JP2004047005A - Audio recording device and audio broadcast receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rationalize the relation between the recording quality of audio data and consumption quantity of the capacity of a storage medium, in an audio recording device. <P>SOLUTION: A control section 1 obtains EPG (electronic program guide) information separated and extracted from the received data of a tuner 5 by a data separating section 6, refers to a genre classification corresponding table 202 and determines that the classification to which a genre of a program to be recorded belongs to which classification such as music, mix, talk, or the like previously set. And recording quality of classification to which a program from a recorded quality definition table 201 is obtained, and set to an audio CODEC 12. The audio CODEC 12 compresses and encodes audio data of a program to be recorded decoded by a voice decoding section 7 with set recording quality, and records it in a hard disk drive 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology for controlling the quality of audio data to be recorded in an audio recording device that records audio data.
[0002]
[Prior art]
2. Description of the Related Art As an audio recording device that records audio data, an audio recording device that uses an MD or an audio tape as a storage medium for audio data is conventionally known. In recent years, an audio recording device that records audio data on a large-capacity storage medium such as a hard disk is also known.
[0003]
As such an audio recording device, there is known an audio recording device which compresses and encodes audio data at a predetermined compression rate by a predetermined compression encoding method and records the data.
[0004]
[Problems to be solved by the invention]
Since the compression ratio of audio data and the quality of audio data are usually inversely proportional, there is a trade-off between the quality of audio data to be recorded and the amount of recording resources used for recording audio data. Is recorded, the consumption of the storage capacity of the storage medium becomes large, and in order to keep the consumption of the storage capacity of the storage medium small, the quality of the audio data to be recorded must be kept low.
[0005]
On the other hand, the quality required by the user for audio data is not always the same for all audio data. In other words, a general user demands high quality for something that has value in the sound itself, such as music, but has high sound quality for something that has value in the information transmitted, such as news sound. Often it is acceptable even if the quality is not so high.
[0006]
For this reason, according to the conventional audio recording apparatus that compresses and records audio data at a predetermined compression rate and records the audio data with low quality, the audio data that the user desires high quality is A problem arises in that audio data is recorded only due to insufficient recording quality. Conversely, if audio data is recorded with high quality, the user may not record audio data that does not require high quality. Wastes the storage capacity of the storage medium.
[0007]
Therefore, it is an object of the present invention to optimize the relationship between the recording quality of audio data and the consumption of storage capacity of a storage medium in an audio recording device.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides, for example, audio data acquiring means for acquiring audio data, genre information acquiring means for acquiring genre information representing a genre of the audio data, and compression-encoded audio data. A storage medium for recording, compression encoding means for compressing and encoding the audio data acquired by the audio data acquiring means, and a compression rate variable, and audio data compressed and encoded by the compression encoding means being recorded on the storage medium Recording quality control for switching the compression rate in the compression encoding means according to the genre of the audio data to be compression encoded by the compression encoding means, represented by the genre information acquired by the genre information acquisition means. And an audio recording device.
[0009]
According to such an audio recording device, for each genre to which the audio data belongs, each audio data can be recorded at an appropriate compression ratio according to the genre. Therefore, audio data of a genre that the user considers sound quality to be important is recorded at a high recording quality so that the user is satisfied, while audio data of another genre for which the sound quality is not relatively important is recorded at a relatively low recording quality. By recording in, the consumption of storage capacity due to recording of audio data can be suppressed.
[0010]
Also, the present invention provides an audio broadcast receiving apparatus for achieving the above object, comprising: an audio broadcast receiving means for receiving an audio broadcast for broadcasting audio data; a broadcast time of each program broadcasted by the audio broadcast; Electronic program guide acquisition means for acquiring an electronic program guide, which is an electronic program guide including at least information on a genre to which the genre belongs, a storage medium for recording compression-encoded audio data, and audio broadcast reception means. Compression encoding means for compressing and encoding audio data, a variable compression rate, recording processing means for recording the audio data compressed and encoded by the compression encoding means on the storage medium, and the electronic program guide acquisition means; Audio data represented by the acquired electronic program guide and compressed and encoded by the compression encoding means. Depending on the genre belongs program of, providing audio broadcast receiving apparatus characterized by having a recording quality control means for switching the compression ratio in the compression encoding unit.
