High definition digital video recorder
AssigneeSony Corporation
InventorsFumiaki Henmi, Yoshihiro Murakami, Takashi Sasaya, Takao Abe
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Abstract
A digital video tape recorder with a standard image quality mode that minimizes recording time and a high image quality mode that maximizes image quality is realized using the same hardware for both modes. Compression circuitry is simplified and power requirements are reduced by band limiting an input video signal before the signal is compressed using a bit rate reduction encoder.
Claims8
An apparatus for recording a digital video signal in one of a Standard Image Quality mode and a High Image Quality mode, comprising:
- a band limiting filter for reducing a sampling ratio of said digital signal from an input sampling ratio to a predetermined sampling ratio and producing a band limited signal;
- bit rate reduction means for compressing said band limited signal by a selected compression ratio using a selected compression mode and producing a compressed digital signal, wherein in said Standard Image Quality mode said compression ratio is selected to be 8/35 and in said High Image Quality mode said compression ratio is selected to be 16/35;
- an error correction encoder for adding error detection information to said compressed digital signal and producing a compressed recording signal;
- and
- recording means for forming a recording of said compressed recording signal on a recording medium.
A method for recording a digital video signal in one of a Stand Image Quality mode and a High Image Quality mode, comprising the steps of:
- band limiting said digital video signal from an input sampling ratio to a predetermined sampling ratio and producing a band limited signal;
- compressing said band limited signal by a selected compression ratio using a selected compression mode and producing a compressed digital signal, wherein in said Standard Image Quality mode said compression ratio is selected to be 8/35 and in said High Image Quality mode said compression ratio is selected to be 16/35;
- error encoding said compressed digital signal to add information for detecting errors in said compressed digital signal and producing compressed recording signal;
- and
- recording said compressed recording signal on a recording medium.
Dependencies are inferred from the claim text.