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| Number | Title | Issue Date |
| 7317800 | Apparatus and method for processing an audio signal to compensate for the frequency response of loudspeakers A circuit for processing an input audio signal received at an input of the circuit provides a processed audio signal at a circuit output. The circuit includes first and second conductive paths through which the received audio signal travels. The audio signal is proc... | 01/08/2008 |
| 7292655 | Apparatus and method and decoding biphase signals A technique of decoding a biphase signal comprises sampling the biphase signal to obtain phase sample values and sampling the biphase signal to obtain magnitude sample values. A first digital signal is derived from the phase sample values and associated bit combinat... | 11/06/2007 |
| 7251337 | Volume control in movie theaters A motion picture soundtrack reproduction system has a center front soundtrack channel and a plurality of other soundtrack channels. A volume control adjusts the gain of all the channels. The volume control has a range of settings from a minimum to a maximum, the gai... | 07/31/2007 |
| 7248702 | Sound enhancement system A system for enhancing sound quality comprising a filter that square roots the instantaneous amplitude of frequencies in an input signal for generating artificial harmonics corresponding to said frequencies. The system can comprise an automatic level control that mo... | 07/24/2007 |
| 7242779 | Methods and apparatus for sub-harmonic generation, stereo expansion and distortion Methods and apparatus are disclosed that achieve sub-harmonic signal processing, stereo-width expansion, sub-woofer signal processing, and tube distortion emulation to achieve various desirable acoustic effects when used to modify an input signal containing, for exa... | 07/10/2007 |
| 7170360 | Device and method for digital pulse width modulation The present invention provides a device for digital pulse width modulation with: (a) a filter device (11) for filtering a filter input signal (10″); (b) a quantization device (13) for quantizing a filter output signal (11′) of the fil... | 01/30/2007 |
| 7133531 | Device using analog controls to mix compressed digital audio data Device includes a disc jockey mixing console with analog controls, crossfader and scratchpad and is used to mix audio tracks from compressed digital audio data sound recordings. One device substitutes for mixing console, turntables and records. For compressed digita... | 11/07/2006 |
| 7130435 | Component selection control system The invention provides a component selection control system comprising signal output components 2 to 5, signal input components 4, 5, and an amplifier unit 1 having these components 2 to 5 connected thereto. The signal outpu... | 10/31/2006 |
| 7110555 | Sound signal reproducing apparatus A sound signal reproducing apparatus for supplying sound signals of a plurality of channels to speakers via sound amplifier circuits includes: a power supply voltage controller for controlling a power supply voltage to the sound amplifier circuits; a plurality of fi... | 09/19/2006 |
| 7095807 | Method for decoding biphase signals A technique of decoding erroneous biphase signals is disclosed comprising the following steps. First, phase and magnitude sample values (ps, bs) are formed, from which a first digital signal (d1) is derived. From this, associated bit combinations (St1,... | 08/22/2006 |
| 7088827 | Reconfigurable speaker system A reconfigurable speaker system for producing sound in response to at least one of right and left channel audio signals generated by an audio source. The speaker system can be configured by the user to simultaneously reproduce right and left channel audio informatio... | 08/08/2006 |
| 7085387 | Sound system and method for capturing and reproducing sounds originating from a plurality of sound sources A sound system for capturing and reproducing sounds produced by a plurality of sound sources. The system comprises a device for receiving sounds produced by the plurality of sound sources and converting the separately received sounds to a plurality of separate audio... | 08/01/2006 |
| 7031474 | Acoustic correction apparatus An acoustic correction apparatus processes a pair of left and right input signals to compensate for spatial distortion as a function of frequency when said input signals are reproduced through loudspeakers in a sound system. The sound-energy of the left and right in... | 04/18/2006 |
| 7010131 | Quasi-differential power amplifier and method A quasi-differential power amplifier and method are disclosed that enhance drive capability and dynamic range by driving a right, left and common terminals with a right channel output signal, a left channel output signal, and a common mode output signal that are eac... | 03/07/2006 |
| 6762641 | Voltage level translation circuits Voltage level translators are presented, inter alia, for operating an operational amplifier integrated circuit designed for operation with a single ended power supply, to operate with a split level power supply having a center tapped ground. A first polarity power s... | 07/13/2004 |
| 6529787 | Multimedia computer speaker system with bridge-coupled subwoofer A multimedia computer speaker system includes a pair of amplifiers that provide amplified right and left audio signals to a pair of wide-band speakers. The amplifiers are configured to provide the amplified right and left audio signals that are out of pha... | 03/04/2003 |
| 6448719 | Apparatus and method for pulsating lights in response to an audio signal An acoustical control apparatus for regulating voltage flow in response to an audio signal. The apparatus includes a power supply, a level control network, a multiple active filter network, a phase control network, a comparator network and output control ... | 09/10/2002 |
| 6421447 | Method of generating surround sound with channels processing separately A method of generating surround sound with channels processing separately includes steps of transmitting left and right channel signals separately to a first multiple frequency phase shift processor, a pre-set equalizer and a second multiple frequency pha... | 07/16/2002 |
| 6181796 | Method and system which drives left, right, and subwoofer transducers with multichannel amplifier having reduced power supply requirements A system and method which generates amplified signals indicative of left and right stereo channels, and uses the signals to drive transducers for each of subwoofer, left stereo, and right stereo channels. The amplification circuitry is operable with a pow... | 01/30/2001 |
| 6038324 | Automotive surround sound circuit background of the invention A surround sound converter for home audio systems includes outputs for a left front speaker, a right front speaker, a left rear speaker, a right rear speaker, and an auxiliary output to accommodate a rear auxiliary amplifier. The surround sound converter ... | 03/14/2000 |