[0011]
According to another aspect of the present invention, there is provided another audio broadcast receiving apparatus for receiving the audio broadcast that broadcasts audio data and genre information indicating a genre to which the audio data belongs, and compression encoding. A storage medium for recording the audio data, the compression encoding means for compressing and encoding the audio data received by the audio broadcast receiving means, the compression encoding means having a variable compression rate, and the audio data compressed and encoded by the compression encoding means. Recording processing means for recording on the storage medium, and the compression encoding means in accordance with a genre to which the audio data to be compressed and encoded by the compression encoding means, represented by the genre information received by the audio broadcast receiving means, Recording quality control means for switching the compression ratio. To provide a I o broadcast receiver.
[0012]
According to these audio broadcast receiving apparatuses, each audio data can be recorded at an appropriate compression rate for each genre to which the audio data belongs, using genre information broadcast together with the electronic program guide and the audio data. Therefore, audio data of a genre that the user considers sound quality to be important is recorded at a high recording quality so that the user is satisfied, while audio data of another genre for which the sound quality is not relatively important is recorded at a relatively low recording quality. By recording in, the consumption of storage capacity due to recording of audio data can be suppressed.
[0013]
Here, in these audio broadcast receiving apparatuses, at least one genre other than music and music is provided as the genre, and the recording quality control means corresponds to the audio data to be compression-encoded by the compression-encoding means. When the genre is music, it is preferable that the compression rate of the audio data in the compression encoding unit is switched to the lowest compression rate among a plurality of compression rates switched according to the genre. By doing so, audio data of music in which sound quality is the most important factor is recorded at a high recording quality to satisfy the user, while audio data of another genre in which sound quality is not a relatively important factor. By recording with relatively low recording quality, consumption of storage capacity due to recording of audio data can be suppressed.
[0014]
Further, a recording quality table describing the correspondence between the genre and the compression ratio, and editing means for editing the correspondence between the genre and the compression ratio of the recording quality table in accordance with a user operation, wherein the recording quality control means comprises: The compression rate in the compression encoding means may be switched to a compression rate associated with the genre to which the audio data to be compression encoded by the compression encoding means belongs in the recording quality table.
[0015]
By doing so, the user can set or change the correspondence between the genre and the recording quality for recording audio data of the genre according to his / her preference.
In addition, each of the above devices may record content data or program data containing at least one of video and audio instead of audio data, for example. The compression ratio may be determined according to the genre of the data, and the content data and the program data may be compression-encoded and recorded.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described taking an example of application to a system for recording audio data received by a digital audio broadcast receiver.
FIG. 1 shows a configuration of a digital audio broadcast receiver according to the present embodiment.
As shown, the digital audio broadcast receiver includes a control unit 1, a hard disk drive 2, a memory 3, an antenna 4, a tuner 5, a data separation unit 6, an audio decoding unit 7, an output selector 8, a D / A converter 9, An amplifier 10, a speaker 11, an audio codec 12, an operation unit 13, a display control unit 14, a display unit 15, and the like are provided.
[0017]
The tuner 5 extracts a desired frequency component from the broadcast wave received by the antenna 4, converts the frequency component into an intermediate frequency signal, and outputs the intermediate frequency signal. The tuner 5 performs quadrature demodulation processing, deinterleaving processing, A baseband processing unit 52 that performs processing according to a broadcast system such as multiplex demodulation and error correction to restore broadcast payload data.
[0018]
Further, a recording quality definition table 201, a genre classification correspondence table 202, a recording reservation table 203, genre extraction information 204, EPG information 205, and an audio file 206 are recorded on the hard disk drive 2.
In FIG. 1, thick lines in FIG. 1 indicate audio data paths, and thin lines indicate control information and signal paths. In addition, the tuner 5 and the data separation unit 6 are configured to be able to process a plurality of channels in parallel.
However, the above digital audio broadcast receiver may be configured using a general computer to which a tuner card or the like that adds a tuner function to the computer is connected. At least a part of the unit 1, the audio codec 12, the output selector 8, the audio decoding unit 7, the data separation unit 6, and the like are realized as a process embodied by a computer executing a program. There may be. In this case, the program may be supplied to the computer from a recording medium on which the program is recorded.
