EP0512626A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Recording and reproduction of an extended definition video signal
Assignee: Koninklijke Philips NV
•
Filing: 1992-05-04
•
Granted: —
•
Expires: 2012-05-04
Abstract
Abstract A description is given of a system for recording and reproducing a signal of an extended aspect ratio with a magnetic record carrier. An ED video signal, such as a PAL-PLUS video signal, comprises first lines having a first luminance signal (Y₁) and a chrominance signal (C), and second lines comprising no chrominance signal but a second luminance signal (Y₂) in the form of a modulated luminance signal with suppressed carrier. The recording device in the system comprises a first signal path (11,31,32,15) for processing the first luminance signal, a second signal path (11,33,34,17) for processing the chrominance signal and a third signal path (30,32,15) for processing the second luminance signal prior to the three signals being combined (22) and recorded on the record carrier. The reproducing device in the system also includes a first (48,50) a second (51,52,53) and a third signal path (48,73,83) for processing the first luminance signal, the chrominance signal and the second luminance signal respectively. Furthermore, converter means are described with which an ED video signal may be converted to a signal that may be recorded by an SD video recorder and with which a signal read out by an SD video recorder may be converted to an ED video signal. The SD video recorder might be a digital video recorder and comprise DCT coding and decoding.
Inventors
- 👤 Franciscus Herman Maria Bergen
- 👤 Jan Jacobus Rotte
- 👤 Stephanus Joseph Johannes Nijssen
- 👤 Peter Hendrik Nelis De With
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:21
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/007; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N9/00; H04N9/79; H04N9/7921; H04N9/7925; H04N9/797; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N9/82; H04N9/83; H04N9/832; H04N11/00; H04N11/06; H04N11/12; H04N11/14; H04N11/16; H04N11/167; H04N9/87; H04N9/8722
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
495 words
System for recording and reproducing a standard definition (SD) video signal in/from a track on a magnetic record carrier, comprising a recording device which includes - an input terminal for receiving the SD video signal, - a separation unit having an input coupled to the input terminal, and first and second outputs, which separation unit is arranged for deriving a luminance signal from the SD video signal and presenting this luminance signal at the first output, and for deriving a chrominance signal and presenting same at the second output, - a first signal path comprising an FM modulator, - a second signal path, comprising a mixer stage, - a signal combining unit having first and second inputs coupled to an output of the respective first and second signal paths, and an output, - writing means having an input coupled to the output of the signal combining unit, the system further including a reproducing device which comprises - reading means having an output, - a separation unit having an input coupled to the output of the reading means, first and second outputs, which separation unit is arranged for deriving an FM-modulated luminance signal from the signal read from the track by the reading means and presenting this luminance signal at the first output, and deriving a frequency-converted chrominance signal and presenting same at the second output, - a first signal path including an FM demodulator, - a second signal path including a mixer stage, - a first output terminal coupled to an output of the first signal path, for presenting the demodulated luminance signal, - a second output terminal coupled to an output of the second signal path, for applying the frequency-shifted chrominance signal, characterized in that the system is arranged for recording an extended definition (ED) video signal in the form of pictures, each picture comprising first lines having a chrominance signal and a first luminance signal and second lines comprising a second luminance signal modulated with a suppressed carrier, in that the system is arranged for reproducing the recorded ED video signal, in that the recording device thereto comprises a third signal path having an output coupled to a third input of the signal combining unit and comprises supply means having an input coupled to the input terminal and an output coupled to the input of the third signal path, which supply means are arranged for supplying the second luminance signal in the second lines to the input of the third signal path, in that the reproducing device thereto comprises a third signal path having an output coupled to a third output terminal for supplying the second luminance signal, in that the signal path leading from the input terminal of the recording device to the third output terminal of the reproducing device via the third signal paths in these devices comprises at least a first mixer stage, in that this mixer stage is arranged for shifting the frequency spectrum of the second luminance signal.
Claim 2
Dependent Claim
36 words
System as claimed in Claim 1, characterized in that the signal path comprises a second mixer stage and in that at least one mixer stage is located in the third signal path in the reproducing device.
Claim 3
Dependent Claim
21 words
Recording device as defined by the features characterizing the recording device of the system as claimed in Claim 1 or 2.
Claim 4
Dependent Claim
18 words
Recording device as claimed in Claim 3, characterized in that the third signal path comprises an FM modulator.
Claim 5
Dependent Claim
32 words
Recording device as claimed in Claim 4, characterized in that the modulator in the first and third signal paths is the same FM modulator which is shared by the two signal paths.
Claim 6
Dependent Claim
35 words
Recording device as claimed in Claim 3, 4 or 5, characterized in that the first mixer stage arranged for shifting the frequency spectrum of the second luminance signal is located in the third signal path.
