JP2000183767A - Dab signal collection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital audio broadcast DAB signal collection device that efficiently collects a DAB signal required to evaluate a DAB receiver from serial data demodulated by the DAB receiver regardless of a small circuit scale. SOLUTION: The DAB signal collection device that collects required data from serial data demodulated by a DAB receiver receiving a digital audio broadcast is provided with an input processing means 1 that extracts a receiver data interface RDI signal from the serial data, an input buffer 2 that stores the extracted RDI signal, an analysis means 3 that extracts optional data from this RDI signal, an output buffer 4 that stores the extracted data, and a recording means 5 that reads the data from the output buffer 4, generates a file and records and stores the file. Since most of the data processing is conducted by the analysis means and the recording means records the processed data, the data processing load of the recording means can be relieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DAB signal collecting apparatus for collecting a DAB signal used for evaluating a digital audio broadcasting (DAB) receiving apparatus, and more particularly to a DAB signal receiving digital audio broadcasting.
RDI from serial data demodulated by receiver
(Receiver Data Interface) signal can be collected efficiently.

[0002]

2. Description of the Related Art DAB is a digital audio broadcasting standard defined in ETS 300-401. The information to be transmitted includes MSC (Main Service Channel), FIC (Fast
Information Channel) and TII (Transmitter I)
dentification Indication). MSC
Is a part where the program contents itself such as audio and data services are multiplexed on a plurality of channels, FIC is a part indicating control information such as multiplexing configuration contents of MSC, TII is a part superimposed on a synchronization signal part and is unique to a transmitting station. This part indicates information.
RDI is a standard for transmitting such information as unmodulated digital signals as serial data.
− Digital Audio Broadcasting of WGD RDI Task force
It is specified in the System / Specification of Receiver Data Interface.

According to the contents of the standard, as shown in FIG.
DI is composed of 24 bits, and one frame is composed of MSC, F
Info including main DAB data such as IC and TII
It consists of a rmation / Data field and a Frame Type field containing RDI-specific information.

[0004] Also, several transmission modes are prepared, and IEs currently used for digital audio transmission are available.
It is predominantly transmitted by being embedded in a subframe of the C958 interface standard.

[0005] The receiving side comprises a DAB receiver 12 for demodulating received data and an application decoder 13 for reproducing program contents, as shown in FIG. 8. The decoder 13 performs processing of a data service included in the MSC.

[0006]

In the development or manufacture of a DAB receiver, a signal actually being broadcast is received and a final evaluation is performed. For this purpose, in an environment where broadcasting cannot be received, such as an area where DAB broadcasting is not performed, it is necessary to simulate broadcasting by transmitting the same signal as that actually being broadcast. However, it is impossible to directly record and save broadcast waves transmitted from a broadcast station.

Therefore, there is a method in which a receiver receives and demodulates a broadcast wave, and then uses an RDI in which the broadcast content is output as a digital signal, records and saves the broadcast signal, modulates it again, and transmits it as a pseudo broadcast wave. It is valid. Note that the signal required at the minimum in the evaluation of the receiver is the FIC, and the same effect can be obtained by collecting only the FIC part and inserting table data, music source, and the like later in the MSC part.

However, the data transmission rate of RDI is about 2.
3Mbps, in which R
Redundant data added only by DI transmission is also included.
Therefore, in order to record all data as it is over a long period of time, a recording means having a high access speed and a large-capacity recording medium is required, and after recording, a necessary portion from the recorded data is used. Post-processing for extraction is required.

In addition, when recording while performing processing such as taking out only a necessary part, the data processing operation and the writing operation to the recording medium are alternated, so that access to the recording medium becomes intermittent. As a result, the time required for access increases, and a high data processing capability is required for the recording means.

[0010] Further, the RDI frame is composed of 24 bits, and is used according to IEC95 used for digital audio transmission.
It is embedded in a subframe consisting of 32 bits of the 8 interface standard and transmitted. Therefore, 3
A general-purpose digital audio interface LSI is used to extract the 24-bit RDI frame from the 2-bit data.
It takes time to capture by the analysis means. However, if you take in the analysis means in 24-bit parallel,
There is a disadvantage that the data bus width needs to be large, and the circuit scale is large.

