KR20080036414A - Apparatus and method for section filtering - Google Patents

Abstract

An apparatus and a method for section filtering are provided to set an interest field in each of section fields and increase an address in a section field unit automatically when the interest fields of a corresponding section filter are accessed all, thereby accessing the section filter in a field unit even in an automatic address increment mode. A plurality of section filters(41) compares input section data with a section filter value with a desired field value to filter the input section data. A photofield mask unit(42) sets at least one interest field in correspondence to each section field and directs whether the set interest fields are accessed all of the set interest fields. An access port unit(43) enables the section fields to access in a field unit, displays a field access state on the photofield mask unit, and increases access addresses for the section fields automatically in a section field unit according to the direction of the photofield mask unit.

Description

Apparatus and Method for Section Filtering

1 is an overview of a section processing procedure in a digital broadcasting receiver;

2 is an overview of a section filter;

3 is an example of a section filter operating in an address auto increment mode;

Figure 4 is an embodiment of a section filtering apparatus according to the present invention,

5 is a specific example of the operation of a section filter;

6 illustrates an embodiment of a port field mask unit;

7 illustrates an embodiment of setting an access bit,

8 shows another embodiment of setting an access bit,

9 is an overview for explaining the port field mask unit;

10 is an overview of a section filtering apparatus in which an address is automatically increased in units of section filters by applying a photo field mask;

11 is an embodiment of a section filtering method according to the present invention.

* Explanation of symbols for main parts of the drawings

41: section filter 42: port field mask portion

43: access port 61: access bit storage

62: indicator

The present invention relates to a section filtering apparatus. In particular, it is possible to set a field of interest in each section filter and to automatically increase an address in section filter units when all of the fields of interest of the corresponding section filter are accessed. In section Automatic Address Increment Mode, you can also access section filters on a field-by-field basis.

In the digital broadcasting service, the MPEG-2 system standard (ISO / IEC 13818-1) for transmitting compressed video data or audio data includes program specific information (PSI) as program information about video data, audio data, and additional data. It is specified to transmit together. PSI refers to detailed program information for distinguishing a specific program from a transport stream (TS) to which data of various programs are time multiplexed and input.

Such program information is periodically transmitted with the same content, so that the user can obtain accurate program information at any time, unlike video data or audio data. Therefore, in order to avoid redundant decoding of program data, system decoders of various digital broadcast receivers capable of receiving digital broadcasts such as digital TVs install filters and extract only desired data. .

Meanwhile, program information is transmitted in the form of section data defined in the MPEG-2 system standard, and the section data is composed of several fields, and a section filter (Section) is used to extract desired section data among the section data. Filter) is used.

Referring to FIG. 1, a system decoder of various digital broadcasting receivers, such as a digital TV, separates A / V data and section data contained in an input transport stream (TS). By filtering through the section filter (S11), it is determined whether the desired section data (S12). If it is desired section data, it is processed and used as necessary (S13). If it is not desired data, it is discarded (S14).

Referring to FIG. 2, various digital broadcasting receivers are provided with a plurality of section filters, and each section filter compares the input section data with a section filter value set by the user and determines whether the section data is desired section data.

To this end, section filter values for section filtering should be written in each section filter, and there are several fields in which section filter values should be written. Although FIG. 2 illustrates an example of fields F1 to F14, the structure and type of the field may be changed. In addition, each field may include a field included in a section header such as F1 to F9, a mask field, and the like. At this time, if the digital broadcast receiver has n section filters, it is necessary to write a section filter value for all n section filters.

To describe a specific example of a field included in the section filter with reference to FIG. 3, a 'TBL_ID' field, a 'SSI' field, a 'PI' field, a 'TSI' field, a 'VER_NUM' field, and a ' 'CNI' field, 'SEC_NUM' field, 'LAST_NUM' field, 'PROTO_VER' field, etc., mask data field (MASK1 ~ MASK4) which specifies whether each field value is used for filtering, location information of reference register Field 'GPB_IDX' field is shown.

On the other hand, as the number of section data required for Conditional Access System (CAS) or Electronic Program Guide (EPG) has increased recently, the number of section filters continues to increase. The number of fields included in the filter is also increasing. This raises the need for effective access to increased section filters.

One way to do this is to use a single address port and data port to access multiple registers, like memory, and to increase the address port access time. Automatic Address Increment) method is used in parallel.

