JP3116382B2 - Recording device and recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus and a recording / reproducing apparatus.
More specifically, the apparatus converts a sequence of digital data between a first format (for example, a display format for displaying an image) and a second format (for example, a recording format on a recording medium). The present invention relates to a recording device and a recording / reproducing device having the function of performing

[0002]

2. Description of the Related Art In recent years, devices for digitally transmitting and digitally recording and reproducing image data have been developed, and image transmission without S / N deterioration and recording and reproduction without a change over time have been realized. Such digital image processing apparatuses usually include at least one image data to be input / output or to be processed.
A data memory capable of storing the screen portion is provided.
Examples of formats for handling image signals include a display format (or a reference input / output format) in which pixel signals (and video synchronization signals) are arranged in the scanning direction, such as a monitor output or a camera input, a recording format of a magnetic recording medium, There are transmission / reception formats according to individual transmission rules of the transmission path. When transmitting or recording an image, data is shuffled, an error correction code is added, and a data block is also added with a synchronization code SYNC, an identification code ID, and the like. FIG. 2A shows a format (basic format) in which each pixel data is arranged in the order of horizontal scanning and vertical scanning, and FIG. 2B shows a recording format of a magnetic tape in a digital VTR. FIG.
The basic format shown in (A) corresponds to horizontal / vertical scanning on a video monitor.

A digital image processing apparatus is usually provided with a data memory for temporarily storing image data to be processed. In a conventional digital image processing device, an input / output circuit,
Circuit blocks such as a recording / reproducing circuit and a data memory are connected by a bus, and a circuit configuration that can commonly use one data memory is adopted. One such digital image processing device is a digital video tape recorder (VTR).

FIG. 6 is a block diagram showing the basic structure of a conventional digital VTR. 10 is a transmission line such as a public telephone line network or a digital line network, a TV camera, an image monitor device,
An input / output terminal connected to a transmission line interface device or the like, 12 is an input / output circuit including an A / D converter, a D / A converter, and a predetermined interface circuit, and 14 is
A recording / reproducing processing circuit for digitally recording image data on the magnetic tape 16 and reproducing a signal recorded on the magnetic tape 16 is provided with error correction coding of outer code and inner code accompanying recording / reproduction. An encoding / decoding circuit 20 for decoding data 20 used for recording / reproduction by the recording / reproduction processing circuit 14, error correction encoding / decoding by the encoding / decoding circuit 18, and input / output processing by the input / output circuit 12. The memory 22 is a circuit 12, 14, 18, 20
Is a data bus that connects to each other. FIG. 7 shows exchange of image data in this configuration.

[0005]

In the above conventional example, FIG.
As can be seen from the figure, reading and writing of data memory via one data bus cannot be performed at the same time, reading and writing frequently occur, and access and access of the data bus and data memory are not performed.
There is a problem that the rate increases. In particular, when a video signal is processed in real time, a higher processing speed is required.

Further, when reading / writing of the same data memory is performed in different formats such as a basic format and a recording format, management or control of the memory address becomes complicated. To facilitate this, all the processing circuits connected to the data bus must be individually provided with a memory address generation circuit corresponding to the corresponding format, so that the scale of the circuit cannot be avoided. .

An object of the present invention is to provide a recording apparatus and a recording / reproducing apparatus which solve such a problem.

[0008]

A recording apparatus according to the present invention is an apparatus for recording image data on a recording medium, and is connected to a first data bus and has a first format of an image in an input order. Input processing means for inputting data;
A first memory connected to the first data bus and configured to store image data in the first format input from the input processing unit via the first data bus; and a first memory connected to a second data bus. A second memory for storing image data in a second format according to a recording format on the recording medium; and a second memory connected to the second data bus and via the second data bus. recording means for recording on the recording medium by more reads the image data of the second format, said first data
Reading the image data of the first format from the first memory via a bus and converting the format from the first format to the second format
And the format through the second data bus.
Transfer means for writing the image data with the converted mat into the second memory. In the present invention
Such a recording / reproducing apparatus records image data on a recording medium.
A device for recording and reproducing data, the device being connected to a first data bus.
Input the image data of the first format according to the input order.
Input processing means connected to the first data bus.
From the input processing means via the first data bus.
And stores the input image data of the first format.
Connected to a first memory and a second data bus,
Second format according to the recording format on the recording medium
A second memory for storing the image data of the
Connected via the second data bus.
The image in the second format from the second memory
Recording means for reading data and recording the data on the recording medium
Connected to the second data bus and connected to the recording medium.
When reproducing the image data of the second format from
To the second memory via the second data bus.
Playback means, and input
The first format stored in the first memory;
The image data is read out and the format is
From the format to the second format before
Writing to the second memory, and
The second format reproduced and stored in the second memory.
Format image data and read the format
From the second format to the first format
Transfer means for converting and writing into the first memory
It is characterized by that.

