Did You Know...
...that the video game, Pong, was invented by a guy who graduated at the bottom of his engineering class? Nolan Bushnell spent more time running the games at a local amusement park than he did on his studies at the University of Utah. His dreams of working for Disney's amusement empire were dashed when the company wouldn't hire him. Taking a boring job, Nolan daydreamed about electronic versions of popular games. He invented Pong, the first video game, and went on to found Atari Co.
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| Number | Title | Issue Date |
| 5459790 | Personal sound system with virtually positioned lateral speakers A head mounted surround sound virtual positioning system that includes a video recorder (200), which is operable to have disposed therein a tape (202), having a surround sound audio track associated therewith. The surround sound system is encoded on two c... | 10/17/1995 |
| 5426702 | System for deriving a center channel signal from an adapted weighted combination of the left and right channels in a stereophonic audio signal The system includes a direction detection circuit (32) for deriving a measure (Vwh) for a direction of a direction vector (Wh) which vector, in a state area in which combinations (R,L) of signal values of the left and right channel signals are shown at sp... | 06/20/1995 |
| 5333200 | Head diffraction compensated stereo system with loud speaker array A stereo audio processing system for a stereo audio signal processing reproduction that provides improved source imaging and simulation of desired listening environment acoustics while retaining relative independence of listener movement. The system first... | 07/26/1994 |
| 5325440 | Loudness control circuit A loudness control circuit emphasizes low frequency components in audio signals. A secondary low-pass filter select low frequency components of the audio signals, inverting a phase of the audio signals. The phase-inverted signals and audio signals are res... | 06/28/1994 |
| 5307415 | Surround processor with antiphase blending and panorama control circuitry A surround processor includes a time constant processing circuit for smoothing directional information signals from a detector with continuously variable time constants in order to generate one or more control voltage signals. The time constants produced ... | 04/26/1994 |
| 5307418 | Center channel speaker having multiple interconnected backload amplifying chambers for surround sound stereo audio systems The present invention is a multi-chamber two-way center channel speaker for an audio system which has four stereo surround sound channels including a right front channel, a left front channel, a rear surround channel and a center channel. The preferred em... | 04/26/1994 |
| 5297209 | System for calibrating sound field When a stereophonic broadcasting signal is interrupted because an electric field has weakened, a pilot signal 1 which designates that the electric field is not strong enough to separate an R-channel signal and an L-channel signal from a signal received by... | 03/22/1994 |
| 5265166 | Multi-channel sound simulation system A multi-channel sound simulation system for processing a stereophonic signal having a high frequency component for use with at least a pair of primary loudspeakers and a pair of secondary loudspeakers includes a receiving member for receiving the stereoph... | 11/23/1993 |
| 5263087 | Time constant processing circuit for surround processor A method and apparatus for generating control voltage signals in a surround sound processor is disclosed which utilizes a one-shot monostable multivibrator for minimizing intermodulation distortion while following rapid directional changes, yet minimizing... | 11/16/1993 |
| 5251260 | Audio surround system with stereo enhancement and directivity servos A audio surround system particularly arranged for use in a theater provides the enhanced ambience and wide sound image advantages of a stereo enhancement system (SRS system) having directivity servos. A stereo enhancement system known as the "SRS" enhance... | 10/05/1993 |
| 5243656 | Audio circuit In a multi-channel audio circuit, a plurality of input signals are supplied to corresponding amplifiers each respectively connected to speakers, at least one of the input signals being inverted. The speaker connected to the amplifier receiving the inverte... | 09/07/1993 |
| 5243660 | Directional microphone system A directional microphone system gain adjusts the sum of signals that are received from two microphones mounted less than an inch apart. The gain adjustment is generally proportional to the product of the two microphone signals. Analog multipliers are used... | 09/07/1993 |
| 5228085 | Perceived sound A stereo audio system includes a plurality of drivers and a signal processor circuit. The signal processing circuit has at least a left channel input and a right channel input, and provides at least one processed signal on at least one output. The process... | 07/13/1993 |
| 5197100 | Audio circuit for a television receiver with central speaker producing only human voice sound An audio circuit for a television receiver wherein a left-hand speaker is disposed on a left side of a screen of a television receiver, a right-hand speaker is disposed on a right side of the screen, and a central speaker is disposed above and below the s... | 03/23/1993 |
| 5197099 | Multiple-channel audio reproduction apparatus A multiple-channel audio reproduction apparatus has an audio demodulator for demodulating an input signal to produce audio signals for multiple channels. One or more signal-processing circuits process audio signals of one or more of these channels in a wa... | 03/23/1993 |
| 5181249 | Three channel audio transmission and/or reproduction systems In order to permit three-component (left, right and back) audio signals (LS, RS, BS) to be conveyed by a three-channel (left, right and mono) transmission system and still permit stereo and mono compatibility, the signals are encoded so that the three cha... | 01/19/1993 |
| 5113447 | Method and system for optimizing audio imaging in an automotive listening environment An audio system having an improved sound field by generating a center audio channel from left and right stereo channels. The center channel is preferably generated by summing the left and right channels, and then filtering the resulting output. The center... | 05/12/1992 |
| 5068897 | Mobile acoustic reproducing apparatus A center loudspeaker is disposed near the middle between the left channel loudspeaker arranged at the front left side of the compartment and the right channel loudspeaker at the front right side, and this center loudspeaker transforms into a sound by the ... | 11/26/1991 |
