JPH10215196A - Label displaying method of digital radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a label to be easily seen and also not to give a user needless confusion when the label is shown on a display part of a receiver. SOLUTION: This method performs label display of a digital radio receiver which uses received label information and shows a label of a program, etc., on a display part. In such cases, the method receives label information that is expressed by a code which includes at least a space code and a character code from a broadcast station, recognizes a leading character position and shows a character string after the leading character at a specific position of each display area D1 to D8 of a display part 18a, e.g. in a left-justifying way from a left edge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying a label on a digital radio receiver, and more particularly to a digital radio receiver for automatically aligning and displaying a label of a program or the like on a display unit using received label information. Related to the label display method of the machine.

[0002]

2. Description of the Related Art Digital audio is now widely recognized for its excellent characteristics and ease of use, and is rapidly becoming popular. Against this background, digitalization of audio broadcasting has become active and digital audio broadcasting DAB (Digital Audio Broadcasting) has been realized in Europe.

FIG. 10 shows a DAB broadcast signal frame structure of mode II adopted in the DAB system. One frame length is 24 ms, and a 2-symbol synchronization section SYNC is used.
And FIC (Fast Inf)
(or Automation Channel) and a data field portion DFL of 72 symbols. The synchronization section SYNC includes a null symbol and a phase reference symbol PRS used for recognizing the start point of the frame. The high-speed information channel unit FIC has three symbols of high-speed information blocks FIB1 to FIB.
B3, including time / date data, ensemble labels (names indicating the contents of broadcast signals containing a plurality of services (programs)), service labels (names indicating individual service contents), service component labels (services) The label further includes a label (name indicating a detailed content (program name)), service arrangement data, and a program type code PTY (Program type code) indicating a program content.

The data field section DFL is divided into 72 data fields (symbols), a broadcast signal of a predetermined service (program) is inserted in each data field, and 6 to 8 services are simultaneously transmitted from one broadcasting station.
(Program) broadcast signals can be transmitted. Which service (program) corresponds to which data field is specified by service arrangement data included in the high-speed information channel unit FIC.

[0005] Each of the high-speed information blocks FIB1 to FIB3 of the high-speed information channel FIC has a hierarchical structure as shown in the figure, and inserts predetermined data into a data field 103 specified by a FIG type 101 and an extension 102. I have. That is, each high-speed information block FIB has 256
Bit (30 bytes) FIB data field
ld) and CRC, and the FIB data field contains multiple FIG.
(Fast Information Group). each
FIG (Fast Information Group) is composed of (1) FIG type (FIG type) 101, (2) Length (byte length of FIG data field), and (3) FIG data field.
In eld, Extension 102 (identification number of Type field)
And data field 103, and the data field 103
Various data such as a service label and a program type code PTY are inserted into the system. For example, as shown in FIG. 11, the service label information is FIG1 / 1 (Type 1 f
ield for extension 1), and the program type information is shown in FIG.
7 (Type 0 field forextension 17).

FIG1 / 1 (Type 1 field for extension 1)
The data field specified by is a 16-bit service identifier (Ser
vid Identifier), a character field that displays a 16-word service label (1 word / 8 bits), and a 16-bit character flag that indicates the character position used when a 16-word service label is abbreviated to 8 words It has a field.

Also, FIG0 / 17 (Type 0 field for extensio
n 17) The data field specified by S / D (Static / Dynami) indicates whether the program type code of service identifier SId (Service Identifier) is the program type code of the current program.
c) Flags, reserved areas Rfa, Rfu, number of coarse codes (NCC) NCC, number of fine codes (NFC) NFC, program type code by international code Int Code
(International code is the same program type code system as RDS.) Coarse code indicating coarse PTY code
e) Fine code indicating fine PTY code. The above shows the mode II frame configuration for satellite broadcasting using the 1.5 GHz band.However, the mode I frame configuration using the frequency band of 50 MHz to 250 MHz has almost the same configuration, and the length of one frame is 96 ms. ing.

