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:
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:
An electronic optical display device comprising two substrates and an electronic optical substance sealed in a gap formed between said substrates and displaying when an electric voltage is applied thereto is disclosed. The device comprises two upper and lower substrates which are the same in plane configuration and a lead electrode extending along the side surface of said substrates and is most suitable for use in a thin type digital watch.