Device and method for transmitting an audio signal using a video signal line in a computer system
First Claim
1. A data transmission apparatus for transmitting an audio signal through a video signal cable, comprising:
- a monitor including a sound speaker and a video display;
a computer system comprising;
audio generating means for generating an audio signal;
video generating means for generating a video signal and synchronization signals,first audio buffer means for temporarily retaining the audio signal and outputting the audio signal during a blanking interval of the video signal in accordance with the synchronization signals; and
multiplexer means for multiplexing the audio signal with the video signal by inserting the audio signal into the blanking interval of the video signal, and for generating a multiplexed signal;
a video signal cable configuration comprising a plurality of leads connected between the computer system and the monitor, for transmitting the synchronization signals between the computer system and the monitor on at least one lead and separately transmitting on a different lead the multiplexed signal from the computer system to the monitor; and
said monitor comprising;
demultiplexer means connected to said video signal cable, for demultiplexing the multiplexed signal received from said video signal cable by separating the audio signal and the video signal from the multiplexed signal in accordance with a control signal, and for generating a separated audio signal and a separated video signal;
second audio buffer means for temporarily retaining the separated audio signal and outputting the separated audio signal to said sound speaker for sound production in accordance with the control signal and the synchronization signals; and
said video display connectable to receive the synchronization signals, said video display enabling a visual display of the separated video signal on a screen in accordance with the synchronization signals.
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Accused Products
Abstract
A data transmission apparatus for transmitting an audio signal through a video signal cable for a computer system including a monitor having a sound speaker. The computer system includes an audio generating device for generating an audio signal; a video generating device for generating a video signal and synchronization signals, a first audio buffer for temporary retaining the audio signal and outputting the audio signal during a blanking interval of the video signal in accordance with the synchronization signals; and a multiplexer for multiplexing the audio signal with the video signal by inserting the audio signal into the blanking interval of the video signal and for generating a multiplexed signal. A video signal cable is connected between the computer system and the monitor for transmitting the multiplexed signal from the computer system to the monitor. The monitor includes a demultiplexer connected to the video signal cable, for demultiplexing the multiplexed signal received from the video signal cable by separating the audio signal and the video signal from the multiplexed signal in accordance with a control signal and for generating a separated audio signal and a separated video signal; a second audio buffer for temporarily retaining the separated audio signal and outputting the separated audio signal to the sound speaker for sound production in accordance with the control signal and the synchronization signals; and a video display for simultaneously enabling a visual display of the separated video signal on a screen in accordance with the synchronization signals. The data transmission apparatus constructed according the principles of the present invention seeks to advantageously transmit the audio signal to the monitor for sound reproduction without requiring a separable audio cable.
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Citations
19 Claims
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1. A data transmission apparatus for transmitting an audio signal through a video signal cable, comprising:
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a monitor including a sound speaker and a video display; a computer system comprising; audio generating means for generating an audio signal; video generating means for generating a video signal and synchronization signals, first audio buffer means for temporarily retaining the audio signal and outputting the audio signal during a blanking interval of the video signal in accordance with the synchronization signals; and multiplexer means for multiplexing the audio signal with the video signal by inserting the audio signal into the blanking interval of the video signal, and for generating a multiplexed signal; a video signal cable configuration comprising a plurality of leads connected between the computer system and the monitor, for transmitting the synchronization signals between the computer system and the monitor on at least one lead and separately transmitting on a different lead the multiplexed signal from the computer system to the monitor; and said monitor comprising; demultiplexer means connected to said video signal cable, for demultiplexing the multiplexed signal received from said video signal cable by separating the audio signal and the video signal from the multiplexed signal in accordance with a control signal, and for generating a separated audio signal and a separated video signal; second audio buffer means for temporarily retaining the separated audio signal and outputting the separated audio signal to said sound speaker for sound production in accordance with the control signal and the synchronization signals; and said video display connectable to receive the synchronization signals, said video display enabling a visual display of the separated video signal on a screen in accordance with the synchronization signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for transmitting an audio signal through a video signal cable connected between a computer system and a monitor including a sound speaker, said method comprising the steps of:
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receiving an audio signal from a sound card; receiving synchronization signals and a video signal from a video card; multiplexing the audio signal with the video signal by inserting the audio signal into a blanking interval of the video signal in dependence upon the synchronization signals, to generate a multiplexed signal through said video signal cable connected between the computer system and the monitor; transmitting synchronization signals between the computer system and the monitor on at least one lead of said video signal cable, and separative transmitting on a different lead of said video signal cable the multiplexed signal from the computer system to the monitor; receiving the multiplexed signal from said video signal cable containing the audio signal and the video signal; demultiplexing the multiplexed signal received from said video signal cable by separating the audio signal and the video signal from the multiplexed signal in dependence upon said synchronization signals, to generate a separated audio signal and a separated video signal; generating audio sound production corresponding to the separated audio signal through said sound speaker in dependence upon said synchronization signals; and simultaneously with generation of said audio sound production, enabling a visual display of the separated video signal on a screen of the monitor in dependence upon said synchronization signals. - View Dependent Claims (11, 12, 13)
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14. A data transmission apparatus, comprising:
a computer system comprising of; digital audio generating means for generating digital samples of an audio signal; video generating means for generating an analog video signal and synchronization signals, first audio buffer means for temporary retaining the digital samples of the audio signal for time axis adjustment and outputting the digital samples of the audio signal during a blanking interval of the analog video signal in dependence upon the synchronization signals; and multiplexer means for multiplexing the digital samples of the audio signal with the analog video signal by inserting the digital samples of the audio signal into the blanking interval of the analog video signal, and for generating a multiplexed signal; a video signal cable configuration comprising a plurality of leads connected between the computer system and a monitor including a sound speaker, for transmitting the synchronization signals between the computer system and the monitor on at least one lead, and separately transmitting on a different lead the multiplexed signal from the computer system to the monitor through a video signal line; and said monitor comprised of; demultiplexer means connected to said video signal cable, for demultiplexing the multiplexed signal received from said video signal cable by separating the digital samples of the audio signal and the analog video signal from the multiplexed signal in dependence upon the synchronization signals, and for generating a separated digital audio signal and a separated analog video signal; second audio buffer means for temporarily retaining the separated digital audio signal and outputting the separated digital audio signal in dependence upon the synchronization signals; and converter means for converting the separated digital audio signal into an analog audio signal and outputting the analog audio signal through said sound speaker for sound production; and video display means connectable to receive the synchronization signals, said video display means simultaneously enabling a visual display of the separated analog video signal on a screen in dependence upon the synchronization signals. - View Dependent Claims (15, 16, 17, 18, 19)
Specification