Ricoh Company, Ltd.

Eiichi Maeda

Masafumi Tanaka

Koubun Sakagami

Norihiro Sakaguchi

Fujiaki Narita

A video image and audio sound signal processor having a signal multiplexer and a single data compression system for a video image recording and playback apparatus. An audio sound signal is sampled in accordance with a timing signal in synchronism with a horizontal synchronizing signal of a video image signal, and such a sampled audio sound signal is then multiplexed onto an end of the video image signal, which is then converted into a digital signal by a single A/D (analog to digital) converter. Such a multiplexed digital signal containing video image data and audio sound data is then sent to a data converter wherein raster data are converted into a plurality of data blocks, each of such data blocks including a plurality of picture elements in both horizontal and vertical directions. And then, the data blocks are sent to a single compression device.

Video image and audio sound signal processor having signal multiplexer

An electronic camera includes an image converting device, a voice converting device, an image data compressing and expanding device, a voice data compressing and expanding device, a single digital/analog converter, a sample-holding device for sample-holding and outputting the analog sound signals, a pedestal level generating device for generating signals indicative of pedestal levels, a change-over switching device for connecting the voice data compressing and expanding device to the sample-holding means when causing the pedestal level generating device to output the signals indicative of pedestal levels and for connecting the image data compressing and expanding device to the single digital/analog converter when causing the pedestal level generating device to prevent the outputting of the signals indicative of the pedestal level.

Electronic camera for photographing and recording an image and for

A digital electronic camera apparatus which features an image pickup for picking up an image optically and converting the picked up optical image to an analog signal. An analog/digital converter converts the analog signal to a digital signal, and a digital processor converts the digital signal to a luminance signal and color difference signals. A first memory stores a frame of the luminance signal and the color difference signals, or a frame of the digital signal output from the analog/digital converter. A second memory stores n, where n is an integer, lines of the luminance signal and the color difference signals. A third memory stores a block n.times.n signal from the luminance signal and the color difference signals which are in the line memory, or which are output from the digital processor means. A compressing circuit compresses the signal from the third memory. A recording device records the signal from the compressing circuit in a recording media. In accordance with the present invention, a digital electronic camera apparatus which compresses a video signal and records a greater amount of the video signal in a recording media in case of motion video and still video can be achieved.

Digital electronic camera apparatus for recording still video images and

A digital video camera including an image sensor, comprises a line memory, unit for storing a plurality of digitized raster scanning data transferred from the image sensor, and a processing unit for reading out a plurality of data in the form of block or matrix from the line memory means and converting the data into luminance data and color-difference data every block or matrix.

Digital video camera

An image data processing apparatus includes a converter for subjecting each block to a discrete cosine transform (DCT) to convert blocks into DCT coefficients, a first memory for temporarily storing the DCT coefficients, a second memory for storing threshold values of a quantization matrix which is used for quantizing the DCT coefficients, a quantizing part for quantizing the DCT coefficients, a differential part for obtaining a difference in D.C. components of quantized DCT coefficients related to present and previous blocks, a zero detector for detecting whether or not A.C. components of the quantized DCT coefficient are zero coefficients, a counter for counting a number of successive zero coefficients of the A.C. components, a coder for subjecting the D.C. and A.C. components to a Huffman coding to output a coded D.C. and A.C. components, a first register for storing an address of an arbitrary DCT coefficient, a comparator for comparing an address where the DCT coefficient is stored in the first memory and the address in the first register, and a second register for holding the DCT coefficient output from the converter when the two compared addresses match.

Image data processing apparatus

A data insertion device for a recording and reproducing apparatus, which is for example with a video tape recorder (VTR) or the like, which allows one to insert data into a video tape or like recording medium while maintaining the VTR in a playback mode. While sync signals from the VTR are disturbed in the event of insertion of the search data and others, as distinguished from ordinary video data, sync signals provided by sync signal output means which is independent of sync signals provided by the VTR are used as sync signals for the insertion of the search data and others.

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Kawasaki, Japan

Eiichi Maeda