JP3325435B2 - Record processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an A / D converter for converting a CCD output of a subject image formed through an optical system into an NTS image.
More specifically, the present invention relates to a recording processing apparatus that records on a recording medium after C signal conversion processing, and more specifically, a recording processing apparatus that can perform NTSC signal conversion processing at high speed.

[0002]

2. Description of the Related Art In a recording processing apparatus such as an electronic still camera or the like, in order to generate a luminance signal from CCD data, basically three lines of data in the vertical direction are required for vertical enhancement processing. Thus, a one-line luminance signal can be generated from three lines of data. In such cases,
The A / D converted data of the CCD output is stored in a large external RAM, and the digital arithmetic unit accesses the external RAM to perform the NTSC signal conversion process.
There is a problem that it takes a long processing time because the access time is long.

[0003]

As a method for solving this problem, an internal RA of a digital arithmetic unit having a short access time is used.
A circuit configuration is conceivable in which three lines are transferred to M, and the internal RAM is converted and converted into an NTSC signal by accessing and processing (sequentially processing each line) the internal RAM by a digital processor. FIG. 4 shows the internal R of the digital arithmetic unit.
FIG. 5 is a diagram showing an example of creating a luminance signal by transferring data for three lines to the AM, and FIG. 5 is a flowchart for explaining the operation in that case. Initial settings are made for each circuit (step (hereinafter referred to as "S") 301), the A / D-converted CCD output is stored in an external RAM, and an internal RA is output.
M lines are transferred to M (S302). In this case, since the capacity of the internal RAM is small, it is impossible to hold all data for one line in the internal RAM. Therefore, the data is divided into several blocks in the horizontal direction and stored.

The digital processor performs color signal processing and luminance signal processing by accessing the internal RAM (S303). Next, FM modulation is performed and the data is transferred from the internal RAM to the external RAM (S304, S305). Then, the luminance signal processing for one line is completed (S306).
Then, it is determined whether or not the processing (for 525 lines) has been completed up to the last line. If the processing has been completed, the processing of one frame has been completed. In the above-described arithmetic processing, in order to reduce the processing time as much as possible, an internal RAM that can be accessed at a high speed is used, and the internal RAM and an external RAM with a slow access time are used.
It is necessary to minimize data transfer with the AM. For operations that use a lot of data, such as filter processing, RA
Access speed to M is one of the factors that determine the processing speed
Because it becomes one. In addition, although the access time of the internal RAM is short, the processing efficiency is low because the capacity is small as described above, and the processing time is not so fast. An object of the present invention is to provide a recording processing device capable of further increasing the processing speed of NTSC signal conversion in a digital arithmetic unit.

[0005]

In order to achieve the above-mentioned object, a recording processing apparatus according to the present invention stores data from a CCD in an external RAM and then stores the data in an internal RA of a digital arithmetic unit.
M, and performs an NTSC signal conversion process by performing an arithmetic operation with a digital arithmetic unit, and then transfers the data to the external RAM and records it on a recording medium. 1 block data is transferred from the external RAM to the internal RAM, and the first three lines and the next three lines of the four vertical lines
To th and the (n + 1) th line, color signal processing Contact
And the luminance signal processing and FM modulation for the n-th line, and the n-th FM-modulated data and the (n + 1) -th baseband data are transferred to the external RA.
M, and then the same processing as that performed on the first block data is performed on the first block data with respect to the second block data of 4 vertical lines × m horizontal blocks connected in the horizontal direction to the first block data. Is performed in this manner, the same processing is performed up to the block data at the end of the n-th line after the third block data, and then the (n +
1) The digital arithmetic unit performs NTSC signal conversion processing by performing FM modulation processing on the first line. Here, m and n are natural numbers.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a circuit block diagram showing an embodiment of a recording processing apparatus according to the present invention. C
A subject image is formed on the CD 1 by an optical system (not shown), and video data is output. The video data is converted into a digital signal by the A / D converter 2,
Is accumulated in The external RAM 3 is a storage unit 3 for two frames.
a, 3b, and 1 of the video data from the A / D converter 2.
The fields are stored in the first storage unit 3a. The video data accumulated in the first storage unit 3a is equivalent to four vertical lines ×
The data is transferred to the internal RAM 5 in units of m horizontal block data.

The digital arithmetic unit 4 converts the first, second and third three lines × m horizontal data into four vertical lines × m horizontal block data transferred to the internal RAM 5. Then, access is made to the second, third and fourth three lines × m horizontal data to perform NTSC signal conversion digital processing as described later. The digital signal subjected to the NTSC signal conversion is stored in the second storage unit 3b, converted into an analog signal by the D / A converter 6, and recorded on the recording medium 8 by the recording circuit 7.

