Source: http://www.google.nl/patents/US5612943?hl=nl
Timestamp: 2013-05-19 14:35:46
Document Index: 393747590

Matched Legal Cases: ['art 1997', 'art 1988', 'art 1992', 'art 1995', 'art 1999', 'art 199815', 'art 200024', 'art 2002', 'art 2003', 'art 200225', 'art 200320', 'art 200328', 'art 2010', 'art 2012', 'art 200515', 'art 2013', 'art 2013', 'art 20116', 'art 2012', 'art 2001', 'art 20115']

Patent US5612943 - System for carrying transparent digital data within an audio signal - Google PatentenZoeken Afbeeldingen Maps Play YouTube Nieuws Gmail Drive Meer » Geavanceerd zoeken naar patenten | Webgeschiedenis | Inloggen Geavanceerd zoeken naar patenten PatentenA signal processing system comprises inputs for an analog audio signal and a digital data signal. The digital data signal is modulated to an analog data signal in an inaudible frequency band. Filters are used to ensure that the audio signal is restricted to audible frequencies and that the analog data...http://www.google.nl/patents/US5612943?utm_source=gb-gplus-sharePatent US5612943 - System for carrying transparent digital data within an audio signal PublicatienummerUS5612943 APublicatietypeVerlening Aanvraagnummer08/270,252 Publicatiedatum18 maart 1997 Aanvraagdatum5 juli 1994 Prioriteitsdatum5 juli 1994Ook gepubliceerd alsWO1998008218A1 UitvindersNorman DurkeeCharles H. HustigRobert W. Moses Oorspronkelijke patenteigenaarDurkee; NormanHustig; Charles H.Moses; Robert W. Classificatie in de VS369/124.9360/32369/59.16G9B/20.4G9B/20.14360/29 Internationale classificatieG11B20/02G11B20/10 Co�peratieve classificatieG11B20/02G11B20/10527 Europese classificatieG11B 20/02G11B 20/10CReferentiesPatentcitaties (15) Verwijzingen naar dit patent (76)Externe linksUSPTO USPTO-toewijzing EspacenetSystem for carrying transparent digital data within an audio signalUS 5612943 A Samenvatting A signal processing system comprises inputs for an analog audio signal and a digital data signal. The digital data signal is modulated to an analog data signal in an inaudible frequency band. Filters are used to ensure that the audio signal is restricted to audible frequencies and that the analog data signal is restricted to inaudible frequencies. The two analog signals are then combined into a composite analog signal. The composite signal is stored on a medium such as a compact disc. Filters are used to extract and separate the two analog signals from the composite signal stored on the medium. The analog data signal is demodulated to retrieve the original digital data signal.
What is claimed is: 1. A system for combining an unmodulated first analog signal and a digital signal, said system comprising: means for modulating said digital signal to a second analog signal different from said first analog signal; a first filter for attenuating, in a first frequency band, the amplitude of said second analog signal; a second filter for attenuating, in a second frequency band, the amplitude of said first analog signal, said first and second bands being nonoverlapping; means for combining said first and second filtered analog signals to form a single composite analog signal, a third filter for attenuating, in said second frequency band, the amplitude of said composite signal to extract said first analog signal; a fourth filter for attenuating, in said first frequency band, the amplitude of said composite signal to extract said second analog signal; means for demodulating said second analog signal to said digital signal; and wherein: said first band consists of frequencies below a -3 dB cutoff frequency, said second band consists of frequencies above said cutoff frequency, said first signal consists essentially of frequencies contained within said first band, and said second signal consists essentially of frequencies contained within said second band.
3. A system for combining an unmodulated first analog signal and a digital signal, said system comprising: means for modulating said digital signal to a second analog signal different from said first analog signal; a first filter for attenuating, in a first frequency band, the amplitude of said second analog signal; a second filter for attenuating, in a second frequency band, the amplitude of said first analog signal, said first and second bands being nonoverlapping; means for combining said first and second filtered analog signals to form a single composite analog signal, a third filter for attenuating, in said second frequency band, the amplitude of said composite signal to extract said first analog signal; a fourth filter for attenuating, in said first frequency band, the amplitude of said composite signal to extract said second analog signal; and means for demodulating said second analog signal to said digital signal; and wherein said modulator and said demodulator utilize phase shift keying technology.