FIG. 13 is a block diagram of a DAB transmitter.
Reference numerals a to 1m denote data compression units for highly efficiently encoding analog audio signals (audio signals of respective services) into MPEG audio data. 2a to 2m are transmission path coding units for adding an error / detection correction code, and 3 is a multiplexing unit, which outputs output data of each of the transmission path coding units 2a to 2m according to service sequence data. It is mapped to a field (symbol) and time-division multiplexed.
4 is an interleave / OFDM modulator, and IDFT
OFDM (Orthogonal Inverse)
Frequency division multiplexing is performed, and interleaving is performed by rearranging the order of multiplexed signals in a symbol according to a predetermined format. That is, OFD
The M modulator divides each symbol (phase reference symbol, data symbol) into N sets of 2 bits each, differentially encodes the first data of each set as a real part and the second data as an imaginary part, and performs differential coding of the differential code. The real part and the imaginary part are sequentially input to the inverse Fourier transform unit and subjected to IDFT processing to output a baseband modulated wave. Numeral 5 is a quadrature modulation that converts a real part and an imaginary part output from the interleave / OFDM modulator into analog signals, multiplies each by a cos wave and a sin wave of a transmission local frequency fc, and combines the multiplication results to perform orthogonal transformation. A unit 6 is a frequency conversion unit that converts a transmission carrier obtained by quadrature modulation into an RF signal, and 7 is a transmission power amplifier.

FIG. 14 is a block diagram of a DAB receiver. 1
1 is an antenna, 12 is a DAB RF signal demodulation unit,
Outputs a baseband analog signal obtained by multiplying a received signal by a cos wave and a sine wave of a carrier frequency fc, 1
Reference numeral 3 denotes an AD converter for converting a baseband analog signal into digital data at a predetermined sampling frequency;
The digital data input from the converter is subjected to an FFT demodulation process, a differential decoding process, and the like to obtain highly efficient encoded data (M
A transmission line decoding circuit for restoring / outputting PEG audio data).
Audio decoding unit for decoding into audio data, 16
Is a DA converter for converting PCM audio data to an analog audio signal; 17 is a control microcomputer for controlling the entire DAB receiver; 18 is an operation / display unit;
Reference numeral 8a denotes a display unit, and 18b denotes an operation key unit.

The transmission line decoding circuit 14 includes an FFT differential demodulation unit 14a, a selective decoding unit 14b, a deinterleave unit 1
4c and the like. The FFT differential demodulation unit 14a performs FFT processing and differential decoding processing on the digital data output from the AD converter 13, and demodulates the interleaved transmission data. The deinterleave 14c deinterleaves the output data of the FFT differential demodulation unit to return to the original data sequence, and the selective decoding unit 14b performs error detection and correction processing on the deinterleaved data, and the contents of the high-speed information channel unit FIC. Is input to the control microcomputer 17.

The control microcomputer 17 detects the symbol position (data field) of the service (program) designated by the user based on the service arrangement data included in the high-speed information channel unit FIC, and notifies the selective decoding unit 14b.
The selective decoding unit 14b outputs decoded data (MPEG audio data) of the notified symbol (data field) to the audio decoding unit 15. The audio decoding unit 15 converts the input decoded data (MPEG audio data) into the original PCM audio data and outputs it. The control microcomputer 17 appropriately changes a service label or the like included in the high-speed information channel FIC according to a user request.
It is displayed on the display section 18a of the operation / display section 18.

[0012]

An ensemble label, a service label, and a service component label are inserted into a high-speed information channel FIC of a DAB broadcast signal and transmitted. A DAB receiver is included in the received DAB broadcast signal. These labels can be extracted and displayed on the display unit 18a as appropriate. Each label can be described in a maximum of 16 words, but abbreviated notation of up to 8 characters can also be performed using the abbreviated notation character position information sent together with the label.

