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| Number | Title | Issue Date |
| 4326099 | Low frequency cabinet, in particular for a triphonic audio network The present invention covers a low frequency acoustic cabinet. The cabinet contains two enclosures holding at least one low frequency loud-speaker so that the front face of each loud-speaker radiates inside a cavity communicating with the outside through an op... | 04/20/1982 |
| 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 |
| 4239937 | Stereo separation control Improved circuitry for providing stereo separation control in audio playback systems wherein undesirable volume level change and undesirable signal degradation due to noise, distortion and crosstalk are substantially reduced or eliminated by utilizing, in... | 12/16/1980 |
| 4221006 | Balanced remote control This invention relates to a stereo system that maintains an equal listening level, automatically increasing or decreasing in relationship to interfering noises or the absence thereof while maintaining a balanced audio level from the speakers in relationsh... | 09/02/1980 |
| 4186273 | Stereophonic system having power amplifiers and speakers in a bridge circuit with capacitor connecting junction of speakers to common terminal Left and right stereo power amplifiers receive power from the 12-volt D.C. automobile supply bypassed by a single capacitor for both amplifiers and energize left and right loudspeakers in series with the junction of the series-connected speakers coupled t... | 01/29/1980 |
| 4182930 | Detection and monitoring device An improved audio signal processing system synthesizes from an audio signal, an enhanced audio signal by sensing signal energy of the audio signal within a preselected frequency portion of the audio signal, dividing the sensed signal energy into a plurali... | 01/08/1980 |
| 4164625 | A/C Circuit for combining an automobile radio speaker with speakers of an automobile stereophonic system A circuit arrangement for combining a car radio speaker into the circuit of a car stereo system having left and right speakers; to accomplish this changeover switches, control devices for sound volume, variable resistance apparatus, damping circuits on th... | 08/14/1979 |
| 4162457 | Expansion circuit for improved stereo and apparent monaural image An expander circuit for expanding stereo signals comprises left and right channel variable gain stages whose gain varies in proportion to the amplitude of the control signals fed to the control inputs thereof; and left and right channel expansion control ... | 07/24/1979 |
| 4035582 | Tremolo effect producing system A tremolo effect producing system comprises at least one electro-acoustic transducer such as a loudspeaker for converting an electrical audio signal to a sound, at least one acousto-electrical transducer such as a microphone for converting sound to an ele... | 07/12/1977 |
| 4006427 | Automatic gain control circuit In a recording system or the like including two, left and right, channels, an automatic gain control circuit for ensuring that the characteristics of the two channels always be substantially equal to each other, wherein a variable impedance circuit compri... | 02/01/1977 |
| 4004095 | System for time sharing an audio amplifier A switching system is described for accepting N-channel audio information and time sharing N/2 amplifiers to drive N-audio speakers. The time sharing switching system includes a timing oscillator, N-channel electronic input switches and an output switchin... | 01/18/1977 |
| 3992590 | Matrix amplifying circuit A matrix amplifying circuit comprises a first operational amplifier having an inverting and a non-inverting input terminal. The sum of the first and second channel signals is applied to the inverting terminal. The difference of the two channel signals is ... | 11/16/1976 |
| 3956709 | Balance control system for multichannel audio apparatus A balance control system for multichannel audio apparatus wherein stereophonic signals are transmitted through plural audio channels of the audio apparatus. The balance control system includes a balance control network connected to the audio channels for ... | 05/11/1976 |
| 3944941 | Switching circuit for use with balanced transformerless amplifier An output circuit for balanced amplifiers connected to one terminal of each of two loudspeakers with the other terminal of each loudspeaker connected together to the arm of a double-throw switch to make contact either with a terminal connected to the firs... | 03/16/1976 |
