JPH10133700A - Recording method of compression coded data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate memory control and improve the efficiency in the use of memory when recording voice/video signals to memory together with control data. SOLUTION: Voice/video signals are converted to digital signals by an AD converter 1. This digital signal is compression-coded by a coder 2 to obtain coded packet data in a packet form. Prior to recording this data, control data of the data number, sampling rate, etc., relating to the coded data are generated as the control packet data in the form identical to coded data by a control data preparing section 4 to continuously record relating coded data in memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording an audio or video signal on a recording medium such as a memory.
The present invention relates to a method for recording management data.

[0002]

2. Description of the Related Art Generally, in order to record an audio or video signal on a recording medium such as a memory, first, the audio or video signal is converted into an analog signal.
The digital signal is converted by the conversion, and the digital signal is compression-encoded and stored in the memory. At this time, it is necessary to record in a memory a data number for managing a series of compression-encoded data, a sampling rate for AD conversion, a bit rate for compression encoding, and the like as management data.

Therefore, conventionally, an information area for recording management data is provided in advance in a part of a memory for recording, and when encoding data is recorded, the management data is separately recorded in this information area. Alternatively, a method of recording management data in each packet data (encoded data) at the time of encoding has been adopted.

[0004]

In the conventional recording method, in the former method, since an information area is provided in advance for management data, an unused area in the information area may be a useless area. And the memory cannot be used efficiently. Furthermore, since the encoded data and the management data are recorded in different areas, the operation is complicated when data is erased, which is not preferable in terms of memory management.

On the other hand, in the latter method, the management of the memory is simplified because the management data is recorded in the packet data. However, since the management data is duplicated in each packet data, the original management data is recorded. There is a problem that the capacity for recording encoded data is reduced.

[0006]

According to the present invention, an original signal such as an audio or video signal is AD-converted into a digital signal, and the digital signal is compression-encoded to obtain encoded data in packet format. In the method of recording on a recording medium, management data related to the encoded data is generated as packet data of the same format as the encoded data, and is recorded on the recording medium continuously with the associated encoded data. It is characterized by having done.

Further, the present invention is characterized in that the management data includes a sampling rate during the AD conversion or a bit rate during the compression encoding.

[0008]

FIG. 1 is a functional block diagram showing an embodiment of the present invention. An audio or video signal is converted into a digital signal by an AD converter 1, and the digital signal is converted by an encoder 2. The data is compression-encoded to generate n-byte encoded packet data. Then, the encoded packet data is sent to the selector 3.

On the other hand, various management information such as a data number, a sampling rate at the time of A / D conversion, and a bit rate at the time of compression / encoding are converted into n-byte management packet data of the same format as the encoded packet data by the management data creating unit 4. It is created and sent to the selector 3. In the case of packetization, an identification code is attached so that management data can be distinguished from encoded data at the time of reading. As this identification code, a digital value that cannot exist in audio or video compression encoding is selected.

The management packet data is created prior to the recording of the audio or video signal.
, The selector 3 first selects management packet data, and the selected management packet data is written to the n-byte block memory 6. The data in the block memory is block-transferred to the memory 7 as a recording medium under the control of the memory management control unit 5, and the management packet data is recorded in the memory 7.

After the management packet data is recorded in this way, the selector 3 selects the coded packet data sequentially transmitted from the encoder 2, and these are sequentially written to the block memory 6 and transferred by the block transfer. Memory 7
, Coded packet data is sequentially recorded. as a result,
In the memory 7, as shown in FIG. 2A, management packet data is recorded first, followed by a series of encoded packet data. Since the management packet data and the encoded packet data are data of the same packet format, the memory management control unit 5 can execute recording by the same memory management regardless of the type of data.
Similarly, simple memory management is possible for erasing.

That is, the state of the memory 7 shown in FIG. 2A is as follows. First, the management packet data 1 of the first data string is recorded, and the encoded packet constituting the first data string is continuous with the management packet data 1. Data 1-1 to 1-4 are recorded, and then the management packet data 2 of the second data string is recorded. The encoded packet data 2- which constitutes the second data string continuously to the management packet data 2 1-2 are stored, and the management packet data 3 of the third data string is further stored.
Is recorded, and the third
Encoded packet data 3-1 to 3- constituting a data sequence
3 indicates a state where the information is recorded.

In this state, if the sixth through thirteenth packets from the beginning are erased, all the second and third data strings can be erased as shown in FIG. 2B. Management packet data 1 of the fourth data string and encoded packet data 4-1 to 4-1 constituting the fourth data string
If -7 is recorded, a fourth data string is recorded following the first data string as shown in FIG. 2c.

Here, the management data is handled as the same packet data as the encoded data.
Each block area in which the packet is recorded becomes a recording area for management data or a recording area for encoded data as necessary. For example, the area where the management packet data 1 is recorded in FIG.
In c, encoded packet data 4-4 is recorded.

As described above, data can be recorded. Reproduction, that is, reading is performed as follows. As shown in FIG. 1, a data discriminator 8 is connected to the block memory 6, and the packet data read from the memory 7 is controlled by the memory management control unit 5 via the block memory 6. 8 is input. The identification code is added to the management packet data by the management data creation unit 4 at the time of recording. Therefore, the data discriminator 8 judges whether the input packet data is the management data or the encoded data by judging the identification code. can do. Here, the packet data determined to be the management packet data is input to the management data decomposing unit 9 and is changed from the packet format to the normal data format.
Various management information is output.

On the other hand, the encoded packet data is supplied to the decoder 1
0, where it is decompressed and decoded, and further converted by a DA converter 11 into an analog audio or video signal and output. As described above, the reproducing operation is realized. Incidentally, the block diagram shown in FIG. 1 shows a functional configuration, and the actual hardware configuration is shown in FIG.
It can be realized by the configuration shown in FIG. This example shows a configuration of a voice recording apparatus using a removable memory card 20 as a memory 7, and includes an encoder 2 and a decoder 10 shown in FIG.
Is a DSP 21, and the management data creation unit 4, management data decomposition unit 9, selector 3, data discriminator 8, and memory management control unit 5 are realized by a microcomputer 22 by software processing. The SRAM 23 is shown in FIG.
Corresponds to the block memory 6.

[0017]

According to the present invention, since the management data is the same packet data as the encoded data, the memory management becomes easy, and the redundant recording of the management data and the useless unused area are eliminated. It can be used efficiently.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram showing a recording state of a memory in the embodiment.

FIG. 3 is a block diagram showing a hardware configuration of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A / D converter 2 Encoder 3 Selector 4 Management data creation part 5 Memory management control part 6 Block memory 7 Memory 8 Data discriminator 9 Management data decomposing part 10 Decoder 11 DA converter 20 Memory card 21 DSP 22 Microcomputer 23 SRAM

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Claims (2)

[Claims] 1. A method for converting an original signal such as an audio or video signal into a digital signal by A / D conversion, compressing and encoding the digital signal to obtain encoded data in a packet format, and recording the encoded data on a recording medium. Compression code, wherein management data related to the encoded data is generated as packet data in the same format as the encoded data, and is recorded on the recording medium continuously with the encoded data related to the encoded data. Method of recording coded data. 2. The method according to claim 1, wherein the management data includes a sampling rate at the time of the AD conversion or a bit rate at the time of the compression encoding.