Home videoconferencing system (HVS)

• US 5,675,375 A
• Filed: 12/15/1994
• Issued: 10/07/1997
• Est. Priority Date: 12/15/1994
• Status: Expired due to Term

• Current Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Riffee, Robert Keith
• Primary Examiner(s): Chan, Wing F.
• Application Number:
  US08/356,683
• Time in Patent Office: 1,027 Days
• Field of Search: 348/14-19, 379/201-205, 379/96-98, 379/93, 382/41, 382/56
• US Class Current: 348/14.1
• CPC Class Codes: H04N 7/142 Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
• CPC Class Codes: H04N 7/148 Interfacing a video terminal to a particular transmission medium, e.g. ISDN
• CPC Class Codes: H04N 7/15 Conference systems

Abstract

A home videoconferencing system 100 uses a standard television receiver 16 and a camcorder 14. The video controller 112 converts an outgoing analog video signal into a compressed digital video signal; an audio controller 116 converts an outgoing analog audio signal into a compressed digital audio signal. The system controller 120 multiplexes, synchronizes and error corrects outgoing and incoming digital system signals. The digital system signals are coupled to a modem 122 for transmission and reception over analog phone lines 124.

Claims

1. A system for videoconferencing comprising:

a standard television monitor for receiving and outputting incoming television signals;

a standard telephone line for receiving incoming standard telephone signals and sending outgoing standard telephone signals;

a camcorder for generating outgoing television signals including a series of standard television video and audio signals;

a video controller coupled to the camcorder and to the television receiver for receiving standard outgoing video signals from the camcorder and for receiving compressed incoming digital video signals, for converting said standard outgoing video signals into compressed digital video signals, and for converting incoming compressed digital video signals into standard television video signals for video output on said television monitor, wherein the video controller comprises a processor having a memory for storing a plurality of compression and decompression programs for compressing the digital video signal received from the camcorder and for decompressing the digital video data for output to the television monitor and the video controller selects one of the plurality of compression and decompression programs;

a audio controller coupled to the camcorder and to the television receiver for receiving standard outgoing audio signals from the camcorder and for receiving compressed incoming digital audio signals, for convening said standard outgoing audio signals into compressed digital audio signals, and for converting incoming compressed digital audio signals into standard television audio signals for audio output on said television monitor;

a system controller for receiving the outgoing compressed digital video signals and the outgoing compressed digital audio signals of the video and audio controllers and for multiplexing the compressed outgoing digital video and outgoing digital audio signals into outgoing system digital signals and for demultiplexing incoming system digital signals into incoming compressed digital video signals and incoming compressed digital audio signals;

a modem coupled to a standard telephone line and to the system controller and under the control of the system controller for converting the outgoing system digital signals into outgoing standard telephone signals for transmission on the standard telephone lines and for converting incoming standard telephone signals into incoming system digital signals.

2. The system of claim 1 wherein the video controller issues file access commands for accessing files from a disk drive memory and the system controller comprises a program for converting the issued file access commands into memory locations in the system controller memory, thereby emulating the disk drive memory.

3. The system of claim 1 wherein the video controller performs a discrete cosine transformation on the digital video signals.

4. The system of claim 1 wherein the audio controller comprises a digital signal processor having a memory for storing a plurality of compression and decompression programs for compressing the digital audio signal received from the camcorder and for decompressing the digital audio data for output to the television monitor.

5. The system of claim 4 wherein the audio controller transforms the digital audio signals.

6. The system of claim 1 wherein the system controller arranges the multiplexed outgoing compressed digital video and audio signals into frames of data for output to the modem.

7. The system of claim 6 wherein the system controller synchronizes the respective transmission and reception of outgoing and incoming frames of data.

