Recording and reproducing apparatus and receiving apparatus

• US 7,876,653 B2
• Filed: 05/04/2009
• Issued: 01/25/2011
• Est. Priority Date: 06/16/2005
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kanemaru, Takashi, Tsuruga, Sadao
• Primary Examiner(s): Tran; Thang V
• Application Number:
  US12/434,820
• Publication Number:
  US 20090214192A1
• Time in Patent Office: 631 Days
• Field of Search: 369/47.19, 369/47.28, 369/47.16, 369/47.23, 369/47.24, 369/47.55, 386/46, 386/96, 386/124
• US Class Current: 369/47.28
• 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 contains video data, audio data, and time information;

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

a clock generating portion that generates a clock signal in accordance with an operation of the counting portion;

a decoding portion that decodes, using the system time information generated by the counting portion, the video data and the audio data;

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 from receiving portion, and to control the clock generating portion by using the control variable when the decoding portion decodes the video data and the audio data recorded in the recording portion.

2. The recording and reproducing apparatus according to claim 1, wherein the control portion instructs to update the control variable as needed.

3. The recording and reproducing apparatus according to claim 2, wherein the control portion instructs to update the control variable, when a signal instructing to update the control variable is inputted.

4. A recording and reproducing apparatus comprising:

a tuner that receives a digital broadcast signal which contains video data, audio data, and time information;

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

a clock generating portion that generates a clock signal in accordance with an operation of the counter;

a decoder that decodes, by referencing the system time information generated by the counter, the video data and the audio data;

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 from the tuner, and to control the clock generating portion by using the control variable when the decoder decodes the video data and the audio data recorded in the recording medium.

5. The receiving apparatus according to claim 4, wherein the control portion operates to update the control variable as needed.

6. A receiving apparatus comprising:

a tuner that receives a digital broadcast signal which contains video data, audio data, and time information;

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

a clock generating portion that generates a clock signal in accordance with an operation of the counter;

a decoder that decodes, by referencing the system time information, the video data and the audio data;

an encoder that encodes the video data and the audio data as decoded by the decoder, based on the clock signal generated by the clock generating portion; and

a control portion that controls the clock generating portion, when the encoder encodes the video data and the audio data, 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 from the tuner.

7. The receiving apparatus according to claim 6, wherein the control portion operates to update the control variable as needed.