Picture output device

• US 4,760,455 A
• Filed: 11/19/1986
• Issued: 07/26/1988
• Est. Priority Date: 11/29/1985
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nagashima, Yoshitake
• Primary Examiner(s): BRITTON, HOWARD W
• Application Number:
  US06/932,772
• Time in Patent Office: 615 Days
• Field of Search: 358/140, 358/242, 358/254, 358/22, 358/148
• US Class Current: 348/556
• CPC Class Codes: H04N 3/27 Circuits special to multi-standard receivers
• CPC Class Codes: H04N 7/0122 the input and the output signals having different aspect ratios

Abstract

A picture output device of the present invention receives inputs in the form of a first picture signal with n horizontal scanning lines within the vertical scanning period or a second picture signal with m (m>n) horizontal scanning lines within the vertical scanning period, wherein the first picture signal after received is converted in the number of lines within the vertical scanning period to m, and a picture based on either one of the thus-converted first picture signal and the second picture signal is displayed.

Claims

1. A picture output device comprising:

(A) input means at which a first picture signal of horizontal scanning repeated n times within the vertical scanning period, a second picture signal of horizontal scanning repeated m (m>

n) times within the vertical scanning period and a different aspect ratio from that of said first picture signal, a third picture signal of horizontal scanning repeated kn times (where k is 2 or higher an integer) within the vertical scanning period and an equal aspect ratio to that of said first picture signal can enter;

(B) scanning converting means receptive of said first picture signal inputted from said input means for producing an output representing that the number of times the horizontal scanning is repeated within the vertical scanning period is converted to k×

n;

(C) display means capable of displaying a picture based on the picture signal; and

(D) display operation control means for selectively supplying said second picture signal, said third picture signal and said converted first picture signal by said scanning converting means to said display means, and for controlling the display operation of said display means in accordance with the number of times the horizontal scanning is repeated within the vertical scanning period of the supplied one of said picture signals.

2. A device according to claim 1, wherein said scanning changing means includes:

(A) interpolation-processing means for interpolation-processing said first picture signal inputted from said input means; and

(B) compressing means for compressing the time axis for every one horizontal scanning period of the interpolation-processed first picture signal by said interpolation-processing means.

3. A device according to claim 2, wherein said interpolation-processing means includes a line interpolation circuit.

4. A device according to claim 2, wherein said compressing means is arranged so that the time axis of the interpolation-processed first picture signal is 1/k times as long as before the compression.

5. A device according to claim 1, wherein said display operation control means includes:

(A) synchronizing signal separating means receptive of the picture signal inputted from said input means for producing the horizontal and vertical synchronizing signals;

(B) counting means for counting the number of horizontal synchronizing signals in one vertical synchronizing period of the separated vertical synchronizing signal by said synchronizing signal separating means; and

(C) display operation control signal generating means for producing a control signal for the display operation of said display means depending on the counted value in said counter means.

6. A device according to claim 5, wherein said display means is arranged so as to display a picture in a aspect ratio depending on the display operation control signal generated from said display operation control signal generating means.

7. A device according to claim 5, wherein said display means includes:

(A) a vertical display range setting circuit responsive to the vertical synchronizing signal separated by said synchronizing signal separating means for setting a display range of vertical direction of the displayed picture in the display area; and

(B) a horizontal display range setting circuit responsive to the horizontal synchronizing signal separated by said synchronizing signal separating means for setting a display range of horizontal direction of the displayed picture in the display area.

8. A device according to claim 7, wherein said display means includes a display portion capable of displaying a picture based on the aspect ratio of said third picture signal.

9. A device according to claim 8, wherein said vertical display range setting circuit is arranged to change over the display range of vertical direction in response to said display operation control signal.

10. A device according to claim 7, wherein said display means includes a display portion capable of displaying a picture based on the aspect ratio of said second picture signal.

11. A device according to claim 10, wherein said horizontal display range setting circuit is arranged so as to change over the display range of horizontal direction in response to said display operation control signal.

12. A device according to claim 1, wherein said display operation control means includes:

(A) synchronizing signal separating means for separating horizontal and vertical synchronizing signals from the picture signal which enters said input means;

(B) counting means for counting the number of horizontal synchronizing signals in one vertical synchronizing period of the vertical synchronizing signal separated by said synchronizing signal separating means;

(C) determining signal generating means responsive to the counted value of said counting means for determining whether the picture signal entering said input means is the first picture signal or the second picture signal to produce a determining signal;

(D) a vertical display range setting means responsive to the vertical synchronizing signal separated by said synchronizing signal separating means for setting a display range in the vertical direction for the displayed picture in the display area; and

(E) a horizontal display range setting means responsive to the horizontal synchronizing signal separated by said synchronizing means for setting a display range in the horizontal direction for the displayed picture in the display area.

13. A device according to claim 12, wherein said display means includes a display portion for displaying a picture based on the aspect ratio of the first picture signal.

14. A device according to claim 13, wherein said vertical display range setting circuit is operative to change the display range in the vertical direction in response to said determining signal.

15. A device according to claim 14, wherein said picture output device further comprises masking means for masking portions of said display area other than the display portion corresponding to said determining signal.

16. A device according to claim 12, wherein said display means includes a display portion for displaying a picture based on the aspect ratio of said second picture signal.

17. A device according to claim 16, wherein said horizontal display range setting circuit is operative to change the display range in the horizontal direction in response to said determining signal.

18. A device according to claim 17, wherein said picture output device further comprises masking means for masking portions of said display area other than the horizontal display portion corresponding to said determining signal.