JP2001265632A - Reproducing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with an operation due to the error of identification data in a reproducing unit for identifying the kind of data by the identification data and automatically reproducing them. SOLUTION: In this reproducing unit for reproducing a storage medium storing video data, audio data and the identification data for identifying the kind of data, the propriety of reproduction is discriminated corresponding to the identification data, changeover to a demodulation function corresponding to each kind of the data inside the reproducing unit is performed, the reproduction is started and then, control for switching to another demodulation function and performing the reproduction again is performed depending on the discrimination result of reproduction output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for reproducing digital data such as video data and audio data.

[0002]

2. Description of the Related Art When reproducing a storage medium storing a plurality of types of digital data by using a reproducing apparatus for reproducing digital data such as video data and audio data,
The reproducing apparatus is provided with reproducing means corresponding to each type of digital data, identifies the type of digital data by an extension of a file name, and performs reproduction by switching the reproducing means according to the type of digital data to be reproduced.

[0003]

In a conventional reproducing apparatus,
If there is digital data with a file name that has an incorrect extension, if the extension is an extension that is identified as unreproducible, playback will be performed even if the file format is reproducible digital data. I couldn't. In order to cope with such a case, it is necessary for the operator to perform a reproduction operation or the like again after changing the extension of the digital data. With conventional playback devices, if there is digital data with a file name with an incorrect extension, or digital data of a different type depending on the playback device used even if the extension is the same, the extension is identified as playable. If the extension is used, even if the content is digital data that cannot be played back, playback will be started as it is, an incorrect playback signal will be output, or the operation of the playback device will be interrupted and stopped. There was something to do. As a countermeasure in the case where such reproduction is performed, it is necessary for the operator to check the reproduction state and perform an operation for performing reproduction again.

[0004]

According to a first aspect of the present invention, there is provided a reproducing apparatus for reproducing a storage medium in which digital data is stored together with identification data indicating the type of digital data. Reading means for reading the identification data together with the data; demodulating means having a demodulation function for each type of digital data, demodulating the digital data by switching the demodulation function based on the identification data read by the reading means; Identification data storage means for storing identification data indicating the type of data; identification data determination means for determining whether the identification data indicating the type of digital data is identification data stored in the identification data storage means; The input means for inputting an instruction and the identification data storage means store the identification data in the identification data storage means. Those having a control means for reproducing the digital data when there is an input from the input means without reproduce digital data by switching a demodulation function of demodulating means when it is determined that no identification data.

According to a second aspect of the present invention, there is provided a reproducing apparatus for reproducing a storage medium in which digital data is stored together with identification data indicating the type of digital data, wherein the identification data is read together with the digital data from the storage medium. Reading means, demodulating means having a demodulating function for each type of digital data, demodulating means for switching the demodulating function based on the identification data read by the reading means to demodulate digital data, and identification indicating the type of digital data demodulatable by the demodulating means Identification data storage means for storing data; identification data determination means for determining whether the identification data indicating the type of digital data is identification data stored in the identification data storage means; and a demodulation result of the digital data by the demodulation means. The demodulation result discriminating means for discriminating and the identification data by the discriminating data discriminating means. When it is determined that the data is not the identification data stored in the storage means, the digital data is not reproduced and the demodulation function of the demodulation means is switched to reproduce the digital data, and the demodulation result determination means determines that the demodulation result is incorrect. And control means for switching the demodulation function of the demodulation means to reproduce digital data.

According to a third aspect of the present invention, in the reproducing apparatus according to the first or second aspect, the identification data is an extension of a file name of the digital data.

According to a fourth aspect of the present invention, in the reproducing apparatus according to the first to third aspects, the storage medium reading means is a memory card reading means which is removable from the reproducing apparatus. is there.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a configuration of an embodiment of a reproducing apparatus according to the present invention. Video data and audio data stored as a file on a storage medium such as a memory card are read by a storage medium reading unit 1, demodulated (decoded) by a decoder 2, decoded by an output unit 3, and DA converted into an analog signal. The signal is output to the output terminal 4.

The operations of the storage medium read unit 1, decoder 2, and output unit 3 are controlled by a control unit 5 using a microcomputer.
Is controlled by The input unit 6 and the display unit 7 are connected to the control unit 5. The input unit 6 includes input keys for the user to perform operation inputs such as designation of video data and audio data to be reproduced, reproduction or termination of reproduction, and the like. The control unit 5 includes an identification data determination unit 5A, an identification data storage unit 5B,
An identification data switching unit 5C and a demodulation result determination unit 5D are provided.

[0010] Video data and audio data are stored as files in a storage medium. As a file name,
A file name format commonly used for computer data recording purposes, an 8-character file name and a 3-character extension. Use a character string in the format AAAAAAAA.BBB separated by (dots). The three-character extension is used to identify the type of data stored in file units. Extensions are, for example, MPG, MPEG Aud, which represents MPEG1 video files.
There is MPA that represents the audio part file of a still image with io audio. The control unit 5 determines the extension by the identification data determination unit 5A and adapts the decoder 2 having a plurality of demodulation functions for each data type to the type of data to be reproduced before reproduction. Switch to the demodulation function and perform demodulation suitable for the type of data.