[0009]

According to the above means, one memory is accessed in basically the same format, and management of memory addresses is simplified. Since the number of memory accesses is relatively small, the access rates of the memory and the bus can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention applied to a digital VTR. A plurality of circuits 30 perform image data processing in a basic format.
, 30-2,..., 30-N, 32 is an input / output processing block 30 via a data bus 34 and an input / output memory for inputting / outputting data in a basic format. is there. The data bus 34 is connected to each of the circuits 30-1, 30-2,.
., 30-N and the input / output memory 32 are connected by a bus.

Reference numeral 36 denotes one or more circuits 36-1 and 36- which perform recording / reproduction processing of image data in a recording format.
2,..., 36-M recording / reproduction processing block;
Reference numeral 38 denotes a recording / reproducing memory for inputting / outputting data in a recording format with a recording / reproducing processing block 36 via a data bus 40. The data bus 40 is connected to each of the circuits 36-1, 36-2,.
6-M and the recording / reproducing memory 38 are connected by a bus.

The input / output memory 32 and the recording / reproducing memory 38 are connected by a data transfer circuit 42.
The data transfer circuit 42 transfers the data stored in the input / output memory 32 to the recording / reproduction memory 38 by generating the read address of the input / output memory 32 and the write address of the recording / reproduction memory 38 in association with each other. By storing the data in the recording format and conversely, generating the read address of the recording / reproducing memory 38 and the write address of the input / output memory 32 in association with each other, the data stored in the recording / reproducing memory 32 can be stored in the input / output memory 32. And store it in the basic format. Thus, format conversion is performed. FIGS. 2A and 2B show the relationship between the recording format and the basic format.

FIG. 3 is a block diagram showing the basic circuit configuration of a digital VTR to which the embodiment shown in FIG. 1 is applied. The same circuit elements as those in FIG. 1 are denoted by the same reference numerals. 30r, 30
An input / output processing circuit b performs input / output processing of color signals. 4
Reference numeral 4 denotes an input / output processing circuit which converts an input video signal into luminance Y and chromaticity Pr, Pb, and inputs Y, Pb, P
r is converted into a form suitable for display on a monitor, for example. Reference numeral 46 denotes an error correction encoding / decoding circuit for correcting an error accompanying recording / reproduction, and 48 denotes a magnetic tape as a recording medium.

At the time of recording, the analog luminance signal Y and the chromaticity signals Pr and Pb output from the input / output processing circuit 44 are
The input / output processing circuits 30, 30r, 30b respectively convert and encode the digital signals. Input / output processing circuit 30,
The digital outputs of 30r and 30b are written to the input / output memory 32 via the data bus 34 in the order of the basic format. Data shuffling is performed on the input / output memory 32 as necessary. At a predetermined timing, the data transfer circuit 42 reads data stored in the input / output memory 32 and transfers the data to the recording / reproducing memory 38.
Image data is stored in the recording / reproducing memory 38 in a data order according to a recording format.

The encoding / decoding circuit 46 includes a data bus 40
The recording / reproducing memory 38 is accessed via the
Error correction coding is performed on the memory 20. After the error correction coding, the recording / reproducing processing circuit 36 operates the recording / reproducing memory
Read data in the order of the data in the recording format,
A synchronization code SYNC and an identification code ID are added, a predetermined modulation is performed, and the result is recorded on the magnetic tape 48.

FIG. 4 shows the relationship between the data formats from the input / output processing circuits 30, 30r, 30b to the data bus 34 and from the data bus 40 to the recording / reproducing processing circuit 36, and changes with time t. The circuit 30 and the circuits 30r and 30b have different data input / output rates depending on the difference in the signal band. Therefore, it is convenient to write data to the memory via the data bus 34.

