Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 4961226 | Stereo electroacoustical transducing A stereo loudspeaker system has left and right cabinets that are the mirror image of each other. Each cabinet has a rear panel perpendicular to a side panel and an angled panel that forms an acute angle with the side and rear panels. The side panel carrie... | 10/02/1990 |
| 4837825 | Passive ambience recovery system for the reproduction of sound A multi-channel stereophonic system in which different audio signals are produced and caused to converge upon the ear of the listener at selectively spaced time intervals so as to enhance the realism of the sound impressed upon the listener. A pair of aux... | 06/06/1989 |
| 4819269 | Extended imaging split mode loudspeaker system Direct field sound, represented by the sum of left and right stereo input signals, is projected in a narrow dispersion pattern from a front radiating speaker 28,32 and reverberant field sounds, represented by difference between left and right stereo input... | 04/04/1989 |
| 4764960 | Stereo reproduction system First left and right channel loudspeakers having respective main axes of directivities directed toward left and right listening areas defined in front thereof are provided. In addition, there are provided a second right channel loudspeaker near the first ... | 08/16/1988 |
| 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 |
| 4586192 | Soundstage boundary expansion system A system for providing the effect of an extended soundstage comprises a pair of stereophonic loudspeakers, each having a movable or vibrational element driven by a pair of voice coils including a principal or main voice coil and an auxiliary or enhancemen... | 04/29/1986 |
| 4503553 | Loudspeaker system The disclosure relates to an audio signal reproduction system having one or more of the following features: (1) a loudspeaker having (a) a flat frequency response and (b) a predetermined power response; (2) two loudspeakers adapted to be positioned relati... | 03/05/1985 |
| 4445227 | Loudspeaker having improved directional characteristics A loudspeaker system (10) having improved directional and frequency response characteristics for use in connection with a sound system having at least two speakers such as a stereo system which is provided. The loudspeaker system includes a driver (14) fo... | 04/24/1984 |
| 4382157 | Multiple speaker type sound producing system A plurality of speaker devices are driven by two stereophonic audio signal sources through a signal distributing circuit having impedance means for equalizing the amplitudes of the driving signals applied to the speaker devices. The speaker devices thereb... | 05/03/1983 |
| 4308423 | Stereo image separation and perimeter enhancement A stereo enhancement system utilizes a difference signal derived from the left and right stereo channels in which the difference signal is delayed, amplified, and then added into the appropriate channels to cancel left/right speaker mixing at the listener... | 12/29/1981 |
| 4227050 | Virtual sound source system A virtual sound source system comprises a pair of speaker cabinets of unique design positioned along the front wall of a listening room. The speaker cabinets together with the front wall, sidewalls and ceiling of the room provide for playing back recordin... | 10/07/1980 |
| 4218585 | Dimensional sound producing apparatus and method A sound reproducing system having right and left speakers which transmit right and left stereo sounds, respectively. The right signal, in addition to driving the right speaker, is inverted and delayed to produce a compensating signal which is transmitted ... | 08/19/1980 |
| 4218583 | Varying loudspeaker spatial characteristics A loudspeaker system having two angled rear panels with four drivers on each rear panel and a single driver on the front panel has the drivers connected in series between first and second terminals and a third terminal connected to the junction of the fro... | 08/19/1980 |
| 4199658 | Binaural sound reproduction system The speaker system of the invention comprises a pair of inner and outer rightward loudspeakers and a pair of inner and outer leftward loudspeakers all of which are arranged such that their points of sound transmission are aligned on an equal vertical stra... | 04/22/1980 |
| 4191852 | Stereophonic sense enhancing apparatus An apparatus fo effectively increasing stereophonic sense when the distance between left and right loudspeakers is small is disclosed. This apparatus enlarges the apparent distance between the left and the right sources of sound by vectorially adding the sound... | 03/04/1980 |
| 4133975 | Loudspeaker system with broad image source with directionality control for the tweeter A loudspeaker system comprises a woofer in a front panel, a midrange driver facing to the front and a tweeter in a corner panel separated from the midrange driver by the woofer and pointing to the front and side with a crossover network arranged to energi... | 01/09/1979 |
