Multisystem signal processing and recording/reproducing apparatus

Claim 2

A multisystem adaptable type signal processing apparatus for decoding a video signal in a hierarchical structure, comprising: hierarchical coding means (A108, A109) for setting the frequency ratio and block unit ratio (HD/NT) of first and second video signals so as to set the relation between a low bit rate coding block unit HD corresponding to the pixel structure of the first video signal having a wide frequency band and a low bit rate coding block unit NT corresponding to the pixel structure of the second video signal having a frequency band narrower than that of the first video signal to an integral ratio in vertical and horizontal directions, setting a processing signal of the block unit NT in the first hierarchical level in which the first video signal can be reproduced, and setting a processing signal of the block unit HD in the second hierarchical level in which the second video signal can be reproduced by using the signal of the first hierarchical level.

Claim 3

A multisystem adaptable type signal processing apparatus for recording and reproducing a signal with respect to a magnetic tape by using a rotation head device, comprising: a first head (202) for standard (SD) recording; a second head (201) for high-vision (HD) recording; a third head (204) for standard (SD) recording; and a fourth head (203) for high-vision (HD) recording; wherein said first to fourth heads are arranged on a rotation drum such that said first and second heads are set in an inverse azimuth relation, said third and fourth heads are set in an inverse azimuth relation, said first and third heads are set in an inverse azimuth relation, said second and fourth heads are set in an inverse azimuth relation, and adjacent tracks respectively formed by said first to fourth heads are set in an inverse azimuth relation.

Claim 4

A multisystem adaptable type signal processing apparatus for scanning a rotation head in an oblique direction with respect to the width of a magnetic tape, comprising: detection means (E202 to E204) for detecting the number of tracks covered by a reproducing rotation head when said reproducing rotation head scans the magnetic tape at a preset angle; and determination means (E205) for determining a tape format of a magnetic tape under reproduction according to the number of tracks detected by said detection means.

Claim 5

A diversified recording/reproducing apparatus for scanning a rotation head in an oblique direction with respect to the width of a magnetic tape, comprising: binary coding means (E231) for binary coding a reproducing signal; measuring means (E232) for measuring time from a transition point of a signal output from said binary coding means to a next transition point thereof; accumulating means (E233) for receiving an output of said measuring means, calculating and accumulating the number of occurrences of the measured times; specifying means (E234) for specifying a time having a large number of occurrences based on the result accumulated in said accumulating means; recording means (E237, E238) for previously storing standard tape formats and times corresponding to the respective formats and predicted to have large numbers of occurrences based on the respective formats; determination means (E236) for comparing the content of said specifying means with the contents of said storing means to determine a tape format corresponding to the specified time; and means (E235) for determining the format of a tape under reproduction as an analog recording tape when the tape format cannot be determined by said determining means or when the time having a large number of occurrences cannot be specified.

Claim 6

An analog/digital signal processing apparatus for recording and reproducing a signal with respect to a magnetic tape by use of a rotation head device, comprising; an equalizing circuit (J20) for equalizing a signal output from said rotation head device; a high-pass filter (H10) having a cut-off frequency which can be varied, for receiving a reproduced signal from said equalizing circuit and cutting off the low frequency components thereof; a low-pass filter (H50) having the same cut-off frequency as that of said high-pass filter; adding means (H20) which can be selectively set into a state for adding together outputs of said low-pass filter and high-pass filter in a digital processing mode and output the result of addition or state for permitting the output of said high-pass filter to be passed therethrough in an analog processing mode; and an identifying circuit (H30) including a phase-locked loop, for receiving an output of said adding means and supplying a demodulated output.

Claim 7

An analog/digital signal processing apparatus comprising; a latch circuit (H302) driven by an output of a voltage-controlled oscillator (H304), for receiving an output obtained by subjecting an input signal to a wave shaping process; a switch (H305) for permitting one of outputs of said latch circuit and voltage-controlled oscillator to be selectively passed therethrough; a phase comparator (H303) for comparing phases of the input signal and an output of said switch; and control means (H40) for determining whether the input signal is a digital signal or analog signal, controlling said switch to select an output of said voltage-controlled oscillator and causing an output of said phase comparator to be derived as an analog demodulation output when the input signal is an analog signal and controlling said switch to select an output of said latch circuit and causing an output of said latch circuit to be derived as a digital reproduced output when the input signal is a digital signal.

Claim 8

An analog/digital signal processing apparatus according to claim 7, characterized by further comprising: an A/D converter (H301) provided in the preceding stage of said latch circuit, for subjecting the input signal to the analog/digital conversion and supplying the most significant bit thereof to said latch circuit and phase comparator; a comparator (H311) for receiving an output of said A/D converter, comparing the output of said A/D converter with preset data and outputting the result of comparison; and a drop-out determining circuit (H312) for detecting the drop-out from the output content of said comparator.

Claim 9

A reproduced signal processing apparatus for processing a reproduced signal reproduced from a magnetic tape, comprising: means (L102) for generating a signal (which is hereinafter referred to as a 4nf signal) having a frequency 4n (n is a natural number) times that of a low frequency conversion color signal contained in the reproduced signal; an A/D converter (L101) for subjecting the low frequency conversion color signal to the analog/digital conversion by using the 4nf signal as a sampling frequency; data creating means (L103 to L105) for receiving a signal output from said A/D converter and obtaining data items at sampling points advanced (or delayed) by n, 2n and 3n points; a switch (L106) for selectively deriving data items having different amounts of lead (or amounts of lag) for each horizontal period from an output of said data creation means; and crosstalk removing means (L108, L109) for adding together an output of said switch and a signal obtained by delaying the output of said switch by one horizontal period.

