Receiving device for audio-video system

• US 8,810,730 B2
• Filed: 11/08/2007
• Issued: 08/19/2014
• Est. Priority Date: 11/09/2006
• Status: Active Grant

• Current Assignee: Realtek Semiconductor Corp.
• Original Assignee: Realtek Semiconductor Corp.
• Inventors: Tung, Hsu-Jung, Lin, Tzuo-Bo
• Primary Examiner(s): Lin, Jason K
• Application Number:
  US11/937,108
• Publication Number:
  US 20080111921A1
• Time in Patent Office: 2,476 Days
• Field of Search: 348180-194, 348553-570, 348/909
• US Class Current: 348/607
• CPC Class Codes: H04N 21/4394 involving operations for analysing the audio stream, e.g. detecting features or characteristics in audio streams arrangements characterised by components specially adapted for monitoring, identification or recognition of audio in broadcast systems H04H60/58
• CPC Class Codes: H04N 21/4396 by muting the audio signal
• CPC Class Codes: H04N 21/44008 involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 5/44 Receiver circuitry for the reception of television signals according to analogue transmission standards H04N5/14 takes precedence

Abstract

The invention relates to a receiving device for an audio-video system. The receiving device comprises a connector, a video processing unit, an audio processing module, and a monitoring unit. The monitoring unit detects a status of an inputted signal received by the connector and controls the operation of at lease one of the video processing unit and the audio processing module in accordance with the detected result to avoid the audio-video system display abnormal image or play noise when the receiving device did not receive the inputted signal by accident.

Claims

1. A receiving device for an audio-video system comprising:

a connector for receiving an inputted signal, the connector adopts a standard of transmission interface with a serial link format to transmit digitized audio-video data;

a video processing unit for processing video data included in the inputted signal;

an audio processing module for processing audio data included in the inputted signal; and

a monitoring unit for detecting a status of the inputted signal, transmitting a first control signal to control an operation of the video processing unit, and transmitting a second control signal to control an operation of the audio processing module, the first control signal and second control signal being transmitted in accordance with the detected status, wherein the monitoring unit detects a video signal corresponding to the video data in the inputted signal or an audio signal corresponding to the audio data in the inputted signal, wherein the monitoring unit detects a change of a voltage level in the inputted signal within a predetermined period;

wherein the audio processing module comprises a noise processing module for smoothing the audio signal to generate a continual audio signal in response to the monitoring unit detecting that the audio signal contains a discontinuous waveform, the noise processing module comprising;

a signal generating unit for receiving the second control signal from the monitoring unit and generating an adjusting signal based on the second control signal; and

a determining unit for smoothing the audio signal according to the adjusting signal.

2. The receiving device as claimed in claim 1, wherein the monitoring unit detects a clock signal in the inputted signal.

3. The receiving device as claimed in claim 1, further comprising a decoder and an audio-video separating unit coupled between the connector and the video processing unit.

4. The receiving device as claimed in claim 1, wherein the standard of transmission interface conforms to High Definition Multimedia Interface standard.

5. The receiving device as claimed in claim 1, wherein the standard of transmission interface conforms to Display Port standard.

6. The receiving device as claimed in claim 1, wherein the standard of transmission interface conforms to Unified Display Interface standard.

8. The receiving device as claimed in claim 1, wherein the determining unit of the noise processing module reduces a gain value of the audio signal based on the adjusting signal.

9. The receiving device as claimed in claim 8, wherein the determining unit comprises a multiplier.

7. A receiving device in an audio-video system, comprising:

a connector configured to receive an input signal, the connector being compatible with a standard of transmission interface with a serial link format for transmitting digitized audio-video data;

a video processing unit configured to process video data within the input signal;

an audio processing module configured to process audio data within the input signal; and

a monitoring unit configured to monitor a connection status of a cable to the connector, the monitoring unit being further configured to control at least one of the video processing unit and the audio processing module responsive to the connection status, wherein the monitoring unit is further configured to detect a video signal corresponding to the video data in the input signal or an audio signal corresponding to the audio data in the input signal, wherein the monitoring unit is further configured to detect a change in a voltage level of the input signal occurring within a predetermined period of time;

wherein the audio processing module comprises a noise processing module for smoothing the audio signal to generate a continual audio signal in response to the monitoring unit detecting that the audio signal contains a discontinuous waveform; and

wherein the monitoring unit is further configured to detect the voltage level of the input signal to determine if the voltage level is a floating level.

10. The receiving device as claimed in claim 7, wherein the monitoring unit detects a clock signal in the input signal.

11. The receiving device as claimed in claim 7, further comprising a decoder and an audio-video separating unit coupled between the connector and the video processing unit.

12. The receiving device as claimed in claim 7, wherein the standard of transmission interface conforms to at least one of High Definition Multimedia Interface standard, Display Port standard, and Unified Display Interface standard.

13. The receiving device as claimed in claim 7, wherein the monitoring unit is configured to transmit a first control signal for controlling an operation of the video processing unit and a second control signal for controlling an operation of the audio processing module.

14. The receiving device as claimed in claim 7, wherein the noise processing module comprises:

a signal generating unit for receiving the second control signal from the monitoring unit and generating an adjusting signal based on the second control signal; and

a determining unit for smoothing the audio signal according to the adjusting signal.

15. The receiving device as claimed in claim 14, wherein the determining unit of the noise processing module reduces a gain value of the audio signal based on the adjusting signal.

16. The receiving device as claimed in claim 15, wherein the determining unit comprises a multiplier.