| 5027403 | Video sound A sound projection apparatus for a video display device having left and right speakers, first and second ambience speakers, and an amplifier having a right channel and left channel. In this system, connection of the left channel to a speaker produces a le... | 06/25/1991 |
| 4980915 | Center mode control circuit A center mode control circuit includes an amplifying portion (31) for amplifying a center input signal, a switch (34) connected to an input terminal of the amplifying portion, and capacitors (35, 36) selected by the switch and having different characteris... | 12/25/1990 |
| 4953213 | Surround mode stereophonic reproducing equipment The invention provides surround mode stereophonic reproducing equipment for using the Dolby surround mode and another surround mode other than the Dolby mode by means of selectively switching between them. The equipment is provided with two front power am... | 08/28/1990 |
| 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 |
| 4841573 | Stereophonic signal processing circuit A stereophonic signal processing circuit is designed to be provided with a pair of level compression circuits compressing peak levels of a pair of stereophonic input signals into 1/2 power each, an arithmetic mean circuit determining an arithmetic mean be... | 06/20/1989 |
| 4750208 | Audio-band electromechanical vibration converter Audio-band electromechanical vibration converter characterized in that a yoke having a permanent magnet and a magnetic gap formed therein is displaceably housed by a damper in a casing to which a vibration plate is attached; a coil attached to the casing ... | 06/07/1988 |
| 4747142 | Three-track sterophonic system In a stereophonic reproduction system, a true center-channel signal is derived by combining the left and right signals into a monophonic signal, and canceling and overriding this monophonic signal with a second modified monophonic signal, the latter deriv... | 05/24/1988 |
| 4685136 | Triphonic sound system In a conventional stereo system, provided the listener remains equidistant from the left and right speakers, the common portions of the left and right signals produce in the mind of the listener the virtual source of sound thought to be located between th... | 08/04/1987 |
| 4622689 | Stereophonic sound system A stereophonic sound system has the conventional components of a stereo pre-amplifier, to receive and amplify left and right audio signals, originating from left and right channel microphones, and feed left and right power amplifiers for left and right lo... | 11/11/1986 |
| 4594730 | Apparatus and method for enhancing the perceived sound image of a sound signal by source localization This invention relates to an apparatus and to a method for enhancing the perceived sound image of a stereophonic, audio reproduction system whose inputs are a right and a left signal channel by decoding the right and left signal channels into a modified r... | 06/10/1986 |
| 4521906 | Speaker systems for producing balanced stereo images at multiple locations A stereo speaker system is shown having at least three individual speakers arranged along a path, with one of the speakers positioned between the other two speakers and connected to receive signals from a selected one of a pair of left and right signal ou... | 06/04/1985 |
| 4516257 | Triphonic sound system A triphonic sound system in which three independent stereophonically related audio frequency source signals L, R and C are combined to derive three other audio frequency signals M, S, and T which respectively comprise (L+1.4C+R, (L-R) and (-1.4C). In a pr... | 05/07/1985 |
| 4509184 | Stereo sound system A stereo sound system for reproducing signals from two independent channels through right and left speakers. The two speakers are centrally located and propagate a lesser part of their acoustic output directly into free space. Two acoustic tunnels separat... | 04/02/1985 |
| 4495638 | Audio-band electro-mechanical vibration converter A device for giving an audio signal to a coil associated with an audio-band electromechanical converter uses a mixer, a first-stage low-pass filter, a limited and a second-stage low pass filter to correct distortion of the wave form of a signal from the l... | 01/22/1985 |
| 4466117 | Microphone for stereo reception A microphone for receiving acoustic vents stereophonically in accordance with a center-side method comprises a plurality of transducers including at least one having a unilateral directional characteristic particularly cardioid or hypercardioid and at lea... | 08/14/1984 |
| 4443889 | Acoustic apparatus and method An improved method and apparatus for reproducing sound includes a third channel which is derived from the pair of signals representing traditional left and right stereophonic channels and which represents a linear algebraic difference between such a pair ... | 04/17/1984 |
| 4408095 | Acoustic apparatus An acoustic apparatus comprised of a means for extracting middle and high frequency components from left- and right-channel signals through respective high-pass filters to reproduce the components, and a means for mixing left- and right-channel signals an... | 10/04/1983 |
| 4293821 | Audio channel separating apparatus Apparatus is disclosed for separating two audio signals on two input channels and combining them to provide three output signals on three output channels in which the separation is based on comparisons of the average absolute values of the highest amplitu... | 10/06/1981 |
| 4206324 | Pivoted plural microphone assembly A novel microphone assembly including three microphones which are rotatably or pivotably supported relative to each other and relative to a supporting handle housing structure wherein the left and right microphones rotate the same amount relative to a cen... | 06/03/1980 |
| 4074083 | Stereophonic sound system particularly useful in a cinema auditorium A network is described which processes two channel stereophonic sound programs for playback through left, right and center sound reproduction channels. Use of the network allows certain advantages of a three channel program to be obtained from the two cha... | 02/14/1978 |
| 4039755 | Auditorium simulator economizes on delay line bandwidth A filter network for use with an acoustic signal reproduction system having at least two, spatially separable, speaker means each capable of reproducing acoustic waves from corresponding electrical signal. The network includes a frequency divider for sepa... | 08/02/1977 |
| 4024344 | Center channel derivation for stereophonic cinema sound In a stereophonic reproduction system, especially for a cinema, a center channel signal is derived by combining left and right channel signals. In order to harden the center image, particularly in speech, the left and right channel signals are compared an... | 05/17/1977 |