FIG. 2 is a block diagram showing details of the decoder 2 and the control unit 5 in the configuration of this embodiment shown in FIG. The decoder 2 includes a decoder A2A, a decoder B2B, and a decoder C2C in order to switch the demodulation function according to the type of data, and switches the input from the storage medium reading unit 1 by the switch 2S. Demodulation is performed by a decoder adapted to the type of data, and output to the output unit 3. The switch 2S is controlled by the control unit 5. Here, the decoder 2 can select and implement two types of configurations. One is a circuit for each demodulation function according to the type of data, a decoder A2A, a decoder B inside the decoder 2.
2B, a decoder C2C and a switch 2S. The other is DSP (Digital Signal Pr
The function of the DSP is switched to the demodulation function of the decoder A2A, the demodulation function of the decoder B2B, and the demodulation function of the decoder C2C by using a program inside the DSP. The switching condition of the decoder A2A, the decoder B2B, and the decoder C2C described in the program fulfills the function of the switch 2S, and apparently has a function equivalent to the configuration in which the decoder A2A, the decoder B2B, and the decoder C2C are switched by the switch 2S. .

The identification data storage unit 5B stores an extension used as identification data, and a decoder A2A, a decoder B2B, and a decoder C2C for demodulation by each demodulation function of the decoder 2 in association with each other. Before reproduction, the identification data determination unit 5A reads the extension of the file name input from the storage medium reading unit 1 via the switch 2S, and stores the extension in the identification data storage unit in association with the read extension. Decoder A, decoder B or decoder C
The switch 2S is controlled so as to switch to. The data input from the storage medium reading unit 1 by the switch 2S is demodulated according to the type of data among the decoder A, the decoder B, and the decoder C, and is output to the output unit 4.

The identification data switching section 5C stores identification data indicating the type of data that can be demodulated by the decoder 2. The demodulation result determination unit 5D determines the demodulation result of the video data and audio data demodulated by the decoder 2.
The control unit 5 determines, based on the determination result of the demodulation result determination unit 5D,
If the demodulation can be performed correctly, the decoder 2 continues the demodulation as it is. If the demodulation cannot be performed correctly, the demodulation of the decoder 2 is stopped, and the identification data switching unit can demodulate the identification data to be demodulated. To the demodulation function (the demodulation function of the decoder A, the demodulation function of the decoder B, and the demodulation function of the decoder C) stored in the identification data storage unit 5B in relation to the other identification data. Switch 2 to restart demodulation.

FIG. 3 is a flowchart showing the operation of the apparatus of this embodiment shown in FIGS. When the power is turned on to the playback device, the operation starts (S1). When an instruction to start playback or the like is input from the input unit 6 (YES in S2), the control unit 5 starts.
Reads the file name instructed to be reproduced by the input unit 6 from the storage medium to the storage medium reading unit 1 together with the extension
(S3) When the reading is not performed normally (NO in S4), the reading of the identification data is repeated up to a predetermined number of times (for example, three times) preset in the control unit 5 (S7, S3). Is not read (NO in S4, Y in S7)
ES), a file error is displayed on the display unit 7 (S
8) Return to the process of waiting for input of an instruction such as reproduction start from the input unit 6 in S2.

If the file name is normally read together with the extension (YES in S4), the identification data discriminating section 5A
Compares the read extension with the extension stored in the identification data storage unit 5B to determine whether the file can be reproduced (S5). If the file is a reproducible file having an extension stored in the identification data storage unit 5B, the decoder A stored in the identification data storage unit 5B corresponding to the extension,
After switching the demodulation function of the decoder 2 to the decoder B or the decoder C (S6), reproduction is started (S11).

After the reproduction is started, the control unit 5 determines whether the data has been correctly reproduced by determining the data demodulated by the decoder 2 by the demodulation result determination unit 5D.
(S12). If it can be correctly reproduced (YE in S12)
(S), and continue playing until the file has been played (S
13, S14), and ends the reproduction (S15). If the next reproduction is to be performed, the process returns to the process of waiting for input of an instruction such as reproduction start from the input unit 6 in S2 (YES in S20). If the next reproduction is not to be performed (NO in S20), the process ends.
(S21).

After the start of the reproduction, if it is determined that the demodulation result has an error, that is, if it is determined that the reproduction is not correctly performed (NO in S12), the reproduction is stopped (S16), and the control unit 5
Determines whether all the demodulation functions of the decoder 2 corresponding to the switchable identification data stored in the identification data switching unit 5C have been switched (S17), and determines whether the demodulation function of the decoder 2 corresponding to the identification data that has not been switched yet. If there is (S
(NO at 17), the decoder 2 is switched to the demodulation function stored in the identification data 5B in association with the other identification data.
(S18), reproduction is started (S11). Even if the file extension is incorrectly added, this process does not require an operation to correct the file extension, and the reproduction can be attempted by switching the demodulation function of the decoder 2 on the spot. it can.

