Integrated television and video cassette recorder system

• US 5,940,572 A
• Filed: 11/27/1996
• Issued: 08/17/1999
• Est. Priority Date: 11/27/1996
• Status: Expired due to Fees

• Current Assignee: Daewoo Electronics (Government of South Korea), Sarnoff Corporation (SRI International, Inc.)
• Original Assignee: Daewoo Electronics (Government of South Korea), Sarnoff Corporation (SRI International, Inc.)
• Inventors: Low, Michael, Balaban, Alvin Reuben
• Primary Examiner(s): Garber, Wendy
• Assistant Examiner(s): Boccio, Vincent F.
• Application Number:
  US08/757,975
• Time in Patent Office: 993 Days
• Field of Search: 386/9, 386/25-26, 386/38, 386/46, 386/114, 386/116, 358/906, 358/909.1, 348/552, 348/606-607, 348/665, 348/908
• US Class Current: 386/358
• CPC Class Codes: H04N 5/08 Separation of synchronising signals from picture signals
• CPC Class Codes: H04N 5/126 whereby the synchronisation signal indirectly commands a frequency generator
• CPC Class Codes: H04N 5/20 Circuitry for controlling amplitude response
• CPC Class Codes: H04N 5/44 Receiver circuitry for the reception of television signals according to analogue transmission standards H04N5/14 takes precedence
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 9/64 Circuits for processing colour signals H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84
• CPC Class Codes: H04N 9/641 Multi-purpose receivers, e.g. for auxiliary information H04N9/642 takes precedence
• CPC Class Codes: H04N 9/68 for controlling the amplitude of colour signals, e.g. automatic chroma control circuits H04N9/71, H04N9/73 take precedence; camera processing pipelines for controlling the colour saturation of colour signals H04N23/86
• CPC Class Codes: H04N 9/83 the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
• CPC Class Codes: H04N 9/84 the recorded signal showing a feature, which is different in adjacent track parts, e.g. different phase or frequency
• CPC Class Codes: H04N 9/882 the signal being a composite colour television signal

Abstract

A system for processing both a composite video television (TV) signal and a video cassette recorder (VCR) playback signal containing a combined line noise canceller and comb filter sharing a single delay line and a 3.58 MHz oscillator that drives a quadrature demodulator for demodulating both playback chrominance signals extracted from the playback signal and television chrominance signals extracted from the television signal. The system also provides automatic gain control to both the composite video TV signal and the VCR playback signal.

Claims

1. An integrated television and video cassette recorder system for processing both a composite video television (TV) signal having a chrominance signal modulated onto a first carrier frequency and a video cassette recorder (VCR) playback signal having a chrominance signal modulated onto a second carrier frequency, said first carrier frequency being higher than said second carrier frequency, said system comprising:

a line noise canceller and a comb filter that share a signal delay line;

a chrominance separator for extracting said first chrominance signal from said composite video television (TV) signal and said second chrominance signal from said video cassette recorder (VCR) playback signal;

a frequency converter, coupled to said chrominance separator, for converting said first carrier frequency of said first chrominance signal into said second carrier frequency for said first chrominance signal; and

said comb filter is coupled to said frequency converter and filters either said second chrominance signal or said first chrominance signal having said second carrier frequency.

2. The system of claim 1 further comprising means for producing automatic gain control for said composite video television signal and said video cassette recorder playback signal.

3. An integrated television and video cassette recorder system for processing both a composite video television (TV) signal having a first chrominance signal modulated onto a first carrier frequency and a video cassette recorder (VCR) playback signal having a second chrominance signal modulated onto a second carrier frequency, said first carrier frequency being higher than said second carrier frequency, said system comprising:

a chrominance separator for extracting said first chrominance signal from said composite video television (TV) signal and said second chrominance signal from said video cassette recorder (VCR) playback signal;

a frequency converter, coupled to said chrominance separator, for converting said first carrier frequency of said first chrominance signal into said second carrier frequency for said first chrominance signal;

a comb filter, coupled to said frequency converter, for filtering either said second chrominance signal or said first chrominance signal having said second carrier frequency.