[0019]
Here, a digital audio broadcast to be received by the digital audio broadcast receiver in the present embodiment will be described.
Digital audio broadcast receivers receive digital broadcasts from a plurality of different broadcasting systems.
[0020]
A plurality of broadcast systems to be received in the present embodiment include, for example, a broadcast system that broadcasts message information together with audio data as shown in FIG. 2 and an EPG (electronic program guide) data as shown in FIG. And a broadcasting system for broadcasting the audio data together with the audio data.
[0021]
In the broadcasting system shown in FIG. 2, a sequence of packets is transmitted in each channel as shown in FIG. 2A. Each packet includes message information and audio data as shown in FIG. 2b. The audio data is stored in a data compressed form. On the other hand, the message information includes content information indicating information of a content formed by audio data being broadcast on the channel, and the content information indicates a genre such as music or news of the content formed by the audio data being broadcast. The content genre and other content information are included.
[0022]
On the other hand, in the broadcasting system shown in FIG. 3, a sequence of packets is transmitted in each channel as shown in the figure, but a channel for data broadcasting is provided in addition to a channel for content broadcasting. . Each packet of the channel for content broadcasting stores audio data in a compressed form. On the other hand, EPG data is stored in a packet of a channel for data broadcasting. The EPG data is data representing information of a program broadcast on each content broadcasting channel, and a set of EPG data can create a program table for a certain period. That is, for example, as shown in the figure, the EPG data corresponding to one program includes a broadcast station name for broadcasting the program, a channel number of a channel on which the program is broadcast, a broadcast start date and time and an end date and time, and It includes the genre such as music and news to which the program belongs, the title of the program, and other program information.
[0023]
In the present embodiment, the broadcasting system to be received by the digital audio broadcasting receiver does not transmit such EPG data on a data broadcasting channel, but uses time division of the EPG data with audio data on each content channel. It may be a broadcasting system that multiplexes and transmits. In the present embodiment, the broadcast system to be received by the digital audio broadcast receiver may be a broadcast system that broadcasts both such EPG data and message information.
[0024]
Now, returning to FIG. 1, the normal reception output operation of the digital audio broadcast receiver is as follows.
That is, the tuner 5 receives the output target channel, demodulates the payload of the output target channel, and outputs the demodulated data to the data separation unit 6. The data separation unit 6 extracts information data such as EPG data and message information from the payload data of each channel received from the tuner 5, and outputs the information data to the control unit 1. Further, the data separation unit 6 extracts audio data from the payload data of the output target channel received from the tuner 5 and outputs the audio data to the audio decoding unit 7.
[0025]
The audio decoding unit 7 decodes the audio data of the output target channel and outputs it to the output selector 8. The output selector 8 selects the audio data input from the audio decoding unit 7, and outputs the data to the D / A converter 9. Output to The D / A converter 9 converts the audio data input via the output selector 8 into an analog signal, and outputs the analog signal to the speaker 11 via the amplifier 10.
[0026]
On the other hand, the control unit 1 uses the information data sent from the data separation unit 6 to display information indicated by the message information of the output target channel on the display unit 15 while using the memory 3, A process for switching the output target channel in accordance with an operation from the unit 13 is performed.
[0027]
Hereinafter, an audio data recording operation in such a digital audio broadcast receiver will be described.
As described above, the recording quality definition table 201, the genre classification correspondence table 202, the recording reservation table 203, the genre extraction information 204, the EPG information 205, and the audio file 206 are recorded on the hard disk drive 2.
[0028]
The audio file 206 is a file in which audio data received from digital audio broadcasting is compression-encoded and stored. The EPG information 205 stores the EPG information 205 received from the broadcasting system for each broadcasting system, and the control unit 1 controls the tuner 5 and the data separation unit 6 as needed to control the EPG information of each broadcasting system. A process for receiving the data and updating the EPG information 205 is performed.
