Reproducing apparatus with dampling rate convertor for recording medium
having different respective sampling rates
    31.
    发明授权
    Reproducing apparatus with dampling rate convertor for recording medium having different respective sampling rates 失效
    具有用于具有不同取样率的记录介质的篡改速率转换器的再现装置

    公开(公告)号:US5825735A

    公开(公告)日:1998-10-20

    申请号:US935321

    申请日:1997-09-22

    摘要: A second generation CD provides improved sound quality over that provided by a first generation CD while remaining compatible with it has a higher sampling rate and has a data format of 1-bit .DELTA..SIGMA. modulation. The higher sampling frequency is an integer multiple of the standard sampling frequency of 44.1 kHz used in the first generation CD to thereby simplify the clock signal generation circuitry. The recording system uses decimation filters to lower the sampling frequency of the 1-bit .DELTA..SIGMA. modulation signal so that the same signal can be used to manufacture both a first generation CD and a second generation CD. The playback apparatus is compatible and the kind of disk is determined based on the table of contents information, so that the appropriate clock signals can be provided to the decoders. In the case of the first generation CD being played back, the data is converted by an oversampling filter and a .DELTA..SIGMA. modulator before being digital to analog converted.

    摘要翻译: 第二代CD提供比第一代CD提供的更好的声音质量,同时与其兼容,具有较高的采样率并具有1位DELTA SIGMA调制的数据格式。 较高的采样频率是第一代CD中使用的标准采样频率为44.1 kHz的整数倍,从而简化了时钟信号产生电路。 记录系统使用抽取滤波器来降低1位DELTA SIGMA调制信号的采样频率,使得可以使用相同的信号来制造第一代CD和第二代CD。 播放装置是兼容的,并且基于目录信息确定盘的种类,从而可以向解码器提供适当的时钟信号。 在第一代CD被播放的情况下,在进行数字到模拟转换之前,数据由过采样滤波器和DELTA SIGMA调制器转换。

    Method of and apparatus for interpolating digital signal, and apparatus
for and methos of recording and/or playing back recording medium
    32.
    发明授权
    Method of and apparatus for interpolating digital signal, and apparatus for and methos of recording and/or playing back recording medium 失效
    用于内插数字信号的方法和装置,以及记录和/或播放记录介质的装置和方法

    公开(公告)号:US5761218A

    公开(公告)日:1998-06-02

    申请号:US682563

    申请日:1996-09-23

    申请人: Yasuhiro Ogura

    发明人: Yasuhiro Ogura

    摘要: An apparatus and method for interpolating a digital signal where an input data signal from a data input terminal 1 is supplied through a memory 2 to an FIR low-pass digital filter 4. The memory 2 is controlled by a control circuit 6 to supply data preceding and following data which have suffered an error to the digital filter 4 to extract values A, and B. The values A, and B are calculated by an interpolation data generating circuit 7 to generate a value Y0. The data preceding and following data which have suffered an error is supplied to the digital filter 4 to extract a value A0. To the value A0, there is added values Bn calculated in advance by supplying all interpolation data which the error portion can take to an arbitrary position of the digital filter 4. The sum is compared with the value Y0. Interpolation data is generated according to a value Bn at which the sum is closest to the value Y0, and interpolation data is delivered from a data selector 3 to a data output terminal 8. This arrangement is capable of interpolating a digital signal digitized in an arbitrary small number of bits.

    摘要翻译: PCT No.PCT / JP95 / 02457 Sec。 371日期1996年9月23日 102(e)1996年9月23日PCT 1995年12月1日PCT PCT。 出版物WO96 / 17449 日期1996年6月6日用于内插数字信号的装置和方法,其中来自数据输入端1的输入数据信号通过存储器2提供给FIR低通数字滤波器4.存储器2由控制电路 6向数字滤波器4提供已经发生错误的数据之前和之后的数据,以提取值A和B.由内插数据产生电路7计算值A和B以产生值Y0。 向数字滤波器4提供遭受错误的数据前后的数据,以提取值A0。 对于值A0,通过将误差部分可以采用的所有插值数据提供给数字滤波器4的任意位置,预先计算出相加值Bn。该和与值Y0进行比较。 根据总和最接近值Y0的值Bn产生插值数据,并且插值数据从数据选择器3传送到数据输出端子8.这种布置能够内插以任意数字化的数字信号 小数位。