[0011] In addition, the FIC transmitted in the actual broadcast includes information linked to the MSC such as multiplexing configuration information, as well as information on the area where broadcasting is performed and time information. In the evaluation of the receiver, it is important that the receiver correctly responds to the change in the contents of the FIC.
Therefore, when the contents of the recorded and saved FIC do not change for a long time, when retransmitting, it is necessary to partially rewrite the contents of the FIC in accordance with the evaluation contents of the receiver.

The present invention has been made to solve these problems.
An object of the present invention is to provide a DAB signal collecting device that efficiently collects a DAB signal required for evaluation of an AB receiver with a small circuit scale.

[0013]

SUMMARY OF THE INVENTION Therefore, the DAB of the present invention has been developed.
In the signal collection device, the DAB
Input processing means for extracting an RDI signal from serial data demodulated by a receiver, an input buffer for holding the extracted RDI signal, analysis means for extracting arbitrary data from the RDI signal, and An output buffer for holding the data and a recording unit for reading data from the output buffer, generating a file, and recording and storing the file are provided.

[0014] In this apparatus, since the analysis means performs most of the data processing, the data processing load on the recording means is reduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a DAB for collecting necessary data from serial data demodulated by a DAB receiver that has received a digital audio broadcast.
In the signal collection device, input processing means for extracting an RDI signal from serial data, an input buffer for holding the extracted RDI signal, analysis means for extracting any data from the RDI signal, and holding the extracted data Output buffer, and a recording unit that reads data from the output buffer, generates a file, and records and saves the file. Most of the data processing is performed by the analysis unit,
Thereafter, a file is generated by the recording means and the record is stored. Therefore, the data processing load on the recording unit can be reduced.

According to a second aspect of the present invention, there is provided an input data amount detecting means for detecting an amount of data stored in an input buffer, and when the detected data amount exceeds a predetermined amount, the analyzing means comprises: A predetermined amount of data is read from the input buffer. Even if the speed at which data is accumulated in the input buffer is different from the speed at which the analysis means reads data from the input buffer, the input buffer becomes full and overflows. And the data is not interrupted due to emptying, the amount of work that the analysis means spends for reading data from the input buffer can be minimized, and efficient data transfer to the analysis means becomes possible.

According to a third aspect of the present invention, there is provided an output data amount detecting means for detecting an amount of data stored in the output buffer, and when the detected data amount becomes equal to or less than a predetermined amount, the analyzing means is provided. A predetermined amount of data is written to the output buffer at a time. Writing to the input buffer from the analyzing means and reading of data from the input buffer from the recording means are performed based on the respective processing speeds. And asynchronously, efficient data transfer can be achieved by minimizing the amount of work that the analyzing unit spends writing data to the output buffer and the amount of work that the recording unit spends reading data from the output buffer.

According to a fourth aspect of the present invention, the recording means sets the type of data to be recorded and stored in the analysis means, and the analysis means selects data from the RDI signal based on the setting contents from the recording means. Since the analysis means selects and extracts only necessary data, the amount of data can be greatly reduced, and the DAB adapted to the data processing capacity and the recording capacity of the recording means is used. Signal collection becomes possible.

According to a fifth aspect of the present invention, the bit width of the output buffer is made larger than the bit width of the data to be transmitted, and the analyzing means indicates the type of data with respect to the data extracted from the RDI signal. The identification code is added to the data to be written to the output buffer. Even when a plurality of types of data are mixed in the output buffer, the data discriminating process on the recording unit is simplified, and the data processing of the recording unit is simplified. The load can be reduced.

According to a sixth aspect of the present invention, the input processing means extracts the RDI signal from the serial data,
Input processing control means for generating a control signal obtained by dividing one frame of I into a plurality of parts, serial / parallel conversion means for converting a serial RDI signal into parallel, and a latch for holding and outputting the converted parallel data. And stores the parallel data output from the latch in the input buffer.
Since the data can be handled as a plurality of parallel data having a predetermined bit width, expansion of the data bus width can be minimized and the data transfer to the analysis means can be speeded up.

According to a seventh aspect of the present invention, the bit width of the input buffer is set to be larger than the bit width of the parallelized RDI signal, and the input processing control means specifies one of a plurality of divided frames. A flag is added to the parallel data in the order of (1) and the data is written into the input buffer.
It is possible to easily determine which bit of the DI frame corresponds to which bit, and to simplify the data processing by the analysis means.