[0029]
The genre extraction information 204 is information describing how to extract the genre of audio data broadcast by the broadcasting system for each broadcasting system. For example, message information as shown in FIG. 2 is transmitted. For a broadcast system, it is described that the broadcast system broadcasts message information and that the genre of audio data should be extracted from the content genre of the message information. Also, for a broadcasting system that transmits EPG data as shown in FIG. 3, it is necessary that the broadcasting system broadcasts EPG data and the genre of audio data should be extracted from the genre of the EPG data. Is described.
[0030]
Next, for example, as shown in FIG. 4A, the recording quality definition table 201 includes a sampling frequency and a bit rate to be applied when recording audio data of three categories of music, mix, and talk of audio data as an audio file 206. It is described in advance. As shown in FIG. 4B, the genre classification correspondence table 202 includes, for each broadcast system, the name of the content genre of message information or the genre of EPG data used in the broadcast system and the music defined by the recording quality definition table 201. , Mix, and talk are described in advance. As shown in the figure, in the present embodiment, the genre of a program or content centered on music is classified music, and the genre of a program or content centered on speech such as news or sports is classified as a talk, and when music and speech are used together. The genre of programs and contents, such as expected movies and dramas, is classified. Then, a sampling frequency and a bit rate corresponding to each classification are defined so that the recording quality is improved in the order of talk, mix, and music.
[0031]
Here, the correspondence between the classification, the sampling frequency, and the bit rate in the recording quality definition table 201 and the correspondence between the content genre or the genre of the EPG data and the classification in the genre classification correspondence table 202 can be arbitrarily edited by the user. It may be. For such editing, for example, the control unit 1 stores a recording quality definition table 201 and a genre classification correspondence table 202 as shown in FIG. 4 in response to an editing request from the user via the operation unit 13. 2, an editing screen including the display of the contents is displayed on the display unit 15 via the display control unit 14, and on this display screen, editing of the contents of each table from the user via the operation unit 13 is accepted. By editing each table and updating the recording quality definition table 201 and the genre classification correspondence table 202 on the hard disk drive 2 with the edited contents, this can be performed.
[0032]
Finally, the recording reservation table 203 is a table for registering recording contents of recording of audio data received from the user. Details of the recording reservation table 203 will be described later.
The control unit 1 performs a recording reservation receiving process for receiving a recording reservation of the audio data from the user, a recording reservation executing process for executing the recording of the audio data according to the received recording reservation, and Three processes of an immediate recording process for receiving a recording instruction and executing recording of audio data are performed.
[0033]
Hereinafter, each of these processes will be described.
First, the recording reservation receiving process will be described.
FIG. 5 shows the procedure of the recording reservation receiving process.
As shown in the figure, in this processing, the input of a recording reservation request by the user via the operation unit 13 is monitored (step 502), and if the recording reservation request is input, for example, a broadcasting system as shown in FIG. A selection screen display is displayed on the display unit 15 via the display control unit 14 (step 504), and a selection of a broadcast system for broadcasting audio data for which recording is scheduled is accepted. Then, when the selection of the broadcast system is received (step 506), it is determined with reference to the genre extraction information 204 whether the selected broadcast system is a broadcast system for broadcasting EPG data (step 508). If the broadcast system does not broadcast EPG data, a reservation setting screen as shown in FIG. 6B is displayed (step 522). Then, on the reservation setting screen, the setting of the channel number of the channel for broadcasting the audio data for which recording is to be reserved, the recording start date and time, and the end date and time is accepted (step 524), the identification of the broadcasting system accepted in step 506, and the reservation setting The reservation data including the channel number, recording start date and time, and recording end date and time accepted on the screen is generated (step 526), and registered in the recording reservation table 203 (step 520). Then, the process returns to step 502 to monitor the input of the next recording reservation request.
[0034]
On the other hand, if it is determined in step 508 that the broadcast system that has received the selection is a broadcast system that broadcasts EPG data, first, EPG information 205 of the broadcast system is acquired (step 510). Further, a program guide of the broadcast system is generated from the acquired EPG information 205 (step 512), and, for example, a program guide screen as shown in FIG. 6C is displayed on the display unit 15 via the display control unit 14 (step 512). Step 516).
