Television apparatus Pix-in-Pix

Claim 2

In a pix-in-pix television display -including a source of main video signal and a source of auxiliary video signal, apparatus for displaying an image developed from the auxiliary signal as an inset in the image developed from the main signal characterized by means (10,40) for developing main and auxiliary sampled data signals representing respectively the main and auxiliary video signals, said signals having respective sampling rates that are in a ratio of K to 1, K being a real number greater than zero; means (14) responsive to said auxiliary sampled data signal for developing a compressed auxiliary sampled data signal by subsampling said auxiliary sampled data signal in a ratio of one to N, N being a real number greater than two; means (38) for displaying said main sampled data signal at a predetermined rate; and means (22,26,34,36) for displaying said compressed auxiliary sampled data signal as an inset in the display of said main sampled data signal at a rate substantially equal to M/(N * K) times said predetermined rate to produce an apparent size reduction of 1/M in said auxiliary image, M being an integer greater than one and less than N.

Claim 3

The apparatus as set forth in Claim 1, characterized by auxiliary image vertical signal processing means including means for subsampling the horizontal line portions of said compressed auxiliary sampled data signal to reduce the number of horizontal lines in said auxiliary image by a ratio of one to M, M being a positive integer greater than one and less than N; auxiliary image displaying means coupled to said auxiliary image vertical signal processing means for displaying each of the horizontal line portions of the signals provided thereby as an inset in a respectively different horizontal line portion of said main sampled data signal at a rate substantially equal to M/N times said predetermined rate to produce an apparent size reduction of 1/M in both the vertical and horizontal dimensions of said auxiliary image.

Claim 4

The apparatus set forth in claim 2 characterized in that said auxiliary image vertical signal processing means further includes vertical signal filtering means comprising: memory means, having a sufficient number of storage cells for holding the samples which represent one horizontal line portion of said compressed auxiliary sampled data signal; means coupled to said memory means and responsive to said compressed auxiliary sampled data signal for subtracting therefrom a corresponding sample from said memory means; sample scaling means coupled to said subtracting means for multiplying the difference samples provided by said subtracting means by a scale factor; and means coupled to said memory means and to said sample scaling means for adding said scaled difference samples to corresponding samples from said memory means and for providing the summed samples to said memory means.

Claim 5

The apparatus set forth in Claim 3 characterized in that said means for developing a compressed auxiliary sampled data signal includes means for subsampling said auxiliary sampled data signal in a ratio of one to five; said vertical signal filtering means provides one horizontal line portion of said compressed auxiliary sampled data signal for every three horizontal line portions developed by said subsampling means; said sample scaling means scales the difference samples developed by subtracting the samples provided by said memory from said first line of samples by a scale factor of one and scales the difference samples developed by subtracting the samples provided by said memory from said second and third lines of samples by respective scale factors of one-half and three-eighths; and said auxiliary image displaying means includes means for displaying the signals provided by said auxiliary image vertical signal processing means at a rate substantially equal to three-fifths times said predetermined rate.

Claim 7

In a pix-in-pix television display including a source of main video signal and a source of auxiliary video signal, each of said signals being composed of successive horizontal line portions, wherein said auxiliary video signal has a luminance signal component having a predetermined bandwidth and may have a chrominance signal component having a bandwidth approximately equal to 1/L times said predetermined bandwidth, L being an integer greater than 1, apparatus for displaying an image developed from the auxiliary signal as an inset in the image developed from the main signal characterized by means for developing main and auxiliary sampled data signals representing respectively the main and auxiliary video signals, said sampled data signals having sampling rates that are substantially equal; means responsive to said auxiliary sampled data signal for separating the luminance and chrominance signal components therefrom to provide auxiliary sampled data luminance and chrominance signals; means coupled to said separation means for developing compressed auxiliary sampled data luminance and chrominance signals by subsampling said sampled data luminance signal in a ratio of one to N and by subsampling said auxiliary sampled data chrominance signal in a ratio of one to the quantity L times N, N being an integer greater than two; auxiliary image signal processing means including means for subsampling the horizontal line portions of said compressed auxiliary sampled data luminance and chrominance signals to reduce the number of lines in said auxiliary image by a ratio of one to M, M being a positive integer less than N; means for displaying said main sampled data signal at a predetermined rate; means coupled to said auxiliary image signal processing means for combining respective samples of said compressed auxiliary luminance and chrominance signals in an L to one ratio; and means for displaying each of the horizontal line portions of said combined sampled data signals as an inset in a respectively different horizontal line portion of said main sampled data signal at a rate substantially equal to M/N times said predetermined rate to produce an apparent size reduction of 1/M in both the vertical and horizontal dimensions of said auxiliary image.