In DAB broadcasting, the maximum number of display characters is specified, but notation content (display method) is not specified. For this reason, spaces and characters constituting labels are sequentially displayed in the order of reception from the first digit display position. FIG. 15A shows that the character code of the service label is space, space, space, A, P, N, space,
FIG. 15B is an example of a display when the character code of the service label arrives at A, P, N, space, space, space, space, space. However, in such a display method, FIG.
As is clear from 5, the label display position is not consistent,
The display position of the first character of the label changes depending on the position of the space and the number thereof, causing confusion to the user and causing a problem that the label is difficult to read.

Further, in the DAB broadcast system, since a plurality of programs (services) are included in the DAB broadcast signal, labels of all services included in the DAB broadcast signal during reception may be displayed at the same time. In such a case, the spaces and characters constituting each label are sequentially displayed on each line of the display unit from the first digit display position in the order of reception. However, in such a display method, there is a problem that the display position of the first character of the label varies in each line depending on the space position and the number of each label as shown in FIG. In particular, in the case of in-vehicle DAB receivers, the size of the display unit is limited, so abbreviated notation of up to 8 characters is often performed. With the conventional label display method described above, services (programs) are increasingly being confirmed. There is a problem that becomes difficult.

[0015] From the above, it is an object of the present invention to display a label on a display unit of a receiver by displaying characters in accordance with a predetermined rule regarding a label display position, so that the label is easy to see and useless confusion to the user. Is to not give. Another object of the present invention is to reduce the label to a character string composed of a small number of characters and display the label on the display unit in a legible manner even when the number of characters to be displayed on the display unit is limited.

[0016]

According to the present invention, there is provided a means for receiving, from a broadcasting station, label information represented by a code including at least a space code and a character code;
This is achieved by means for recognizing the first character position of the label and means for sequentially displaying a character string subsequent to the first character from a specific display position on the display unit (for example, the left end position of the display unit). By these means, regardless of the position of the space included in the label and the number of spaces, the label leading character can always be aligned with the left end position of the display unit and displayed. Therefore, the label can be displayed in an easy-to-read manner without giving the user unnecessary confusion.

Further, according to the present invention, the present invention provides a means for converting an N-digit label character string into an n-digit character string (n <N) by using the abbreviation character position information sent together with the label information. And means for recognizing the leading character position of the obtained n-digit character string and displaying the character string after the leading character from the specific display position of the display unit. According to this means, even when the number of characters displayed on the display unit is limited,
The label can be shortened to, for example, eight characters and displayed on the display unit for easy viewing.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(A) Configuration of DAB Receiver FIG. 1 is a configuration diagram of a DAB receiver of the present invention. 11 is an antenna, 12 is a DAB RF signal demodulator for receiving a desired DAB broadcast signal wave, multiplying the received signal by a cos wave and a sine wave of a carrier frequency fc and outputting a baseband analog signal, 13 is a baseband An AD converter for converting an analog signal into digital data at a predetermined sampling frequency;
Is a transmission line decoding circuit for restoring / outputting high-efficiency code data (MPEG audio data) by performing FFT demodulation processing, differential decoding processing, etc., and 15 is audio decoding for decoding MPEG audio data to original PCM audio data. Unit, 16 is a DA converter for converting PCM audio data into an analog audio signal, 17 is a control unit for controlling the entire receiver, 18 is a display unit 18a, an operation unit 18b
The operation / display unit includes: LB is 8 on the display 18a.
It is a display example in the case of displaying a plurality of service labels in abbreviated character notation.

The DAB RF signal demodulator 12 includes a tuner 12a and a quadrature demodulator 12b. The tuner section 12a receives a DAB signal radio wave and converts it into an intermediate frequency signal. The front end 12a-1 has a tuning section, a high frequency amplifier, and a frequency converter, and a PLL circuit that outputs a frequency signal according to a tuning frequency. (Local oscillation circuit) It is composed of 12a-2. The quadrature demodulation unit 12b multiplies the received signal by a cos wave and a sine wave of the carrier frequency fc and outputs a baseband analog signal. The transmission line decoding circuit 14
It includes a differential demodulation unit 14a, a selective decoding unit 14b, a deinterleave unit 14c, and the like. The control unit 17 has a microcomputer configuration, and includes a CPU 17a, a program memory (ROM) 17b for storing various programs, a data memory (RAM) 17c for storing data, and the like, and a DAB RF signal demodulation unit 12 and a transmission line decoding. Circuit 14 and an operation / display unit 18.