The invention according to claim 8 is provided with a data rewriting means for taking in a part of the DAB signal extracted by the analysis means, rewriting the content and writing it into an output buffer, and Even if there is no change for a long time, it is possible to arbitrarily make a change.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) The DA of the first embodiment
As shown in FIG. 1, the B signal collecting apparatus includes an input processing means 1 for extracting an RDI signal from serial data, an input buffer 2 for holding the extracted RDI signal, and an analysis for extracting arbitrary data from the RDI signal. Means 3, an output buffer 4 for holding the extracted data, and an output buffer 4
Recording means 5 for reading and recording data from the memory, input data amount detecting means 6 for detecting the amount of data stored in the input buffer 2, and output data amount for detecting the amount of data stored in the output buffer 7. And a detecting means 7.

The input processing means 1 uses a general-purpose digital audio interface LSI. The input buffer 2 and the output buffer 4 use memories that can be accessed simultaneously from both input and output. For 5, a general-purpose personal computer including a recording medium for storing data is used.

The signal input to this device is a DAB signal obtained by receiving and demodulating a broadcast by a DAB receiver, and as shown in FIG. 7, is a serial digital signal of the IEC958 interface standard in which an RDI signal is embedded. is there.

The input processing means 1 extracts an RDI signal composed of 24 bits per frame from the serial data of the IEC958 standard. The extracted RDI signal is
The RDI signals are sequentially stored in the input buffer 2 at a constant speed, and the RDI signals are read out to the analysis means 3 in the order of input.

The analyzing means 3 processes the RDI signal on a frame-by-frame basis, and determines the contents of the data field from the frame type field in the RDI frame shown in FIG. If the content of the data field is a valid DAB signal, the analysis means 3 packs the data to an arbitrary bit width and writes the data to the output buffer 4.

The recording means 5 reads the data from the output buffer 4 in the order of writing, generates a file, and stores it on a recording medium.

As described above, the analysis means 3 performs data processing in advance and extracts desired data, thereby reducing the data processing load on the recording means 5 and increasing the time required for accessing the recording medium. Thus, DAB data can be collected in real time.

Next, write and read control of the input buffer 2 will be described with reference to FIGS.

Writing to the input buffer 2 is performed at a constant speed in synchronization with the input RDI signal, and reading is performed asynchronously according to the processing speed of the analyzing means 3. Therefore, it is necessary to control the reading operation of the analyzing means 3 so that the data in the input buffer 2 does not become empty or full during the operation.

The input data amount detection means 6 outputs a control signal indicating whether the amount of data stored in the input buffer 2 exceeds half or less of the total capacity. At this time, 1 is output, and if the value is 1, reading is prohibited, and if the value is 0, reading is permitted.

The actual access to the input buffer 2 will be described with reference to FIG. The input RDI signal is always stored in the input buffer 2 at a constant speed over the entire period. However, at the start of the operation, the input buffer 2 is reset to clear the data in the input buffer 2 and start from an empty state. Thereafter, the analysis means 3 determines that the data amount in the input buffer 2 is 1 /
The analysis unit 3 reads data from the input buffer 2 in an amount equal to 1/2 of the total buffer capacity (period B). After the reading, the analysis means 3 performs data processing and waits again until the data amount of the input buffer 2 becomes 1/2 or more (C
Period), and thereafter, the B period and the C period are repeated.

As described above, by monitoring the amount of data stored in the input buffer 2 and controlling the read operation of the analysis means 3, data interruption or overflow can be prevented, and work relating to data read by the analysis means 3 can be prevented. The amount is reduced and efficient data transfer is enabled.

In order to detect the data amount, a counter is prepared and the count value is written up and read out, and the data amount is determined by the count value.
There is a method of using the half flag output of the memory.

Next, control of write and read operations of the output buffer 4 will be described with reference to FIGS. Since writing from the analyzing means 3 to the output buffer 4 and reading from the output means 4 by the recording means 5 are performed asynchronously at each processing speed, the analysis is performed so that each processing can be performed efficiently without waste. It is necessary to control writing from the means 3 to the output buffer 4 and reading from the output buffer 4 by the recording means 5.