Claim 8

In a pix-in-pix television display including a source of main video signal and a source of auxiliary video signal, each of said signals being composed of successive horizontal line portions, wherein said auxiliary video signal has a luminance signal component having a predetermined bandwidth and may have a chrominance signal component having a bandwidth approximately equal to 1/L times said predetermined bandwidth, L being an integer greater than 1, apparatus for displaying an image developed from the auxiliary signal as an inset in the image developed from the main signal characterized by means for developing main and auxiliary sampled data signals representing respectively the main and auxiliary video signals, said sampled data signals having sampling rates that are substantially equal; means responsive to said auxiliary sampled data signal for separating the luminance and chrominance signal components therefrom to provide auxiliary sampled data luminance and chrominance signals; means coupled to said separation means for developing compressed auxiliary sampled data luminance and chrominance signals by subsampling said sampled data luminance signal in a ratio of one to N and by subsampling said auxiliary sampled data chrominance signal in a ratio of one to the quantity L times N, N being an integer greater than two; auxiliary image signal processing means including means for subsampling the horizontal line portions of said compressed auxiliary sampled data luminance and chrominance signals to reduce the number of lines in said auxiliary image by a ratio of one to M, M being a positive integer less than N; means for displaying said main sampled data signal at a predetermined rate; means coupled to said auxiliary image signal processing means for combining respective samples of said compressed auxiliary luminance and chrominance signals in an L to one ratio; and means for displaying each of the horizontal line portions of said combined sampled data signals as an inset in a respectively different horizontal line portion of said main sampled data signal at a rate substantially equal to M/N times said predetermined rate to produce an apparent size reduction of 1/M in both the vertical and horizontal dimensions of said auxiliary image.

Claim 9

The apparatus set forth in claim 6 characterized in that said auxiliary image signal processing means further includes vertical signal filtering means comprising: memory means, having a sufficient number of storage cells for holding the samples which represent one horizontal line portion of said compressed auxiliary sampled data signal; means coupled to said memory means and responsive to said compressed auxiliary sampled data signal for subtracting therefrom corresponding samples from said memory means; sample scaling means coupled to said subtracting means for multiplying the difference samples provided by said subtracting means by a scale factor; and means coupled to said memory means and to said sample scaling means for adding said scaled difference samples to corresponding samples from said memory means and for providing the summed samples to said memory means.

Claim 10

The apparatus set forth in claim 7 characterized in that the chrominance signal component has a bandwidth that is approximately one-fourth times the bandwidth of said luminance signal component and includes first and second color difference signal components; said separating means includes means for developing a sampled data luminance signal having a sample rate substantially equal to said predetermined rate and means for developing first and second sampled data color difference signals representing respectively said first and second color difference signal components and each having a sample rate substantially equal to one-half times said predetermined rate; said means for developing compressed sampled data luminance and chrominance signals includes means for subsampling said sampled data luminance signal in a ratio of one to five and means for subsampling each of said first and second sampled data color difference signals in a ratio of one to ten; said vertical signal filtering means provides one horizontal line portion of each of said compressed auxiliary sampled data luminance and first and second color difference signals respectively for every three horizontal line portions of the respective signals provided by said subsampling means; said combining means includes means for combining respective samples of said compressed auxiliary luminance signal and each of said compressed auxiliary first and second color difference signals in a four-to-one ratio to produce red, green and blue sampled data primary color signals; and said displaying means includes means for displaying said red, green and blue sampled data primary color signals at a rate three-fifths times said predetermined rate.

Claim 11

The apparatus set forth in claim 8 characterized in that said auxiliary video signal includes a chrominance reference signal component having a predetermined frequency and said main video signal includes a horizontal line synchronizing signal component; said sampled data signal developing means includes: first clock signal developing means responsive to said chrominance reference signal component of said auxiliary video signal for developing a first clock signal having a frequency four times said predetermined frequency and locked in phase with the chrominance reference signal component of said auxiliary video signal; means coupled to said first clock signal developing means for sampling said auxiliary video signal at instants determined by said first clock signal; and said displaying means includes: means responsive to the horizontal line synchronizing signal component of said main video signal for developing a second clock signal having a frequency substantially equal to three-fifths times said predetermined frequency and locked in phase with the horizontal line synchronizing signal component of said main video signal; and means for displaying said red, green and blue sampled data primary color signals synchronously with said second clock signal.