[0035]
Then, when the designation of a program for which recording is to be reserved is received on the program guide screen (step 516), the EPG data of the received program is used to set the channel number, broadcast start date and time and broadcast end date and time of the received program. A genre and a title are acquired, and a category corresponding to the acquired genre is extracted with reference to the genre category correspondence table 202. Further, the broadcast start date and time and the broadcast end date and time are set as the recording start date and time and the record end date and time, and a character string obtained by concatenating the title and the recording start date and time is set as the record title. The reservation data including the classified data is generated (step 518) and registered in the recording reservation table 203 (step 520). Then, the process returns to step 502 to monitor the input of the next recording reservation request.
[0036]
Here, FIG. 7 shows an example of the recording reservation table 203 in which the reservation data is registered by the recording reservation accepting process described above.
As shown in the drawing, the recording reservation table 203 can register a plurality of pieces of reservation data having items of recording start date and time, recording end date and time, broadcasting system, channel number, classification, and recording title. Then, the classification and the recording title are set in the reservation data for the program broadcast by the broadcast system that broadcasts the EPG data. On the other hand, the classification and the recording title are not set in the reservation data for audio data broadcast by a broadcasting system that does not broadcast EPG data.
[0037]
The recording reservation receiving process has been described above.
Next, the recording reservation execution processing will be described.
FIG. 8A shows the procedure of the recording reservation execution process.
As shown in the figure, in this processing, it is checked whether or not there is reserved data whose recording start date and time coincides with the current date and time in the recording reserved table 203 (step 802). The recording process is started (step 804), and thereafter, this process is repeated.
[0038]
Then, as shown in FIG. 8B, in the recording process started in step 804, first, the channel of the channel number described in the reservation data of the broadcasting system described in the reservation data to be processed is set as the recording target channel. , The tuner 5 is instructed to receive the recording target channel, the data separation unit 6 outputs the audio data of the recording target channel to the audio decoding unit 7, and the audio decoding unit 7 decodes and decodes the audio data of the recording target channel. The audio data is transferred to the audio codec 12 (step 850).
[0039]
Then, it is checked whether a classification is set in the reservation data (step 852). If the classification is set, a sampling frequency and a bit rate corresponding to the set classification are obtained with reference to the recording quality table, and the audio quality is determined. An audio file that is set in the codec 12, starts compression encoding based on the sampling frequency and bit rate set for the audio codec 12, and sets the recording title described in the reserved data as a file name for the hard disk drive 2. The audio data generated by the audio codec 12 is stored in the generated audio file 206 (step 854). Here, the audio codec 12 encodes and decodes audio data using MP3 (MPEG1 Audio Layer 3) or another compression encoding method with a variable compression ratio.
[0040]
When the current date and time becomes the recording end date and time of the reservation data to be processed (step 856), the control unit 1 terminates the storage of the audio data in the audio file 206 (step 858). The target reservation data is deleted from the recording reservation table 203 (step 860), and the process ends.
[0041]
On the other hand, if the classification is not set in the reservation data in step 852, the content genre of the message information of the recording target channel is acquired from the data separation unit 6 (step 862). Then, if the content genre can be acquired (step 864), the classification corresponding to the acquired content genre is determined by referring to the genre classification correspondence table 202, and the sampling corresponding to the classification determined by referring to the recording quality table is performed. A frequency and a bit rate are obtained and set in the audio codec 12, compression encoding is started by the sampling frequency and the bit rate set for the audio codec 12, and the hard disk drive 2 has a broadcast system and channel An audio file 206 in which a character string obtained by concatenating a number and a recording disclosure date and the like is set as a file name is generated, and the generated audio file 206 stores audio data compressed and encoded by the audio codec 12 (step 8). 6).
[0042]
When the current date and time becomes the recording end date and time of the reservation data to be processed (step 856), the storage of the audio data in the audio file 206 is terminated (step 858), and the reservation data to be processed is stored in the recording reservation table 203. (Step 860), and the process ends.