However, in the conventional automatic address increasing mode, the data size of the port is limited to the word size (32 bits). In the example of FIG. 3, in order to write a section filter value to a section filter having a 7 word size of 14 fields, the section filter value is not written for each of the 14 fields, but is accessed seven times in a word size unit of several fields. It should be.

When the section filter value in word units (32 bits) is written to the section filter, the address is automatically increased to the next word. That is, the unit of automatic address increment is 32 bits, which is a port size, which makes it difficult for software programmers to access only the word unit instead of the field unit when writing the section filter value to the section filter.

Accordingly, the present invention has been made to solve the above problems, it is possible to set the field of interest in each section filter and to automatically increase the address in the section filter unit when all the fields of interest of the corresponding section filter is accessed. Another object of the present invention is to provide a section filtering apparatus and method for allowing a section filter to be accessed on a field basis even in an automatic address increment mode.

In order to achieve the above object, the section filtering apparatus according to the present invention comprises: a plurality of section filters for filtering the input section data by comparing with a section filter value having a field value desired to pick out; A port field mask unit configured to set at least one interest field corresponding to each section filter and indicate whether all of the set interest fields are accessed; And allowing the section filter to be accessed in units of fields, displaying an access state for each field in the port field mask unit, and automatically increasing an access address for the section filter in units of section filters according to the instruction of the port field mask unit. It includes an access port portion.

The port field mask unit may include: an access bit storage unit indicating whether a corresponding field is accessed as a logical value corresponding to each field included in the section filter; And an indication unit indicating a current state of the access bit storage unit.

The initial state of the access bit storage unit may be set to a value representing a state in which a logical value of a bit corresponding to the interest field is not accessed, and a logical value corresponding to other fields to a value representing a state already accessed. Can be configured.

The logical value representing the non-accessed state may be configured as '0' (or '1'), and the logical value representing the accessed state may be configured as '1' (or '0'). In this case, the indicator may be configured to perform an AND operation on all bits of the access bit storage unit.

On the other hand, the section filtering method according to the present invention comprises the steps of setting one or more fields of interest for each of the plurality of section filters; Allowing a section filter value to be written in field units to a section filter currently being processed and indicating whether or not the set interest field is accessed; And automatically increasing the access address for the section filter in section filter units when all fields of interest of the corresponding section filter are accessed as a result of the display.

The setting of the interest field may be configured by setting each bit indicating whether access to the corresponding field is required corresponding to each field included in the section filter.

The initial state of each bit indicating whether the access is required is to set a bit corresponding to each of the fields of interest to a logical value representing an unaccessed state and other bits to a logical value representing a state already accessed. It can be configured to set.

The logical value representing the non-accessed state may be configured as '0' (or '1'), and the logical value representing the accessed state may be configured as '1' (or '0'). At this time, whether all the fields of interest of the section filter have been accessed may be configured to be determined according to the result of the logical AND operation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 4, the section filtering apparatus according to the present invention includes a plurality of section filters 41 for filtering section data, a port filter mask part 42 for setting a field of interest for each section filter, and a section filter. It includes an access port 43 for accessing the.

In general, a digital broadcast receiver includes a plurality of section filters # 1 to #n. Each section filter includes a plurality of fields that write section filter values. The section filter filters the input section data by comparing the section filter values with the field values.

That is, the section filter 41 compares the section data inputted with the section filter values written with the desired values in each field to determine whether the section data match. The method of performing the section filtering can be configured in various ways as necessary. have.

Referring to FIG. 5, an example of filtering section data in which fields 1 and 3 of a section header have a specific value, first, writes desired values in fields 1 and 3 of the section field values of the corresponding section filter. Any other field value is irrelevant. When the section filter value 52 in which the desired values are written in the fields 1 and 3 is exclusively ORed with the input section data 51 (53), the field 1 of the section data 51 and the section filter value 52 is calculated. If and and field 3 coincide with each other, the output bits corresponding to field 1 and field 3 are both '0'. At this time, the other bits may be any value. Subsequently, if the mask data 55 in which all the bits of the field 1 and the field 3 are set to '1' and the remaining bits are set to '0' is ANDed with the exclusive ORed data 54 (56), the entire output The bit value will be '0'. This process allows you to filter the desired section data.

