JP2000276851A - Digital data reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital data reproducing device capable of retrieving and reproducing a recording block, where desired data are recorded, in a short time when a special reproducing mode such as fast forward or review during reproduction is selectively inputted while using digital data recorded on a non- volatile memory card. SOLUTION: Concerning this digital data recording and reproducing device, recording area data are extracted from the management data of a file recorded on a recording medium, a regenerative bidirectional recording area list is prepared on the basis of these recording area data and stored in a RAM 11, the destination of skip at the special reproduction is retrieved from the regenerative bidirectional recording area list stored in the RAM 11, and the data on a non- volatile memory card 25 in this retrieved recording area are read out and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory card having a built-in nonvolatile semiconductor which digitally encodes and compresses various kinds of information and records the encoded and compressed digital data. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data reproducing apparatus for reproducing digital data recorded on a card, and particularly to a digital data reproducing apparatus capable of performing fast forward reproduction in a forward direction or a reverse direction when reproducing recorded time-series information. About.

[0002]

2. Description of the Related Art In recent years, the recording capacity of a nonvolatile semiconductor memory has been increased, and a large amount of data can be recorded. Digital still cameras and audio recording devices for recording still images have been developed and put to practical use by converting this non-volatile semiconductor memory into a card and using it as a recording medium instead of a silver halide film or a magnetic tape for recording audio.

[0003] The digital still camera and the audio recording device convert an analog signal generated and captured by a photographing camera or a microphone into a digital signal, and encode and compress the digital signal to convert the digital signal into data having a predetermined data format. In the nonvolatile semiconductor memory.

In the nonvolatile semiconductor memory, a data storage area is divided into a plurality of physical blocks for each predetermined data amount, and data recording or erasing can be managed for each physical block. In addition, the nonvolatile semiconductor memory generally employs a data format compliant with MS-DOS, which is an OS of a computer device, in order to enable reading and editing of recorded data in a computer device. .

[0005] The encoded and compressed recording data is converted into a data format of the MS-DOS by a microprocessor, and management file data of the recording data is created and recorded in a physical block of the nonvolatile semiconductor memory. Using the file management data, reading and erasing of recording data recorded in a plurality of physical blocks is performed.

A specific example of a digital data recording / reproducing apparatus using the nonvolatile semiconductor memory will be described with reference to FIG. FIG. 5 is a block diagram showing a configuration of a digital data recording / reproducing apparatus for audio.

An audio input circuit 21 of an audio digital data recording / reproducing apparatus 20 shown in FIG. 5 includes a microphone that collects sounds such as music and human voice to generate an analog electric signal and an analog generated by the microphone. It comprises an amplifier circuit for amplifying the audio signal. This voice input circuit 2
The analog audio signal generated in 1 is converted into a digital audio signal by an analog / digital conversion circuit (hereinafter, referred to as an A / D circuit) 22 and supplied to an encoding / compression circuit 23. The encoding and compression circuit 23 encodes the digital audio signal, performs data compression, and generates predetermined digital compressed data. The encoding and compression in the encoding and compression circuit 23 uses a compression technology of G729A of ITU (International Telecommunication Union) standard.

The digitally encoded compressed data generated by the encoding and compressing circuit 22 is transmitted via a microprocessor 24 to a card (hereinafter, referred to as a card) on which a nonvolatile semiconductor memory is mounted.
25 (referred to as a nonvolatile memory card). The microprocessor 24 controls writing and reading of the digitally encoded compressed data to and from the nonvolatile memory card 25, and also generates management data of the written digitally encoded compressed data.

The digitally encoded compressed data read from the nonvolatile memory card 25 under the control of the microprocessor 24 is expanded by a decoding and expansion circuit 26, decoded, and converted into a digital audio signal. It has become.

The digital audio signal generated by the decoding / expansion circuit 26 is converted into a digital / analog conversion circuit (hereinafter, referred to as a digital / analog conversion circuit).
The audio signal converted into an analog audio signal by the D / A circuit 27 is supplied to an audio output circuit 28 including an amplifier circuit and a speaker.

The microprocessor 24 includes an operation switch 29 having an operation switch for operating the digital data recording / reproducing device 20 for recording or reproducing sound or turning off the operation power supply. In addition, a liquid crystal display means 30 for indicating an operation state of the digital data recording / reproducing apparatus 20 is connected.