[0043]
If the content genre of the message information cannot be obtained in step 864, the sampling frequency and bit rate corresponding to the classification mix are obtained by referring to the recording quality table and set in the audio codec 12, and the audio codec is set. Then, compression encoding based on the set sampling frequency and bit rate is started for the hard disk drive 12, and a character string obtained by concatenating the broadcast system of reserved data, the channel number, and the recording start date and time is set as a file name in the hard disk drive 2. The generated audio file 206 is generated, and the generated audio file 206 stores the audio data compressed and encoded by the audio codec 12 (step 868).
[0044]
When the current date and time becomes the recording end date and time of the reservation data to be processed (step 856), the storage of the audio data in the audio file 206 is terminated (step 858), and the reservation data to be processed is stored in the recording reservation table 203. (Step 860), and the process ends.
[0045]
The recording reservation execution processing has been described above.
The above-described recording reservation accepting process and recording reservation executing process are background processes performed in parallel with the above-described normal reception output operation.
Hereinafter, the immediate recording process will be described.
FIG. 9 shows the procedure of the immediate recording process.
As shown in the figure, in this processing, the input of a recording request by the user via the operation unit 13 is monitored (step 902), and when the recording request is input, the decoded audio data of the output target channel is output to the audio codec. It is also transferred to the audio codec 12 (step 904). Further, the identification of the broadcast system and the channel which is the current output target is obtained (step 906), and whether or not the broadcast system which is the output target is the broadcast system for broadcasting the EPG data is determined by referring to the genre extraction information 204. A determination is made (step 908).
[0046]
Then, if the broadcast system broadcasts the EPG data, the EPG information 205 of the broadcast system is acquired (step 910). Then, the genre and title of the program currently being output are extracted from the acquired EPG information 205. Then, a classification corresponding to the extracted genre is determined by referring to the genre classification table, a sampling frequency and a bit rate corresponding to the determined classification are determined, the audio codec 12 is set, and the sampling set for the audio codec 12 is set. The compression encoding based on the frequency and the bit rate is started, and the hard disk drive 2 generates an audio file 206 in which a character string obtained by concatenating the extracted title and the current date and time is set as a file name. The audio codec 12 stores the audio data compressed and encoded (step 912).
[0047]
On the other hand, if it is determined in step 908 that the broadcast system is not a broadcast system for broadcasting EPG data, the content genre of the message information of the output target channel is acquired from the data separation unit 6 (step 920). If the content genre has been acquired (step 922), the classification corresponding to the acquired content genre is determined with reference to the genre classification correspondence table 202, and the sampling corresponding to the classification determined with reference to the recording quality table is performed. A frequency and a bit rate are obtained and set in the audio codec 12, compression encoding is started by the sampling frequency and the bit rate set for the audio codec 12, and the broadcasting system and the channel being output are transmitted to the hard disk drive 2. An audio file 206 in which a character string obtained by concatenating the number and the current date and time are set as a file name is generated, and the generated audio file 206 stores audio data compressed and encoded by the audio codec 12 (step 924). )
[0048]
If the content genre of the message information cannot be acquired in step 922, the sampling frequency and bit rate corresponding to the classification mix are obtained by referring to the recording quality table and set in the audio codec 12, and The compression encoding based on the sampling frequency and the bit rate set for the codec 12 is started, and the hard disk drive 2 stores, as a file name, a character string obtained by concatenating the broadcasting system being output, the channel number, and the recording disclosure date and time. The set audio file 206 is generated, and the generated audio file 206 stores audio data compressed and encoded by the audio codec 12 (step 926).
[0049]
Then, when a recording end instruction is input from the user via the operation unit 13 (step 916), the storage of the audio data in the audio file 206 is ended (step 918), and the process returns to step 902 to request the next recording request. Monitor input. On the other hand, if the user instructs to switch the output target channel via the operation unit 13 before the recording end instruction is input (step 914), the storage of the audio data in the audio file 206 ends (step 914). Step 928), in the normal reception output operation, instruct the tuner 5 and the data separation unit 6 to switch the output target channel, and repeat the processing from step 906.
[0050]
The immediate execution process has been described above.
The audio files 206 recorded on the hard disk drive 2 as described above are reproduced at any time in accordance with a user's instruction.