In the following, each section filter includes the same field, and each section filter includes 'TBL_ID', 'SSI', 'PI', 'TSI', 'VER_NUM', and 'CNI' as shown in FIG. , Section header fields such as 'SEC_NUM', 'LAST_NUM', and 'PROTO_VER', mask data fields (MASK1 to MASK4) that specify whether each field data is used for filtering, and 'GPB_IDX', the geolocation field of the reference register. An example including a field will be described. Unmarked parts mean parts that are not used for section filtering, such as reserved fields.

Meanwhile, the port field mask part 42 sets one or more interest fields among the fields included in the section filter 41 corresponding to each section filter, and displays whether each set interest field is accessed. Do this. For example, the port field mask part # 1 42-1 sets which field of interest of the section filter # 1 is, and also indicates whether each field of interest of the section filter # 1 has been accessed.

Referring to FIG. 6, an embodiment of configuring the port field mask unit # 1 42-1 corresponds to each field included in the corresponding section filter # 1. The access bit storage section 61 indicating whether or not the corresponding field has been accessed as a logic value of '0' or '1', and the logical value of the accessed state of all the bits of the access bit storage section 61 are set. It may be made of an indicator 62 for determining whether or not.

At this time, the access bit storage unit 61 is configured to have as many bits as the maximum number of fields the section filter can have, and each bit corresponds to each field to indicate whether or not the corresponding field is accessed. Can be. The initial state of the access bit storage 61 may be set by dividing the interest field and the non-interest field.

That is, the logical value corresponding to the field of interest is set to a value ('0' or '1') indicating an inaccessible state, and the logical value corresponding to an uninterested field is set to a value ('1' or If set to '0'), a masking effect on the field of interest may be indicated. Assume that only 'TBL_ID', 'SSI', 'PI', 'TSI', 'VER_NUM', 'CNI' and 'SEC_NUM' fields are of interest for a section filter as shown in the example shown in FIG. A specific embodiment of the bit storage unit 61 will be described.

Referring to FIG. 7A, the initial state of the access bit storage unit 61 sets a logical value of a bit corresponding to the field of interest to a logical value '0' indicating an unaccessed state, and corresponds to other fields. The logical value of the bit is set to '1', which indicates the accessed state because the field is not of interest.

In this embodiment, the indicator 62 may be configured to perform an AND operation on all the bits of the access bit storage 61, as in the example shown in FIG. 7B.

That is, when each field is accessed through the access port 43, the corresponding bit of the corresponding access bit storage unit 61 is changed to a logical value '1'. Since all bits will be changed to a logic value '1', the output value of the indicator 62 becomes a logic value '1' indicating completion of access.

Another embodiment of setting an initial state of the access bit storage unit 61 with reference to FIG. 8A will be described. A logical value of a bit corresponding to the field of interest is set to a logical value '1' indicating an unaccessed state. The logical value of the bit corresponding to the other field is set to a logical value '0' indicating the accessed state because the field is not of interest.

In this embodiment, the indicating unit 62 is configured to perform an OR operation on all bits of the access bit storage unit 61 as in the example shown in FIG. 8B.

That is, when each field is accessed through the access port 43, the corresponding bit of the corresponding access bit storage 61 is changed to a logical value '0'. Since all bits will be changed to a logic value '0', the output value of the indicator 62 becomes a logic value '0' indicating completion of access.

In this way, it is possible to know whether all of the fields of interest are accessed as output values of the indicator 62.

On the other hand, the access port 43 is a component that manages the address port and the data port so that the section filter value can be written to the section filter 41, and in particular, it is possible to write the section filter value in units of fields to each section filter. When a certain field is accessed, the port field mask unit 42 corresponding to the corresponding section filter is displayed. In addition, the access address for the section filter is automatically increased in section filter units according to the state of the port field mask section 42.

Referring to FIG. 10, when the port field mask unit 42 is set as in the example of FIG. 9, Write (TBL_ID), Write (SSI), Write (PI), Write (TSI), Write (VER_NUM), Write After the CNI and Write (SEC_NUM) field-level write accesses, the port address pointer in the automatic address increment mode is in the state indicating the next section filter. In this way, the access port 43 automatically increases the address in the section filter unit, which indicates that the section filter currently being processed can be accessed in the field unit. That is, the programmer can increase the port address by considering that only seven fields out of the fourteen fields constituting the section filter exist in the section filter.

An embodiment of a section filtering method according to the present invention will now be described with reference to FIG. 11.

First, one or more fields of interest are set for each of the plurality of section filters (S111).

