 Communication system for providing a transport entity with mutually related objects |
| OF THE INVENTION In the communication system according to FIG. 1, a broadcast server 2 is coupled ... |
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| Method and apparatus for controlling connections between devices |
| Referring to the figures, exemplary embodiments of the invention will now be described. The ... |
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| Graphical method of inputing time values |
| In the present invention, a user can enter time information by direct use of a mouse or other ... |
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| Method and system for viewing graphic images in a data processing system |
| It is therefore one object of the present invention to provide an improved data processing system. I... |
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| Method and system for manipulating data through a graphic user interface within a data processing system |
| It is therefore one object of the present invention to provide an improved data processing system. I... |
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| Data broadcast receiving apparatus with screen display state control |
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| Versatile time division multiple access slot assignment unit |
| The present invention is a versatile time division multiple access ("TDMA") slot allocation unit. I... |
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| Image processing system |
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| Image compression encoding and decoding method and apparatus therefor |
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Audio signal section apparatus
| Details |
Inventors: Bell, Issac M.; Sendelweck, Gene K.;
Assignee: Thomson Consumer Electronics, Inc. (Indianapolis, IN)
Primary Examiner: Peng; John K.
Assistant Examiner:
Attorney, Agent or Firm: Tripoli; Joseph S., Emanuel; Peter M., Lenihan; Thomas F.
A television receiver having picture-in-picture capability and having multiple electronically selectable auxiliary baseband signal inputs provides automatic selection of the proper audio signal by use of bilevel digital switching circuitry. |
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DETAILED DESCRIPTION OF THE EMBODIMENT Referring to prior art FIG.
1, a controller 100 receives user-entered control signals from a local keyboard 105 and from an infrared (IR) receiver 110.
IR receiver 110 receives and decodes remote control signals transmitted by a remote control unit 115.
Controller 100, which may be a microprocessor or microcomputer, causes a television tuner 120 to select a particular RF signal to be tuned in response to data entered by a user.
Tuner 120 produces a signal at an intermediate frequency (IF) and applies it to a processing unit 125 comprising a first section 125a including a picture (PIX) amplifying stage and video detector, and a second section 125b including, a sound amplifying stage, an audio detector and a stereo decoder.
Processing unit 125 produces a baseband video signal (TV), and baseband left and right audio signals.
The baseband video signal (TV) is coupled via line 126 to one input of a four input video switch 130.
The baseband left and right audio signals are applied to one pair of inputs of an audio switch 140 capable of selecting a pair of inputs from four pairs of audio inputs.
Video switch 130 and audio switch 140 each have three other inputs labelled AUX1, AUX2 and AUX3, for receiving respective baseband video and audio signals from external sources.
Each of the inputs of video switch 130 and audio switch 140 is selectable in response to binary signals generated by controller 100 and applied to control inputs C.
sub.
1 and C.
sub.
0 via conductors 231 and 232, respectively.
For example, if C.
sub.
1 and C.
sub.
0 are both caused to be at a low signal level (i.
e.
binary 00), then the TV input is selected.
If C.
sub.
1 is low and C.
sub.
0 high (binary 01), then AUXl is selected.
If C.
sub.
1 is high and C.
sub.
0 low (binary 10), then AUX2 is selected.
If both C.
sub.
1 and C.
sub.
0 are high (binary 11), then AUX3 is selected.
The selection of corresponding video and audio signals is ensured because the control lines 231 and 232 are coupled to respective control inputs C
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Television 