That is, when the control unit 1 receives an instruction to display an audio file list from the user via the operation unit 13, the control unit 1 displays a file list display screen including a list of file names of the audio files 206 recorded in the hard disk drive 2. It is displayed on the display unit 15 via the display control unit 14 and receives designation of the audio file 206 to be reproduced on the display screen. Then, the audio data stored in the specified audio file 206 is read out from the hard disk drive 2, supplied to the audio codec 12 for decoding, and the output audio data of the audio codec 12 is selectively output to the output selector 8. . The audio data decoded by the audio codec 12 is output to the D / A converter 9 via the output selector 8 to be converted into an analog signal, and is output from the amplifier 10 to the speaker 11.
[0051]
The embodiments of the present invention have been described above.
In the above embodiment, the application to a digital audio broadcast receiver has been described as an example. However, a technique for controlling the recording quality of audio data according to the genre of the content of audio data as described above. Is similarly applicable to any audio recording device capable of acquiring the genre of audio data.
In the above description, the hard disk drive 2 is used as a recording medium for recording audio data. However, as a recording medium for recording audio data, a portable semiconductor storage device having a card shape or a stick shape, a semiconductor storage device such as a RAM, etc. An arbitrary storage medium such as an element, an MD, or another portable disk-shaped storage medium can be used.
[0052]
Further, the above digital audio broadcast receiver may acquire the above-mentioned EPG data not through digital audio broadcasting in which audio data is broadcast, but through another communication channel such as the Internet. The self may be obtained via the Internet.
[0053]
In addition, the technology of controlling the recording quality of content according to the genre of broadcast content in the digital audio broadcast receiver can be similarly applied to the case of receiving content other than audio data. For example, in a receiver for receiving a television broadcast, recording may be performed while switching the recording quality of at least one of video data and audio data of the program content in accordance with the genre of the program.
[0054]
【The invention's effect】
As described above, according to the present invention, in the audio recording device, the relationship between the recording quality of audio data and the consumption of the storage capacity of the storage medium can be optimized.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a digital audio broadcast receiver according to an embodiment of the present invention.
FIG. 2 is a diagram showing an example of a digital audio broadcast broadcast format targeted by the digital audio broadcast receiver according to the embodiment of the present invention.
FIG. 3 is a diagram showing an example of a digital audio broadcast broadcast format targeted by the digital audio broadcast receiver according to the embodiment of the present invention.
FIG. 4 is a diagram showing contents of a recording quality definition table and a genre classification correspondence table used in the embodiment of the present invention.
FIG. 5 is a flowchart illustrating a procedure of a recording reservation receiving process according to the embodiment of the present invention.
FIG. 6 is a diagram showing an example of a display screen of the digital audio broadcast receiver according to the embodiment of the present invention.
FIG. 7 is a diagram showing contents of a recording reservation table according to the embodiment of the present invention.
FIG. 8 is a flowchart illustrating a procedure of a recording reservation execution process according to the embodiment of the present invention.
FIG. 9 is a flowchart illustrating a procedure of an immediate recording process according to the embodiment of the present invention.
[Explanation of symbols]
1: control unit, 2: hard disk drive, 3: memory, 4: antenna, 5: tuner, 6: data separation unit, 7: audio decoding unit, 8: output selector, 9: D / A converter, 10: amplifier , 11: speaker, 12: audio codec, 13: operation unit, 14: display control unit, 15: display unit, 16: control unit, 51: front end unit, 52: baseband processing unit, 201: recording quality definition table , 202: genre classification correspondence table, 203: recording reservation table, 204: genre extraction information, 205: EPG information, 206: audio file.