Incidentally, the nonvolatile memory card 25 includes:
The MS-DOS format is used so that the recorded data can be used by a computer device, and the digital data recording / reproducing device 20 can be attached to and detached from a card slot provided in a casing (not shown).

The A / D circuit 22, the encoding / compression circuit 23, the decoding / expansion circuit 26, and the D / A circuit 27
It is composed of a one-chip audio processing integrated device (hereinafter referred to as an audio processing IC) 31.

When data is recorded in the nonvolatile memory card 25 in the digital data recording / reproducing apparatus 20 having such a configuration, management of data files and recording blocks is performed based on the MS-DOS format by using directory entries or the like. FAT (File Allocation Table) management data is generated and recorded. Further, at the time of reproduction, desired file data is read based on the management data. While reproducing the digitally encoded compressed data based on the data recorded in the MS-DOS format,
A special playback mode such as a fast forward mode for playing back data that is earlier than the currently played data or a review mode for returning to already played data is provided by the operation switch 29.
Is selected, the microprocessor 24 needs to search for the fast forward and review destination recording block based on the management data recorded in the nonvolatile memory card 25.

On the other hand, the management data recorded on the non-volatile memory card 24 includes the recording order data of the recording block of the recorded predetermined digitally encoded and compressed data. A desired recording block search in the fast-forward mode can be easily performed by searching the recording blocks in the recording order.

However, in the review mode in which the currently reproduced recording block returns to the already reproduced recording block, a desired recording block is searched from the top position of the recording block indicating the recording order recorded in the management data. Will return to the desired recording block after the recording block is found.

Therefore, when a large amount of digitally encoded compressed data is used and a large number of recording blocks are used, it takes a long time to search for a desired recording block, particularly in the review mode.

[0018]

In a conventional digital data recording / reproducing apparatus, information progressing in a time series is converted into digitally encoded compressed data, recorded on a nonvolatile memory card, and the recorded digitally encoded data is reproduced. When a special playback mode such as fast forward or review is selected during the playback of the compressed data, it is necessary to search for the recording block position of the desired data from the management data recorded on the nonvolatile memory card. For this reason, particularly in the review playback mode, it is necessary to search for data indicating the recording block order of the management data recorded on the nonvolatile memory card from the top of the recording block to find a desired recording block. . In particular, when the review playback mode is entered during playback of the latter half of data using a large number of recording blocks, and data that has been returned a few recording blocks is played back, it is often necessary to search from the top recording block in the recording order. There was a problem that took time.

The present invention is directed to a recording block in which desired data is recorded in a short time when a special reproduction mode such as fast forward or review during reproduction is selected and input using digital data recorded on a nonvolatile memory card. It is an object of the present invention to provide a digital data reproducing apparatus capable of searching for and reproducing.

[0020]

According to the present invention, analog information which is converted into digitally encoded compressed data and progresses in a time series and management data including area information for recording the digitally encoded compressed data are recorded together. Digital data reproduction for reading out the recorded management data and the digitally encoded compressed data from the nonvolatile memory card, decoding and expanding the read digitally encoded compressed data, and reproducing as analog information proceeding in time series. A reproduction control means having a microprocessor means for controlling reading of the digitally encoded compressed data and management data recorded on the nonvolatile memory card; and a recording area for reading the management data of the nonvolatile memory card. Recording area extracting means for extracting information;
A list creation unit that creates a playback order recording area list based on the recording area information extracted by the recording area extraction unit; and a storage unit that temporarily stores the playback order recording area list created by the list creation unit. Including special reproduction for reproducing the digitally encoded compressed data recorded on the nonvolatile memory card at a higher speed than at the time of recording.
Input means for setting an operation mode of the playback device, wherein the playback control means, when a special playback mode is set by the input means, a playback forward recording area list stored in the storage means. And reading and reproducing desired digitally encoded compressed data from a recording area of the nonvolatile memory card based on the digital data.

