Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 4589129 | Signal decoding system A signal decoding system for use in a quadraphonic type sound reproducing system is disclosed. In accordance with one aspect of the invention, a multiband expander is used to control the steering of the four information signals decoded from the two input ... | 05/13/1986 |
| 4574391 | Stereophonic sound producing apparatus for a game machine A stereophonic sound producing apparatus employs four speakers, a background-sound input signal and input-sound signals, to provide an on-the-spot "live action" feeling. The sounds are combined and varied such that a sound such as an artillery shell has a... | 03/04/1986 |
| 4535474 | Audio ambience simulator An ambience simulating apparatus having a mixer for combining a plurality of at least two electrical analog signal representations of audio signals into a single analog signal, digitizing circuits for digitizing said single analog signal, a memory for sto... | 08/13/1985 |
| 4509191 | Electronic stereo reverberation device A stereo or two channel electronic reverberation device is disclosed comprising an analog delay device which receives audio signals and provides delayed output signals at a plurality of outputs, with the time delay period of each output being different fr... | 04/02/1985 |
| 4495637 | Apparatus and method for enhanced psychoacoustic imagery using asymmetric cross-channel feed Enhanced pyschoacoustic imagery is achieved in an audio signal processing circuit for processing plural channels of related audio signals. Asymmetric bi-directional audio signal cross-feed is established between first and second audio signal processing ch... | 01/22/1985 |
| 4464781 | Equalizer apparatus An equalizer apparatus for audio equipment capable of selecting between a 2-speaker system and a 4-speaker system, including a display device indicating proper operation of the control knobs of the equalizer. The display device includes a first illuminabl... | 08/07/1984 |
| 4369335 | Two-channel, four loudspeaker-component enhanced sterophonic system The present invention is an improved two-channel, four loudspeaker-component enhanced stereophonic system which includes a pair of front loudspeaker systems, a pair of rear loudspeaker systems and a pair of speaker enclosures into each of which one of the... | 01/18/1983 |
| 4332979 | Electronic environmental acoustic simulator Systems analysis approach to measure and to reconstruct the sound energy flux distribution characteristic of "live" situations. The present invention relates to a method of measurement of acoustical fields and the functional relationships in audio systems... | 06/01/1982 |
| 4303800 | Reproducing multichannel sound Apparatus for extracting recorded natural ambience from two audio channels while eliminating the cave-like quality of the sound of a soloist or announcer. The two channels are combined such that signals common to the two channels in a midrange of audio fr... | 12/01/1981 |
| 4275267 | Ambience processor An ambience processor receives and combines the left and right channel signals from a stereophonic amplifier. The resulting composite signal is converted to a sequence of digital signals which are stored in a random access memory. The stored digital repre... | 06/23/1981 |
| 4251688 | Audio-digital processing system for demultiplexing stereophonic/quadriphonic input audio signals into 4-to-72 output audio signals An audio-digital processing system for processing and converting audio localization data from stereophonic or quadriphonic input audio signals into digital localization data. Said digital localization data is further processed into digital commutation dat... | 02/17/1981 |
| 4204092 | Audio image recovery system A high fidelity playback system is described using a plurality of speakers in conjunction with a conventional stereo system and an auditory interface unit which provides improved high fidelity playback. The system includes for example, two front high fide... | 05/20/1980 |
| 4196314 | Sound distributing system improvements Apparatus is disclosed for cyclically communicating an audio electrical signal to a plurality of sound-reproducing elements in sequential, serial fashion. One embodiment includes a number of make-or-break type of electrical switches, one for each sound-re... | 04/01/1980 |
| 4132859 | Sound reproducing apparatus A unit for use in coupling a pair of loudspeakers to an amplifier having two channels comprises a transformer having a first winding and a second winding, one end of a first winding having a first connection device for connecting the first winding in seri... | 01/02/1979 |
| 4121059 | Sound field expanding device In a sound field expanding device, left and right channel sound signals of a two channel stereo are respectively divided into several frequency bands, adjusted on levels and phases, mixed again, and then supplied to loudspeakers, so as to reproduce a natu... | 10/17/1978 |
| 4097688 | Stereophonic reproducing system A stereophonic reproducing system having left signal and right signal channels and impedance provided between the two channels, whereby steady acoustic effects of 4-channel stereo may be simply obtained from 2-channel stereophonic signals.... | 06/27/1978 |
| 4053711 | Simulation of reverberation in audio signals An audio system which achieves a concert hall reverberation effect from a stereo input signal. From two stereo input signals the audio system produces quadraphonic signals suitable for application to four speakers in the pattern of a quadraphonic sound re... | 10/11/1977 |
| 4049912 | Channel mixer for multi-channel audio systems An audio system which achieves a concert hall reverberation effect from a stereo input signal. From two stereo input signals the audio system produces quadraphonic signals suitable for application to four speakers in the pattern of a quadraphonic sound re... | 09/20/1977 |
| 4027101 | Simulation of reverberation in audio signals An audio system which achieves a concert hall reverberation effect from a stereo input signal. From two stereo input signals the audio system produces quadraphonic signals suitable for application to four speakers in the pattern of a quadraphonic sound re... | 05/31/1977 |
| 4002835 | Multi-channel decoding circuit for two-channel audio systems The decoding circuit of the present invention is a passive circuit which connects to the output terminals of a conventional stereophonic amplifier for decoding additional hidden channels of sound from a stereophonic or quadraphonic source. The circuit cou... | 01/11/1977 |
| 4002836 | Audio signal distributor The Audio Signal Distributor (abbreviated ASD) is a device which takes the current from the amplifier output and distributes it in varying ratios to a plurality of speakers. The nature of the invention is a modified rheostat which divides the output curre... | 01/11/1977 |
| 3971890 | Method and apparatus for quadraphonic enhancement of stereophonic signals Method and apparatus are described for translating or "encoding" the left and right signals from a stereophonic source such that when the signals are reproduced by a four-channel decoder the resulting sound field is highly simulative of that produced from... | 07/27/1976 |
| 3969588 | Audio pan generator The apparent source of sound from a plurality of transducers arrayed around a listening area is automatically controlled by a prestored pattern sequencer and a series of variable voltage levels. The prestored patterns reflect switch connections to the tra... | 07/13/1976 |
| 3958085 | Compatible 4-2-4 encoding-decoding system A four channel stereophonic sound system requiring only two transmission channels and two audio amplifiers is disclosed wherein two different linear combinations of all four original discrete signals are recorded or transmitted, amplified and subsequently... | 05/18/1976 |
