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    • 51. 发明专利
    • JPH05268114A
    • 1993-10-15
    • JP6581692
    • 1992-03-24
    • H04B1/62H04B14/04H04J3/18
    • PURPOSE:To attain band compression while suppressing a high frequency band, that is, distortion at a high sound frequency by allowing a band compression section to receive a digital audio signal being an output of a de-emphasis section, to implement band compression by means of differential coding and to output the result. CONSTITUTION:The compressor is provided with a de-emphasis section 1 which receives a digital audio signal subject to emphasis in compliance with a determined standard and converts the input signal into a signal with a flat frequency characteristic with a so-called reverse operation as passing through a prescribed filter and with a band compression section 2 receiving the digital audio signal and implementing band compression through differential coding. Then the external digital audio signal subjected to emphasis from an upperstream is inputted to the de-emphasis section, in which the emphasis is released and then the result is inputted to the band compression section 2, in which the signal is subjected to band compression processing through differential coding and the result is outputted to the outside of a downstream. Thus, the signal is outputted to the outside of the downstream after band compression is implemented while suppressing distortion at a high frequency band.
    • 54. 发明专利
    • DATA SPEED CONVERTING CIRCUIT
    • JPS61167239A
    • 1986-07-28
    • JP869585
    • 1985-01-21
    • NEC CORP
    • USAMI MASAHIKO
    • H04J3/06H04J3/18
    • PURPOSE:To obtain an output signal converted into an 8-bit speed from a position of a synchronizing signal independently of a frequency of a high-speed clock by forming a 2-1 selection circuit controlled by a load signal and a latch circuit connected in cascade with the selection circuit to form a parallel/serial converting circuit. CONSTITUTION:A signal from the inside of a load signal generating circuit 14-2 of a control signal generating circuit 14 stops a counter at a prescribed value, the content is decoded to generate a load signal. Since a 2-1 selection circuit 15-2 or the like controlled by the said load signal and a latch circuit 15-1 or the like connected in cascade with the said 2-1 selection circuit form a parallel/serial converting circuit 15, an output signal subjected to speed conversion in an 8-bit from the location of the synchronizing signal is obtained independently of the high-speed clock frequency.
    • 55. 发明专利
    • Data converting circuit
    • 数据转换电路
    • JPS60214133A
    • 1985-10-26
    • JP7040884
    • 1984-04-09
    • Fujitsu Ltd
    • IYOTA TOSHIOOGURA TAKAYUKIHASHIMOTO KENICHISHIRAI HIROAKI
    • H04J3/00H04J3/18
    • H04J3/18
    • PURPOSE:To decrease the converting delay time by storing data of a specific channel of a multiplex serial form to the 1st memory, reading the data in a burst way and applying prescribed converting processing, storing it in the 2nd memory and reading it. CONSTITUTION:A counter CRT1 designates a write address to a memory MEM1, gives a write command to a selector SEL1, writes a specific channel CH on the MEM1 sequentially, confirms the final m-th specific CH data inputted to the MEM1, reads the 1st m-th specific CH data in a burst way and applies a prescribed converting processing by a read processing circuit PRO. A counter CTR2 designates an address to a memory MEM2, writes the specific CH data on the MEM2 finished for processing via a selector SEL2, starts reading at the transmission point of time of the 1st specific CH of the next frame and transmits the processed data via the selector SEL. Thus, the delay time required for two frames in conventional systems is decreased to that of one frame's share.
    • 目的:通过将多路复用串行格式的特定通道的数据存储到第一个存储器来减少转换延迟时间,以突发方式读取数据并应用规定的转换处理,将其存储在第二个存储器中并读取。 构成:计数器CRT1向存储器MEM1指定写入地址,向选择器SEL1发出写入命令,依次向MEM1写入特定的通道CH,确认输入到MEM1的最后的第m个特定CH数据,读取第1个 m特定CH数据,并通过读处理电路PRO执行规定的转换处理。 计数器CTR2表示存储器MEM2的地址,经由选择器SEL2将特定CH数据写入已经完成处理的MEM2,在下一帧的第1特定CH的发送时刻开始读取,并经由 选择器SEL。 因此,传统系统中两帧所需的延迟时间减少到一帧的份额。