Chroma signal regeneration device

Abstract

Abstract PURPOSE:To emphasize and recording a low-level signal through a chroma emphasis circuit during recording, and to eliminate non-linearity of recording through a chroma deephasis circuit during reproduction. CONSTITUTION:Only a chroma signal in a video signal inputted from an input terminal 1 is extracted through a BPF7. Then, the chroma signal adjusted to a specific level by the AGC circuit consisting of a variable gain amplifier 8 and a detecting circuit 12 is inputted to a chroma emphasis circuit 31. The chroma signal having a low-level signal emphasized is frequency-converted to a low frequency band by a recording processing circuit 10 and outputted as a low-frequency converted color signal through an LPF11. This signal is inputted to an input terminal 33 through a regenerative amplifier and supplied to an LPF24. The chroma signal passed through the LPF24 is adjusted to a specific level through the AGC circuit consisting of a variable gain amplifier 25 and a detecting circuit 29 and then reconverted from the low-frequency converted color signal into the original chroma signal through a regeneration processing circuit 26 and a comb-shaped filter 27. Then, a chroma deemphasis circuit 34 corrects nonlinearity of recording.

Inventors

• 👤 Keiichi Komatsu
• 👤 小松　恵一
• 👤 Akira Shibata
• 👤 晃 柴田
• 👤 Noboru Kojima
• 👤 昇 小島
• 👤 Tomomitsu Azeyanagi
• 👤 畔柳　朝光

Bibliographic Details