US3905039A
Expired / Lapsed
US
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System for band conversion of color picture signal
Assignee: Hitachi Ltd
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Filing: 1973-09-12
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Granted: 1975-09-09
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Expires: 1993-09-12
Abstract
Abstract A system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band and a system for reconverting a field sequential color picture signal of a narrow band into a simultaneous color picture signal of a wide band. The former system comprises memory means capable of varying the writing speed and the reading speed and having the memory capacity capable of storing a picture signal of one frame, means for switching two input signals to output them at every field period, means for obtaining one of the two chrominance signals of a simultaneous color picture signal at the odd numbered field and obtaining the other chrominance signal at the even numbered field by means of the switching means, and means for writing at a high speed and reading at a low speed in and from the memory means the luminance signal and the chrominance signals different at every field of the color picture signal. The latter system comprises memory means capable of varying the writing speed and the reading speed, having the memory capacity capable of storing a picture signal of one frame, capable of repeatedly reading the stored signal therefrom, and capable of simultaneously reading therefrom signals differing by one field period from each other, means for writing a signal of one frame of a field sequential color picture signal of a narrow band in the memory means at a low speed, and means for repeatedly reading the stored signal at a high speed and obtaining two chrominance signals from the simultaneously read out signals differing by one field period.
Inventors
- 👤 Yasufumi Yumde
- 👤 Takashi Furuhata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:14
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/86; H04N11/00; H04N11/02; H04N5/00; H04N5/76; H04N5/91; H04N5/915
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
208 words
A stationary color picture signal band conversion system for converting a simultaneous color picture signal of a wide band consisting of a luminance signal and two kinds of chrominance signals into a field sequential color picture signal of a narrow band, comprising: memory means having the memory capacityy capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed; means for switching two kinds of chrominance signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; and means for reading the signals written in the memory means after completion of the writing at a speed lower than the writing speed to output them.
Claim 2
Dependent Claim
208 words
A stationary color picture signal band conversion system for converting a simultaneous color picture signal of a wide band consisting of a luminance signal and two kinds of chrominance signals into a field sequential color picture signal of a narrow band, comprising: memory means having the memory capacityy capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed; means for switching two kinds of chrominance signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; and means for reading the signals written in the memory means after completion of the writing at a speed lower than the writing speed to output them.
Claim 3
Dependent Claim
265 words
A stationary color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: memory means having the memory capacity capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed, the memory means including; analog to digital converting means, a shift register supplied with the output signal of the analog to digital converting means, digital to analog converting means for converting the output signal of the shift register into an analog signal, and clock pulse generating means for generating clock pulses whose period can be varied and which are supplied to the shift register; means for switching two input signals at everyy field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominace signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; and means for reading the signals written in the memory means at a speed lower than the writing speed to output them.
Claim 4
Dependent Claim
265 words
A stationary color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: memory means having the memory capacity capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed, the memory means including; analog to digital converting means, a shift register supplied with the output signal of the analog to digital converting means, digital to analog converting means for converting the output signal of the shift register into an analog signal, and clock pulse generating means for generating clock pulses whose period can be varied and which are supplied to the shift register; means for switching two input signals at everyy field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominace signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; and means for reading the signals written in the memory means at a speed lower than the writing speed to output them.
Claim 5
Dependent Claim
219 words
A color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: meMory means having the memory capacity capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed; means for switching two input signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; means for reading the signals written in the memory means at a speed lower than the writing speed to output them; and means for adding an index signal to the color picture signal converted into the signal of the narrow band.
Claim 6
Dependent Claim
219 words
A color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: meMory means having the memory capacity capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed; means for switching two input signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; means for reading the signals written in the memory means at a speed lower than the writing speed to output them; and means for adding an index signal to the color picture signal converted into the signal of the narrow band.
Claim 7
Dependent Claim
300 words
A color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: memory means having the memory capacity capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed; means for switching two input signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; means for reading the signals written in the memory means at a speed lower than the writing speed to output them; means for generating a color carrier wave signal having the frequency an integer times as high as the horizontal scanning frequency of the picture signal; phase inverting means; means for modulating the color carrier wave signal with one of the two kinds of chrominance signals at one of the two field periods of one frame and for writing the modulated signal in the memory means; and means for modulating the color carrier wave signal passed through the phase inverting means with the other chrominance signal at the other field period and for writing the latter modulated signal in the memory means.
Claim 8
Dependent Claim
300 words
A color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: memory means having the memory capacity capable of storing a picture signal of one frame and capable of varying the writing speed and the reading speed; means for switching two input signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; means for reading the signals written in the memory means at a speed lower than the writing speed to output them; means for generating a color carrier wave signal having the frequency an integer times as high as the horizontal scanning frequency of the picture signal; phase inverting means; means for modulating the color carrier wave signal with one of the two kinds of chrominance signals at one of the two field periods of one frame and for writing the modulated signal in the memory means; and means for modulating the color carrier wave signal passed through the phase inverting means with the other chrominance signal at the other field period and for writing the latter modulated signal in the memory means.