The output data amount detection means 7 outputs a control signal indicating whether the amount of data stored in the output buffer 4 exceeds half or less of the total capacity. At that time, 1 is output.
And the reading of the recording means 5 is prohibited. If the value is 0, the writing of the analyzing means 3 is prohibited and the reading of the recording means 5 is permitted.

Next, the actual access to the output buffer 4 will be described with reference to FIG. First, at the start of the operation, a reset is applied, and the data in the output buffer 4 is cleared and starts from an empty state. After that, when the operation starts, as shown in FIG. 3, the analyzing means 3 first writes the processed data to such an extent that the data amount of the output buffer 4 exceeds 1/2 and is not full (for example, 3/4). To return to another process, during which the recording means 5 reduces the data amount to 1/2.
Wait for the above (period D). If it exceeds ２, the recording means 5 reads out only デ ー タ of the data from the output buffer 4, and the analyzing means 3 continues processing other than writing (period E). After that, the analyzing means 3 continues processing other than writing for a while, and the recording means 5 continues processing other than reading (period F). After the processing other than writing is completed, the analyzing means 3 confirms whether writing is prohibited or permitted. Then 1/2
Is written (period G), and the recording means 5 confirms whether reading is prohibited or permitted after processing other than reading is completed, and reads out half the data amount in the permitted state (period E). After that, the period F to the period E are repeated.

As described above, the amount of data stored in the output buffer 4 is monitored, and the writing operation to the output buffer 4 by the analyzing means 3 and the output buffer 4 of the recording means 5 are performed.
By controlling the read operation from, the amount of work involved in reading and writing is reduced, and efficient data transfer between the analyzing means 3 and the recording means 5 becomes possible.

A counter is prepared for the output data amount detecting means 7, and the count value is increased by writing and readout is decreased to determine the data amount based on the counting value. There is a way to use it.

Next, the contents of settings from the recording means 5 to the analysis means 3 will be described. The data transmission speed of RDI is about 2.3 Mbps, and even if a redundant portion is removed, the data amount becomes considerable, and a large-capacity recording medium is required to record for a long time. Thus, when the capacity of the recording medium is insufficient, the recording unit 5 gives the analyzing unit 3 setting information for selecting the type of the signal to be recorded in accordance with the contents of Table 1.

In practice, one port is assigned for setting, and the recording means 5 sets 1 to a bit assigned to a signal to be recorded and 0 to a bit assigned to a signal not to be recorded. The analysis means 3 reads this port and determines which signal is to be extracted. Then, the analyzing means 3 extracts only arbitrary DAB data according to the set contents and writes it in the output buffer 4, and the recording means 5
An arbitrary DAB signal selected from the output buffer 4 is read, a file is generated, and a recording process is performed.

[0044]

[Table 1]

As described above, by selecting the type of the DAB signal to be recorded, even when the capacity of the recording medium is insufficient, the FIC required at the minimum for evaluating the receiver is required.
Only can be recorded and stored.

Next, a plurality of types of D
When the AB signal is extracted and transmitted to the recording unit 5, the recording unit 5 must generate a file for each type while performing the recording process while determining the type of data. Therefore, the bit width of the output buffer 4 is set to be larger than the bit width of the DAB signal to be transmitted, and the analyzing means 3 writes the DAB signal extracted from the RDI into the output buffer 4,
An identification code indicating the type of the DAB signal as shown in Table 2 is written in the extended bits. The recording means 5 reads the identification code together with the DAB signal to be transmitted from the output buffer 4, generates a file for each type of the DAB signal according to the identification code, and records the file.

[0047]

[Table 2]

As described above, in the data transmission from the analyzing means 3 to the recording means 5, by adding the identification code indicating the data type, the work of discriminating the data type in the recording means 5 is simplified, and Even when the DAB signals are mixed, it is possible to collect error-free and efficient DAB signals.

(Second Embodiment) In the second embodiment,
The configuration of the input processing means will be described with reference to FIGS.

As shown in FIG. 4, the input processing means 1 includes an input processing control means 8 for extracting an RDI signal from the input serial data, and a serial / parallel conversion means 9 for converting the extracted RDI signal into parallel data. And a latch 10 for holding and outputting parallel data. The input signal is processed and then stored in the output buffer 4.

