Recording and Reproducing Apparatus and Receiving Apparatus

• US 20090214192A1
• Filed: 05/04/2009
• Published: 08/27/2009
• Est. Priority Date: 06/16/2005
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Sadao Tsuruga, Takashi Kanemaru
• Inventors: Kanemaru, Takashi, Tsuruga, Sadao
• Granted Patent: US 7,876,653 B2
• Time in Patent Office: Days
• US Class Current: 386/248
• CPC Class Codes: H04N 5/76 Television signal recording
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal

Abstract

Where a clock frequency based on which encoding is performed has deviated over time, problems such as that an appropriate digital signal can not be outputted occur. To solve the problems, it is arranged such that when a decoder decodes video data and audio data, a control variable for controlling a frequency of a clock recovered by a clock generating portion is recorded as needed in a recording portion, and when the decoder decodes data recorded in the recording portion, the clock generating portion is controlled by using the control variable so that system time information generated by the counter synchronizes with time information extracted upon reception of a digital broadcasting program.

Claims

1. A recording and reproducing apparatus comprising:

a receiving portion that receives broadcast data;

an extracting portion that extracts video data, audio data, and time information from the broadcast data;

a counting portion that generates system time information from the time information;

a clock generating portion that generates a clock signal in accordance with which the counting portion is operated;

a decoding portion that decodes, the video data and the audio data that are extracted by the extracting portion;

a recording portion that records the broadcast data; and

a control portion that operates to record, a control variable based on which a frequency of the clock signal generated by the clock generating portion is controlled when the decoding portion decodes the video data and the audio data, and to control the clock generating portion by using the control variable.

2. A recording and reproducing apparatus comprising:

a tuner that receives a digital broadcast signal;

an extracting portion that extracts video data, audio data, and time information from the digital broadcast signal;

a counter that generates system time information from the time information;

a clock generating portion that generates a clock signal in accordance with which the counter is operated;

a decoder that decodes the video data and the audio data that are extracted by the extracting portion;

a recording medium that records the digital broadcast signal;

a control portion that operates to record, a control variable based on which a frequency of the clock signal generated by the clock generating portion is controlled when the decoder decodes the video data and the audio data, and to control the clock generating portion by using the control variable.

3. A receiving apparatus comprising:

a tuner that receives a digital broadcast signal;

an extracting portion that extracts video data, audio data, and time information from the digital broadcast signal;

a counter that generates system time information from the time information;

a clock generating portion that generates a clock signal in accordance with which the counter is operated;

a decoder that decodes the video data and the audio data that are extracted by the extracting portion;

an encoder that encodes the video data and the audio data as decoded by the decoder; and

a control portion that controls the clock generating portion by using a control variable based on which a frequency of the clock signal generated by the clock generating portion is controlled when the decoder decodes the video data and the audio data, so that the system time information generated by the counter synchronizes with the time information extracted upon reception of the digital broadcast signal.