Digital signal processing apparatus

Claim 2

The apparatus of claim 1, wherein said compressed frequency components are framed, digitized video data, and said means for receiving includes means (4) for de-framing received digitized video data and wherein said means for processing processes said de-framed digitized video data.

Claim 3

The apparatus of claim 2, wherein said means for receiving further comprises means (2) for detecting errors in said digitized video data and for correcting said detected errors.

Claim 4

The apparatus of claim 1, wherein said means for processing selectively achieves white fade-in, white fade-out, black fade-in and black fade-out effects.

Claim 5

The apparatus of claim 1, wherein said means for processing selectively achieves color fade-in and color fade-out effects.

Claim 6

The apparatus of claim 1, wherein said compressed frequency compontents include an orthogonally transformed DC component and said means for processing operates upon said DC component.

Claim 7

The apparatus of claim 6, wherein said DC component comprises a luminance portion and a chrominance portion.

Claim 8

The apparatus of claim 7, wherein said means for processing comprises means (88) for generating a control value, means (81) for varying said control value, and means (82) for adding the varied control value to said luminance portion of the DC component such that said fade-out effect and said fade-in effect are controlled by varying said control value.

Claim 9

The apparatus of claim 8, wherein said means for processing increases the control value from a predetermined minimum value to a predetermined maximum value to achieve said fade-out effect and decreases the control value from said predetermined maximum value to said predetermined minimum value to achieve said fade-in effect.

Claim 10

The apparatus of claim 7, wherein said means for processing comprises means (88) for generating a control value, means (85) for varying said control value, means (86) for adding said control value to said chrominance portion of the DC component when a value of said chrominance portion is below a predetermined value and means (86) for subtracting said control value from said chrominance portion of the DC component when said value of said chrominance portion is above said predetermined value, such that said fade-out effect and said fade-in effect are controlled by varying said control value.

Claim 11

The apparatus of claim 1, wherein said received compressed frequency components comprise a non-compressed DC component and compressed AC components.

Claim 12

The apparatus of claim 1, wherein said means for processing operates upon only said compressed frequency components of said digital video signal to selectively achieve fade-in, fade-out and scene change effects.

Claim 13

The apparatus of claim 1, wherein said digital video signal is an image signal.

Claim 14

The apparatus of claim 1, wherein said compressed frequency components of said digital video signal are compressed frequency components of a discrete cosine transformed video signal.

Claim 15

The apparatus of claim 1, further comprising means for reproducing said processed digital video signal.

Claim 16

Digital image signal processing apparatus in which compressed frequency components of a digital image signal are scrambled, comprising: means for receiving said compressed frequency components of said digital image signal; and means for selectively scrambling at least a portion of said digital image signal by scrambling selected ones of said compressed frequency components.

Claim 17

The apparatus of claim 16, further comprising means for determining whether the digital image signal should be scrambled and for controlling said means for selectively scrambling in accordance with that determination.

Claim 18

The apparatus of claim 16, wherein said means for scrambling scrambles selected fields of said digital image signal.

Claim 19

The apparatus of claim 16, wherein said compressed frequency components of said digital image signal comprise a DC component and AC components and wherein said means for scrambling scrambles only said DC component.

Claim 20

The apparatus of claim 16, further comprising means for recording said scrambled digital image signal on a recording medium.

Claim 21

The apparatus of claim 16, wherein said means for receiving comprises means for reproducing said compressed frequency components of said digital image signal from a recording medium.

Claim 22

The apparatus of claim 21, wherein said record medium comprises a digital video tape stored in a housing and having a memory device disposed in said housing, said memory device storing a tape ID number; and further comprising means for retrieving said stored tape ID number; and wherein said means for selectively scrambling scrambles said digital image signal when said retrieved tape ID number differs from a predetermined number.

Claim 23

The apparatus of claim 16, further comprising means for determining whether the received compressed frequency components of said digital image signal are scrambled; and means for selectively descrambling said compressed frequency components in response to such determination.

Claim 24

The apparatus of claim 16, wherein said compressed frequency components of said digital image signal are compressed frequency components of a discrete cosine transformed image signal.

Claim 25

Digital image signal processing apparatus in which scrambled compressed frequency components of a digital image signal are descrambled, comprising: means for receiving said scrambled compressed frequency components of said digital image signal; and means for selectively descrambling at least a portion of said digital image signal by descrambling said scrambled compressed frequency components.

Claim 26

The apparatus of claim 25, further comprising means for reproducing said descrambled digital image signal.

Claim 27

The apparatus of claim 25, further comprising means for determining whether the scrambled compressed frequency components of said digital image signal should be descrambled and for controlling said means for selectively descrambling in accordance with that determination.