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    • 1. 发明专利
    • DATA TRANSFER CIRCUIT
    • JPH03290749A
    • 1991-12-20
    • JP9166290
    • 1990-04-06
    • NIPPON TELEGRAPH & TELEPHONE
    • SUZUKI YUTAKATAKAHASHI TOSHIYUKI
    • G06F13/28
    • PURPOSE:To attain the transfer of data without stopping the working of an arithmetic circuit as much as possible for a digital signal processing circuit containing a memory and an arithmetic circuit set in parallel with each other by setting the transfer cycle number at 1/N on an internal data bus where N pieces of data are buffed by an input/output circuit. CONSTITUTION:An input/output circuit 2 is provided with registers 21 - 24 are performs the buffing operations between an input/output port 1 and the internal data buses 611 - 614. That is, four pieces of input data are stored in a data input state and the data are stored in all registers. At the same time, a queuing state is kept until the buses 611 - 614 become idle. In a data output state, the data sent from the buses 611 - 614 are stored and then outputted successively to an external memory, etc., through the port 1. Therefore the working cycle number of the internal data bus can be reduced down to 1/4 for transfer of data. Thus a memory and an arithmetic circuit are set in parallel with each other. Then the transfer cycle number is decreased in response to the parallel degree and the internal data buses are used by the arithmetic circuit.
    • 2. 发明专利
    • INTER-MULTI-POINT VIDEO COMMUNICATION SYSTEM
    • JPH031692A
    • 1991-01-08
    • JP13703689
    • 1989-05-29
    • NIPPON TELEGRAPH & TELEPHONE
    • SUZUKI YUTAKATAJIRI TETSUOTAKAHASHI TOSHIYUKI
    • H04N7/15
    • PURPOSE:To attain inter-multi-point communication using a video and audio signal without use of a central control unit by connecting an optional set among N-set of inter-multi-point video communication equipments directly to other two equipments and providing a signal synthesis means. CONSTITUTION:The communication from video communication equipment T1 to a video communication equipment T2, from video communication equipment T2 to a video communication equipment T3,..., from video communication equipment Tn-1 to a video communication equipment Tn, and from video communication equipment Tn to a video communication equipment T1 is attained in N-set (N is an integral number being 3 or over). Then the equipment T1 synthesizes the signal generated from its own equipment with a signal received by the equipment Tn and outputs the result to the equipment T2. The video communication is applied among 3 or over of points without interposing of the central controller and the utilizing efficiency of the multi-point communication line where the video communication equipments are interconnected is improved. Since no basic restriction to the number of equipments exists, communication is attained with an optional equipment number, then the communication cost of each equipment is constant independently of the number of equipments and the deterioration in the communication quality is minimized.
    • 4. 发明专利
    • DIGITAL PHASE SYNCHRONIZING CIRCUIT
    • JPH01194695A
    • 1989-08-04
    • JP1744488
    • 1988-01-29
    • NIPPON TELEGRAPH & TELEPHONE
    • KURODA HIDEOTSUCHIYA TOSHIOSUZUKI YUTAKATAJIRI TETSUOYANAKA KAZUHISATAKAHASHI TOSHIYUKI
    • H04N9/64H04N9/45H04N9/66H04N11/04
    • PURPOSE:To eliminate the limit of a sampling frequency and the unstability of a circuit by accumulating the basic address signal of a phase generating circuit for 2piXN/M every time a sampling clock T is increased by one and outputting the accumulation result. CONSTITUTION:A phase synchronizing circuit 100 pays attention to a color sub-carrier only out of the digitized NTSC signals which is the output of an A/D converting circuit 4, a phase comparator 101 compares the phase of the color sub-carrier with the output of a signal generating circuit 102 and a phase correcting quantity determining circuit 106 determines the phase correcting quantity for the phase synchronization. The signal generating circuit 102 generates the value of SINtheta.COStheta by the phase for respective sampling clocks (T) based on the output of a phase generating circuit 104 basicly, and is operated in accordance with the phase to correct the phase only by the value instructed by the phase correcting quantity determining circuit 106 for the output of a phase generating circuit 104, namely, the output of a phase correcting circuit 105. Namely, the expression is executed by a phase log2M bit of the color sub-carrier, N is accumulated at every sample, in short, the sampling clock of 13.5MHz and a lower order log2M bit the accumulation result becomes the output of the phase generating circuit 104.
    • 5. 发明专利
    • DIGITAL PICTURE SYNTHESIZING CIRCUIT
    • JPH0265389A
    • 1990-03-06
    • JP21765088
    • 1988-08-30
    • NIPPON TELEGRAPH & TELEPHONE
    • TAKAHASHI TOSHIYUKIKURODA HIDEO
    • H04N5/265H04N9/74
    • PURPOSE:To reduce the circuit scale of an LSI by modulating the color sub carrier of a phase, which is same as the color sub carrier of a digital NTSC signal for master picture, by a digital color difference signal for slave picture. CONSTITUTION:In a master picture constituting circuit 10, a modulating circuit 16 modulates the color sub carrier, which is generated in an internal part, by master picture digital color difference signals C1 and C2 which are respectively inputted from input terminals 12 and 13. Then, a carrier chrominance signal is outputted. A master picture digital luminance signal, which is inputted from an input terminal 11, and the above mentioned carrier chrominance signal are synthesized by a synthesizing circuit 17 and the digital NTSC signal for master picture is outputted from a terminal 51. On the other hand, the three signals of a slave picture digital luminance signal Y', which is inputted from an input terminal 21, and slave picture digital color difference signals C1' and C2', which are inputted from input terminals 22 and 23, are written to a frame memory 25.