According to the present invention, there is provided a nonvolatile memory in which analog information which is converted into digitally encoded compressed data and progresses in a time series and management data including area information for recording the digitally encoded compressed data are recorded together. A digital data reproducing device that reads the recorded management data and the digitally encoded compressed data from a card, decodes and expands the read digitally encoded compressed data, and reproduces the digitally encoded compressed data as time-series analog information. Reproduction control means having a microprocessor means for controlling reading of the digitally encoded compressed data and management data recorded on the nonvolatile memory card; and reading out management data of the nonvolatile memory card, and recording area information. Recording area information extracting means for extracting, and the recording area information extracting means List creation means for creating a playback bidirectional recording area list based on the extracted recording area information, storage means for temporarily storing the playback bidirectional recording area list created by the list creation means, and the nonvolatile memory card Input means for setting an operation mode of the reproduction apparatus, including a special reproduction mode for reproducing digitally encoded compressed data recorded at a higher speed than at the time of recording, and the reproduction control means comprises: And reading and reproducing desired digitally encoded and compressed data from the recording area of the nonvolatile memory card based on the reproduction bidirectional recording area list stored in the storage means when the special reproduction mode is set by A digital data reproducing apparatus characterized in that:

In the digital data reproducing apparatus according to the present invention, the reproduction control means measures an input time for setting the special reproduction mode when an input for setting the special reproduction mode is made by the input means. If the time is equal to or shorter than a predetermined time, the reproduction is skipped for each unit recording area of the recording area, and if the time is equal to or longer than a predetermined time, the reproduction is skipped for each of a plurality of recording areas of the recording area. , And controls to read digitally encoded and compressed data recorded on the nonvolatile memory card.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a digital data recording / reproducing apparatus according to the present invention. In addition. The same parts as those in FIG.

The difference between FIG. 1 and FIG. 5 is that a microprocessor 24 for controlling the transfer of data between the voice processing IC 31 and the non-volatile memory card 25 is provided with a forward list of recording areas, which will be described later, or both. List generation processing means for generating the
M11 is connected. The RAM 11 edits and stores management data read from the nonvolatile memory card 25 under the control of the microprocessor 24.

The list generation processing means of the microprocessor 24 will be described with reference to FIG.

FIG. 2A shows a nonvolatile memory card 25.
Is an explanatory diagram showing a directory entry in the MS-DOS format, which is composed of 32 bytes, and includes a file name, a FAT entry, a file size, and an extension;
It consists of a file attribute, a system reserve, a time, a date, and the like. The drawing shows other information other than the file name, the FAT entry, and the file size. In this directory entry, for example, the file name Chapter
It is assumed that the data of er01 starts from the cluster of the FAT entry 0002h and the file size is recorded as 64 Kbytes.

From the directory entry, it is shown that the data of the file name Chapter 01 is recorded from the FAT entry from the cluster number 2 and 64 Kbytes of data is recorded. Assuming that the data of 64 Kbytes of this file size has a storage capacity of 8 Kbytes per cluster (in the case of a non-volatile memory card of 8 Mbytes), it is divided and recorded into eight clusters. FAT for this file
2B, cluster number 2 is the top cluster at which data recording is started, and fat data indicating the next recording cluster is described in cluster number 2 of this top cluster. As shown in the figure, the top cluster 2 has fat data 3 and the cluster 3 has fat data.
The data 4 and the cluster 4 are described as fat data 100, etc., and the cluster 6 is described with the sign of FFFh as the fat data indicating the end cluster at which the file data ends. It can be determined that the data is recorded in the order of → 3 → 4 → 100 → 101 → 102 → 5 → 6.

When the digital data recording / reproducing apparatus 20 reproduces the digitally encoded compressed data having a desired file name in a normal reproduction mode, the microprocessor 24 reads out the microprocessor 24 based on the directory entry and the FAT entry of the designated file name. The data is read and reproduced by directly controlling the cluster of the nonvolatile memory card 25.
Therefore, in the special reproduction mode, as in the above-described conventional example, the microprocessor 24 re-reads the FAT recorded on the nonvolatile memory card 25 and searches for the fast-forward position and the review position. .

Then, when the reproduction mode is input by the operation switch 29 and the file name of the desired digitally coded and compressed data is designated, the list generation processing of the microprocessor 24 is performed prior to reading the data of the designated file name. Under the control of the means, the nonvolatile name memory card 2
5 is read, the directory entry and the FAT of the designated file name are read, and as shown in FIG. 2C, a reproduction order list from the top cluster to the end cluster where data is recorded is created, and the RAM 11 is read.
To temporarily memorize. Based on the reproduction order list stored in the RAM 11, the microprocessor 24 reads desired data from the non-volatile memory card 25, decodes and expands the data into a digital signal by the decoding and expansion circuit 26, and After being converted into an analog signal by the / A circuit 27, it is amplified by the audio output circuit 28 and output as sound from the speaker.