FIG. 2 is a diagram for explaining a method of transferring video data between the external RAM 3 and the internal RAM 5.
In one field stored in the external RAM 3, the data block a ₁₁ of 4 vertical lines × m horizontal lines from the upper left is first transferred to the internal RAM 5. When digital processing is completed for this data block, this data is transferred to the second storage block 3b. Then transfers the data blocks a ₁₂ contiguous to the right, will perform the same processing, the processing proceeds to the final portion or the data block a _1p of the line, it continued third, fourth, fifth The same processing is performed by transferring the sixth vertical 4 lines × m horizontal pixels to the internal RAM 5. In this way, digital processing is performed on one field up to the data block a _qp and transferred to the second recording unit 3b.

FIG. 3 is a flowchart for explaining the storage processing operation according to the present invention. First, initial settings such as resetting each circuit are performed (S301). CCD
The output of 1 is digitally converted by the A / D converter 2, one field is stored in the first storage unit 3 a of the external RAM 3, and further, 4 vertical lines × m horizontal data blocks are transferred to the internal RAM 5. (S302). The digital arithmetic unit 4 stores the first three data blocks from the internal RAM 5.
Read lines, performs color signal processing and luminance signal processing (Y _n lines, even lines n). Further, the next three lines are read, and color signal processing and luminance signal processing are performed (Yn _{+ 1} line, odd line (n + 1)). This is baseband processing for two lines (S303).

Then, the odd line data is saved in the second storage section 3b of the external RAM 3 without performing the FM modulation processing (S304). The signals subjected to the baseband processing of the even-numbered lines are subjected to FM modulation processing,
3 is transferred to the second storage unit 3b (S305, S30).
6). Next, it is determined whether the processing of the luminance signal for one line has been completed (S307). If the processing of the luminance signal for one line has not been completed, the process returns to S302, and the next consecutive data blocks of 4 vertical lines × m horizontal data blocks are transferred to the internal RAM, and the same processing is performed (S302 to S3).
06). When the processing of the luminance signal for one even line is completed in this way, the data of one odd line is transferred from the second storage unit 3b to the internal RAM 5, and FM-modulated by the digital calculator 4 (S308). As described above, the FM modulation is performed for each data block for the even lines, and the FM modulation for one line is performed after the FM modulation for one even line is performed for the odd lines.
This is because FM modulation requires that signals be continuous in time, and that processing must be performed sequentially from the signal at the top of the screen.

Next, it is determined whether or not the processing has been completed up to the last line of the luminance signal (S309). If the processing has not been completed up to the last line of the luminance signal, the process returns to S302, and the next four vertical lines × The horizontal m data blocks are transferred to the internal RAM 5, and the same processing is performed. When the processing is completed up to the last line of the luminance signal of one field in this way, the NTSC signal conversion processing ends, and the operation shifts to an operation of recording on a recording medium. When processing the luminance signal of the first line and the luminance signal of the last line, since one line of the data block is missing, in this case, the same line is overlapped and processed.

[0012]

As described above, according to the present invention, the external R
Digital processing is performed in which four lines of the video data of one field stored in the AM are transferred to the internal RAM, and a luminance signal for two lines is created and FM-modulated by one transfer of the internal RAM. Therefore, although the internal RAM space is small, there is an effect that the efficiency of digital processing for converting to an NTSC signal is improved and the processing time can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a storage processing device according to the present invention.

FIG. 2 is a diagram for explaining a method of transferring video data between an external RAM 3 and an internal RAM 5;

FIG. 3 is a flowchart for explaining a storage processing operation according to the present invention.

FIG. 4 is a diagram for explaining a processing method in a conventional internal RAM.

FIG. 5 is a flowchart for explaining a conventional storage processing operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... CCD 2 ... A / D converter 3 ... External RAM 3a ... First storage part 3b ... Second storage part 4 ... Digital arithmetic unit 5 ... Internal RAM 6 ... D / A converter 7 ... Recording circuit 8 ... Recording medium

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 9/04-9/11 H04N 9/44-9/898 H04N 5/225 H04N 5/76-5 / 956

Claims (1)

(57) [Claims] 1. After accumulating data from a CCD in an external RAM, transferring the data to an internal RAM of a digital arithmetic unit, performing an NTSC signal conversion process by performing an operation in the digital arithmetic unit, and then transferring the data to the external RAM. In the recording processing apparatus for recording on the recording medium, the first block data of 4 vertical lines × m horizontal blocks is transferred from the external RAM to the internal RAM, Color signal processing and luminance signal processing are performed on the nth and (n + 1) th lines by the three lines
The FM modulation is performed on the nth line, the nth FM modulation data and the (n + 1) th baseband data are transferred to the external RAM, and then connected to the first block data in the horizontal direction. The same processing as the processing performed on the first block data is performed on the vertical 4 lines × horizontal m second block data. Thus, the third block data and thereafter, the n-th line The same processing is performed up to the last block data, and then the (n + 1) -th line is subjected to FM modulation processing, so that the digital arithmetic unit performs NTSC signal conversion processing. . Here, m and n are natural numbers.