Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 7428308 | Transmitting and reproducing stereophonic audio signals Apparatus and method for transmitting and reproducing stereophonic audio signals are disclosed. The method comprises splitting first and second channels into two frequency bands, combining the lower frequency band signals of the two channels, and transmitting the co... | 09/23/2008 |
| 7149312 | Method and device to retrieve RDS information To retrieve RDS information by filtering and transforming an incoming multiplex signal (m(t)) into a RDS baseband signal, an amplitude modulated RDS signal (ma(t), mc(t)) is derived on basis of an intermediate signal (ma(t)) obtained... | 12/12/2006 |
| 6671378 | Detection of noise in a frequency demodulated FM audio broadcast signal The noise in a frequency demodulated audio signal is detected on basis of the characteristics of the stereo-multiplex signal to obtain a very reliable information that can be used for the sliding stereo-mono transition, noise blanking and a de-noising of ... | 12/30/2003 |
| 6295362 | Direct digital synthesis of FM signals A digital FM signal generator allows the generation of a modulated FM signal for broadcasting without the need for an analog modulator. The signal generator includes a digital signal processor which receives left and right signals from left and right sign... | 09/25/2001 |
| 5119503 | Apparatus and methods for broadcasting auxiliary data in an FM stereo broadcast system Apparatus and methods are disclosed for broadcasting auxiliary data in an FM stereo broadcasting system. The auxiliary data is broadcast in addition to regular audio broadcast programs including musical selections, and includes data which identifies the m... | 06/02/1992 |
| 4534054 | Signaling system for FM transmission systems A signaling system for FM transmission systems is disclosed that utilizes one or more so-called quadrature subcarriers for transmitting at least one data signal, including signaling tones, digital data, program material, or the like. The signal is modulat... | 08/06/1985 |
| 4266093 | Compatible four channel radio broadcast and receiving system A compatible four channel system primarily for use in conjunction with a radio transmission system for transmitting four individual audio signals over a medium having primary and secondary information channels and first and second auxiliary information ch... | 05/05/1981 |
| 4190737 | Compatible four channel FM system A four channel FM system is described. In one embodiment the usual 19 kHz pilot signal is employed to switch between front and rear information, while in another, a 76 kHz switching signal is employed for this purpose.... | 02/26/1980 |
| 4041244 | Composite stereophonic signal generator A stereophonic signal generator for generating a composite signal for effectively attenuating undesired spurious signals in a modulated signal, e.g., in a four channel stereophonic signal. In the generator, the main spurious signal, which is a spurious si... | 08/09/1977 |
| 4039752 | FM four channel stereo signal generator This invention provides an FM four channel stereo signal generator for generating from four stereophonically related audio signals an FM four channel stereo signal expressed by (S1 +S2 +S3 +S4) + (S1 ... | 08/02/1977 |
| 3967069 | Compatible four channel FM system A four channel FM system is described. In one embodiment the usual 19 kHz pilot signal is employed to switch between front and rear information, while in another, a 76 kHz switching signal is employed for this purpose.... | 06/29/1976 |
| 3944747 | Multiple channel FM stereo system A transmitter or a receiver processes four-channel stereo frequency-modulation information. The information represents four audio signals A, B, C and D that correspond to sources respectively located at the left-front, right-front, left-rear and right-rea... | 03/16/1976 |
| 3943294 | Multi-mono FM system A multi-mono FM transmission and reception system is provided whereby during a portion of the programming a four-channel music system can be broadcast and received and during another portion of the programming four discrete languages can be broadcast and ... | 03/09/1976 |
| 3937896 | Compatible four channel radio broadcast and receiving system A compatible four channel system for use in conjunction with a radio transmission system for transmitting four individual audio signals over a medium having primary and secondary information channels and first and second subsidiary information channels, t... | 02/10/1976 |
| 3934092 | Four channel stereophonic broadcasting system A broadcast system capable of transmitting and receiving a broadcast signal containing four discrete stereophonically related audio frequency inputs in which there is produced within the transmitter four matrix outputs, each of which is a function of one ... | 01/20/1976 |