Claim 7
Dependent Claim
39 words
Recording device as claimed in Claim 6, characterized in that the mixer stage in the second signal path and the first mixer stage in the third signal path is the same mixer stage shared by the two signal paths.
Claim 8
Dependent Claim
130 words
Recording device as claimed in Claim 5, or 6 insofar as dependent on Claim 5, characterized in that the supply means comprise first controllable switching means having first and second inputs coupled to the input terminal and the first output of the separation unit respectively, and an output coupled to the input of the first signal path, and in that the first switching means are arranged for connecting, in response to a control signal, the first input to the output at least during the presence of the second luminance signal in the second lines in the ED video signal, and for connecting the second input to the output at least during the presence of the first luminance signal present in the first lines in the ED video signal (Figs. 3,7).
Claim 9
Dependent Claim
120 words
Recording device as claimed in Claim 8, characterized in that the second lines in the ED video signal furthermore comprise a burst, in that the device comprises second switching means having an input coupled to the second output of the separation unit and an output coupled to the input of the second signal path, and in that the second switching means are arranged for connecting, in response to the control signal, the input to the output during the first lines and during the presence of the burst in the second lines in the ED video signal, and for interrupting the connection between the input and output during the presence of the second luminance signal in the second lines. (Fig. 3).
Claim 10
Dependent Claim
155 words
Recording device as claimed in Claim 8, characterized in that the device comprises second controllable switching means having first and second inputs and an output, in that the output of the first switching means is coupled to the first input of the second switching means and an input of the first mixer stage, in that an output of the first mixer stage is coupled to the second input of the second switching means, the output of the second switching means being coupled to the input of the FM modulator, in that the second switching means are arranged for connecting, in response to the control signal, the second input to the output at least during the presence of the second luminance signal in the second lines in the ED video signal, and for connecting the first input to the output at least during the presence of the first luminance signal in the first lines. (Fig. 7).
Claim 11
Dependent Claim
230 words
Recording device as claimed in Claims 5 and 7, characterized in that the supply means comprise first switching means having first and second inputs coupled to the input terminal and second output of the separation unit respectively, and an output coupled to the input of the mixer stage in the second signal path, in that the device further includes second switching means having first and second inputs coupled to the first output of the separation unit and the output of the mixer stage respectively, and an output coupled to the input of the FM modulator in the first signal path, in that the first switching means are arranged for connecting, in response to a control signal, the first input to the output at least during the presence of the second luminance signal in the second lines in the ED video signal, and for connecting the second input to the output at least during the presence of the chrominance signal in the first lines in the ED video signal, and in that the second switching means are arranged for connecting, in response to the control signal, the second input to the output at least during the presence of the second luminance signal in the second lines, and for connecting the first input to the output at least during the presence of the first luminance signal in the first lines. (Fig. 5).
Claim 12
Dependent Claim
85 words
Recording device as claimed in Claim 11, characterized in that third controllable switching means are inserted between the output of the mixer stage and the second input of the signal combining unit, and in that the third switching means are arranged for interrupting, in response to the control signal, a connection between the output of the mixer stage and the second input of the signal combining unit during the presence of the second luminance signal in the second lines in the video signal. (Fig. 5).
Claim 13
Dependent Claim
160 words
Recording device as claimed in Claim 6, insofar as dependent on Claim 3, in which the mixer stage in the second signal path and the first mixer stage in the third signal path is the same mixer stage shared by the two signal paths, characterized in that the supply means comprise first controllable switching means having first and second inputs coupled to the input terminal and the second output of the separation unit respectively, and an output coupled to the input of the mixer stage in the second signal path, and in that the first switching means are arranged for connecting, in response to the control signal, the first input to the output at least during the presence of the second luminance signal in the second lines in the ED video signal, and for connecting the second input to the output at least during the presence of the chrominance signal present in the first lines in this signal. (Fig. 9).
Claim 14
Dependent Claim
78 words
Recording device as claimed in Claim 13, in which a low-pass filter is inserted in the second signal path between the mixer stage and the second input of the signal combining unit, characterized in that the device further includes switching means for switching off, in response to the control signal, the filter operation in the low-pass filter at least during the presence of the second luminance signal in the second lines in the ED video signal. (Fig. 9).
Claim 15
Dependent Claim
20 words
Reproducing device as defined by the features characterizing the reproducing device of the system claimed in Claim 1 or 2.
Claim 16
Dependent Claim
18 words
Reproducing device as claimed in Claim 15, characterized in that the third signal path comprises an FM demodulator.
Claim 17
Dependent Claim
30 words
Reproducing device as claimed in Claim 16, characterized in that the demodulator in the first and third signal paths is the same FM demodulator shared by the two signal paths.
Claim 18
Dependent Claim
34 words
Reproducing device as claimed in Claim 16 or 17, characterized in that the first mixer stage arranged for shifting the frequency spectrum of the second luminance signal is located in the third signal path.
