JP3694393B2 - Multiple broadcast receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multiplex broadcast receiver that selects one of a plurality of programs multiplexed on carrier waves of different frequencies.
[0002]
[Prior art]
Today, digital audio is generally recognized for its excellent characteristics and ease of use, and is rapidly becoming popular. Against this background, the movement of digitalization of audio broadcasting has become active, and digital audio broadcasting DAB (Digital Audio Broadcasting) has been put into practical use in Europe.
[0003]
Such a DAB receiver (DAB receiver) has a considerably complicated structure as compared with a normal VHF / FM receiver, but has many advantages that make up for it. For example, even in a moving car, sound quality equivalent to CD can be ensured, many broadcast programs can be received, programs can be broadcast in multiple languages, weather and traffic information can be received continuously, and audio and video advertisements can be received There are advantages such as.
[0004]
As the current DAB broadcast channels, empty frequencies between the reception frequencies assigned to the respective television broadcast channels are used, and a total of 64 channels are prepared. A carrier frequency group corresponding to each broadcast channel is called an ensemble, and 6 to 8 broadcast programs (services) are multiplexed in each ensemble.
[0005]
Such switching of the received program in the DAB receiver is performed according to the operation of a predetermined operation key by the user. For example, each time an “Up” key or “Down” key is pressed by the user, various programs (services) multiplexed in each ensemble are selected in order. Further, the DAB receiver has a function of displaying the name given to the service in parallel with the receiving operation of such various services, and character data indicating the name of the service being received is displayed on the provided display unit. Can be displayed.
[0006]
[Problems to be solved by the invention]
By the way, as described above, the DAB receiver displays the character data indicating the contents of the service being received, and the user recognizes the contents of the service being received by viewing this display, and the desired service is displayed. It can be determined whether or not. However, when operating an in-vehicle DAB receiver or when operating a DAB receiver located at a remote location by a remote control (remote control) unit, the operation is often performed without looking at the display. The contents may not be confirmed. In such a case, in order to determine whether or not the service is a desired service, it is necessary to listen to the received service for a while to determine its contents, and a plurality of services until the desired service can be received. Considering the case of switching, it took a lot of time and effort to select the service, and the operability was bad.
[0007]
The present invention was created in view of the above points, and an object of the present invention is to provide a multiplex broadcast receiver that can easily grasp the contents of a received program and improve operability. .
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, the multiplex broadcast receiver of the present invention extracts program content data representing the content of a program received by the program receiving means from the received signal by the program content data extracting means, and the content audio output means. Audio indicating the program content is output based on the program content data, it is easy to grasp the content when selecting and switching the received program, and there is no unnecessary effort in selecting the received program The operability can be improved. In particular, since the contents of the received program can be grasped without looking at the display unit, it is effective when it is not easy to check the contents of the display as in the case of an in-vehicle multiplex broadcast receiver.
[0009]
In addition, an operation means for instructing reception of a program is further provided, and when a reception instruction for the program is given by the operation means, a user performs an operation for selecting a program by outputting a sound of the program content. Since it is possible to grasp the contents of the switching destination program each time, it becomes easy to select a program while grasping the contents, and the operability can be improved.
[0010]
In addition, when performing audio output of the program content described above, the information necessary for the user can be obtained even when a plurality of programs using various languages are mixed by using the same language as the language of each program. Can be communicated. In particular, if audio output is performed using a language that the user cannot understand, the program itself using this language will be excluded from the selection. It is preferable to notify the user in the language used in this program.
[0011]
Further, when the multiplex broadcast receiver described above is for digital audio broadcasting, the label data included in the high-speed information channel of the received signal frame can be used as the program content data, and text-to-speech synthesis based on this label data By performing the processing, an audio signal indicating the contents of the received program can be easily generated.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The DAB receiver according to the embodiment to which the multiplex broadcast receiver of the present invention is applied uses the label data for display included in the control information (high-speed information channel) of the DAB signal to generate audio indicating the contents of the received program. It is characterized by output. Each program of DAB corresponds to the above-mentioned program. Hereinafter, a DAB receiver according to an embodiment will be described with reference to the drawings.
[0013]
FIG. 1 is a diagram showing a configuration of a DAB receiver according to an embodiment to which the present invention is applied. The DAB receiver 1 shown in FIG. 1 includes an antenna 2, a front end unit (F / E) 4, a DAB decoding unit 6, an audio decoding unit 8, a digital-analog converter (D / A converter) 10, an amplifier 12, The speaker 14, the control unit 16, the text voice synthesis unit 18, the operation unit 40, the display unit 42, and the switch unit 44 are configured. The text-to-speech synthesizer 18 includes a dictionary ROM 20, a language processing unit 22, a phoneme ROM 24, a speech synthesizer 26, a speech storage unit 28, and a D / A converter 30.