| 6028945 | Interchangeable amplifier device An interchangeable amplifier device includes an amplifier cabinet. The amplifier cabinet has a bottom side, a top side and enclosing side walls for housing the amplifier electronics. The enclosing side walls have a front wall and a back wall. The front wa... | 02/22/2000 |
| 6026168 | Methods and apparatus for automatically synchronizing and regulating volume in audio component systems A signal regulator regulates an auxiliary signal based upon a primary signal scaled by an external amplifier. The signal regulator receives the primary signal with an unscaled level. Processing circuitry monitors the unscaled level of the primary signal. ... | 02/15/2000 |
| 6011852 | Audio power amplifier device for micro-computers A power amplifier device for amplifying an audio signal from sound generating circuitry in a micro-computer is provided. The device is retained in a housing secured in a drive bay of the micro-computer containing a disk drive such as a compact disc read o... | 01/04/2000 |
| 5970153 | Stereo spatial enhancement system A stereophonic signal processing system provides optimal spatial enhancement in a compact stereo sound system having limited physical separation between two relatively small stereo loudspeakers with accordingly limited low-frequency output capability. A d... | 10/19/1999 |
| 5920229 | Power amplifier apparatus In a power amplifier apparatus, a positive output signal of left front output amplifier (2LF), a negative output signal of left rear output amplifier (3LR), a negative output signal of right front output amplifier (3RF), and a positive output signal of ri... | 07/06/1999 |
| 5914636 | Balanced power audio amplification system A configuration of audio system components, utilizing standard amplifier components, wherein the audio system remains balanced through the speaker input terminals. For each channel of the system, a preamplifier produces a balanced output signal. Two power... | 06/22/1999 |
| 5912975 | Method and circuit for creating phantom sources using phase shifting circuitry In portable stereo radio receivers and television receivers, the loudspeakers therein may be separated only by a limited amount. This severely restricts the stereo image created by the loudspeakers. A circuit arrangement for creating an expanded stereo im... | 06/15/1999 |
| 5889867 | Stereophonic Reformatter A method of creating an impression of sound from an imaginary source to a listener. The method includes the step of determining an acoustic matrix for an actual set of speakers at an actual location relative to the listener and the step of determining an ... | 03/30/1999 |
| 5856759 | Audio output amplifier with parallel class AB stages A high output power is obtained for an audio power amplifier using an amplifier circuit topology wherein channels or stages of a multi-channel class AB monolithic integrated circuit are paralleled in order to drive a low impedance dual voice coil speaker.... | 01/05/1999 |
| 5815219 | Large screen video display system and television receiver A television receiver for automatically determining from a command issued from a controller, the control of power on/off, picture brightness and picture contrast of a video projector using a video projector controller contained in the television receiver ... | 09/29/1998 |
| 5787182 | Audio signal amplifier circuit and a portable audio equipment using the same The present invention resides in an audio amplifier circuit which includes an output terminal of an IC connected to a power amplifier circuit, a resistor having one end connected to a negative feedback input of the power amplifier circuit and the other en... | 07/28/1998 |
| 5771296 | Audio circuit An audio circuit for use in a television receiver and the like compensates for the capacity shortage of a speaker box or low frequency characteristic of the speaker to reproduce vivid and voluminous low frequency sound. L and R signals of the audio signal... | 06/23/1998 |
| 5742691 | Surround sound converter A surround sound converter for home audio systems includes outputs for a left front speaker, a right front speaker, a left rear speaker, a right rear speaker, and an auxiliary output to accommodate a rear auxiliary amplifier. The surround sound converter ... | 04/21/1998 |
| 5717766 | Stereophonic sound reproduction apparatus using a plurality of loudspeakers in each channel The present invention relates to sound reproduction apparatus comprising stereophonic amplifier means for amplifying left and right signals from any stereo emission source, and a plurality of loudspeakers disposed in two groups, namely one group on the le... | 02/10/1998 |
| 5673326 | Audio bass speaker driver circuit A bass audio circuit includes a first filter network which receives left and right channel input signals and produces two filtered signals by attenuating frequencies in the input signals above a first cutoff frequency. The two filtered signals are summed ... | 09/30/1997 |
| 5668339 | Apparatus for multiplexing an audio signal in a video-song playback system An apparatus for multiplexing audio signals in a disc-shaped video-song medium which includes a plurality of digital audio channels having stereo accompaniment music recorded therein, and a plurality of analog channels having stereo accompaniment music wh... | 09/16/1997 |
| 5666422 | Remote speaker for surround-sound applications A surround-sound system for use with conventional TV sets, using a wireless remote bipolar rear speaker (or two conventional speakers fed out of phase) for the surround (difference) channels. The use of the rear speaker(s) and the mono (left plus right) f... | 09/09/1997 |
| 5655025 | Circuit for automatically recognizing and receiving mono and stereo audio signals In a mono/stereo input circuit for use in an audio equipment, and more particularly in a circuit for automatically recognizing and receiving mono/stereo audio signals, although a mono connector is inserted into a stereo jack, such an insertion of the mono... | 08/05/1997 |
| 5610555 | Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus The apparatus includes output stage amplifiers for receiving the respective outputs of preamplifiers provided in correspondence to the left and right channels in a stereo system. Negative feedback circuits are provided in the respective output stage ampli... | 03/11/1997 |
| 5546468 | Portable speaker and amplifier unit A combination speaker and amplifier unit has speaker located on the front of a cabinet and speaker wire receptacles located in the back of the cabinet for providing speaker wire connections to a stereo unit. Also in the back of the cabinet is a power boos... | 08/13/1996 |
