§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0697792A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Recording digital video signals

Assignee: Sony Corp
•
Filing: 1995-08-18
•
Granted: —
•
Expires: 2015-08-18
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract In a technique for recording digital video signals, digital video signals in the form of DCT coefficients, obtained by e.g. discrete cosine transformation, are quantized and compressed so as to be recorded on a recording medium. A first quantization step decision unit (23) determines a quantization step in terms of a video segment made up of plural macro-blocks as a unit so that the quantity of quantized data is less than a pre-set data quantity. A second quantization step decision unit (24) determines a quantization step in terms of the macro-blocks as a unit so that the quantity of quantized data is less than the pre-set data quantity. A quantization unit (25) quantizes the digital video signals with quantization steps determined by the first and second quantization step decision units (23, 24). This enables efficient encoding and improved picture quality.

Inventors

  • 👤 Yuka C/O Int. Prop. Div. Sony Corp. Oikawa
  • 👤 Naofumi C/O Int. Prop. Div. Sony Corp Yanagihara
  • 👤 Nobuaki C/O Int. Prop. Div. Sony Corp Izumi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 09:55
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/917; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/134; H04N19/146; H04N19/149; H04N19/169; H04N19/17; H04N19/176; H04N19/189; H04N19/192; H04N19/60; H04N19/85; H04N19/88; H04N7/00; H04N7/24; H04N7/52; H04N7/54

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 83 words
A method for recording quantized and encoded digital video signals comprising the steps of: determining a quantization step in terms of a video segment made up of plural macro-blocks as a unit so that the quantity of quantized data is less than a pre-set data quantity; determining a quantization step in terms of the macro-blocks as a unit so that the quantity of quantized data is less than the pre-set data quantity; and quantizing the digital video signals with the determined quantization steps.
Claim 2
Dependent Claim 33 words
The method as claimed in claim 1, wherein the quantization step is determined on the macro-block basis by giving priority to the macro-block which is located at a mid portion of a picture.
Claim 3
Dependent Claim 19 words
The method as claimed in claim 1, wherein the number of the macro-blocks in the video segment is five.
Claim 4
Dependent Claim 35 words
The method as claimed in claim 1, wherein the first quantization step decision means calculates the optimum quantization step for each of the luminance signals and color signals of the video signals by arithmetic operations.
Claim 5
Independent Claim 109 words
An apparatus for recording quantized and encoded digital video signals comprising: first quantization step decision means for determining a quantization step in terms of a video segment made up of plural macro-blocks as a unit so that the quantity of quantized data is less than a pre-set data quantity; second quantization step decision means for determining a quantization step in terms of the macro-blocks as a unit so that the quantity of quantized data is less than a pre-set data quantity; and quantization means for quantizing the digital video signals with the quantization steps determined by said first quantization step decision means and said second quantization step decision means.
Claim 6
Dependent Claim 33 words
The apparatus as claimed in claim 5 wherein the quantization step is determined on the macro-block basis by giving priority to the macro-block which is located at a mid portion of a picture.
Claim 7
Dependent Claim 19 words
The apparatus as claimed in claim 6, wherein the number of the macro-blocks in the video segment is five.
Claim 8
Dependent Claim 35 words
The apparatus as claimed in claim 7, wherein the first quantization step decision means calculates the optimum quantization step for each of the luminance signals and color signals of the video signals by arithmetic operations.

References Cited (Backward Citations)

US5321440A Cited
US5317413A Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag