Matsushita Electric Industrial Co., Ltd.

Ryuji Matsuura

Hiroki Monta

Tokuzo Kiyohara

Hideshi Nishida

Yutaka Nio

Kozo Kimura

Hiroyuki Morishita

Toshiaki Tsuji

Makoto Hirai

Kosuke Yoshioka

Kiyoshi Imai

Takashi Yamaguchi

Toyohiko Matsuta

Hisashi Arita

Hiroyuki Oka

Taku Takada

A pixel calculating device that performs vertical filtering on pixel data in order to reduce frame data in a vertical direction. The pixel calculating device includes a decoding unit for decoding compressed video data to produce frame data, frame memory for storing the frame data, a filtering unit for reducing the frame data in a vertical direction by the vertical filtering to produce a reduced image, buffer memory for storing the reduced image outputted from filtering unit , and a control unit for controlling filtering unit based on a decoding state of the video data by decoding unit and a filtering state of the frame data by filtering unit , so that overrun and underrun do not occur in filtering unit

Pixel calculating device

A pixel calculating device for performing vertical filtering that includes 16 pixel processing units 1 to 16 and an input buffer group storing 16 pieces of pixel data and filter coefficients. Each of the pixel processing units performs operations using the pixel data and a filter coefficient supplied from input buffer group , and then acquires pixel data from an adjacent pixel processing unit. Further operations are performed by each of the pixel processing units using the acquired pixel data and operation results are accumulated. Filtering is carried out through a repetition of this acquiring and accumulation process, the number of taps being determined by the number of repetitions.

A receiver to receive a mixture of progressive and interlace video broadcast signals without being conscious of switching between the broadcasting systems. The receiver receives the mixed video broadcast signals having different formats, converts received video signals to video signals having a different signal format from the signal format of the received video signals. The receiver simultaneously outputs the received video signals and the converted video signals. This allows the user to be unaware of any switching when the video input changes between the different broadcasting systems, by connecting a television set to either the interlace scanning system output or the progressive scanning system output of the receiver.

Receiver

A scan converting apparatus receives an NTSC signal which is scan converted and which has a changed aspect ratio. The subtitle domain, which is vertically overscaned out of the screen and cannot be observed, is extracted and superimposed on the scan converted image. Scanning lines of a brightness output signal of a brightness/chrominance signal separator are interpolated at a scanning line interpolator and are converted to a system which has more scanning lines at a scanning line converter. An odd/even field discriminator prevents deterioration of the resolution of the subtitle letters which is caused by an interchange of the positions between two adjacent scanning lines when the subtitle is transferred to a different field. By stopping the writing of data to a field memory in the subtitle signal processor when a subtitle is transferred, a subtitle transfer can be accomplished even when there is no subtitle on the image.

Scan converting apparatus for transferring subtitles on a screen

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.

TV signal decoding apparatus using luminance and color signal selection

A double-picture type television receiver for displaying two different pictures on its screen. The television receiver is equipped with an image memory having a capacity required for storing a child picture signal to be inputted, the child picture signal to be stored being for one picture and a line memory coupled in series to an output of the image memory. Also included are multipliers, one being directly coupled to the output of the image memory for multiplying the output of the image memory by a predetermined coefficient and the other being coupled to outputs of the line memory for multiplying the outputs of the line memory by a predetermined coefficient. An adder calculates the sum of outputs of the multipliers and outputs the sum signal as a child picture signal. A switching device is responsive to a parent picture signal inputted from an external circuit and further to the output of the adder for performing a switching operation between the parent picture signal and the output of the adder with respect to a display device.

Double-picture type television receiver

In an image display apparatus including a display unit for displaying an image of an inputted video signal thereon with a predetermined field frequency and a predetermined number of scanning lines using vertical and horizontal synchronizing signals for deflection of display in response to the inputted video signal, a first converter converts an inputted first video signal, having a first field frequency which is lower than the predetermined field frequency and having the predetermined number of scanning lines, into an output second video signal having the predetermined field frequency which is and the predetermined number of scanning lines, and having outputs the output second video signal to the display unit. Further, a second convertor converts an inputted third video signal, having a first number of scanning lines which is smaller than the predetermined number of scanning lines and having the predetermined field frequency into an output fourth video signal having the predetermined field frequency and the predetermined number of scanning lines, and outputs the output fourth video signal to the display unit.

Image display apparatus for displaying images of plurality of kinds of

An image signal magnifying apparatus is provided with a subtitle processing circuit capable of automatically detecting subtitles and moving the detected subtitle to a lower portion of a picture screen of an image display unit, when an image signal of a movie or the like, displayed on a picture screen having an aspect ratio of 4 to 3, is magnified to a picture screen having an aspect ratio of 16 to 9. Improvement of image quality of the characters of the subtitles after magnification of the image and simplification of the subtitle processing operation are attained. An output of a subtitle processing circuit 6 and an output of a number-of-scanning-line conversion circuit 9 are combined by a combining circuit 8. The image signal magnified by the number-of-scanning-line conversion circuit 9 and a subtitle processing signal, which is not subjected to conversion of the number of scanning lines are combined, so that the image quality of the characters of the subtitle, in the case where the image is magnified, can be improved. Further, a control signal establishing circuit 7, for automatically generating control signals required for the subtitle processing operation is provided, so that simplification of the subtitle processing operation can be attained.

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Neyagawa, Japan

Ryuji Matsuura