Claim 9
Dependent Claim
159 words
A color picture signal band conversion system for converting a field sequential color picture signal of a narrow band into a simultaneous color picture signal of a wide band, comprising: memory means with two read-out output terminals having the memory capacity capable of storing a picture signal of one frame, capable of varying the writing speed and the reading speed, capable of repeatedly reading the stored signals, and capable of simultaneously reading signals differing by one field period; means for writing one frame signal of the picture signal of the narrow band in the memory means at a low speed corresponding to the transmission speed of the picture signal; and means for repeatedly reading, upon completion of the writing, the content of the memory means at a high speed corresponding to the signal of the wide band to simultaneously provide chrominance signals at the two output terminals and to provide a luminance signal at one of the output terminals.
Claim 10
Dependent Claim
159 words
A color picture signal band conversion system for converting a field sequential color picture signal of a narrow band into a simultaneous color picture signal of a wide band, comprising: memory means with two read-out output terminals having the memory capacity capable of storing a picture signal of one frame, capable of varying the writing speed and the reading speed, capable of repeatedly reading the stored signals, and capable of simultaneously reading signals differing by one field period; means for writing one frame signal of the picture signal of the narrow band in the memory means at a low speed corresponding to the transmission speed of the picture signal; and means for repeatedly reading, upon completion of the writing, the content of the memory means at a high speed corresponding to the signal of the wide band to simultaneously provide chrominance signals at the two output terminals and to provide a luminance signal at one of the output terminals.
Claim 11
Dependent Claim
45 words
A band conversion system according to claim 5, comprising delay means havinG the delay time of one half of one scanning line period and means for outputting the chrominance signal read from one of the output terminals of the memory means through the delay means.
Claim 12
Dependent Claim
33 words
A band conversion system according to claim 6, in which the memory means comprises series connected two memory means each having the memory capacity capable of storing a picture signal of one field.
Claim 13
Dependent Claim
37 words
A band conversion system according to claim 5, in which the memory means comprises a memory capable of performing writing and reading of a signal at a speed corresponding to the period of the supplied clock pulses.
Claim 14
Dependent Claim
49 words
A band conversion system according to claim 5, in which the memory means comprises series connected two memory means having the memory capacities capable of storing a signal of n lines of (2n + 1) scanning lines constituting one frame and a signal of (n +1) lines thereof, respectively.
Claim 15
Dependent Claim
226 words
A stationary color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: memory means including means for generating clock pulses whose frequency can be varied, and a memory device having a memory capacity capable of storing a picture signal of one frame and capable of performing writing and reading of a signal at a speed corresponding to the frequency of the clock pulses; means for switching two input signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; and means for reading the signals written in the memory means at a speed lower than the writing speed to output them.
Claim 16
Dependent Claim
226 words
A stationary color picture signal band conversion system for converting a simultaneous color picture signal of a wide band into a field sequential color picture signal of a narrow band, comprising: memory means including means for generating clock pulses whose frequency can be varied, and a memory device having a memory capacity capable of storing a picture signal of one frame and capable of performing writing and reading of a signal at a speed corresponding to the frequency of the clock pulses; means for switching two input signals at every field period to selectively output them; means for extracting a signal of one frame of a color picture signal consisting of a luminance signal and two kinds of chrominance signals; means for supplying the two kinds of chrominance signals of the one frame of color picture signal extracted by the extracting means to the switching means and for writing one chrominance signal selected at one of the two field periods constituting the one frame together with the luminance signal at this field period in the memory means; means for writing the other chrominance signal selected at the other field period together with the luminance signal at the latter field period in the memory means; and means for reading the signals written in the memory means at a speed lower than the writing speed to output them.
Claim 17
Dependent Claim
238 words
A stationary color picture signal band conversion system for converting a field sequential color picture signal of a narrow band into a simultaneous color picture signal of a wide band, comprising: memory means with two output terminals including a first memory device having memory capacity capable of storing a picture signal of one field, and capable of varying the writing speed and the reading speed, a second memory device having a memory capacity capable of storing a picture signal of one field, and capable of varying the writing speed and the reading speed, means for connecting the output terminal of said first memory device to the input terminal of said second memory device, means for supplying the read-out signal of said second memory device to the input terminal of said first memory device upon completion of the writing, and means for outputting the read-out signals simultaneously from the output terminals of said first and second memory devices; means for writing one frame signal of the picture signal of the narrow band in the memory means at a low speed corresponding to the transmission speed of the picture signal; and means for repeatedly reading, upon completion of the writing, the content of the memory means at a high speed corresponding to the signal of the wide band to simultaneously provide chrominance signals at the two output terminals and to provide a luminance signal at one of the output terminals.
Claim 18
Dependent Claim
238 words
A stationary color picture signal band conversion system for converting a field sequential color picture signal of a narrow band into a simultaneous color picture signal of a wide band, comprising: memory means with two output terminals including a first memory device having memory capacity capable of storing a picture signal of one field, and capable of varying the writing speed and the reading speed, a second memory device having a memory capacity capable of storing a picture signal of one field, and capable of varying the writing speed and the reading speed, means for connecting the output terminal of said first memory device to the input terminal of said second memory device, means for supplying the read-out signal of said second memory device to the input terminal of said first memory device upon completion of the writing, and means for outputting the read-out signals simultaneously from the output terminals of said first and second memory devices; means for writing one frame signal of the picture signal of the narrow band in the memory means at a low speed corresponding to the transmission speed of the picture signal; and means for repeatedly reading, upon completion of the writing, the content of the memory means at a high speed corresponding to the signal of the wide band to simultaneously provide chrominance signals at the two output terminals and to provide a luminance signal at one of the output terminals.
References Cited (Backward Citations)
US3553356A
Cited
US3598904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |