermark... | 12/13/2005 |
| 6931135 | Frequency dependent excursion limiter A circuit and method provides for the protection of transducers from over excursion, particularly for the protection of transducers for audio loudspeakers. A frequency dependent excursion limiter circuit has an initial summing stage followed by a shaping filter stag... | 08/16/2005 |
| 6925186 | Ambient sound audio system The three dimensional audio system may have an audio terminal and a computer input terminal in communication with multiple routing relays. The routing relays may be in communication with a volume calibration control that may be in communication with a volume control... | 08/02/2005 |
| 6707919 | Driver control circuit A driver control circuit (10) that enhances a steep crossover slope while permitting selective shaping or adjusting of its in-band frequency response with a minimum number of components. The driver control circuit includes a signal connector (16) for c... | 03/16/2004 |
| 6665408 | Dynamic bass control circuit with variable cut-off frequency A circuit for providing a variable amount of bass control on an input signal dependent on a signal level of the input signal includes a high-pass filter, a variable impedance shunt connected to the output of the high-pass filter, and a signal level detect... | 12/16/2003 |
| 6411717 | Switched capacitor filter with a neutral bypass setting An SC filter with intrinsic anti-alias function for adjustably decreasing or increasing the amplitude of audio signals in a predetermined frequency range. The SC filter includes a filter module having an RC network with at least one frequency-response-det... | 06/25/2002 |
| 6396934 | Analog audio filter for high frequencies The present invention relates to an active analog filter including a differential amplifier, an output of which provides a filtered signal and a non-inverting input of which is connected to a median potential between supply potentials of the amplifier, a ... | 05/28/2002 |
| 6310959 | Tuned order crossover network for electro-acoustic loudspeakers A crossover network for partitioning by frequency and electrical audio signal from an amplifier into a plurality of frequency bands for presentation to respective drivers or transducers. Such a crossover network couples the respective transducers in a par... | 10/30/2001 |
| 6201873 | Loudspeaker-dependent audio compression The invention is an audio compression system for reducing distortion arising primarily from excessive loudspeaker excursion. For a given input audio signal, the maximum signal magnitude (or envelope, energy or power) level above which the loudspeaker will... | 03/13/2001 |
| 5737432 | Split-band clipper A split-band clipper which generates less distortion, minimizes or reduces the occurrence of all IMD, or at least will minimize and reduce the occurrence of widely space IMD, and reduce the quantity of harmonic distortion caused by clipping of bass freque... | 04/07/1998 |
| 5675656 | Power amplifier with clipping level control In a power amplifier, a control device employing a dual ganged potentiometer is connected in the feedback circuits of successive amplifier stages to increase the gain of the front end stage while simultaneously reducing the gain in a subsequent stage when... | 10/07/1997 |
| 5533135 | Crossover system An audio crossover system having two crossover networks, one suited to the auditory preferences of women and the other to the auditory preferences of men. The former attenuates mid-range frequencies more than high-range frequencies and attenuates low-rang... | 07/02/1996 |
| 5495527 | Telephone privacy device A telephone privacy device includes first and second connectors that are mateable with a telephone handset and a telephone base, respectively. The handset includes a microphone, and the device includes a variable amplifier that allows the user to amplify ... | 02/27/1996 |
| 5384855 | Audio system for vehicular application Electronic crossover audio systems and methods in accordance with the invention provide flat frequency response and the feeling of three-dimensional music reproduction with a well defined image of the placement of various instruments, the vocal source acr... | 01/24/1995 |
| 5361381 | Dynamic equalizing of powered loudspeaker systems A powered loudspeaker system has a cabinet. The cabinet has at least one electroacoustical transducer and a power amplifier coupled to the electroacoustical transducer. Dynamic equalization circuitry coupled to the power amplifier provides a predetermined... | 11/01/1994 |
| 5349301 | Multiple amplifier system for a car A multiple amplifier system comprises a sound source, a power source, an electronic crossover network for dividing an audio signal from the sound source into a plurality of frequency ranges. Each of the divided audio signal is amplified by an individual p... | 09/20/1994 |
| 5325435 | Sound field offset device A sound field offset device having two channels, each of which includes a frequency selection filter for dividing a stereophonic input signal into two frequency bands by a given frequency falling within an audio frequency, at least one digital filter for ... | 06/28/1994 |
| 5245278 | Device for the processing of a signal coming from a sensor with a derivative type of response The disclosure relates to devices for the measurement of signals in the field of wideband phenomena. More precisely, a device is disclosed for the processing of electrical signals coming from a derivative type of sensor designed to measure an electrical o... | 09/14/1993 |
| 5237619 | Sound mixer with band separation In a mixer there is a plurality of preamplifiers followed by a plurality of tone control groups connected to a plurality of voltage followers to which a series of active filters is connected, for selecting frequency bands of signals. Then a plurality of a... | 08/17/1993 |
| 5168526 | Distortion-cancellation circuit for audio peak limiting Apparatus for reducing distortion in a peak limited audio siganl. The amount of low-frequency spectral energy in the input audio signal is determined for a peak limited signal and used to control low-frequencies in the output audio signal. Identical low-p... | 12/01/1992 |
| 5146506 | Isolator circuit for an audio system An isolator circuit for an audio system has an operational amplifier provided between a signal source and an amplifier. A capacitor and a resistor connected in series are connected between each input of the operational amplifier and the signal source. A b... | 09/08/1992 |
| 5129006 | Electronic audio signal amplifier and loudspeaker system An electronic audio signal amplifier and loudspeaker system comprises a preamplifier circuit, a plurality of L electronic crossover networks, a plurality of M output amplifiers and an associated plurality of M loudspeaker assemblies. The electronic crosso... | 07/07/1992 |
| 5129005 | Electrodynamic loudspeaker In a loudspeaker with a number of speaker units, each connected across one power amplifier to a diplexer, the power amplifiers having negative source impedance (-R1) are utilized. The diplexer includes an adder circuit and a filter connected th... | 07/07/1992 |
| 5111508 | Audio system for vehicular application An audio processing module (20) capable of virtually infinite segmentation of the audio frequency spectrum. The module (20) comprises a first submodule (22), a second submodule (24) and a subwoofer module (28). The first and second submodules (22, 24) are... | 05/05/1992 |
| 5004067 | Cinema sound system for unperforated screens A cinema sound system for unperforated screens includes for each stereophonic channel a floor positioned direct radiator bass speaker unit radiating into quarter space and an upper frequency speaker unit mounted above the screen. Each upper frequency spea... | 04/02/1991 |
| 4991221 | Active speaker system and components therefor A biamplified speaker system wherein each speaker enclosure contains amplifiers and an electronic crossover network is powered by its own power supply. A preamplified audio signal is fed to each speaker enclosure for reproduction by a tweeter and a pair o... | 02/05/1991 |
| 4905284 | Audio system for vehicular applications Electronic crossover modules and systems in accordance with the invention employ a set of crossover channels in each module together with internal input interconnections which enable input signals to be serially intercoupled but cutoff points to be separa... | 02/27/1990 |
| 4856065 | Power fader for a loudspeaker system In an adjustable power fader device for a loudspeaker system with at least four speakers right and left channel input signals are received by respective power fader circuits. Each power fader circuit has a variable resistor connected across its input term... | 08/08/1989 |