An embodiment of setting a field of interest includes bits corresponding to each field included in each section filter and indicating whether access to the corresponding field is required, and setting a logical value of the bits. will be. In this case, the number of bits may be configured as the maximum number of fields that a section filter can have. Each of these bits also indicates that the field was accessed when it was accessed.

The initial state of each of these bits is configured to set the bit corresponding to the field of interest to a logical value representing the non-accessed state, and to set the other bits to a logical value representing the accessed state, thereby masking the field of interest. It can be effective.

One example of setting the initial state of each bit is to set the logical value of the bit corresponding to the field of interest to a logical value '0' (or '1') indicating an unaccessed state, corresponding to the other fields. The logical value of the bit is set to a logical value '1' (or '0') indicating the accessed state because the field is not of interest.

Now, it is possible to write the section filter value in field units to the section filter currently being processed, and to indicate whether or not the interest field set in step S111 is accessed (S112).

In the above-described embodiment, when a field is accessed, the bit corresponding to the field may be changed to a logical value in the accessed state to indicate whether or not the access is made. That is, if the initial value of the bit corresponding to the field of interest is '0' (or '1'), it is changed to '1' (or '0') after the corresponding field is accessed.

When all the fields of interest of the corresponding section filter have been accessed (S113), the access address for the section filter is automatically increased in section filter units (S114). Otherwise, the process returns to step S112. Keep the section filter accessible.

At this time, in step S113, as described above, the initial value of the bit corresponding to the field of interest is the logical value '0' (or '1') and is changed to the logical value '1' ('0') after the corresponding field is accessed. According to an embodiment of the present invention, when all of the logic values of each bit become '1' (or '0'), it may be determined that all the interest fields of the corresponding section filter are accessed. That is, when the result of the AND operation on each bit is a logical value '1' (or '0'), it may be determined that all fields of interest of the corresponding section filter are accessed.

According to the present invention, when section filtering is used in various digital broadcasting receivers, the section filter can be accessed in units of desired fields even in an automatic address increment mode.

Claims (14)

A plurality of section filters for filtering the input section data by comparing the filtered section data with a section filter value having a field value desired to be selected; A port field mask unit configured to set at least one interest field corresponding to each section filter and indicate whether all of the set interest fields are accessed; And An access for allowing the section filter to be accessed in units of fields, displaying an access state for each field in the port field mask unit, and automatically increasing the access address for the section filter in units of section filters according to the instruction of the port field mask unit; Section filtering device comprising a port portion. The method of claim 1, The port field mask unit may include: an access bit storage unit indicating whether a corresponding field is accessed as a logical value corresponding to each field included in the section filter; And an indication unit indicating a current state of the access bit storage unit. The method of claim 2, The initial state of the access bit storage unit is configured to set a logical value of a bit corresponding to the field of interest to a value representing a non-accessed state, and a logical value corresponding to other fields to a value representing an accessed state. Section filtering device, characterized in that. The method of claim 3, wherein And the logical value representing the non-accessed state is '0' and the logical value representing the accessed state is '1'. The method of claim 4, wherein And the indicating unit is configured to perform an AND operation on all bits of the access bit storage unit. The method of claim 3, wherein And the logical value representing the non-accessed state is '1' and the logical value representing the accessed state is '0'. The method of claim 6, And the indicating unit is configured to perform an OR operation on all bits of the access bit storage unit. Setting one or more fields of interest for each of the plurality of section filters; Allowing a section filter value to be written in field units to a section filter currently being processed and indicating whether or not the set interest field is accessed; And And automatically increasing an access address for the section filter in section filter units when all fields of interest of the section filter are accessed as a result of the display. The method of claim 8, The setting of the interest field is configured by setting each bit indicating whether access to the corresponding field is required corresponding to each field included in the section filter. The method of claim 9, The initial state of each bit indicating whether the access is required is to set a bit corresponding to each of the fields of interest to a logical value representing an unaccessed state and other bits to a logical value representing an accessed state. And the section filtering method is configured to. The method of claim 10, And the logical value representing the non-accessed state is '0' and the logical value representing the accessed state is '1'. The method of claim 11, And determining whether all fields of interest of the section filter have been accessed according to a result of the logical AND operation of the respective bits. The method of claim 10, And the logical value representing the non-accessed state is '1' and the logical value representing the accessed state is '0'. The method of claim 13, And determining whether all fields of interest of the section filter have been accessed according to a result of performing an OR operation on each bit.

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