The FFT differential demodulation unit 14a of the transmission line decoding circuit 14 performs FFT processing and differential decoding processing on the digital data output from the AD converter 13 to demodulate the interleaved transmission data. Deinterleave 14
c deinterleaves the output data of the FFT differential demodulation unit to return to the original data sequence, and the selective decoding unit 14b performs error detection and correction processing on the deinterleaved data and controls the contents of the high-speed information channel unit FIC. Input to the unit 17. The control unit 17 obtains the symbol position (data field) of the service based on the service arrangement data included in the high-speed information channel unit FIC and the service (program) specified by the user, and notifies the selective decoding unit 14b. The selective decoding unit 14b outputs decoded data (MPEG audio data) of the notified symbol (data field) to the audio decoding unit 15. The audio decoding unit 15 converts the input MPEG audio data into the original PCM audio data and outputs it.
Further, the control unit 17 appropriately assigns a service label or the like included in the high-speed information channel FIC to the operation unit 1 in response to a user request.
8 for display.

(B) First Label Display Method FIG. 2 is an explanatory diagram of a display method according to the present invention in a case where labels relating to a program being received are displayed left-aligned for 16 characters, and the ith code is represented by C [ (i-1)]. The head of the label for 16 characters is not a space and ABCDEFGHIJKLM
In the case of NOP, as shown in FIG.
Labels are displayed sequentially from the left end position of “a” (the first digit display position). On the other hand, if the first m characters of the label for 16 characters are spaces, the first character that is not a space (the (m + 1) th character) is recognized, and m spaces are added to the end of the label character string after the first character. The obtained character string is displayed on the display unit 18.
The images are sequentially displayed from the left end position (the first digit display position) of a. FIG. 2B shows a case where three spaces exist at the head of the label, and the left end position (first digit display position) of the display unit 18a.
, The character strings from the first character A onward are sequentially displayed. In addition, three spaces are added at the end and displayed. FIG. 3 is a display processing flow of the control unit 17 when the label is displayed left-aligned for 16 characters.

When the DAB is being received, the control unit 17 extracts the first code C [0] of the service label included in the received DAB signal, and determines whether the first code C [0] is a space code or a character code. Check for code (step 2
01, 202). If not a space code, Figure 2
As shown in (a), labels are displayed sequentially using the received code from the left end position (first digit display position) of the display unit 18a (step 203). On the other hand, if the first code C [0] is a space in step 202, A = 1 is set (A
Is the number of consecutive spaces at the beginning of the label), then (A
It is checked whether the (+1) th code C [A] is a space code (steps 204 and 205). If it is a space code, A is advanced by A + 1 → A (step 20).
6) The process of step 205 is executed.

Thereafter, the processing of steps 205 and 206 is repeated until the (A + 1) -th code C [A] is no longer a space code. In step 205, if the (A + 1) -th code C [A] is not a space code, character strings C [0] to C [0] to C
The character [15] is shifted to the left by A characters to delete the first A spaces (step 207). Then, the letter C [15]
, A space of A characters is inserted to create a new character string of 16 characters (step 208). Since then,
The character strings for six characters are sequentially displayed as new labels from the left end position (first digit display position) of the display unit 18a (step 203).