4. The system of claim 3 wherein said comb filter further comprises a line noise canceller, where said comb filter and said line noise filter share a single delay line.

5. The system of claim 4 wherein said delay line has a delay equal to the duration of a horizontal line duration.

6. The system of claim 3 further comprising:

an oscillator; and

a phase locked loop, coupled to said oscillator, for phase locking said oscillator to said second chrominance signal or said first chrominance signal having said second carrier frequency.

7. The system of claim 6 further comprising:

a quadrature demodulator, coupled to said oscillator, for demodulating either said second chrominance signal or said first chrominance signal having said second carrier frequency.

8. The system of claim 3 further comprising:

a frequency generator, coupled to said frequency converter, for generating a conversion frequency that converts a second chrominance signal carrier frequency to said first carrier frequency.

9. The system of claim 3 further comprising:

a luminance separator for generating a first luminance signal from said composite video television (TV) signal and a second luminance signal from said video cassette recorder (VCR) playback signal; and

a synchronization separator for extracting synchronization signals from either said first luminance signal or said second luminance.

10. An integrated television and video cassette recorder system for processing both a composite video television (TV) signal having a first chrominance signal modulated onto a first carrier frequency and a video cassette recorder (VCR) playback signal having a second chrominance signal modulated onto a second carrier frequency, said first carrier frequency being higher than said second carrier frequency, said system comprising:

a chrominance separator for extracting said first chrominance signal from said composite video television (TV) signal and said second chrominance signal from said video cassette recorder (VCR) playback signal;

a frequency converter, coupled to said chrominance separator, for converting said first carrier frequency of said first chrominance signal into said second carrier frequency for said first chrominance signal;

an oscillator, coupled to said frequency converter, for providing a frequency;

a phase locked loop, coupled to said oscillator, for phase locking said frequency of said oscillator to said second chrominance signal or said first chrominance signal having said second carrier frequency; and

a quadrature demodulator, coupled to said oscillator, for demodulating either said second chrominance signal or said first chrominance signal having said second carrier frequency.

11. The system of claim 10 further comprising:

a comb filter, coupled to said frequency converter, for filtering either said second chrominance signal or said first chrominance signal having said second carrier frequency.

12. The system of claim 10 wherein said comb filter further comprises a line noise canceller, where said comb filter and said line noise filter share a single delay line.

13. The system of claim 12 wherein said delay line has a delay equal to the duration of a horizontal line duration.

14. An integrated television and video cassette recorder system for processing both a composite video television (TV) signal having a first chrominance signal modulated onto a first carrier frequency and a video cassette recorder (VCR) playback signal having a second chrominance signal modulated onto a second carrier frequency, said first carrier frequency being higher than said second carrier frequency, said system comprising:

a chrominance separator for extracting said first chrominance signal from said composite video television (TV) signal and said second chrominance signal from said video cassette recorder (VCR) playback signal;

a frequency converter, coupled to said chrominance separator, for converting said first carrier frequency of said first chrominance signal into said second carrier frequency for said first chrominance signal;

a combined comb filter and line noise canceller, coupled to said frequency converter, for processing either said second chrominance signal or said first chrominance signal having said second carrier frequency, where said combined comb filter and line noise filter share a single delay line, and said delay line has a delay equal to the duration of a horizontal line duration;

an oscillator, coupled to said frequency converter, for producing a first conversion frequency;

a phase locked loop, coupled to said oscillator, for phase locking said oscillator to said second chrominance signal or said first chrominance signal having said second carrier frequency;

a quadrature demodulator, coupled to said oscillator, for demodulating either said second chrominance signal or said first chrominance signal having said second carrier frequency;

a frequency generator, coupled to said frequency converter, for generating a second conversion frequency that converts said second chrominance signal carrier frequency to said first carrier frequency, where said second conversion frequency is phase locked to a horizontal line frequency;

a luminance separator for generating a first luminance signal from said composite video television (TV) signal and a second luminance signal from said video cassette recorder (VCR) playback signal; and

a synchronization separator for extracting synchronization signals from either said first luminance signal or said second luminance.