Claim 19
Dependent Claim
42 words
Reproducing device as claimed in Claim 15, 16, 17 or 18, characterized in that the mixer stage in the second signal path and a mixer stage in the third signal path are the same mixer stage shared by the two signal paths.
Claim 20
Dependent Claim
55 words
Reproducing device as claimed in Claim 16, 17 or 18, characterized in that an output of the FM demodulator is coupled to a input of a mixer stage in the third signal path, an output of which being coupled to the third output terminal for presenting the second luminance signal modulated with a suppressed carrier.
Claim 21
Dependent Claim
109 words
Reproducing device as claimed in Claim 20, characterized in that the output of the mixer stage in the third signal path is coupled to a first input of a phase comparator, an output of which being coupled through a low-pass filter to a control signal input of a voltage-controlled oscillator whose output is coupled to a first input of a third mixer stage, in that an output of the third mixer stage is coupled to a second input of the mixer stage in the third signal path, an output of a fixed oscillator being coupled to a second input of both the phase comparator and the third mixer stage.
Claim 22
Dependent Claim
93 words
Reproducing device as claimed in Claim 21, characterized in that the mixer stage in the third signal path is the first mixer stage, in that the output of the first mixer stage is coupled to a first input of the second mixer stage in the third signal path, an output of which being coupled both to the third output terminal and to the first input of the phase comparator, and in that the output of the fixed oscillator is coupled through a frequency multiplier to a second input of the second mixer stage.
Claim 23
Dependent Claim
134 words
Reproducing device as claimed in Claim 21, characterized in that the mixer stage in the third signal path is the second mixer stage, in that the second mixer stage in the third signal path and the mixer stage in the second signal path are the same mixer stage, in that the device further includes first controllable switching means having first and second inputs coupled to the output of the FM demodulator and the second output of the separation unit respectively, and an output coupled to the input of the shared mixer stage, and in that the first switching means are arranged for connecting, in response to the control signal, the first input to the output at least during the presence of the second luminance signal in the second lines in the ED video signal.
Claim 24
Dependent Claim
93 words
Reproducing device as claimed in Claim 19, insofar as dependent on Claim 15, said mixer stage being the second mixer stage in the third signal path, characterized in that the separation unit comprises a separation filter coupled between the input and the second output, and in that the separation unit further includes means for switching off, in response to a control signal, the filter operation in the low-pass filter at least during the presence of the second luminance signal in the second lines in the input signal of the separation unit (Fig. 10).
Claim 25
Dependent Claim
270 words
Converter means for converting an ED video signal to a video signal that may be recorded on a video recorder, comprising an input terminal for receiving the ED video signal, the ED video signal being in the form of pictures, each picture comprising first lines having a chrominance signal and a first luminance signal and second lines comprising a second luminance signal modulated with a suppressed carrier, characterized in that the converter means comprises - a separation unit having an input coupled to the input terminal, and having first, second and third outputs, which separation unit is arranged for deriving from the ED video signal and presenting at the first output the first luminance signal in the first lines of the ED video signal, is arranged for deriving and presenting at the second output the chrominance signal in the first lines of the ED video signal, and is arranged for deriving and presenting at the third output the second luminance signal in the second lines of the video signal, that a mixer stage is inserted between the third output of the separation unit and a first input of a signal combination unit, the signal combination unit having a second input coupled to the first output of the separation unit, and having an output coupled to a first output terminal of the converter means, in that the signal combination unit is arranged for supplying the first luminance signal in the first lines of the ED video signal and the second luminance signal in the second lines in the ED video signal, mixed in the mixer, to its output. (fig. 13, 20).
Claim 26
Dependent Claim
55 words
Converter means as claimed in Claim 25, characterized in that for presenting the second luminance signal at the third output, the separation unit is arranged for making a connection between the input and the third output at least during the presence of the second luminance signal in the second lines in the ED video signal.
Claim 27
Dependent Claim
182 words
Converter means for converting an ED video signal to a video signal that can be recorded on a video recorder, comprising an input terminal for receiving the ED video signal, the ED video signal being in the form of pictures, each picture comprising first lines having a chrominance signal and a first luminance signal and second lines comprising a second luminance signal modulated with a suppressed carrier, characterized in that the converter means comprise a mixer stage and a signal combination unit, in that the input terminal is coupled to the first input of the signal combination unit via the mixer stage, and, in addition, is coupled to the second input of the signal combination unit circumventing the mixer stage, in that the output of the signal combination circuit is coupled to the output terminal, in that the signal combination unit is arranged for supplying the first luminance signal in the first lines of the ED video signal and the second luminance signal in the second lines in the ED video signal, mixed in the mixer, to its output (fig. 11, 17).