4. A System for combining an unmodulated first analog signal and a digital signal, said system comprising: means for modulating said digital signal to a second analog signal different from said first analog signal; a first filter for attenuating in a first frequency band, the amplitude of said second analog signal; a second filter for attenuating, in a second frequency band, the amplitude of said first analog signal, said first and second bands being nonoverlapping; means for combining said first and second filtered analog signals to form a single composite analog signal, a third filter for attenuating, in said second frequency band, the amplitude of said composite signal to extract said first analog signal; a fourth filter for attenuating, in said first frequency band, the amplitude of said composite signal to extract said second analog signal; and means for demodulating said second analog signal to said digital signal; and wherein said modulator and said demodulator utilize quadrature phase shift keying technology.
5. A system for combining an unmodulated first analog signal and a digital signal, said system comprising: means for modulating said digital signal to a second analog signal different from said first analog signal; a first filter for attenuating, in a first frequency band, the amplitude of said second analog signal; a second filter for attenuating, in a second frequency band, the amplitude of said first analog signal, said first and second bands being nonoverlapping; means for combining said first and second filtered analog signals to form a single composite analog signal, a third filter for attenuating, in said second frequency band, the amplitude of said composite signal to extract said first analog signal; a fourth filter for attenuating, in said first frequency band, the amplitude of said composite signal to extract said second analog signal; and means for demodulating said second analog signal to said digital signal; and wherein said modulator and said demodulator utilize frequency shift keying technology.
6. A method for combining an unmodulated first analog signal and a digital signal, said process comprising: modulating said digital signal to a second analog signal different from said first analog signal; attenuating, in a first frequency band, the amplitude of said second analog signal; attenuating, in a second frequency band, the amplitude of said first analog signal, said first and second bands being nonoverlapping; combining said first and second analog signals to form a single composite analog signal; attenuating, in said second frequency band, the amplitude of said composite signal to extract said first analog signal; attenuating, in said first frequency band, the amplitude of said composite signal to extract said second analog signal; demodulating said second analog signal to said digital signal; and wherein: said first band consists of frequencies below a -3 dB cutoff frequency, said second band consists of frequencies above said cutoff frequency, said first signal consists essentially of frequencies contained within said first band, and said second signal consists essentially of frequencies contained within said second band.
8. A method for combining an unmodulated first analog signal and a digital signal, said process comprising: modulating said digital signal to a second analog signal different from said first analog signal; attenuating, in a first frequency band, the amplitude of said second analog signal; attenuating, in a second frequency band, the amplitude of said first analog signals, said first and second bands being nonoverlapping; combining said first and second analog signals to form a single composite analog signal; attenuating, in said second frequency bands, the amplitude of said composite signal to extract said first analog signal; attenuating, in said first frequency bands, the amplitude of said composite signal to extract said second analog signal; demodulating said second analog signal to said digital signal; and wherein the steps of modulating said digital signal, and of demodulating said second analog signal are performed utilizing phase shift keying technology.
9. A method for combining an unmodulated first analog signal and a digital signal, said process comprising: modulating said digital signal to a second analog signal different from said first analog signal; attenuating, in a first frequency band, the amplitude of said second analog signal; attenuating, in a second frequency band, the amplitude of said first analog signal, said first and second bands being nonoverlapping; combining said first and second analog signals to form a single composite analog signal; attenuating, in said second frequency band, the amplitude of said composite signal to extract said first analog signal; attenuating, in said first frequency band, the amplitude of said composite signal to extract said second analog signal; demodulating said second analog signal to said digital signal; and wherein the steps of modulating said digital signal, and of demodulating said second analog signal are performed utilizing quadrature phase shift keying technology.