As described above, the microprocessor 24
For example, based on the reproduction order list temporarily generated in the RAM 11, the fast forward in the special reproduction mode is selected, and the currently reproduced cluster is set as the cluster number 3,
When the fast forward operation is input to the next cluster, the microprocessor 24 detects the cluster number 100 that is two cluster ahead of the cluster number 3 from the reproduction order list stored in the RAM 11 and The data recorded in the cluster number 100 of the memory card 25 can be read and skipped, and the data of the cluster number 100 can be reproduced and output.

When the review mode is selected and input, and the cluster currently being reproduced is set to the cluster number 100 and an operation to return to the previous cluster is input, the microprocessor 24 is stored in the RAM 11. A search is made in the forward direction from the top cluster number 2 in the reproduction order list, a cluster number 4 in which the fat data 100 is described is searched, and a search is made for the data recorded in the cluster number 4 of the nonvolatile memory card 25. , And the data of cluster number 4 can be reproduced and output.

The digital data recording / reproducing device 20 comprises:
Since the battery is produced in a small, lightweight and portable size, a dry battery is used as an operating power supply. For this reason, it is required to reduce the power consumption of the operation power supply. If a low power consumption microprocessor 24 is used, the processing speed is reduced. Sometimes, it takes time to search for a desired cluster number.

Therefore, as shown in FIG. 2D, a reproduction bidirectional list is generated and temporarily stored in the RAM 11, and based on the reproduction bidirectional list, a cluster to which a fast forward or a review reproduction mode is skipped is set. Make numbers searchable.

The reproduction bidirectional list is composed of the top cluster in the reproduction forward direction and fa of the end cluster in the reproduction reverse direction.
In the t data, the end cluster in the reproduction forward direction is replaced with the fat data of the top cluster in the reproduction reverse direction, and the middle cluster between the top cluster and the end cluster is replaced with the fat data of the previous cluster in the recording order of the own cluster. Create by replacing

Thus, in the fast forward mode of the special playback mode, the cluster number of the fast forward skip destination is searched based on the playback order list, and in the review mode,
By searching for the review skip destination cluster number based on the reproduction reverse direction list, it is possible to perform both special reproductions in a short time.

Next, the operation of the microprocessor 24 in the process of creating the both-playback list will be described with reference to the flowchart of FIG. 3 and the bidirectional list creation explanatory diagram of FIG.

The non-volatile memory card step 25 on which digitally encoded and compressed data is recorded is mounted on the digital data recording / reproducing apparatus 20 and an operation switch 29 is provided.
When the playback mode is input from the CPU, in step S1, the data of the directory entry and the FAT entry of the designated file of the nonvolatile memory card 25 are read,
The data is loaded into the RAM 11. Next, in step S2,
The cluster number described in the FAT entry of the directory entry is read, set as the top cluster number in the forward list, and in step S3, the top cluster number is set as the end cluster number in the reverse list. Next, in step S4, the fat data of the top cluster number in the forward direction is read. In step S5, the fat data read in step S4 indicates the end cluster, and the code FFFh is determined. That is,
As shown in FIG. 4A, the cluster number 2 is set as the top cluster number of the forward list, and the code FFFh indicating the end cluster of the backward list is set. It is determined whether the fat data of the top cluster number of the present FAT is the code FFFh indicating the end of the data. F in step S5
As a result of the determination of the at data, when it is determined that the data end code is FFFh, the file is returned in step S6 because only one cluster is used, and the file does not require special reproduction.

If it is determined in step S5 that the end code is not FFFh, in step S7, the cluster number 3 corresponding to the fat data 3 of the top cluster number 2 is saved as the end cluster in the forward list, and in step S8 the cluster Cluster number 3 is saved as the top cluster of the backward list corresponding to fat data 3 of number 2. Next, in step S9, the fat data 3 of the top cluster number 2 in the forward direction list determined in step 5 is saved, and in step S10, the cluster number 2 is saved.
The data of FFFh indicating the end cluster is saved as the fat data of the reverse direction list. As a result, in the forward list, the fat data in which the cluster number 2 is the top cluster and the next cluster is the cluster number 3 is saved, and in the backward list, the cluster number 2 is the end cluster and the FFFh is saved as the fat data. .

