US PATENT SUBCLASS 348 / 384
BANDWIDTH REDUCTION SYSTEM

Current as of: June, 1999
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348 /   HD   TELEVISION

384BANDWIDTH REDUCTION SYSTEM {7}
385  DF  .~> Plural video programs in single channel {2}
388  DF  .~> Multiple channel (e.g., plural carrier) {1}
390  DF  .~> Bit-rate reduction {11}
426  DF  .~> Format type (e.g., HDTV or EDTV) {3}
438  DF  .~> Individual processing of different parts of image frequency band (e.g., sum and difference, high band/low band)
439  DF  .~> Frame field or line dropping followed by time expansion and time compression
440  DF  .~> Scan rate variation

DEFINITION

Classification: 348/384

BANDWIDTH REDUCTION SYSTEM:

(under the class definition) Subject matter including apparatus to compress the frequency range of the signal produced by a picture signal generator prior to transmission to accommodate the bandwidth limitation of the transmission medium or means at the receiver to utilize the signal to reconstruct an image.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

50+, for code converters wherein the signal may be encoded to reduce bandwidth.

358, Facsimile,

426+, for bandwidth reduction systems peculiar to facsimile.

375, Pulse or Digital Communications,

240+, for bandwidth reduction or expansion. 704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,

500, 504 for bandwidth, or time compression, or expansion of audio signals.