At the time of reproduction, the following operation is performed. The recording / reproducing processing circuit 36 reproduces data reproduced from the magnetic tape 48 in accordance with the recording format, and writes the reproduced data to the recording / reproducing memory 38 via the data bus 40 in accordance with the synchronization code SYNC and the identification code ID. The encoding / decoding circuit 46 accesses the recording / reproducing memory 38 via the data bus 40, and performs error correction on the recording / reproducing memory 38 using the error correction code applied at the time of recording. The data transfer circuit 42 reads the existing data from the recording / reproducing memory 38 and stores it in the input / output memory 32 in a basic format. Or, at the time of recording,
If shuffling, the input / output memory 32
Is temporarily stored in the format of the shuffled data order, and then converted to the basic format by an address operation (or is read to the data bus 34 in the basic format when reading to the data bus 34). . Thereafter, the image data stored in the input / output memory 32 is read out to the data bus 34 in the order of the basic format, converted into an analog signal by the input / output circuit 30, and sent from the input / output terminal 44 to the external monitor device. And so on.

As can be seen by comparing FIG. 4 showing the data flow relating to the present embodiment with FIG. 7 showing the data flow of the conventional example, in the present embodiment, the access rates of the buses 34 and 40 are set to The access rate of the bus 22 can be made lower. In addition, since the format of data flowing through each bus is unified, memory address management is simplified.

Although the data transfer circuit 42 is directly connected between the two memories 32 and 38 in the embodiment shown in FIGS. 1 and 3, a data transfer circuit may be connected between the buses 34 and 40. FIG. 5 shows a configuration block diagram of the modified embodiment.
The same circuit elements as those in FIG. 1 are denoted by the same reference numerals. That is,
The data transfer circuit 50 accesses the input / output memory 32 via the data bus 34, accesses the recording / reproduction memory 38 via the data bus 40, and transfers data from the memory 32 to the memory 38 and vice versa. Transfer and format conversion.

Also in the configuration of FIG. 5, the access rates of the memory and the bus can be reduced, and the memory address management can be simplified. Also, the configuration of FIG. 1 and the configuration of FIG. 5 may be mixed, and a data transfer circuit may be connected to one of the memories 32 and 38 via a bus and directly connected to the other.

In the above embodiment, a digital image recording apparatus has been described as an example. However, the present invention is not limited to such an apparatus, but can be applied to other apparatuses such as an optical filing apparatus and an image data transmission apparatus.

[0023]

As can be easily understood from the above description, according to the present invention, the access rate of the memory and the data bus can be reduced. Further, since the format of the data transmitted through the bus is unified, there is an advantage that the address management of the memory is simplified, and the circuit scale can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an embodiment of the present invention.

FIG. 2 is an example of two types of transmission formats.

FIG. 3 is a digital VTR incorporating the embodiment of FIG. 1;
FIG. 2 is a schematic configuration block diagram of FIG.

FIG. 4 is an explanatory diagram of a data flow at the time of recording in FIG. 3;

FIG. 5 is a configuration block diagram of a modified embodiment of FIG. 1;

FIG. 6 is a configuration block diagram of a conventional example.

FIG. 7 is an explanatory diagram of a data flow of a conventional example.

[Explanation of symbols]

30: I / O processing block 32: I / O memory 3
4: Data bus 36: Recording / playback processing block 3
8: Memory for recording and reproduction 40: Data bus 42: Data transfer circuit 44: Input / output terminal 46: Error correction encoding / decoding circuit 48: Magnetic tape

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 20/12 103 H04N 5/782 H04N 5/91-5/956

Claims (14)