Next, in step S11, the above-mentioned step 7
Data 3 of cluster 2 saved from S10 to S10
And returns to step 5 above.
The cluster number 3 is read from the FAT data loaded in the RAM 11, and as shown in FIG.
Fh is determined, and in step S7, f
The cluster number 4 of the at data 4 is saved as the end cluster of the forward direction list, and the cluster number 4 of the fat data 4 of the cluster number 3 is saved as the top cluster of the reverse direction list in step S8.

Next, in step S9, the fat data 4 of the cluster number 3 in the forward list determined in step 5 is saved, and in step S10, 2 is saved as the fat data in the backward list of cluster number 3. . As a result, the fat data of the cluster number 4 of the next cluster is saved in the forward list of the cluster number 3,
The fat data of the next cluster number 2 is saved in the backward direction list. When this step S10 ends, in step S11 the fat data 4 of the cluster number 3
And returns to the step S5 again, and the cluster number 4 loaded in the RAM 11
Then, the fat data is read out, and the processing of steps S5 to S11 is performed to create a bidirectional list composed of a forward direction and a reverse direction as shown in FIG.

Thus, in the special playback mode described above, the skip destination cluster number is searched according to the forward direction list during fast forward playback based on the bidirectional list stored in the RAM 11, and during the review playback. Then, the skip destination cluster number is searched according to the reverse direction list, and the recorded data of the skip destination cluster can be instantaneously reproduced.

The operation switch 29 is provided in the special reproduction mode using the bidirectional list. It is also possible to read the time during which the fast-forward mode switch and the review mode switch (not shown) are pressed by the microprocessor 24, and to change the skip number of the cluster according to the time during which the switches are pressed. When the nonvolatile memory card is 8 Mbytes, audio data per cluster can be recorded for about 8 seconds. When the special playback mode switch is pressed for a short time within 2 seconds, for example,
By playing back the previous or returned cluster or, when pressed for more than 2 seconds, playing back from the currently playing cluster four or back from the current cluster, one by one or four Then, skipped fast-forward or review reproduction can be performed, and a cluster in which desired audio data is recorded can be searched in a short time.

As described above, according to the present invention, the directory entry and the FAT entry recorded on the nonvolatile memory card are temporarily loaded into the RAM under the control of the microprocessor, and the directory entry and the FAT entry are stored in the RAM. Using the FAT entry, a new forward play list is created and primary recorded in the RAM, and using this forward list, a cluster number of a skip destination at the time of trick play is searched. The data of the cluster number of the non-volatile memory card is read and reproduced based on the above, or a bidirectional list is created from the directory entry and the FAT loaded in the RAM, and based on the bidirectional list, the special reproduction is performed. When the skip destination cluster number is searched, the microprocessor that performs data processing Slow processing speed, even using less processor power consumption, desired skipping cluster becomes searchable in a short time. Furthermore, by setting the number of clusters to be skipped according to the pressing time of the special reproduction mode switch of the operation switch of the digital data recording / reproducing apparatus, a desired cluster can be searched in a shorter time.

In the description of the embodiment of the present invention,
Although the description has been given using the device having the recording / reproducing function of digital data, it is apparent that the present invention can be applied to the special reproduction mode in the digital data reproduction-only device which only reproduces the data recorded on the nonvolatile memory card.

Further, the data of the directory entry or the FAT entry read out from the nonvolatile memory card is read out by the microprocessor, temporarily stored, and
The RAM for storing the list after the reproduction forward or bidirectional list is created has been described using an example externally connected to the microprocessor. However, the RAM built in the microprocessor may be used. Clearly there is.

[0046]

According to the present invention, the directory entry of the file data recorded on the nonvolatile memory card and the F
The AT area data is loaded, a forward list or a list is created from the data and stored in the RAM. Based on the forward or bidirectional list of the RAM, a file from the cluster of the nonvolatile memory card is read. By performing data read control, a skip destination cluster in the special reproduction mode can be searched in a short time, and furthermore, by using a bidirectional list, control of data transfer between the nonvolatile memory card and the voice processing IC is controlled. This makes it possible to use a processor with a low processing speed and low power consumption, which makes it possible to provide a lightweight, compact, and inexpensive digital data recording / reproducing apparatus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a digital data recording / reproducing apparatus according to the present invention.