[0014]
The front end unit 4 extracts a desired reception frequency (tuning frequency) component from the signal received via the antenna 2 and outputs an intermediate frequency signal obtained by performing frequency conversion on the extracted signal. The DAB decoding unit 6 performs orthogonal demodulation processing, FFT (Fast Fourier Transform) demodulation processing, and decoding processing on the intermediate frequency signal output from the front end unit 4, and demodulates the interleaved transmission data. After this interleaving is performed and the original data string is restored, error detection and correction processing is performed, and a high-speed information channel FIC including a service list of each ensemble indicating the symbol position of the multiplexed broadcast program, etc. Data frame consisting of (data).
[0015]
The audio decoding unit 8 performs decompression processing for restoring the decoded data (MPEG audio data) output from the DAB decoding unit 6 and outputs decompressed PCM audio data. The D / A converter 10 converts the PCM audio data output from the audio decoding unit 8 into an analog signal and outputs the analog signal. The analog audio signal is input to the amplifier 12 through the switch unit 44 and amplified, and is output from the speaker 14.
[0016]
The control unit 16 controls the entire DAB receiver 1 by performing frequency tuning control by the front end unit 4 and a service switching instruction to the DAB decoding unit 6. Further, the control unit 16 extracts the label data and language code of each service included in the high-speed information channel FIC of the DAB signal, and the various types of extracted data are input to the text-to-speech synthesis unit 18.
[0017]
The dictionary ROM 20 stores a dictionary corresponding to various languages such as English and Japanese, and switches the dictionary to be used based on the language code output from the control unit 16. The language processing unit 22 receives the label data (text data) output from the control unit 16, analyzes the label data based on the dictionary data stored in the dictionary ROM 20, and converts the continuous label data into meaning. Break it down into a word.
[0018]
The phoneme ROM 24 stores phoneme data corresponding to various languages, and switches phoneme data to be used based on the language code output from the control unit 16. The speech synthesizer 26 receives the label data for each word decomposed by the language processing unit 22, and based on the phoneme piece data stored in the phoneme piece ROM 24, the phoneme piece data for each pronunciation unit is input to the voice storage unit 28. In addition to storing, voice synthesis is performed by superimposing the sequentially stored voice data. The synthesized voice data is converted into an analog voice signal by passing through the D / A converter 30.
[0019]
The operation unit 40 includes various operation keys for inputting various operation instructions such as a service switching instruction from the user, and sends the operation state of the operation key by the user to the control unit 16. The display unit 42 displays the name assigned to the currently received service, and displays the operation status of the operation unit 40 by the user. Further, the switch unit 44 selectively outputs the audio signals input from the two D / A converters 10 and 30 toward the amplifier 12 in accordance with an instruction from the control unit 16.
[0020]
The above-described front end 4, DAB decoding unit 6, audio decoding unit 8 and control unit 16 are program receiving means, the control unit 16 is program content data extracting means, the text voice synthesizing unit 18 is content voice output means, and the operation unit 40 corresponds to the operation means.
[0021]
FIG. 2 is a diagram illustrating a mode II frame structure employed in the DAB receiver 1. One frame length is 24 ms, and is composed of a 2-symbol synchronization signal SYNC, a 3-symbol high-speed information channel FIC, and a 72-symbol data field DFL. The synchronization signal SYNC includes a null symbol and a phase reference symbol PRS used for recognizing the start point of the frame.
[0022]
The high-speed information channel FIC is composed of three high-speed information blocks FIB. The data field DFL is divided into 72 data fields, and broadcast signals of predetermined services and announcements are inserted into the respective data fields so that 6 to 8 services can be received simultaneously from one broadcast wave. It has become. Which service corresponds to which data field is specified by service list data included in the high-speed information channel FIC.
[0023]
The high-speed information block FIB is composed of a plurality of high-speed information groups FIG. Each high-speed information group FIG includes a FIG header and a FIG data field. The FIG header includes a “FIG type” indicating the type of data included in the FIG data field and a “length” indicating the byte length of the FIG data field. Also, the first byte of the FIG data field has different contents for each FIG type, and an extension is included in a part thereof.