The input processing control means 8 is an input circuit in which an LSI for a general-purpose digital audio interface is combined.
A 4-bit RDI frame is extracted, and a control signal in which 24 bits are divided into a plurality of bits is generated. This input processing control means 8 outputs each signal shown in FIG.

The serial / parallel conversion means 9 converts the serial data output from the input processing control means 8 into parallel data by bit shifting with a serial clock. This data is held in the latch 10 at the rise of the latch pulse, and is written to the output buffer 4 at the rise of the write pulse.

Here, the input processing control means 8 causes the latch pulse to rise when the output of the serial / parallel conversion means 9 becomes bit b0 to bit b7 as a control signal. The write pulse rises when the bit b7 appears. b8-b
By controlling the latch pulse and the write pulse in the same manner at timings 15 and b16 to b23, the 24-bit RDI frame can be converted into parallel data divided into three in 8-bit units.

As a result, the analyzing means 3 can read the input buffer 2 in parallel data, so that the number of read cycles can be reduced, and the bit width of the input buffer 2 and the data bus width used for data transmission are set to 24 bits. Therefore, the circuit scale does not increase.

Next, the bit width of the input buffer 2 is made larger than the bit width of the RDI signal converted in parallel,
The input processing control means 8 sets the flag to 1 when the data to be written to the input buffer 2 is b0 to b7,
At 15 the flag is set to 0, and at b16 to b23, the flag is set to 0 and the flag is written to the input buffer 2.

As a result, the analysis means 3 knows the data at the head of the RDI frame among the data read from the input buffer 2, and the data read from the data corresponds to any bit of the 24-bit RDI frame. The analysis means 3 can reconstruct the RDI frame even if the data stored in the input buffer 2 is not from the beginning of the RDI frame.

(Third Embodiment) The DA of the third embodiment
The B signal collecting device rewrites and records a part of the FIC data.

As shown in FIG. 6, the apparatus includes a data rewriting means 11 for rewriting the contents of the FIC data extracted by the analysis means and writing the FIC data in the output buffer 4. Other configurations are the same as those of the first embodiment (FIG. 1) (in FIG. 6, the input processing unit and the recording unit are not shown).

In this apparatus, an arbitrary D
The AB signal is extracted and normally written to the output buffer 4 as it is. The analysis means 3 extracts the signal for the FIC, decodes the data content, and outputs the portion not requiring rewriting to the output buffer 4 and the data requiring rewriting to the data rewriting means 11.

During the output period of the data to be rewritten, the data bus connected from the analyzing means 3 to the output buffer 4 becomes high impedance, and the data bus connected from the data rewriting means to the output buffer becomes active, and the data is rewritten. Data is written to the output buffer 4.

As a result, since a part of the FIC is rewritten and recorded and saved, it is not necessary to rewrite the FIC.

[0062]

As is apparent from the above description, in the DAB signal collecting apparatus of the present invention, the data processing load on the recording means is reduced by performing the data processing in advance on the analysis means and extracting the desired data. Therefore, even if the time required to access the recording medium increases, many effective D
There is an effect that AB data can be collected.

Further, by detecting the amount of data accumulated in the input buffer and controlling the reading operation of the analyzing means, the amount of work required for reading data by the analyzing means can be reduced and the time required for other work can be increased. This has the effect that a large amount of data processing can be performed by the analysis means.

Further, by detecting the amount of data stored in the output buffer and controlling the writing operation of the analyzing means to the output buffer, the amount of work required for reading and writing can be reduced, and other operations can be performed. Since the time involved can be increased, there is an effect that a lot of data processing can be performed in the analysis means.

By providing a means for selecting the type of DAB signal to be recorded, even if the capacity of the recording medium is insufficient, it is possible to record and save only the minimum required DAB data. Have.

Further, by providing means for adding an identification code indicating the type of data in the data transfer from the analyzing means to the recording means, the operation of discriminating the data type in the recording means is simplified, and a plurality of types of DAB signals are provided. In this case, there is an effect that an error-free and efficient DAB signal can be collected even in the case where.

Further, by providing a means for converting serial data into parallel data having an arbitrary bit width, the analyzing means can read parallel data from the input buffer, so that the number of read cycles can be reduced, and the input buffer can be reduced. Since the bit width and the data bus width used for data transmission need not be 24 bits, there is an effect that the circuit scale can be reduced.