The above description is for a case where 16 characters are displayed left-aligned, but a label of 16 characters may be displayed in a shorthand notation for 8 characters. FIG. 4 is an explanatory diagram of a display method according to the present invention in a case where a label relating to a program being received is shortened to eight characters and then displayed left-aligned. If the head of the abbreviation label for 8 characters is not a space but ABCDEFGH,
As shown in FIG. 4A, the left end position (first
The label is displayed sequentially from the digit display position). On the other hand, if the first m labels of the abbreviation label for 8 characters are spaces,
Recognize the first character (m + 1-th character) that is not a space in the label, add m spaces to the end of the label character string after the first character, and display the obtained character string on the display unit 1.
8a are sequentially displayed from the left end position (first digit display position).
FIG. 4B shows a case where three spaces exist at the head of the label, and the character strings starting with the first character A are displayed sequentially from the left end position (first digit display position) of the display unit 18a.
In addition, three spaces are added at the end and displayed.

FIG. 5 is a diagram for explaining a method of changing a 16-character label to an 8-character short notation label. 111 is a 16-character label, and 112 is a 16-bit short notation sent together with the label from a broadcasting station. The number of bits of “1” in the character position information (character flag information) is eight. 113 is 8
Label abbreviated to letters. The 1st to 16th bits of the character flag information 112 are the 1st to 1st bits of the label 111.
By selectively outputting the character corresponding to the 16th character and corresponding to the bit of "1", the label of the 16th character can be changed to an abbreviated label of 8 characters. In FIG.
Since the fourth bit, the thirteenth bit to the sixteenth bit are “1”, eight characters “ABCDMN” corresponding to these bits are set.
“OP” is output as the shorthand label 113.

FIG. 6 is a processing flow of the control unit 17 for changing a 16-character label to an 8-character shorthand label.
[Y] means the (Y + 1) -th character code of the 16-character label, and B [X] means the (X + 1) -th character code of the 8-character shorthand label. First, B [X] (X = 0 to 7) is cleared (step 201), and then, I = 0 and J = 0 are initialized (step 202). Thereafter, it is checked whether I ≧ 16 (step 203). If I <16, it is checked whether the (I + 1) th character flag is “1” (step 204). If "1", 16
The (I + 1) -th character code of the character label is the (J + 1) -th character code of the shortened display label. That is, B [J]
= C [I] (step 205). Thereafter, J and I are incremented respectively (step 206), and the process of step 203 is performed. If the (I + 1) -th character flag is not "1" in step 204, only I is incremented (step 207), and the process of step 203 is performed. Since then
If the above processing is repeated until I ≧ 16, the label of 16 characters is changed to the shortened label of 8 characters.

(C) Second Label Display Method FIG. 7 is a processing flow when eight abbreviation labels are displayed left-aligned on a display unit having a display area for 16 characters per line and 4 lines. As shown in FIG. 8, the display area of the display section 18a is divided into two areas in which each line is composed of eight characters, and display area numbers 1 to 8 are assigned to the respective display areas D1 to D8. By the processing in FIG. 7, the shorthand label is displayed left-justified in each of the display areas D1 to D8 as shown in FIG. 9A. In FIG. 9A, ALPHA 1 RDS3 RDS2 ALPHA 4 RDS1 RDS4 ALPHA 2 ALPHA 3 is a shorthand label.

In the processing flow of FIG. 7, first, N = 0
(Step 301). Next, it is checked whether there is an unfocused program in the DAB signal being received (step 30).
2) If it exists, the program name (service label) is stored in the program name buffer S [N] (step 303). Thereafter, N is incremented by N + 1 → N (step 304), and it is checked in step 302 whether an unfocused program exists, and the subsequent processing is performed. As described above, the service labels of all services included in the currently received DAB signal are stored in the program name buffer S [N]. When the service labels of all services are stored in the program name buffer S [N], I is initialized to 0 (step 305), and the program name (service label) stored in the program name buffer S [I] is changed to 8 The label is changed to a character abbreviation label (step 306). Next, it is checked whether the first code C [0] of the shorthand notation label is a space code (step 307).
Shorthand labels are sequentially displayed from the left end position of the display area DI _{+ 1} indicated by the display area number (I + 1) (step 30).
8). On the other hand, in step 307, the first code C
If [0] is a space code, the left alignment display processing of FIG. 3 is executed (step 309), and the obtained new labels are sequentially displayed from the left end position of the display area DI _{+ 1} (step 308). .