FIG. 2 is an explanatory diagram explaining the principle of creating a reproduction forward direction and a bidirectional list from management data of a nonvolatile memory card in the digital data recording / reproducing apparatus of the present invention.

FIG. 3 is a flowchart illustrating an operation of creating a reproduction bidirectional list from management data of a nonvolatile memory card in the digital data recording / reproduction device of the present invention.

FIG. 4 is an explanatory diagram illustrating a state of a cluster for creating a reproduction bidirectional list according to the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional digital data recording / reproducing device.

[Explanation of symbols]

10 ... Digital data recording device, 11 ... RAM, 21 ...
Voice input circuit, 22 analog / digital conversion circuit, 2
3 ... coding / compression circuit, 24 ... microprocessor, 25
... Non-volatile memory card, 26 ... Decryption expansion circuit, 27
... Digital / analog conversion circuit, 28 ... Audio output circuit,
29: operation switches, 30: liquid crystal display means, 31: voice processing IC.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G10L 9/18 G F term (reference) 5B058 CA12 CA23 KA01 KA04 YA16 5C052 AA17 AC05 CC11 DD02 DD06 EE08 GA02 GA03 GB07 GC00 GC02 GC05 GE08 5D044 AB05 CC08 DE43 DE49 EF03 EF05 FG10 FG18 FG23 GK07 5D045 DB04 DB10 5J064 AA03 BA00 BC01 BC06 BC07 BD03

Claims (3)

[Claims] 1. A non-volatile memory card in which analog information converted to digitally encoded compressed data and progressing in a time series and management data including area information for recording the digitally encoded compressed data are recorded together. A digital data reproducing apparatus that reads out the management data and the digitally encoded compressed data, decodes and expands the read digitally encoded compressed data, and reproduces the digitally encoded compressed data as analog information that progresses in chronological order; Reproduction control means having a microprocessor means for controlling read-out of the digitally encoded compressed data and management data recorded in the memory, and recording area extraction means for reading out management data of the nonvolatile memory card and extracting recording area information Recording area information extracted by the recording area extracting means. List creation means for creating a playback order recording area list based on the information, storage means for temporarily storing the playback order recording area list created by the list creation means, and information stored in the nonvolatile memory card. Input means for setting an operation mode of the reproducing apparatus, including special reproduction for reproducing digitally encoded compressed data at a higher speed than at the time of recording, wherein the reproduction control means includes a special reproduction mode by the input means. Is set, desired digitally encoded compressed data is read out from the recording area of the nonvolatile memory card and reproduced based on the reproduction forward recording area list stored in the storage means. Digital data playback device. 2. A non-volatile memory card in which analog information converted to digitally encoded compressed data and progressing in a time series and management data including area information for recording the digitally encoded compressed data are recorded together. A digital data reproducing apparatus that reads out the management data and the digitally encoded compressed data, decodes and decompresses the read digitally encoded compressed data, and reproduces the information as analog information that progresses in time series. Reproduction control means having microprocessor means for controlling reading of the digitally encoded compressed data and management data recorded on the card; and a recording area for reading the management data of the nonvolatile memory card and extracting recording area information. Information extraction means, and a record extracted by the recording area information extraction means List creation means for creating a playback bidirectional recording area list based on area information; storage means for temporarily storing the playback bidirectional recording area list created by the list creation means; and recording on the nonvolatile memory card. Input means for setting an operation mode of the playback device, including a special playback mode for playing back the digitally encoded compressed data at a higher speed than at the time of recording, and wherein the playback control means performs special playback by the input means. When a reproduction mode is set, desired digitally encoded and compressed data is read out from the recording area of the nonvolatile memory card and reproduced based on the reproduction bidirectional recording area list stored in the storage means. Digital data reproducing device. 3. The reproduction control means measures an input time for setting the special reproduction mode when an input for setting the special reproduction mode is made by the input means, and the input time is set to a predetermined time or less. In the case of, the reproduction is skipped for each unit recording area of the recording area. 3. The digital data reproducing device according to claim 1, wherein the digital data reproducing device controls to read out the recorded digitally encoded compressed data.