A flag is added to parallel data in a specific order in which one frame is divided into a plurality of frames, so that the parallel data read from the input buffer by the analysis means corresponds to any bit of the 24-bit RDI frame. This makes it easier to reconstruct the RDI frame by judging whether to do so, and has the effect that errors in data processing can be prevented.

Further, DAB
Since part of the data is rewritten and recorded and saved, there is an effect that it is not necessary to re-decode and rewrite the data at the time of retransmission.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an apparatus according to a first embodiment of the present invention;

FIG. 2 is an explanatory diagram of an operation of an input buffer according to the first embodiment of the present invention;

FIG. 3 is an explanatory diagram of an operation of an output buffer according to the first embodiment of the present invention;

FIG. 4 is a block diagram showing a configuration of a second embodiment of the present invention;

FIG. 5 is an explanatory diagram of an operation of an input processing unit according to a second embodiment of the present invention;

FIG. 6 is a block diagram showing a configuration of a third embodiment of the present invention;

FIG. 7 is an explanatory diagram of input serial data;

FIG. 8 is an explanatory diagram of a conventional receiver for demodulating an RDI signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input processing means 2 Input buffer 3 Analysis means 4 Output buffer 5 Recording means 6 Input data amount detection means 7 Output data amount detection means 8 Input processing control means 9 Serial / parallel conversion means 10 Latch 11 Data rewriting means 12 DAB receiver 13 Application decoder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Shoji Miyamoto, Inventor 2-5-2, Meido, Izumi-ku, Sendai, Miyagi Prefecture Inside Matsushita Communication Sendai Research Laboratories Co., Ltd. No.3-1, Matsushita Communication Industrial Co., Ltd. F-term (reference) 5K061 AA01 AA04 BB01 BB17 FF12 JJ07

Claims (8)

[Claims] 1. A DAB signal collecting apparatus for collecting necessary data from serial data demodulated by a DAB receiver that has received a digital audio broadcast, comprising: input processing means for extracting an RDI signal from the serial data; An input buffer for holding the extracted RDI signal; an analyzing means for extracting arbitrary data from the RDI signal; an output buffer for holding the extracted data; reading data from the output buffer; D which comprises
AB signal collection device. 2. An input data amount detecting means for detecting an amount of data stored in the input buffer, wherein when the detected data amount becomes equal to or more than a predetermined amount, the analyzing means comprises an input buffer. 2. The DAB signal collecting apparatus according to claim 1, wherein a predetermined amount of data is read from the DAB. 3. An output data amount detecting means for detecting an amount of data stored in the output buffer, wherein when the detected data amount becomes equal to or less than a predetermined amount, the analyzing means outputs the output data amount. 2. The DAB signal collecting apparatus according to claim 1, wherein a predetermined amount of data is written into the buffer at a time. 4. The recording means sets the type of data to be recorded and stored in the analysis means, and the analysis means selects and extracts data from the RDI signal based on the setting contents from the recording means. The DAB signal collection device according to claim 1, wherein: 5. The bit width of said output buffer is made larger than the bit width of data to be transmitted, and said analyzing means adds an identification code indicating a data type to data extracted from an RDI signal. 2. The DAB signal collection device according to claim 1, wherein the data is written to the output buffer by using a write command. 6. An input processing means for extracting an RDI signal from the serial data to generate a control signal obtained by dividing one RDI frame into a plurality of frames, and converting the serial RDI signal into parallel. 2. A serial-to-parallel conversion means for converting the parallel data, and a latch for holding and outputting the converted parallel data, wherein the parallel data output from the latch is stored in the input buffer. DAB signal collection device. 7. A bit width of the input buffer is set to be larger than a bit width of the parallelized RDI signal, and the input processing control means sets the bit width of the RDI signal in a specific order within one frame divided into a plurality of frames. For parallel data,
7. The DAB signal collecting apparatus according to claim 6, wherein a flag is added to write the data into the input buffer. 8. The DAB signal collecting apparatus according to claim 1, further comprising a data rewriting means for taking in a part of the DAB signal extracted by the analysis means, rewriting the contents, and writing the contents into the output buffer.