Claim 28
Dependent Claim
39 words
Converter means as claimed in any one of the claims 25 to 27, characterized in that a signal adding circuit is included which is adapted to add a DC voltage to the second luminance signal in the second lines.
Claim 29
Dependent Claim
87 words
Converter means as claimed in Claim 25, 26, 27 or 28, characterized in that the signal combination unit is in the form of first controllable switching means, and in that the first switching means are arranged for connecting, in response to a control signal, the first input to the output at least during the presence of the second luminance signal in the second lines in the ED video signal, and for connecting the second input to the output during the first lines in the ED video signal.
Claim 30
Dependent Claim
92 words
Converter means as claimed in Claim 29, as far as dependent of Claim 25 or 26, characterized in that the converter means further include the second controllable switching means having an input coupled to the second output of the separation unit and an output coupled to the second output terminal of the converter means, and in that the second switching means are arranged for decoupling the input and output in response to the control signal during the presence of the second luminance signal in the second lines in the ED video signal.
Claim 31
Dependent Claim
208 words
Converter means for converting a video signal reproduced by a video recorder to a ED video signal, the ED video signal being in the form of pictures, each picture comprising first lines having a chrominance signal and a first luminance signal and second lines comprising a second luminance signal modulated with a suppressed carrier, comprising an input terminal for receiving a signal reproduced by the video recorder, and an output terminal for presenting at least the first and second luminance signals in the ED video signal, characterized in that the converter means comprises a mixer stage and a signal combination unit, in that the input terminal is coupled to a first input and via the mixer stage to the second input of the signal combination unit, an output of which being coupled to the output terminal, in that the signal combination unit is arranged for supplying the signal present at its first input to the output so as to obtain the first luminance signal in the first lines of the ED video signal, and for supplying the signal present at its second input to the output so as to obtain the second luminance signal in the second lines of the ED video signal (Figs. 12, 15, 18, 21).
Claim 32
Dependent Claim
33 words
Converter means as claimed in Claim 31, characterized in that a signal subtracting circuit is included which is adapted to subtract a DC voltage from the second luminance signal in the second lines.
Claim 33
Dependent Claim
80 words
Converter means as claimed in Claim 31 or 32, characterized in that the signal combination unit is in the form of controllable switching means, the switching means being arranged for connecting, in response to a control signal, the second input to the output at least during the presence of the second luminance signal in the second lines of the ED video signal, and for connecting the first input to the output during the first lines in the ED video signal.
Claim 34
Dependent Claim
168 words
Converter means for converting a video signal reproduced by a video recorder to an ED video signal, the ED video signal being in the form of pictures, each picture comprising first lines having a chrominance signal and a first luminance signal and second lines comprising a second luminance signal modulated with a suppressed carrier, comprising a first and a second input terminal, a first output terminal for presenting the first luminance signal and a second output terminal for presenting the second luminance signal and the chrominance signal, characterized in that the converter means comprises a mixer stage and a signal combination unit, in that the first input terminal is coupled to the first output terminal and to an input of the mixer stage, an output of the mixer stage being coupled to a first input of the signal combination unit, the second input terminal being coupled to the second input of the signal combination unit, an output of which is coupled to the second output terminal (figure 14).
Claim 35
Dependent Claim
84 words
Converter means as claimed in Claim 34, characterized in that the signal combination unit is in the form of switching means, and that the switching means are arranged for connecting the first input and the output in response to the control signal during the presence of the seocond luminance component in the second lines in the ED video signal, and for connecting the second input to the output during the first lines and the burst in the second lines in the ED video signal.
Claim 36
Dependent Claim
72 words
Converter means as claimed in Claim 34 or 35, characterized in that the converter means further includes second switching means having an input coupled to the first input terminal and an output coupled to the first output terminal, and that the second switching means are arranged for disconnecting the input from the output at least during the presence of the second luminance signal in the second lines in the ED video signal.
Claim 37
Dependent Claim
36 words
Record carrier obtained with the aid of the recording device as claimed in one of the Claims 3 to 14, characterized in that the ED video signal is recorded in a track on the record carrier.
Claim 38
Dependent Claim
19 words
Record carrier as claimed in Claim 37, characterized in that the ED video signal is a PAL-PLUS video signal.
Claim 39
Dependent Claim
24 words
Converter means as claimed in one of the Claims 25 to 36, characterized in that the ED video signal is a PAL-PLUS video signal.
Claim 40
Dependent Claim
24 words
Reproducing device as claimed in one of the Claims 15 to 24, characterized in that the ED video signal is a PAL-PLUS video signal.
Claim 41
Dependent Claim
24 words
Recording device as claimed in one of the Claims 3 to 14, characterized in that the ED video signal is a PAL-PLUS video signal.
Claim 42
Dependent Claim
20 words
System as claimed in Claim 1 or 2, characterized in that the ED video signal is a PAL-PLUS video signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.