[0024]
For example, in the case of a type 0 field, the first 1 byte of the FIG data field includes a C / N (Current / Next) flag, an OE (Other Ensemble) flag, a P / D flag, and an extension in order from the top. ing. The contents of detailed data included in the FIG data field are defined by the FIG type and the extension. Hereinafter, for example, a data field corresponding to the extension 17 of the FIG type 0 field is represented as FIG (0/17).
[0025]
The area excluding the first byte of the FIG data field includes various types of data specified by the FIG type and the extension, and various reception controls can be performed by reading out this data. For example, FIG (0/17) includes a program type PTy corresponding to each multiplexed service. Also, FIG (0/2) and FIG (0/3) use the service list in each ensemble, FIG (0/3) uses the service identification SId, and FIG (0/5) uses it. The language codes FIG (1/0) and FIG (1/1) include ensemble labels and service labels, which are text data corresponding to each ensemble name and service name displayed on the display unit 42 during program reception. ing.
[0026]
The DAB receiver 1 of this embodiment has such a configuration, and the operation thereof will be described next. FIG. 3 is a flowchart showing the operation procedure of the program switching operation by the DAB receiver 1 of this embodiment, and mainly shows the operation procedure by the control unit 16 and the text-to-speech synthesis unit 18. It is assumed that any channel is currently received and the program is switched in a predetermined order when the “up” key or “down” key of the operation unit 40 is subsequently pressed. Moreover, program switching shall follow the order of the service identification SId contained in FIG (0/3).
[0027]
The control unit 16 constantly monitors whether or not the “up” key or the “down” key provided in the operation unit 40 has been pressed, and has any key been pressed to instruct switching of the service? It is determined whether or not (step 101). When any key is pressed, the control unit 16 switches the service to be received according to the pressed key (step 102). Specifically, the control unit 16 extracts a service list, which is a service list multiplexed in the ensemble being received, based on FIG (0/2) and FIG (0/3). The service identification SId of each service included in the service list is read, and the service identification SId corresponding to each service is compared with the service identification SId corresponding to the currently received service.
[0028]
For example, when the “up” key of the operation unit 40 is pressed, the control unit 16 determines whether there is another service corresponding to the service identification SId having a larger value than the service identification SId of the currently received service. Find out. As a result, when there is a corresponding service, the control unit 16 separates, from the multiplexed data, the service having the next largest service identification SId after the currently received service to the DAB decoding unit 6. Send instructions. The DAB decoding unit 6 responds to an instruction sent from the control unit 16, and from the multiplexed data included in the data field DFL, service audio data (MPEG audio data) corresponding to the specified service identification SId. To extract. The extracted audio data is converted into PCM audio data by the audio decoding unit 8, converted into an analog audio signal through the D / A converter 10, and then input to one input terminal of the switch unit 44. The
[0029]
On the other hand, when there is no other service to be switched within the same ensemble, the control unit 16 instructs the front end unit 4 to switch the reception frequency, and the frequency of the carrier wave received by the front end unit 4 After switching, the DAB decoding unit 6 is instructed to separate the service having the smallest service identification SId from among a plurality of services included in the ensemble corresponding to the switched carrier wave. The DAB decoding unit 6 responds to an instruction sent from the control unit 16, and from the multiplexed data included in the data field DFL, service audio data (MPEG audio data) corresponding to the specified service identification SId. To extract. The extracted audio data is converted into PCM audio data by the audio decoding unit 8, converted into an analog audio signal through the D / A converter 10, and then input to one input terminal of the switch unit 44. The
[0030]
After the service switching operation described above or in parallel with the switching operation, the control unit 16 analyzes FIG (1/1) and FIG (0/5) (step 103), and from FIG (1/1). Label data as display text data indicating the contents of each service is acquired, and a language code used in each service is acquired from FIG (0/5). The label data and language code acquired in this way are output to the text-to-speech synthesizer 18 (step 104).
[0031]
Next, the text-to-speech synthesizer 18 creates speech data indicating the content of the switched service based on the label data and language code output from the controller 16 (step 105). First, the language code is input to the dictionary ROM 20 and the phoneme piece ROM 24, and the respective dictionary or phoneme piece data is switched to the contents corresponding to the language code. Next, the language processing unit 22 uses the dictionary ROM 20 that has been switched to the contents corresponding to the language code in this way, analyzes the input label data, and breaks it down into meaningful words. The speech synthesizer 26 uses the phoneme ROM 24 switched to the content corresponding to the language code, and extracts phoneme data (speech data) in units of one pronunciation for each word decomposed by the language processor 22, Speech synthesis is performed by superimposing the extracted phoneme data for each word. The synthesized voice data is converted into an analog voice signal by passing through the D / A converter 30 and then input to the other input terminal of the switch unit 44.
[0032]
Next, the control unit 16 sends an input voice switching instruction to the switch unit 44, and the switch unit 44 to which the switching instruction is input outputs the input voice from the D / A converter 30 of the text voice synthesis unit 18. An audio signal corresponding to the name assigned to the service after the reception switching is output (step 106). The audio signal output from the switch unit 44 is amplified by passing through the amplifier 12 and output from the speaker 14. The voice output of the service name performed in this way is continued for a predetermined time or until no voice signal is created.
[0033]
After that, the control unit 16 sends an input voice switching instruction to the switch unit 44 again, and the switch unit 44 to which the switching instruction is input outputs the audio signal input from the audio decoding unit 8 side (step). 107). The audio signal corresponding to each service output from the switch unit 44 is amplified by passing through the amplifier 12 and output from the speaker 14.
[0034]
As described above, the DAB receiver 1 of the present embodiment displays the label data for display corresponding to the switching destination service when the operation key provided in the operation unit 40 is pressed and the switching operation of the reception service is performed. Based on this, an audio signal is created and output. Therefore, the user of the DAB receiver 1 can grasp the contents of the switched service (for example, whether it is news or sports) by this output voice. In particular, when operating the in-vehicle DAB receiver 1 or when switching the service using the remote control unit, there are many cases where the operation is performed without looking at various information displayed on the display unit 42. Audio output makes it easy to grasp the general contents of each service without actually listening to the contents of the service, enabling efficient service switching operations and improving operability. .
[0035]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the summary of this invention. For example, in the above-described embodiment, the service name is output as a voice by analyzing FIG (1/1) and acquiring label data. However, FIG (1/0) is analyzed and each ensemble is analyzed. The label data may be acquired and the ensemble name may be output as a voice. Alternatively, FIG. (1/16) may be analyzed to obtain label data of components (services further classified) that constitute each service, and the service component name may be output as voice.
[0036]
Further, these names may be combined and output as audio. For example, when a user performs a service switching operation, the ensemble name corresponding to the service to be switched to is first output by voice, then the service name is output by voice, and then the service voice is output. Good.
[0037]
In the above-described embodiment, each time a service switching instruction is issued, the service label is acquired one by one and the service name is output by voice. Subsequently, the service voice is output. However, the service switching instruction is issued. In such a case, only the service name may be output sequentially without outputting the service sound. Alternatively, the services included in all ensembles that can be received by performing frequency sweeping may be received in order, and each service name and service, or only each service name may be voice-output one after another.
[0038]
【The invention's effect】
As described above, according to the present invention, the program content data representing the content of the received program is extracted from the received signal, and the sound indicating the program content is output based on the extracted program content data. It is easy to grasp the contents when selecting and switching, and it is possible to improve operability without taking unnecessary trouble when selecting a received program. In addition, when the user receives an instruction to receive a program by operating means, the contents of the program to be switched to are grasped whenever the user performs an operation for selecting a program. Therefore, it is easy to select a program while grasping the contents, and the operability can be improved. Furthermore, when performing the audio output of the program content described above, the information necessary for the user can be obtained even when a plurality of programs using various languages are mixed by using the same language as the language of each program. Can be communicated.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a DAB receiver according to an embodiment to which the present invention is applied.
FIG. 2 is a diagram illustrating a frame structure used in a DAB receiver.
FIG. 3 is a flowchart showing an operation procedure of a program switching operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 DAB receiver 4 Front end part 6 DAB decoding part 8 Audio decoding part 10, 30 Digital-analog (D / A) converter 16 Control part 18 Text voice synthesis part 20 Dictionary ROM
22 Language processor 24 Phoneme ROM
26 voice synthesis unit 28 voice storage unit 44 switch unit

Claims (1)

Program receiving means for extracting program data contained in the received signal and receiving a predetermined program;
Program content data extracting means for extracting program content data representing the content of the program received by the program receiving means from the received signal;
A dictionary that can correspond to the language code extracted by the program content data extracting means;
Dictionary switching means for switching the dictionary to be used based on the language code extracted by the program content data extracting means;
Content audio output means for performing audio output using the language of the corresponding program based on the program content data extracted by the program content data extraction means using the dictionary switched by the dictionary switching means;
A multiplex broadcast receiver characterized by comprising

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