# US 6,724,975 B1 · Products combining television and video recorder

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- Number: US 6,724,975 B1
- Document ID: US6724975B1
- Status: Granted
- Kind: B1
- Application number: 09/460,561
- Filed: 1999-12-14
- Granted: 2004-04-20
- Earliest claimed: 1999-12-14
- Assignees: Thomson Licensing
- Inventors: Raymond Cheong; Win Lwin
- Web page: https://patentgrep.com/patent/US6724975B1

## CPC

- H04N 5/775: between a recording apparatus and a television receiver
- H04N 5/148: {Video amplifiers (amplifiers in general H03F)}
- H04N 5/44: Receiver circuitry {for the reception of television signals according to analogue transmission standards} (H04N5/14 takes precedence)
- H04N 21/4147: PVR [Personal Video Recorder] (H04N5/76 takes precedence {; arrangements for broadcast with accumulation-type receivers H04H20/40})
- H04N 21/4334: {Recording operations (recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27)}
- H04N 21/4436: {Power management, e.g. shutting down unused components of the receiver (power management in computer systems G06F1/3203; hibernate or awake process in computer systems G06F9/4418)}
- H04N 17/045: {Self-contained testing apparatus}
- H04N 21/42646: {for reading from or writing on a non-volatile solid state storage medium, e.g. DVD, CD-ROM}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Combos comprising a display and a video recorder, which avoid a very bright image when switching from a standby recording mode to an on mode. In order to reduce cost, some combos include only one video circuit which is used by both the television and the video recorder, and which notably controls the level of its output signals directed to the display. This control is realized using a feedback loop that provides a feedback signal from the display. To avoid displaying a very bright image when switching the combo from a standby recording mode to an on mode, an amplification control circuit progressively revives an amplifier of the display.

## Claims

### Claim 1

An apparatus comprising:
a source of video signal;
a video circuit connected to the source and generating at least a first signal and a second signal;
a video recorder for recording the second signal on a medium;
a display comprising an amplifier for the first signal and displaying images coded in the first signal;
wherein a control signal is generated when the video recorder is functioning and when the display is switched on,
wherein the video circuit includes calibration means for adjustment of the first signal depending on a feedback signal from the display,
wherein an amplification control circuit it progressively revives the amplifier after the control signal is generated.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherein the amplification control circuit generates a biasing voltage of the amplifier.

### Claim 3 (depends on 2)

An apparatus according to claim 2, wherein the amplification control circuit includes a RC-circuit able to continuously vary the biasing voltage between a first voltage and a second voltage during a period of time.

### Claim 4 (depends on 3)

An apparatus according to claim 3, wherein the period of time is longer than 1 s.

### Claim 5 (depends on 1)

An apparatus according to claim 1, wherein the calibration means includes a feedback loop comprising a multiplier and a black level clamp which calibrate the first signal depending on the feedback signal.

### Claim 6 (depends on 1)

An apparatus according to claim 1, wherein the control signal is generated by a controller connected to the amplification control circuit.

### Claim 7 (depends on 6)

An apparatus according to claim 6, wherein the control signal is generated by the controller upon receipt of a signal from a remote-control or from a keyboard.

### Claim 8 (depends on 1)

An apparatus according to claim 1, wherein the control signal is representative of a mode of the apparatus.

### Claim 9 (depends on 1)

An apparatus according to claim 1, wherein the first signal is a set of three signals in R,G,B form.