Thereafter, I is incremented (step 310), and it is checked whether I> N (step 311).
If so, the processing after step 306 is repeated, and the next program name is displayed left-aligned. By the above, DAB during reception
If the display of the abbreviated notation labels of all the programs included in the broadcast signal ends, I> N in step 311 and the label display processing ends. As a result, as shown in FIG. 9A, the shorthand label is displayed left-justified in each of the display areas D1 to D8. Note that when the label is converted to a shorthand label and displayed as it is without performing the left alignment processing of the present invention, the result is as shown in FIG. 9B, and the label is compared with the present invention of FIG. 9A. It is difficult to read and recognize.

Although the label display method in DAB broadcasting has been described above, the present invention is not limited to DAB broadcasting but can be applied to label display in RDS broadcasting. As described above, the present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the present invention described in the claims, and the present invention does not exclude these.

[0031]

As described above, according to the present invention, label information represented by a code including at least a space code and a character code is received from a broadcasting station, the position of the first character of the label is recognized, and the character string after the first character is recognized. Is displayed from the specific display position of the display unit, so that the label is easy to see and
Labels can be displayed to avoid unnecessary confusion to the user. Further, according to the present invention, the N-digit label character string is converted into an n-digit character string (n <N) by using the abbreviation character position information sent together with the label information, and the obtained n-digit character Since the first character position of the column is recognized and the character string after the first character is displayed from the specific display position of the display unit,
Even if the number of characters displayed on the display is limited,
The label can be displayed by shortening the label of B to eight characters, and furthermore, it can be displayed easily and without giving unnecessary confusion to the user.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a DAB receiver of the present invention.

FIG. 2 is an explanatory diagram of a case where a label for a program being received is displayed left-aligned for 16 characters.

FIG. 3 is a processing flow in a case where labels relating to a program being received are displayed left-aligned for 16 characters.

FIG. 4 is an explanatory diagram of a case where labels relating to a program being received are displayed left-aligned for eight characters.

FIG. 5 is an explanatory diagram for changing a 16-character program name (service label) in DAB to an 8-character abbreviation.

FIG. 6 is a flowchart for changing a 16-character program name (service label) in DAB to an 8-character abbreviation.

FIG. 7 is a flowchart (when left-aligned) of displaying eight program titles using a display unit of 16 characters and 4 lines.

FIG. 8 is an explanatory diagram of a display area number when a display unit of 16 characters and 4 lines is used for displaying eight abbreviation label labels.

FIG. 9 is a diagram illustrating a comparison between the present invention and a conventional method when a plurality of 8-character service labels (abbreviated notation labels) are displayed.

FIG. 10 is an explanatory diagram of a frame structure in DAB broadcasting.

FIG. 11 is an explanatory diagram of service label information.

FIG. 12 is an explanatory diagram of program type information.

FIG. 13 is a configuration diagram of a DAB transmitter.

FIG. 14 is a configuration diagram of a DAB receiver.

FIG. 15 is an explanatory diagram of a conventional label display example.

[Explanation of symbols]

 11 Antenna 12 RF signal demodulation unit for DAB 14 Transmission line decoding circuit 15 Audio decoding unit 17 Control unit 18a Display unit 18b Operation unit

Claims (2)

[Claims] 1. A label display method for a digital radio receiver for displaying a label of a program or the like on a display unit using received label information, the label information being represented by a code including at least a space code and a character code. Receiving the label, recognizing the first character position of the label, and displaying the character string after the first character in order from a specific position on the display unit. 2. An N-digit label character string is converted into an n-digit character string (n <N) using the abbreviation character position information sent together with the label information. 2. The label display method for a digital radio receiver according to claim 1, wherein a character position is recognized and a character string after the first character is displayed in order from a specific position on the display unit.