 Circuit arrangement for the equalization of digital signals received in analog form |
| A digital subscriber line system illustrated in FIG. 1 could be designed, for example, for the ... |
|
| Data recording apparatus |
| It is an object of the present invention to provide a data recording apparatus which can solve the ... |
|
| Digital transmission signal processing system and recording/reproducing system |
| An object of the present invention is to provide a digital VTR in which high-speed recording onto a ... |
|
| Video signal processing apparatus |
| As described, when a configuration in which both analog and digital recording/reproducing ... |
|
| Continuous looping feature in transmission of HDTV signals |
| The invention resides in a continuous looping play feature in a high definition TV player capable ... |
|
| Image input device |
| The present invention has been made in view of the above-noted points and an object thereof is to ... |
|
| Method and system for first-order RF amplitude and bias control of a modulator |
| Therefore, a need exists for a method and system for controlling the RF amplitude and bias value of ... |
|
| Apparatus for recording and/or reproducing color video signals |
| Accordingly, it is an object of this invention to provide an apparatus for recording and/or ... |
|
| Method and system for producing personal golf lesson video |
| It is an object of the present invention to solve the problems described above associated with ... |
|
|
TV signal decoding apparatus using luminance and color signal selection
| Details |
Inventors: Nio, Yutaka; Matsuura, Ryuji;
Assignee: Matsushita Electric Industrial Co., Ltd. (Kadoma, JP)
Primary Examiner: Groody; James J.
Assistant Examiner: West; Nina N.
Attorney, Agent or Firm: Ratner & Prestia
The object of the present invention is to use signal decoding circuits for a first generation EDTV signal and a second generation EDTV signal in common and to suppress an increase of circuit scale. An EDTV signal decoding apparatus of the present invention is constructed with a cascade connection of a first A/D converter, a first signal processing circuit, a first D/A converter, a second A/D converter, a second signal processing circuit and a second D/A converter. The first group composed of the first A/D converter, the first signal processing circuit and the first D/A converter are driven by a clock signal synchronizing with a color burst signal. The second group composed of the second A/D converter, the second signal processing circuit and the second D/A converter are driven by a clock signal synchronizing with a horizontal sync signal. At the first signal processing circuit, a composite video signal is inputted and when a signal discrimination and control circuit judges that a vertical high frequency band helper signal is not multiplexed in upper/lower non-picture periods with the input signal or a vertical high frequency band helper signal is multiplexed in upper/lower non-picture periods but the input signal is in a picture period, a demodulator input signal selector, a luminance signal output selector and I and Q signal output selectors are controlled to be the upper positions and a chrominance signal separated at a three dimensional adaptive type Y/C separator is demodulated at a color demodulator. A luminance signal separated at the three dimensional adaptive type Y/C separator is outputted from a luminance signal output terminal and color signals I and Q demodulated at the color demodulator are outputted from I and Q signal output terminals, respectively. |
|
DETAILED DESCRIPTION To solve the above problems, the present invention offers an EDTV signal decoding apparatus which is common for a first and a second generation EDTV systems and can suppress an increase of a circuit scale and power consumption by simplifying a configuration of a second generation EDTV signal decoding apparatus and by using a part of circuits for regenerating helper signals peculiar to the second generation EDTV system and that of the first generation EDTV system in common or by selecting an additional circuit.
An EDTV signal decoding apparatus in accordance with an exemplary embodiment of the present invention uses a color demodulator and a demodulator for a vertical high frequency band helper signal in common and includes an input signal selector for a demodulator controlled by what kind of signal the input signal is and in which period the input signal is a picture period or upper/lower non-picture periods, and an output signal selector for a luminance signal output and a color signal controlled by what kind of signal the input signal is and in which period the input signal is a picture period or upper/lower non-picture periods.
In an EDTV signal decoding apparatus in accordance with an exemplary embodiment of the present invention, video processing such as three dimensional adaptive type Y/C separation, separation between a horizontal high frequency band helper signal and a chrominance signal (F/C separation), demodulation of a horizontal high frequency band helper signal, restoration of a horizontal high frequency band signal on the luminance signal, color demodulation, and demodulation of a helper signal multiplexed during upper/lower non-picture periods is executed by a clock signal synchronizing with a color burst signal.
Processing such as threefold expansion (at time base) of a demodulated vertical high frequency band helper signal (VH signal) multiplexed during upper/lower non-picture periods, separation between an interpolating line helper signal and a vertical high frequency band helper signal, scanning line interpolation, addition of a vertical high frequency band helper signal (VH signal), and vertical expansion (interpolation of scanning lines during a picture period) is executed by a clock signal synchronizing with a horizontal sync signal
|
| Related patents |
|
|
Low cost high efficiency power converter
A new circuit for switch mode power converters achieves high efficiency and zero voltage switching by using an auxiliary switch, a capacitor, an auxiliary winding and an ...
|
|
|
Television camera arrangement in which electrically generated data is superimposed on the video picture information
We claim: 1. A television camera arrangement wherein in order to provide in the video signal output thereof character or symbol information, accommodation is provided ...
|
|
|
Multi-channel video switch using dual-gate MOS-FETS
In accordance with the present invention a video switch circuit provides alternate connection of two separate video signal paths to a third video signal path using a ...
|
|
|
Television generator for highlighting portions of an image
As described above, according to the prior art, hardware is increased in volume and high-speed operation cannot be performed. It is an object of the present invention to ...
|
|
|
Holograms for security markings
According to a first aspect of this invention there is provided a hologram for security markings comprising a laser transmission hologram known per se formed as a ...
|
|
|
Chrominance signal processing circuit in color television receiver
Briefly described, the present invention comprises a chrominance signal processing circuit in a color television receiver, comprising bandpass amplifying means of a ...
|
|
|
Method of and apparatus for producing hard copy of color picture adaptive to variations in characteristics of fluorescent screen of recorder CRT
It is therefore an object of the present invention to provide a method and apparatus for producing a hard copy of a color picture which is capable of reproducing a color ...
|
|
|
Image recording apparatus
I claim: 1. An image recording apparatus comprising: a raster scan display screen for displaying an image defined by electronic data, the display screen being arranged ...
|
|
|
FM demodulator having a frequency independent delay circuit
An object of the present invention is to provide an FM demodulator, employing delay circuits, which has an improved demodulation output response characteristic. Another ...
|
|
|
Apparatus for recording and reproducing a video signal
Accordingly, it is an object of the present invention to provide an apparatus for recording and reproducing a video signal which avoids the above-mentioned disadvantages ...
|
|
|
TV Signal 
