Abstract: When inserting several types of digital watermark information into the digital information, the visual time stamp detection circuit extracts the time stamps corresponding to the visual data in the visual data stream and the digital watermark insertion circuit specifies the types of the digital watermark information to be inserted corresponding to the extracted time stamps and inserts the digital watermark information of the applicable types into the visual data so that such information is synthesized with the audio data by the mixer circuit.

Abstract: A moving image data compressor/decompressor is provided that compresses moving image data with high compressibility and high image quality maintained. The image data extractor 8 extracts image data on a partial area with large motion in a frame. The first data compressor 10 compresses the image data on the partial area. The image reducer 12 reduces the size of the frame. The second data compressor compresses the data concerning the size-reduced frame. The compressed data output unit 16 holds data groups sequentially into the hard disk 208, together with positional information on a partial area. Each of the data groups is formed of frame data compressed by the second data compressor 14 and image data on a partial area compressed by the first data compressor 10, for each frame forming a moving image.

Abstract: A moving image data compressor/decompressor is provided that compresses moving image data with high compressibility and high image quality maintained. The image data extractor 8 extracts image data on a partial area with large motion in a frame. The first data compressor 10 compresses the image data on the partial area. The image reducer 12 reduces the size of the frame. The second data compressor compresses the data concerning the size-reduced frame. The compressed data output unit 16 holds data groups sequentially into the hard disk 208, together with positional information on a partial area. Each of the data groups is formed of frame data compressed by the second data compressor 14 and image data on a partial area compressed by the first data compressor 10, for each frame forming a moving image.

Abstract: When inserting several types of digital watermark information into the digital information, the visual time stamp detection circuit extracts the time stamps corresponding to the visual data in the visual data stream and the digital watermark insertion circuit specifies the types of the digital watermark information to be inserted corresponding to the extracted time stamps and inserts the digital watermark information of the applicable types into the visual data so that such information is synthesized with the audio data by the mixer circuit.

Abstract: An electronic balance adjusting circuit comprises a register for holding a balance data and capable of changing the balance data held in the register, a first ALU receiving the balance data held in the register for outputting a first digital value corresponding to a first ratio, and a second ALU receiving the balance data held in the register for outputting a second digital value corresponding to a second ratio having such an inverse increase/decrease relation to the first ratio that when the first ratio increases, the second ratio decreases and when the first ratio decreases, the second ratio increases. A first digital-to-analog converter receives the first digital value to output a first analog signal indicative of the first ratio, and a second digital-to-analog converter receives the second digital value to output a second analog signal indicative of the second ratio.

Abstract: A turn-off circuit for GTOs has a three-phase, full-wave rectifier. The output voltage of the three-phase, full-wave rectifier is applied as a turn-off power source to a charge/discharge capacitor.