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    • 1. 发明公开
    • Discrete cosine transform processor
    • Rechnerfürdie discrete Cosinus-Transformation。
    • EP0655694A2
    • 1995-05-31
    • EP94118862.5
    • 1994-11-30
    • KABUSHIKI KAISHA TOSHIBA
    • Kim, Lee-SupNagamatsu, TetsuSakurai, Takayasu
    • G06F17/14
    • G06F17/147G06T9/007
    • Disclosed is an improved discrete cosine transform processor comprising an input unit for receiving image date to be processed, a storage unit for previously storing a result of a multiplication and accumulation calculation effected beforehand with respect to image input data and transform matrix components so that the same value is read from the same read line; a decoding unit for selecting the read line, in which each bit value of the image input data composed of a plurality of bits serves as a piece of address data; an accumulation unit for accumulating the data read from the storage unit and an output unit for outputting a result of the accumulation processing as output data. The storage unit uses the common data in common when effecting the multiplication and accumulation calculation, and, hence, a storage capacity is reduced, thereby making it possible to decrease a chip area.
    • 公开了一种改进的离散余弦变换处理器,包括用于接收要处理的图像日期的输入单元,用于预先存储关于图像输入数据和变换矩阵分量预先实现的乘法和累加计算的结果的存储单元,使得相同 值从相同的读取行读取; 用于选择读取行的解码单元,其中由多个位组成的图像输入数据的每个位值用作一段地址数据; 用于累积从存储单元读取的数据的累加单元和用于输出积累处理结果作为输出数据的输出单元。 存储单元在进行乘法运算和累计运算时,共同使用公用数据,因此能够减小存储容量,从而能够减小芯片面积。
    • 2. 发明公开
    • Discrete cosine transform processor
    • 变换计算器离散余弦。
    • EP0650128A3
    • 1995-06-07
    • EP94116934.4
    • 1994-10-26
    • KABUSHIKI KAISHA TOSHIBA
    • Nagamatsu, TetsuKim, Lee-Sup
    • G06F17/14
    • G06F17/147
    • A discrete cosine transform processor for executing discrete cosine transform calculations in both forward and inverse directions on the basis of previously stored product addition data has a memory having a first memory section (6a) for storing product addition calculation data for the forward direction transformation and a second memory section (6a) for storing product addition calculation data for the inverse direction transformation other than data in common to those stored in the first memory section; and sign inverter (7) for inverting signs of the data used in common for the inverse direction transformation, among the data stored in the first memory section. The memory preferably includes first memory for storing product addition data corresponding to even-order coefficients and second memory for storing product addition data corresponding to odd-order coefficients; and only the second memory stores data used in common for both the forward and inverse direction transformations in the first memory thereof.
    • 7. 发明公开
    • Driver circuit device
    • Treiberschaltungsvorrichtung
    • EP0788059A1
    • 1997-08-06
    • EP97101502.9
    • 1997-01-30
    • KABUSHIKI KAISHA TOSHIBA
    • Nagamatsu, TetsuKuroda, Tadahiro
    • G06F13/40
    • H04L25/0292G06F13/4072H04L25/0272H04L25/028Y02D10/14Y02D10/151
    • In the constant current drive type driver used for an LVDS (low voltage differential signal) interface, the parasitic capacitance of the package pins is charged and discharged sufficiently at a high speed to secure the high speed signal transmission operation. Further, the AC differential amplitude large enough to be received by the receiver can be obtained. The driver circuit device comprises: a transmit circuit composed of transistors (52, 53, 56, 57) for transmitting a signal by switching the signal current direction flowing through a pair of transmission lines (8, 9) connected between two output terminals (13 and 13B); and a constant current source composed of transistors (54, 75) for controlling the current value of the transmit circuit. In the idle state, only one of the two transistors (54 and 75) of the constant current source is turned on to limit the signal current flowing through the output terminals (13 and 13B). On the other hand, in the high speed signal transmission, both the transistors (54, 75) are turned on to increase the signal current flowing through the output terminals (13, 13B) to obtain a signal current of high DC LVDS level.
    • 在用于LVDS(低电压差分信号)接口的恒流驱动型驱动器中,封装引脚的寄生电容以高速充分充放电以确保高速信号传输操作。 此外,可以获得足够大以由接收器接收的AC差分幅度。 驱动器电路装置包括:由晶体管(52,53,56,57)组成的发送电路,用于通过切换流过连接在两个输出端子(13)之间的一对传输线(8,9)的信号电流方向来发送信号 和13B); 以及由用于控制发射电路的电流值的晶体管(54,75)组成的恒流源。 在空闲状态下,恒流源的两个晶体管(54和75)中只有一个导通,以限制流过输出端子(13和13B)的信号电流。 另一方面,在高速信号传输中,两个晶体管(54,75)导通,以增加流过输出端子(13,13b)的信号电流,以获得高DC LVDS电平的信号电流。