(57) [Claims] 1. An apparatus for recording image data on a recording medium, comprising: an input processing unit connected to a first data bus, for inputting image data of a first format according to an input order; A first memory for storing image data of the first format input from the input processing means via the first data bus, and a first memory for storing image data of the first format; A second memory for storing image data in a second format according to a recording format on a recording medium; and a second memory connected to the second data bus, the second memory being connected to the second memory via the second data bus. recording means for recording on the recording medium by reading the image data of the second format, of the said via a first data bus said from the first memory first format Read image data, and converts the second format that format from the first format, said second data bus
And a transfer unit for writing the converted image data into the second memory via the second memory. 2. The second data bus, which is connected to the second data bus, reads out the image data of the second format via the second data bus, performs error correction coding, and performs error correction coding. Error correction processing means for writing image data in a format to the second memory via the second data bus, wherein the recording means has a function of the second format which is error-correction-coded by the error correction processing means. The recording apparatus according to claim 1, wherein image data is recorded on the recording medium. 3. A reproducing means connected to the second data bus, for reproducing the image data of the second format from the recording medium and writing the image data in the second memory via the second data bus. The error correction processing means further comprises: a second data bus for reading out the image data of the second format reproduced by the reproduction means and written in the second memory, and performing an error correction decoding process. 3. The recording apparatus according to claim 2 , wherein the image data of the second format subjected to the error correction decoding processing is written to the second memory via the second data bus. 4. The transfer means further performs an error correction decoding process by the error correction processing means, reads out image data in a second format written in the second memory, and converts the format into the second format. 4. The recording apparatus according to claim 3 , wherein the format is converted into the first format and written in the first memory. 5. 5. A reproducing means connected to the second data bus, for reproducing the image data of the second format from the recording medium and writing the image data in the second memory via the second data bus. The transfer means further reads image data of the second format reproduced by the reproduction means and written to the second memory, and changes the format from the second format to the first format. 2. The recording apparatus according to claim 1, wherein the data is converted and written into the first memory. Wherein said input processing means further said transfer means by the first of the image data of the first format is written in the memory the first data <br/> read via the bus output The recording apparatus according to claim 5 , wherein the recording is performed. 7. The method according to claim 7, wherein the recording medium is a magnetic tape.
The recording device according to claim 1, wherein 8. Recording and reproduction of image data on a recording medium
Device for performing A first data bus connected to the first data bus and following an input order;
Input processing means for inputting image data of A first data bus connected to the first data bus;
The first file input from the input processing means via the
A first memory for storing image data in a format; A recording file on the recording medium is connected to the second data bus.
Record image data in the second format according to the format
A second memory to remember, A second data bus connected to the second data bus;
Through the second From the memory, the second format
Read out the image data of the target and record it on the recording medium
Recording means; Connected to the second data bus and from the recording medium
Play back the image data of the second format and
Writing to the second memory via a second data bus
Reproducing means; The data is input by the input processing means and written in the first memory.
Reads the stored image data of the first format
And the format is changed from the first format.
Converted to the second format and written to the second memory.
At the same time as the second
Image data of the second format stored in a memory
The second format.
From the first format to the first format.
Transfer means for writing to the memory.
Recording and playback device. 9. The first data bus according to claim 1, wherein
Without the intervention of the first format from the first memory.
Read out the image data of the second data
Image data whose format has been converted without passing through
Is written to the second memory.
9. The recording / reproducing apparatus according to 8. 10. The data transfer means according to claim 1, wherein:
From the first memory through the first format
Read out the image data of the second data
The converted image data via the
9. The method according to claim 8, wherein the data is written to the second memory.
The recording / reproducing apparatus according to claim 1. 11. A data bus connected to the second data bus,
The second format is connected via a second data bus.
Reads image data and encodes it for error correction to correct errors
The positively encoded image data of the second format is
Writing to the second memory via a second data bus
Error correction processing means, wherein the recording means
The second format, which has been error-correction encoded by the correct processing means,
Recording the image data of the format on the recording medium.
The recording / reproducing apparatus according to claim 8, wherein 12. The error correction processing means further comprises:
Reproduced by the raw means and written in the second memory
The image data of the second format is transferred to the second Day of
Read through the tabus and perform error correction decoding.
The second format after the error correction decoding process has been performed.
Image data of the
12. The method according to claim 11, wherein the data is written to the second memory.
Recording and playback device. 13. The input processing means further comprises:
The first memory written to the first memory by the first stage;
Format image data via the first data bus.
9. The method according to claim 8, wherein the data is read out and output.
Recording and playback device. 14. The recording medium is a magnetic tape.
The recording / reproducing apparatus according to claim 8, wherein: