JP2006332971A - Digital radio receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound adding unit and a sound adding method which are capable of automatically selecting an optimal sound effect corresponding to a received content. <P>SOLUTION: A CPU 16 receives digital information through a receiver 11. The digital information contains information as to broadcasting stations, categories, etc. The CPU 16 selects a sound effect corresponding to information as to the broadcasting stations and the categories, referring to an optimal sound effect table stored in a RAM 18. When category information that is not stored in the optimal sound effect table is received or the category information can not be received, audio data are received through the receiver 11, and the genre of a musical piece is specified based on the audio data. A sound effect is selected based on the specified genre information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital radio receiver capable of adding an optimal sound effect to input content.

  In recent years, tuner-equipped AV devices that can listen to multi-channel broadcasting such as satellite digital radio broadcasting have become widespread. Digital radio broadcasting distributes high-quality music such as music CDs, and various audio effects are applied to tuner-equipped AV equipment that can listen to them, in order to better listen to high-quality music. It is common to have a function to do this.

  In the digital radio broadcast and the like, abundant contents (music pieces and the like) are distributed, and a user who listens to the contents manually selects an optimal sound effect for each content. The sound effect has been selected by the user with reference to the broadcast station ID added to each distribution content by each broadcast station and unique category information (genre information). For example, when the category information indicates JAZZ, the acoustic effect of JAZZ has been selected.

In order for the user to refer to the category information as described above, the tuner-equipped AV device extracts the broadcast station ID added by each broadcast station for each distribution content and unique category information and displays various information on the display unit. It has a function. In order to display such information immediately after radio reception, a radio broadcast receiver that stores additional information distributed from each broadcast station in combination with program identification information in an internal memory has been proposed (for example, Patent Document 1). reference).
JP 2001-308732 A

  The radio broadcast receiver described in Patent Document 1 stores additional information distributed from each broadcast station in the internal memory in pairs with program identification information, and stores the additional information stored in the internal memory when the program is received next time. By displaying the information on the display unit, the user can quickly refer to the category information and the like.

  However, even if the user can quickly refer to the category information and the like, the troublesomeness of manually selecting the optimal sound effect has not been eliminated by the radio broadcast receiver of Patent Document 1.

  Moreover, the category information is uniquely set by each broadcasting station, and there is a possibility that the category information differs depending on the broadcasting station even for the same music piece. Furthermore, there is a possibility that category information is not added to the distribution content. In this case, there is a problem that the user cannot determine which acoustic effect should be selected.

  An object of the present invention is to provide a digital radio receiver capable of automatically selecting an optimal sound effect according to received content.

  The digital radio receiver according to the present invention includes a receiving means for selecting and receiving any broadcast signal from digital radio broadcasts transmitted by a plurality of broadcast stations, and a plurality of acoustic effects on the content included in the received broadcast signal. For each broadcast station, an acoustic effect imparting means for giving and outputting any acoustic effect, additional information acquisition means for acquiring broadcast station information and category information of the content from additional information included in the received broadcast signal, A table storage means for storing a sound effect table in which category information and sound effects are associated with each other, and broadcast station information and category information acquired by the additional information acquisition means, with reference to the sound effect table, the reception Selecting means for selecting a sound effect to be applied to the content included in the broadcast signal and instructing the sound effect providing means. And butterflies.

  In the present invention, the additional information is cut out from the received broadcast signal (for example, music of digital radio broadcast). The additional information generally includes broadcast station information and category information (genre information). In the present invention, a table in which genre information and sound effects are associated with each broadcasting station is defined in advance. Based on the broadcast station information and category information included in the received broadcast signal, the sound effect described in the table is selected, and the sound effect is added to the music of the broadcast signal and output. For example, a table for associating the acoustic effect of a song whose genre information is Pops with a POP is defined, and when a song whose genre information is Pops is received, the acoustic effect of the POP is added.

  In the present invention, it is further preferable that the selection means includes the acoustic effect table when the additional information acquisition means cannot acquire broadcast station information and category information, or the broadcast station information and category information acquired by the additional information acquisition means. If the corresponding sound effect does not exist, the optimum sound effect is determined based on the content of the content included in the received broadcast signal, the determined sound effect is selected, and the sound effect providing means is selected. It is characterized by instructing.

  In this invention, the genre of the received digital radio broadcast music is specified to determine the optimum acoustic effect. The genre is specified from the tempo, volume, chord progression, etc. of the music. For example, if the tempo is fast, the volume of a bass range such as a bass drum is large, and the chord progression is simple, the genre is specified as DISCO. When a piece of music that does not include genre information in the additional information or a piece of music that does not have genre information included in the additional information in the table is received, the genre of the music is specified.

  According to the present invention, the selection means further searches the sound effect table with the broadcast station information and category information acquired by the additional information acquisition means, and if the corresponding sound effect does not exist, the determined sound The effect is added to the sound effect table in association with broadcast station information and category information.

  In the present invention, when a tune having no genre information included in the additional information is received in the table and the sound effect is determined by specifying the genre, the determined sound effect is added to the table in association with the genre information. . Thereafter, when the same music is received, the sound effect is selected with reference to the table.

  According to this invention, a table in which category information (genre information) and sound effects are associated in advance is defined for each broadcast station, additional information is cut out from the received broadcast signal, and broadcast station information and categories included in the table are included. Since the sound effect is added to the received digital radio broadcast music or the like based on the information and output, the optimal sound effect can be automatically selected according to the received digital radio broadcast music.

  Also, since the genre of the received digital radio broadcast music is specified and the optimal sound effect is selected, the sound effect is automatically selected even when a music that does not include genre information is received in the additional information. be able to.

  FIG. 1 is a block diagram of the digital radio broadcast receiving apparatus of this embodiment. The digital radio receiver receives a digital radio broadcast and demodulates the tuner 10, inputs a signal demodulated by the tuner 10 and separates and outputs a digital audio signal (audio data) and digital information (additional information). The receiver 11, the DSP 12 that processes the digital audio signal input from the receiver 11, the D / A converter 13 that converts the digital audio signal processed by the DSP 12 into an analog audio signal, the amplifier 14 that amplifies the analog audio signal, and the amplifier A speaker 15 for generating sound from the analog audio signal amplified at 14, a CPU 16 connected to the receiver 11 and the DSP 12, a ROM 17 connected to the CPU 16, a RAM 18 connected to the CPU 16, a user I / F 19 connected to the CPU 16, and Connected to the CPU 16 for various information And a Shimesuru display unit 20.

  The tuner 10 selects only a signal of a desired channel selected by the user through the user I / F 19 from the digital broadcast frequency band, and demodulates the signal into a baseband signal. The demodulated signal is input to the receiver 11. The demodulated signal is separated into the linear digital audio signal and digital information by the receiver 11. The separated digital information will be described in detail later.

  The separated digital audio signal is input to the DSP 12. The DSP 12 performs signal processing for adding an acoustic effect to the input digital audio signal. Specifically, an effect such as a delay is added and equalizing is performed. Various processing parameters of the DSP 12 are set by the CPU 16.

  The digital audio signal that has been subjected to signal processing by the DSP 12 and added with an acoustic effect is converted into an analog audio signal by the D / A converter 13, amplified by the amplifier 14, input to the speaker 15, and emitted.

  The CPU 16 sets various processing parameters of the DSP 12. The ROM 17 stores various parameter setting values for adding various sound effects by the DSP 12, and the CPU 16 reads the setting values stored in the ROM 17 and sets them in the DSP 12.

  Various parameter setting values stored in the ROM 17 are stored with names according to their respective acoustic effects. As shown in FIG. 2, a sound field environment suitable for various music genres such as ROCK and POP is shown. A plurality of items to be reproduced are stored. For example, ROCK is a sound effect with a strong atmosphere that suppresses the midrange and emphasizes the high and low ranges, and POP is an acoustic effect with a light atmosphere that emphasizes the midrange. MUSIC HALL is an acoustic effect that lengthens the reverberant sound and gives the sound a sense of spread, and is suitable for classical music and the like.

  The above acoustic effect can be selected by the user operating the user I / F 19. The user operates the user I / F 19 to select a channel to be received, and selects an acoustic effect according to his / her preference. The CPU 16 reads the sound effect selected by the user I / F 19 from the ROM 17 and sets it in the DSP 12.

  The above sound effect selection is a case where the user manually selects, but the digital radio broadcast receiving device in the present embodiment can also automatically select the sound effect according to the received digital radio broadcast. Hereinafter, the case of automatic selection will be described.

  The CPU 16 receives digital information from the receiver 11. The digital information cut out by the receiver 11 is additional information included in each content in digital radio broadcasting. This additional information is added to the distribution content by each broadcasting station, and includes information such as images and texts. When the distribution content is a song, the additional information generally includes broadcast station information, song information (music name, artist name, etc.), category information (genre information), and the like. In the digital radio broadcast receiving apparatus, this additional information can be displayed on the display unit 20, and thus the user can obtain various information.

  Based on the digital information received from the receiver 11, the CPU 16 selects one of a plurality of acoustic effects stored in the ROM 17, reads the set value, and sets it in the DSP 12. As described above, the digital information received from the receiver 11 includes broadcast station information and genre information of the content. In this digital radio broadcast receiving apparatus, an optimum sound effect table in which broadcast station information and genre information are associated with sound effects is defined in advance and stored in the RAM 18. The CPU 16 refers to the optimum sound effect table in the RAM 18 using the broadcast station information and genre information received from the receiver 11 and selects the corresponding sound effect. Various parameter setting values of the selected acoustic effect are read from the ROM 17 and set in the DSP 12.

  FIG. 2 is a diagram showing an optimal sound effect table. As shown in the figure, in the sound effect table, a plurality of categories (genres) for each broadcasting station are described, and corresponding sound effects are described in each category. In the acoustic effect column, one of the acoustic effects stored in the ROM 17 is described. In order to define such a table, category information to be added to the content from each broadcast station is aggregated in advance, and an optimal acoustic effect is selected for each category. As described above, the sound effect suitable for each music genre, such as the ROCK sound effect is associated with the ROCK category, is described.

  Of the digital information received from the receiver 11, the CPU 16 first refers to the optimum sound effect table based on the broadcast station information and searches for the corresponding broadcast station. Thereafter, among the digital information received from the receiver 11, the optimum acoustic effect table is referred to based on the category information, and the corresponding category information is searched. Thereafter, the sound effect corresponding to the corresponding category information is selected, and the setting value stored in the ROM 17 is read out and set in the DSP 12.

  Category information is uniquely added to each content by each broadcast station, and even with the same music, different category information may be added depending on the broadcast station, but received in this embodiment Since the category is referred to for each broadcasting station based on the broadcasting station information, a plurality of sound effects are not selected for one piece of music.

  The CPU 16 may select and read out the acoustic effect having the same name as the received genre information without referring to the table. For example, when the genre information indicates ROCK, the ROCK sound effect may be selected immediately.

  Next, a case where a music piece that does not have the corresponding category information even when the optimum acoustic effect table is searched is received, or a case that a music piece that does not contain category information is received will be described. The music for which there is no corresponding category information is the case where the broadcasting station uniquely distributes and distributes the music, the latest music that is distributed as a new category, the music that cannot be categorized, or the like.

  First, in the same manner as described above, the CPU 16 refers to the optimum acoustic effect table based on the broadcast station information among the digital information received from the receiver 11, and searches for the corresponding broadcast station. Thereafter, among the digital information received from the receiver 11, the optimum acoustic effect table is referred to based on the category information, and the corresponding category information is searched. If the category information is not included in the digital information, or if the corresponding category information is not found even after searching the optimum sound effect table, the receiver 11 is transmitted with information identifying the genre of the received music. Instruct.

  The receiver 11 can perform FFT (Fast Fourier Transform) in real time on the digital audio signal (audio data) of the received music, and when receiving an instruction from the CPU 16 to transmit information specifying the genre of the music, A plurality of music parameters based on the audio signal are transmitted to the CPU 16 as information for specifying the genre of the music.

  The music parameters transmitted by the receiver 11 are a tempo parameter, a volume parameter for each frequency band, a chord progression parameter, and the like.

  The tempo parameter is obtained by measuring the number of appearances of a sound having a characteristic peak on the frequency axis within a predetermined time. For example, based on the number of bass drums. The number of occurrences of bass drum peaks (low-frequency range peaks) is measured within a predetermined time, and this number is used as a tempo parameter. As the number of bass drum peaks in a given time increases, the song is considered to have a faster tempo. Of course, you may make it detect peaks other than a bass drum. For example, the number of hi-hat sound peaks (peaks in the high sound range) may be measured. Alternatively, the bass drum or hi-hat spectrum may be stored in advance in a memory or the like (not shown), and the stored spectrum and the received music spectrum may be compared to extract the bass drum or hi-hat.

  The volume parameter for each frequency band is obtained by dividing the audio data subjected to FFT into a plurality of bands (low sound, medium low sound, medium high sound, high sound, etc.) and using the power of each band as a reference. The power of each band is measured, and this is used as a volume parameter for each frequency band. Alternatively, the volume of the highest peak in each band may be used as the volume parameter for that band.

  The chord progression parameter is an estimate of the chord progression of the music. The chord sound of the music at that time is estimated from the frequency showing the highest peak in the main band (midrange) of the music. Further, the chord sound may be estimated from a plurality of peaks. By performing chord sound estimation in real time, the chord progression of the music can be estimated, and this is used as a chord progression parameter.

  The CPU 16 receives these music parameters from the receiver 11 and specifies the genre of the music. That is, the sound effect most suitable for the received music parameter is selected from the sound effects stored in the ROM 17. For example, if the tempo is fast (the number of bass drums is large), the power of the low range is high (the volume of the bass drum is large), and the chord progression is simple (the number of chords is small), Since the music can be determined to be a disco music, the DISSCO sound effect is selected from the sound effects stored in the ROM 17.

  In this way, among the received songs, those for which category information is not added, and those for which no corresponding category exists even if the optimum sound effect table is searched are stored in the ROM 17 using the song parameters. A sound effect can be automatically selected by associating it with one of the existing sound effects.

  Note that the CPU 16 may perform the processing for converting the audio data into the song parameters. In this case, the CPU 16 receives audio data from the receiver 11.

  The genre of music (optimum acoustic effect) specified by the above processing is added to or overwritten in the optimum acoustic effect table stored in the RAM 18 in the music that does not have the corresponding category even after searching the optimum acoustic effect table. Can be updated. The CPU 16 associates the selected sound effect with the category information included in the digital information received from the receiver 11 and adds the information to the optimum sound effect table. Thereby, when the music is received thereafter, the CPU 16 can select the sound effect by searching the optimum sound effect table.

  The ROM 17 may be a rewritable ROM such as an EEPROM, and the updated optimal acoustic effect table may be stored by transferring the contents of the RAM 18 (optimal acoustic effect table) to the ROM 17.

  Next, the operation of the digital radio broadcast receiving device will be described in detail. FIG. 3 is a flowchart showing the operation of the digital radio broadcast receiving apparatus. This operation is performed when the user selects a reception channel.

  First, a channel designated by the user I / F 19 is received (s10). As described above, the tuner 10 selects and demodulates only the signal of the designated channel. The demodulated signal is input to the receiver 11.

  Thereafter, the audio data and the digital information are separated by the receiver 11, and the CPU 16 acquires the digital information from the receiver 11 (s11). The CPU 16 determines whether broadcast station information and category information are included in the acquired digital information (s12). If broadcast information and category information are included in the acquired digital information, the optimum sound effect table is searched using this (s13). As described above, first, a broadcast station corresponding to the broadcast station information is selected using the broadcast station information. Thereafter, it is determined whether or not there is a category corresponding to the category information (s14). If the corresponding category exists, the corresponding acoustic effect is selected and read from the ROM 17 (s15). Thereafter, the read sound effect is set in the DSP 12 (s15 → s22).

  When it is determined that category information is not included in the digital information received in the process of s12, or when it is determined that category information is included but there is no category information corresponding to the optimum acoustic effect table in the process of s14 The genre specifying process is performed (s16). As described above, the receiver 11 (or the CPU 16) analyzes the received audio data by FFT or the like, and measures a plurality of music parameters. The CPU 16 selects a sound effect most suitable for this music from these music parameters from among those stored in the ROM 17 (s17).

  Thereafter, the display unit 20 is used to display the automatically selected sound effect to the user and prompt confirmation (s18). The user uses the user I / F 19 to instruct and determine whether this sound effect is acceptable. When the user instructs to determine that the sound effect is acceptable, or when no operation is performed after a predetermined time has elapsed, it is determined whether the acquired digital information includes broadcast station information and category information. (S20). If category information is not included, that is, if it is determined that category information is not included in the digital information received in the process of s12, the read sound effect is set in the DSP 12 (s20 → s22).

  If category information is included, that is, if it is determined in step s14 that there is no category information corresponding to the optimum sound effect table, the read sound effect is associated with the category information and added to the optimum sound effect table. Then, the contents of the RAM 18 are overwritten (s21). Thereafter, the read sound effect is set in the DSP 12 (s21 → s22).

  When it is not determined that the sound effect automatically selected by the user is sufficient in the process of s18, that is, when the user inputs that he / she wants to change by operating the user I / F 19, a sound effect candidate or the like is displayed on the display unit 20. Then, as in the past, the user manually selects the sound effect using the user I / F 19 (s18 → s19). Thereafter, the selected sound effect is set in the DSP 12 (s19 → s22).

  As described above, the digital radio broadcast receiving apparatus according to the present embodiment can automatically select the optimal acoustic effect according to the received content.

  Note that the user may be able to select whether or not to perform the above-described automatic sound effect selection at the user I / F 19. Instead of performing automatic sound effect selection, a mode for manual selection as in the prior art may be selected.

  In the present embodiment, the digital radio broadcast receiving device has been described. However, the configuration of the present invention is not limited to this. For example, it may be an FM radio broadcast receiving device capable of receiving data multiplex broadcasting, or a CD playback device having a function of downloading category information from a CDDB (CD Data Base).

Block diagram of digital radio broadcast receiver The figure which showed the optimal sound effect table Flow chart showing operation of digital radio broadcast receiving device

Explanation of symbols

10-tuner 11-receiver 12-DSP
13-D / A converter 14-amplifier 15-speaker 16-CPU
17-ROM
18-RAM
19-User I / F
20-display part

Claims (3)

Receiving means for selecting and receiving any broadcast signal from digital radio broadcasts transmitted by a plurality of broadcast stations;
Sound effect imparting means for imparting and outputting any of the plurality of sound effects to the content included in the received broadcast signal;
Additional information acquisition means for acquiring broadcast station information and category information of the content from the additional information included in the received broadcast signal;
Table storage means for storing a sound effect table in which category information and sound effects are described in association with each broadcast station;
By referring to the sound effect table with the broadcast station information and category information acquired by the additional information acquisition unit, the sound effect to be applied to the content included in the received broadcast signal is selected and instructed to the sound effect applying unit Selection means to
Digital radio receiver equipped with. The selection means corresponds to the case where the additional information acquisition means cannot acquire the broadcast station information and category information, or searches the sound effect table with the broadcast station information and category information acquired by the additional information acquisition means. If there was no sound effect to
The digital radio receiver according to claim 1, wherein an optimal sound effect is determined based on the content of the content included in the received broadcast signal, and the determined sound effect is selected and instructed to the sound effect providing means. The selection means searches the sound effect table with the broadcast station information and category information acquired by the additional information acquisition means, and when there is no corresponding sound effect,
The digital radio receiver according to claim 2, wherein the determined sound effect is added to the sound effect table in association with broadcast station information and category information.

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