Claim 10

A reproduced signal processing apparatus for processing a reproduced signal reproduced from a magnetic tape, comprising: means (L102) for generating a signal (which is hereinafter referred to as a 4nf signal) having a frequency 4n (n is a natural number) times that of a low frequency conversion color signal contained in the reproduced signal; an A/D converter (L101) for subjecting the low frequency conversion color signal to the analog/digital conversion by using the 4nf signal as a sampling frequency; data creating means (L103, L111, L105) for receiving a signal output from said A/D converter and including at least one polarity inverting circuit for obtaining data items at sampling points advanced (or delayed) by n, 2n and 3n points; a switch (L106) for selectively deriving data items having different amounts of lead (or amounts of lag) for each horizontal period from an output of said data creation means; and crosstalk removing means (L108, L109) for adding together an output of said switch and a signal obtained by delaying the output of said switch by one horizontal period.

Claim 11

A reproduced signal processing apparatus for recording and reproducing a signal from a magnetic tape by using a rotation head device, comprising: a first A/D converter (F211) for converting a reproduced analog luminance signal (which is hereinafter referred to as an analog Y signal) into a digital Y signal; a second A/D converter (F221) for converting a reproduced analog color signal (which is hereinafter referred to as an analog C signal) into a digital C signal; first block conversion means (F212) for dividing the digital Y signal into blocks; second block conversion means (F223) for dividing the digital C signal into blocks; first orthogonal transformation means (F213) for transforming the Y signal divided into the blocks to a frequency base signal; second orthogonal transformation means (F223) for transforming the C signal divided into the blocks to a frequency base signal; first quantization means (F214) for quantizing the Y signal transformed into the frequency components by said first orthogonal transformation means by use of a desired quantization table; second quantization means (F224) for quantizing the C signal transformed into the frequency components by said second orthogonal transformation means by use of the same quantization table as that used for quantization of the Y signal; standardizing means (F228) for cutting off that of the C signal quantized by said second quantization means whose frequency is higher than that of the Y signal quantized by said first quantization means or cutting off a frequency component of a signal whose frequency is higher than that of the Y signal and obtained after a portion corresponding to a limited amount of the C signal is previously removed when the frequency band of the C signal is limited; first inverse quantization means (F215) for quantizing an output of said first quantization means again by use of a quantization table having an inverse characteristic with respect to the quantization table used at the time of quantization; second inverse quantization means (F225) for quantizing an output of said standardizing means again by use of a quantization table having an inverse characteristic with respect to the quantization table used at the time of quantization by said second quantization means; first inverse orthogonal transformation means (F216) for subjecting an output of said first inverse quantization means to the inverse transformation with respect to the transformation by said first orthogonal transformation means; second inverse orthogonal transformation means (F226) for subjecting an output of said second inverse quantization means to the inverse transformation with respect to the transformation by said second orthogonal transformation means; first D/A converting means (F217) for converting an output of said first inverse orthogonal transformation means into an analog Y signal; and second D/A converting means (F227) for converting an output of said second inverse orthogonal transformation means into an analog C signal.

Claim 12

A multisystem adaptable type signal processing apparatus having decoding means for receiving a low bit rate coded signal and decoding the signal, comprising: block size changing means (G601) for changing the block size of the coded signal according to the pixel ratio between an original image of the coded signal and an output specified image; inverse orthogonal transformation means (G603) for subjecting an output of said block size changing means to the inverse orthogonal transformation according to the block size; prediction image creation means (G605, G606) for converting the image size to a value corresponding to the size of the output specifying image to create a prediction image by using an output of said inverse orthogonal transformation means and motion vector information input together with the low bit rate coded signal; switching means (G608) for deriving an addition of an output of said prediction image creation means and an output of said inverse orthogonal transformation means or an output of said inverse orthogonal transformation means; masking means (G611, G612) for masking an area of the output of the switching means in which no image is present; and means (G613, G614) for receiving an output of said masking means and adjusting the frame frequency having a difference caused by a difference between the original image and an output specifying image.

Claim 13

A multisystem adaptable type signal processing apparatus having decoding means for receiving a low bit rate coded signal and decoding the same, comprising: input means (G643) for selectively receiving a plurality of low bit rate coded signals; block size changing means (G644) for changing block sizes of the low bit rate coded signals according to pixel sizes of output specifying images respectively specified for the low bit rate coded signals; inverse orthogonal transformation means (G645) for subjecting the low bit rate coded signals output from said block size changing means to the inverse orthogonal transformation corresponding to the respective block sizes thereof; prediction image creation means (G641, G651 to G653) for creating and output a prediction image by using converted motion vector information obtained by converting the size of motion vector information input together with the low bit rate coded signals to a value corresponding to the size of the output specifying images for the respective low bit rate coded signals; and switching means (G647) for deriving an output of said inverse orthogonal transformation means or an addition of an output of said prediction image creation means and an output of said inverse orthogonal transformation means.