8. The system of claim 1 wherein the controller adds error correction data to the outgoing system digital signals.

9. A home videoconferencing unit comprising:

a video controller having an analog video input for receiving an outgoing analog video signal from a camcorder, an analog video output for providing a standard analog video signal to a television receiver, a digital video input for receiving compressed incoming digital video signal, said video controller converting said standard outgoing video signal into a compressed digital video signal, and converting an incoming compressed digital video signal into a standard television video signals for video output on a television monitor, wherein the video controller comprises processor having a memory for storing a plurality of compression and decompression programs for compressing the digital video signal received from the camcorder and for decompressing the digital video data for output to the television monitor and the video controller selects one of the plurality of compression and decompression program;

a audio controller having an analog audio input for receiving an outgoing analog audio signal from a microphone, an analog audio output for providing a standard analog audio signal to a speaker, a digital audio input for receiving a compressed incoming digital audio signal, said audio controller converting said standard outgoing audio signal into a compressed digital audio signal and converting an incoming compressed digital audio signal into a standard television audio signal for audio output on a speaker;

a system controller for receiving the outgoing compressed digital video signal and the outgoing compressed digital audio signal of the video and audio controllers and for multiplexing the compressed outgoing digital video and outgoing digital audio signals into outgoing system digital signal and for demultiplexing an incoming system digital signal into an incoming compressed digital video signal and an incoming compressed digital audio signal;

a modem coupled to a standard telephone line and to the system controller and under the control of the system controller for converting the outgoing system digital signal into outgoing standard telephone signals for transmission on the standard telephone lines and for converting the incoming standard telephone signal into incoming system digital signals.

10. The system of claim 9 wherein the controller adds error correction data to the outgoing system digital signals.

11. The system of claim 9 wherein the video controller issues file access commands for accessing files from a disk drive memory and the system controller comprises a program for converting the issued file access commands into memory locations in the system controller memory, thereby emulating the disk drive memory.

12. The system of claim 9 wherein the video controller performs a discrete cosine transformation on the digital video signals.

13. The system of claim 10 wherein the audio controller comprises a digital signal processor having a memory for storing a plurality of compression and decompression programs for compressing the digital audio signal received from the camcorder and for decompressing the digital audio data for output to the television monitor.

14. The system of claim 13 wherein the audio controller transforms the digital audio signals.

15. The system of claim 9 wherein the system controller arranges the multiplexed outgoing compressed digital video and audio signals into frames of data for output to the modem.

16. The system of claim 15 wherein the system controller synchronizes the respective transmission and reception of outgoing and incoming frames of data.

17. A method of home video conferencing comprising the steps of:

receiving and outputting incoming television signals on a television monitor;

receiving incoming standard telephone signals and sending outgoing standard telephone signals over standard telephone lines;

generating outgoing television signals including a series of standard television video and audio signals;

converting said standard outgoing video signals into compressed digital video signals and converting incoming compressed digital video signals into standard television video signals for video output on said television monitor;

converting said standard outgoing audio signals into compressed digital audio signals and converting incoming compressed digital audio signals into standard television audio signals for audio output on said television monitor;

multiplexing the compressed outgoing digital video and outgoing digital audio signals into outgoing system digital signals and demultiplexing incoming system digital signals into incoming compressed digital video signals and incoming compressed digital audio signals;

convening the outgoing system digital signals into outgoing standard telephone signals for transmission on the standard telephone lines and convening incoming standard telephone signals into incoming system digital signals; and

storing a plurality of video compression and decompression programs, compressing the digital video signal received from the camcorder in accordance with one of said video compression programs and decompressing the digital video data in accordance with one of said stored video decompression programs in order to provide an output to the television monitor.

18. The method of claim 17 further comprising the steps of arranging multiplex outgoing digital video and audio signals into outgoing frames of data.

19. The method of claim 18 comprising the further step of synchronizing the respective transmission and reception of outgoing and incoming frames of data.

20. The method of claim 17 further comprising the step of correcting errors in outgoing and incoming frames of data.

21. The method of claim 17 further comprising the step of performing a discrete cosine transformation on the digital video signals.

22. The method of claim 17 further comprising the steps of storing a plurality of audio compression and decompression programs, compressing the digital audio signal received from the camcorder in accordance with one of said stored audio compression programs and decompressing the digital audio data in accordance with one of said stored audio decompression program in order to output audio to a speaker.

23. The method of claim 22 further comprising the step of transforming the digital audio signals.

24. The method of claim 17 further comprising the steps of issuing file access commands for accessing files from a disk drive memory and converting the issued file access commands into memory locations in the system controller memory, thereby emulating the disk drive memory.