Method and apparatus for adaptively superimposing bursts of texts over audio signals and decoder thereof
First Claim
1. An apparatus for adaptively superimposing bursts of digital data with analog sound signals, comprising an encoder and decoder, wherein said encoder comprise:
- means for entering original, unencoded audio program input signals;
means for dividing said unencoded audio program input signals into three portions;
means for time delaying a first portion of said unencoded input signals;
a variable high-pass filter means for generating an upper passband of said unencoded input signals;
a variable low-pass filter means for generating a lower passband of said unencoded input signals;
means for generating clock timing synchronization pulses;
means for measuring a first sound power level found at a predetermined narrow bandwidth of said upper baseband of second portion of said unencoded input signal;
means for measuring a second sound power level found at a predetermined bandwidth of said lower passband of third portion of said unencoded input signal;
means for measuring a plurality of power levels of said unencoded sound signals at a plurality of frequencies and at a plurality of bandwidths;
means for comparing said measured first power level with a predetermined first reference signal and subsequently generating first binary control signals therefrom;
means for comparing said measured second power level with a predetermined second reference signal and subsequently generating second binary control signals therefrom;
means for logically comparing said first binary control signals with said second binary control signals and subsequently triggering the generation of bursts of concatenated digital header signals, digital text signals, and digital footer signals therefrom;
means for modulating a frequency-modulator with said bursts of concatenated digital header signals, digital text signals, and digital footer signals;
means for bandlimiting said frequency-modulated signal resulting from said modulation means;
means for adaptively adjusting the output power level of said bandlimited frequency-modulated signal;
means for transmitting or recording said encoded signals;
wherein, said decoder comprise;
means for receiving said transmitted encoded signals;
means for dividing said received input signals into three portions;
means for bandlimiting the first portion of said received divided input signals;
means for amplifying and amplitude-limiting said bandlimited first portion of received input signals;
means for demodulating said amplified and amplitude-limited signal;
means for separating desired digital text from said demodulated digital signals;
means for converting said desired digital text into baseband video signals;
means for modulating the picture and sound carriers of a standard television modulator with said converted baseband video signals; and
,displaying said video signals containing said desired text concurrently with the received reproduced input sound signals using television reproduction means;
thereby allowing adaptive conveyance of text information with analog sound signals.
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Abstract
An apparatus is disclosed for adaptively superimposing bursts of text over audio signals comprising an encoder and a decoder wherein said encoder comprises means for separating unencoded audio signals into discrete passbands; means for measuring power levels contained in each discrete passband; a time delay; a plurality of power level comparators; means for generating concatenated bursts of digital header, digital text and digital footer signals; a frequency modulator; a modulator output power adjusting means; means for combining time delayed unencoded audio signals with modulator output level; and, means for transmitting or recording resultant encoded sound signals; wherein said decoder comprise means for separating received encoded sound into discrete passbands; an FM demodulator; a text separator; a television modulator; and sound reproduction means.
173 Citations
14 Claims
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1. An apparatus for adaptively superimposing bursts of digital data with analog sound signals, comprising an encoder and decoder, wherein said encoder comprise:
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means for entering original, unencoded audio program input signals; means for dividing said unencoded audio program input signals into three portions; means for time delaying a first portion of said unencoded input signals; a variable high-pass filter means for generating an upper passband of said unencoded input signals; a variable low-pass filter means for generating a lower passband of said unencoded input signals; means for generating clock timing synchronization pulses; means for measuring a first sound power level found at a predetermined narrow bandwidth of said upper baseband of second portion of said unencoded input signal; means for measuring a second sound power level found at a predetermined bandwidth of said lower passband of third portion of said unencoded input signal; means for measuring a plurality of power levels of said unencoded sound signals at a plurality of frequencies and at a plurality of bandwidths; means for comparing said measured first power level with a predetermined first reference signal and subsequently generating first binary control signals therefrom; means for comparing said measured second power level with a predetermined second reference signal and subsequently generating second binary control signals therefrom; means for logically comparing said first binary control signals with said second binary control signals and subsequently triggering the generation of bursts of concatenated digital header signals, digital text signals, and digital footer signals therefrom; means for modulating a frequency-modulator with said bursts of concatenated digital header signals, digital text signals, and digital footer signals; means for bandlimiting said frequency-modulated signal resulting from said modulation means; means for adaptively adjusting the output power level of said bandlimited frequency-modulated signal; means for transmitting or recording said encoded signals; wherein, said decoder comprise; means for receiving said transmitted encoded signals; means for dividing said received input signals into three portions; means for bandlimiting the first portion of said received divided input signals; means for amplifying and amplitude-limiting said bandlimited first portion of received input signals; means for demodulating said amplified and amplitude-limited signal; means for separating desired digital text from said demodulated digital signals; means for converting said desired digital text into baseband video signals; means for modulating the picture and sound carriers of a standard television modulator with said converted baseband video signals; and
,displaying said video signals containing said desired text concurrently with the received reproduced input sound signals using television reproduction means; thereby allowing adaptive conveyance of text information with analog sound signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for conveying digital text with existing analog sound signals, comprising an encoder and decoder, wherein said encoder comprises:
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means for entering an original, unencoded audio program input signal; time delay means; means for generating a plurality of discrete passbands; means for measuring specific power levels contained in said discrete passbands; means for comparing said measured power levels with reference power levels and subsequently generating control signals responsive to said comparing means; means for generating a bursts of concatenated digital header signals, digital text signals, and digital footer signals responsive to said comparing means; means for modulating a frequency-modulator with said bursts of concatenated digital signals; means for bandlimiting the frequency-modulated signals; means for adaptively adjusting the power level of said frequency-modulated signals; means for combining said adaptively power-adjusted signals with time delayed unencoded input signals; means for transmitting or recording said combined signals; wherein, said decoder comprises means for receiving said transmitted combined signals; means for generating a plurality of discrete passbands of said received signals; means for measuring specific power levels contained in said discrete passbands of said received signals; means for demodulating frequency-modulated signals found in passbands of said received signals; means for converting demodulated digital text into baseband video signals; means for modulating television modulators; television reproduction means; and
,sound reproduction means; thereby allowing adaptive conveyance of text information with analog sound signals. - View Dependent Claims (12, 13, 14)
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Specification