10. A method for combining an unmodulated first analog signal and a digital signal, said process comprising: modulating said digital signal to a second analog signal different from said first analog signal; attenuating, in a first frequency band, the amplitude of said second analog signal: attenuating, in a second frequency band, the amplitude of said first analog signal, said first and second bands being nonoverlapping: combining said first and second analog signals to form a single composite analog signal; attenuating, in said second frequency band, the amplitude of said composite signal to extract said first analog signal; attenuating, in said first frequency band, the amplitude of said composite signal to extract said second analog signal; demodulating said second analog signal to said digital signal; and wherein the steps of modulating said digital signal, and of demodulating said second analog signal are performed utilizing frequency shift keying technology.
TECHNICAL FIELD This invention relates generally to a signal processing system, and more particularly to a signal processing system for transparently transporting a digital signal in an audio signal.
BACKGROUND OF THE INVENTION Signals may be represented mathematically as functions of time and, more particularly as either analog (continuous-time) signals or digital (discrete-time) signals. As used herein, analog signals are defined for a continuum of time values and may be represented, for example, by a continuously time-varying electrical voltage. Digital signals, in contrast, are defined only at discrete points in time and may, for example, be represented by a series of electrical voltage pulses. Each represents a bit (i.e., a 0 or a 1), and accordingly, the series of pulses or bits is described as a bitstream, or a series of 0's and 1's. The bitstream may represent data or it may represent, numerically, the strength or amplitude, of a continuous signal at discrete points in time.
SUMMARY OF THE INVENTION The foregoing problems are solved and a technical advance is achieved by an economical signal processing system that can transparently record and retrieve, inaudibly and at flexible transfer rates, digital data within an analog audio signal. In a departure from the art, in an encoding portion of the signal processing system, a digital data signal is converted (modulated) to an analog data signal at an inaudible frequency band. The analog data signal is then combined with the analog audio signal to form a single composite analog signal. In a decoding portion of the signal processing system, filters are used to retrieve and separate the audio signal and the analog data signal from the composite signal. The analog data signal is then demodulated to a digital data signal. The digital data signal and the analog audio signal are then supplied to appropriate processing equipment via digital and analog outputs respectively.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a functional block diagram of a preferred embodiment of a signal processing system embodying features of the present invention;
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT In FIG. 1, the reference numeral 10 designates a signal processing system of the present invention which is utilized for transparently recording and retrieving, inaudibly and at flexible transfer rates, digital data within an analog audio signal. The system 10 includes an encoder 12 and a decoder 14. An analog, audio signal on line 16 and a digital data signal on line 18 are input to the encoder 12 and combined therein to produce a composite analog audio signal in which the data portion thereof is inaudible to the human ear. The composite signal is output from the encoder 12, as represented by line 20, to an audio recorder 22. The audio recorder 22 records the composite signal onto a standard audio storage medium 24 which is used to store the signal and subsequently play it back to the audio player 26, as represented by lines 28 and 30, respectively. The composite signal is output from the audio player 26, as represented by line 32, to the decoder 14. The decoder 14 separates the composite signal into its original analog audio and digital data components. Lines 34 and 36 output from the decoder analog audio and digital data signals, respectively.
FIG. 4 illustrates in greater detail the FSK modulator circuitry 202 of the encoder portion 12 of the present invention. The circuitry 202 comprises an input connector 400, a 32 MHz oscillator 402, a divider network 404, a four-bit binary counter 406, a resister array 408, a low pass filter 410, and an output connector 412. The connector 400 receives data bits from the line 18 at, for example, 1200 baud, and outputs the bits serially to the divider network 404. The divider network 404 receives a 32 MHz signal from the oscillator 402 and outputs to the counter 406 either a 296 (16 whether the last bit received from the connector 400 was a 0 or a 1, respectively. The counter 406 outputs four signals on four lines to the resister array 408 for each clock cycle that it receives from the network 404. The output from the array 408 then traces, as a function of time, a 16 step sine wave at a rate of 18.5 or 19.5 kHz, the rate depending on whether the last bit received from the connector 400 was a 0 or a 1, respectively. The stepped sine wave output from the array 408 is then passed through the filter 410 which "smooths" the waveform, the waveform representing the modulated data input to the connector 400, and then outputs the smoothed waveform onto the line 210 via the connector 412.
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