It is determined whether or not all of the demodulation functions of the decoder 2 corresponding to the switchable identification data stored in the identification data switching section 5C have been switched (S17), and if all reproduction has been completed (YES in S17). Then, a reproduction error is displayed on the display unit 7 (S19), and the process returns to S2 where the input unit 6 waits for an instruction to start reproduction or the like.

If the file does not have the extension stored in the identification data storage unit 5B, that is, if it is not a playable file (S5
Is NO), if there is an operation to start reproduction from the input unit 6 to forcibly perform reproduction (YES in S9), the control unit 5
Automatically from or by operation input from the input unit 6
The demodulation function of the decoder 2 is switched (S10), and reproduction is started (S11). After the start of the reproduction, the above-described processing after S12 is performed. This process can cope with the case where there is an error in the extension.

If the file does not have the extension stored in the identification data storage unit 5B, that is, if the file is not a reproducible file (S5
If the reproduction is not to be performed (NO in S9) and the next reproduction is to be performed, the process returns to the process of waiting for input of an instruction such as reproduction start from the input unit 6 in S2 (YES in S20). If the next reproduction is not to be performed (NO in S20), the process ends (S21).

In the above embodiment, the reproduction is started by operating the input unit. However, if the storage medium is already inserted into the reproducing apparatus when the power is turned on without operating the input unit, Alternatively, when the storage medium is first inserted into the playback device after the power is turned on, the control unit 5 may automatically start playback. In that case,
For example, reproduction is started from the first file according to the order of recording in the file or the arrangement order of the file names.
In the above embodiment, the identification data (extension) is read for each file to be reproduced. However, before the reproduction, the identification data of all the files stored in the storage medium is read in advance and stored in the control unit 5. The configuration may be implemented in advance.

According to the reproducing apparatus of this embodiment, when the reproduction of a plurality of types of video data and audio data stored in the storage medium is determined based on the file name extension based on the extension of the file name, the video is reproduced. When playback that does not match the type of data, audio data, or the like is performed, playback can be automatically stopped, and the decoder can be switched to perform playback that matches the type of video data, audio data, or the like.

[0023]

According to the reproducing apparatus of the present invention, it is possible to determine the reproduction output due to an error in the identification data, switch the demodulation function, and reproduce the data.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of an embodiment of the reproducing apparatus of the present invention.

FIG. 3 is a flowchart showing the operation of one embodiment of the playback device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Storage medium readout part 2 ... Decoder 3 ... Output part 4 ... Output terminal 5 ... Control part 6 ... Input part 7 ... Display part

Continued on the front page F term (reference) 5B072 AA02 BB00 CC02 CC39 GG07 GG09 HH05 HH11 MM11 5B076 AB09 AB18 CA01 5B082 DC12 EA09

Claims (4)

[Claims] 1. A reproducing apparatus for reproducing a storage medium in which digital data is stored together with identification data indicating the type of the digital data, a reading means for reading the identification data together with the digital data from the storage medium, Demodulation means for demodulating digital data by switching the demodulation function based on the identification data read by the reading means, and identification data storage for storing identification data indicating a type of digital data that can be demodulated by the demodulation means. Means, identification data determination means for determining whether the identification data indicating the type of digital data is identification data stored in the identification data storage means, input means for inputting a reproduction start instruction, and identification data determination means. Means for determining that the data is not identification data stored in the identification data storage means A reproducing apparatus comprising: a control unit that reproduces digital data by switching a demodulation function of the demodulation unit when an input is received from the input unit without reproducing digital data when the digital data is input. 2. A reproducing apparatus for reproducing a storage medium in which digital data is stored together with identification data indicating a type of the digital data, a reading unit for reading the identification data together with the digital data from the storage medium, Demodulation means for demodulating digital data by switching the demodulation function based on the identification data read by the reading means, and identification data storage for storing identification data indicating a type of digital data that can be demodulated by the demodulation means. Means, identification data determining means for determining whether identification data indicating the type of digital data is identification data stored in the identification data storage means, and demodulation result determination for determining a result of demodulation of digital data by the demodulation means Means, and the identification data storage means by the identification data determination means. If it is determined that the data is not the identification data stored in the stage, the digital data is not reproduced and the demodulation function of the demodulation means is switched to reproduce the digital data, and the demodulation result determination means determines that the demodulation result is incorrect. A reproducing apparatus comprising: control means for reproducing digital data by switching a demodulation function of the demodulation means in such a case. 3. The reproducing apparatus according to claim 1, wherein the identification data is an extension of a file name of the digital data. 4. A reproducing apparatus according to claim 1, wherein said storage medium reading means is a memory card reading means detachable from said reproducing apparatus.