Apparatus for receiving compressed digital information

• US 7,286,310 B2
• Filed: 07/31/2006
• Issued: 10/23/2007
• Est. Priority Date: 07/06/1990
• Status: Expired due to Fees

• Current Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Arai, Hideo, Owashi, Hitoaki, Hosokawa, Kyoichi, Nishimura, Keizo, Watatani, Yoshizumi, Shibata, Akira
• Primary Examiner(s): DINH, TAN X
• Application Number:
  US11/495,464
• Publication Number:
  US 20060269254A1
• Time in Patent Office: 449 Days
• Field of Search: None
• US Class Current: 360/8
• CPC Class Codes: G11B 15/00 Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function driving or guiding heads G11B3/00 - G11B7/00, G11B21/00
• CPC Class Codes: G11B 15/1808 Driving of both record carrier and head G11B15/467 takes precedence; mounting of head G11B5/52
• CPC Class Codes: G11B 15/1875 adaptations for special effects or editing signal processing or indexing therefor G11B27/00
• CPC Class Codes: G11B 15/4671 by controlling simultaneously the speed of the tape and the speed of the rotating head
• CPC Class Codes: G11B 15/4673 by controlling the speed of the tape while the head is rotating
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 20/18 Error detection or correction; Testing , e.g. of drop-outs
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/005 Reproducing at a different information rate from the information rate of recording for television signals H04N5/783
• CPC Class Codes: G11B 27/032 on tapes G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/10 Indexing; Addressing; Timing or synchronising; Measuring tape travel
• CPC Class Codes: G11B 5/00839 using cyclically driven heads providing segmented tracks
• CPC Class Codes: G11B 5/0086 using cyclically driven heads providing segmented tracks
• CPC Class Codes: G11B 5/09 Digital recording
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/926 by pulse code modulation H04N5/919 takes precedence
• CPC Class Codes: H04N 9/7921 : for more than one processing mode
• CPC Class Codes: H04N 9/7973 : by dividing the luminance or colour component signal samples or frequency bands among a plurality of recording channels H04N9/804, H04N9/825 take precedence
• CPC Class Codes: H04N 9/8042 : involving data reduction

Abstract

An apparatus for receiving digital information including a receiver which receives the digital information that has digital video information bit-compressed by a first compression system, digital audio information bit-compressed by a second compression system, and error-detection information added to both the digital video information and the digital audio information. There is also provided a demodulator which demodulates the digital information received by the receiver, an error detector which detects an error of digital information demodulated by the demodulator by use of the error-detection information, a first expander which bit-expands video information among the digital information error detected by the error detector corresponding system, and a second expander which bit-expands audio information among the digital information error detected by the error detector corresponding to the second compression system.

Claims

1. An apparatus for receiving digital information including at least one of digital video information and digital audio information, comprising:

a receiver which receives the digital information that has digital video information bit-compressed by a first compression system, digital audio information bit-compressed by a second compression system, and error-detection information added to both the digital video information and the digital audio information;

a demodulator which demodulates the digital information received by the receiver;

an error detector which detects an error of digital information demodulated by the demodulator by use of the error-detection information;

a first expander which bit-expands video information among the digital information error detected by the error detector corresponding system; and

a second expander which bit-expands audio information among the digital information error detected by the error detector corresponding to the second compression system.

2. An apparatus according to claim 1, wherein the first compression system and the second compression system are different systems.

3. An apparatus according to claim 1, wherein the demodulator affects QPSK demodulation.

4. An apparatus according to claim 1, further comprising;

an output terminal which outputs the digital information error-detected by the error detector to a recording/reproducing apparatus;

an input terminal which inputs a reproduced signal from the recording/reproducing apparatus; and

a selector which selects one of the digital information error-detected by the error detector and the digital information inputted from the input terminal;

wherein the digital information selected by the selector is bit-expanded by the first expander and the second expander.

5. An apparatus according to claim 1, wherein the first compression system uses a discrete cosine transform, the received digital information is phase-modulated, and the demodulator demodulates the digital information received by the receiver in accordance with the phase-modulation.

6. An apparatus for processing a transmitted digital signal including at least one of a video signal and an audio signal, comprising:

a receiver which receives the transmitted digital signal, wherein the transmitted digital signal includes a video signal bit-compressed by a first compression method, an audio signal bit-compressed by a second compression method, and an error correction signal added commonly to both the video signal and the audio signal;

a demodulator which demodulates the digital signal received by the receiver;

an error corrector which corrects an error of the digital signal demodulated by the demodulator based on the error correction signal;

a first expander which bit-expands the video signal of the digital signal corrected by the error corrector in accordance with the first compression method; and

a second expander which bit-expands the audio signal of the digital signal corrected by the error corrector in accordance with the second compression method.

7. The apparatus according to claim 6, wherein the first compression method utilizes a discrete cosine transform.