Claims (11)

Audio data acquisition means for acquiring audio data;
Genre information acquisition means for acquiring genre information representing the genre of the audio data,
A storage medium for recording compression-encoded audio data,
Compression encoding the audio data acquired by the audio data acquisition means, a compression encoding means having a variable compression rate,
Recording processing means for recording the audio data compressed and encoded by the compression encoding means on the storage medium,
Recording quality control means for switching a compression ratio in the compression encoding means in accordance with a genre of audio data compressed and encoded by the compression encoding means, represented by genre information acquired by the genre information acquisition means. An audio recording device characterized by the following. Audio broadcast receiving means for receiving an audio broadcast for broadcasting audio data;
Electronic program guide acquisition means for acquiring an electronic program guide which is an electronic program guide including at least information on a broadcast time of each program broadcast in the audio broadcast and a genre to which each program belongs,
A storage medium for recording compression-encoded audio data,
Compression encoding of audio data received by the audio broadcast receiving means, a compression encoding means having a variable compression rate,
Recording processing means for recording the audio data compressed and encoded by the compression encoding means on the storage medium,
A recording quality control unit that switches a compression ratio in the compression encoding unit according to a genre of a program to which the audio data to be compression-encoded by the compression encoding unit is represented by the electronic program guide acquired by the electronic program guide acquisition unit; An audio broadcast receiving device comprising: The audio broadcast receiving device according to claim 2,
Program guide display means for displaying the program guide of the audio broadcast based on the electronic program guide acquired by the electronic program guide acquisition means,
Recording program receiving means for receiving, from a user, designation of a recording target program using the program table displayed by the program table display means,
An audio broadcast receiving apparatus comprising: a recording control unit that converts audio data of a program received by the recorded program reception unit into audio data to be compression-encoded by the compression encoding unit. Audio broadcast receiving means for receiving an audio broadcast for broadcasting audio data and genre information indicating a genre to which the audio data belongs;
A storage medium for recording compression-encoded audio data,
Compression encoding of audio data received by the audio broadcast receiving means, a compression encoding means having a variable compression rate,
Recording processing means for recording the audio data compressed and encoded by the compression encoding means on the storage medium,
Recording quality control means for switching a compression rate in the compression encoding means according to a genre to which the audio data to be compressed and encoded by the compression encoding means belongs, which is represented by the genre information received by the audio broadcast receiving means. An audio broadcast receiving apparatus characterized by the above-mentioned. The audio broadcast receiving device according to claim 2, 3, or 4,
The genre includes music and at least one genre other than music.If the genre corresponding to the audio data to be compression-encoded by the compression-encoding means is music, the recording quality control means An audio broadcast receiving apparatus, wherein the compression rate of audio data in the compression encoding means is switched to the lowest compression rate among a plurality of compression rates to be switched. The audio broadcast receiving apparatus according to claim 2, 3, 4, or 5,
A recording quality table describing the correspondence between the genre and the compression ratio,
Editing means for editing the correspondence between the genre and the compression ratio of the recording quality table in accordance with a user operation,
The recording quality control unit switches the compression ratio in the compression encoding unit to a compression ratio associated with the genre to which the audio data to be compression-encoded by the compression encoding unit belongs in the recording quality table. Audio broadcast receiving device. A recording quality control method for controlling the recording quality of a storage medium of content data that is data of content including at least one of video and audio,
Obtaining content data;
Acquiring genre information indicating a genre of the content data;
A step of setting the recording quality of the content data to a recording quality determined according to the genre of the content data represented by the acquired genre information among the plurality of recording qualities, and realizing the set recording quality of the acquired content data. Compression encoding at a compression ratio
Recording the compression-encoded audio data on the storage medium. A recording quality control method for controlling the recording quality of program data, which is data of a program including at least one of video and audio, on a storage medium,
Receiving a broadcast of the program data;
Obtaining an electronic program guide that is an electronic program guide including at least information on the broadcast time of each broadcasted program and the genre to which each program belongs;
Setting the recording quality of the program data to a recording quality determined by the genre of the program of the program data to be recorded, which is represented by the electronic program guide acquired by the electronic program guide acquiring means of the plurality of recording qualities;
Compressing and encoding the program data received by the broadcast receiving means at a compression ratio that achieves a set recording quality;
Recording the compression-encoded audio data on the storage medium. A computer program read and executed by a computer,
The computer program is stored in the computer,
Obtaining content data that is data of content including at least one of video and audio;
Acquiring genre information indicating a genre of the content data;
A step of setting the recording quality of the content data to a recording quality determined according to a genre of the content data represented by the acquired genre information of the plurality of recording qualities, and realizing the set recording quality of the acquired content data. Compression encoding at a compression ratio;
Recording the compression-encoded audio data on the storage medium. A computer program read and executed by a computer,
The computer program is stored in the computer,
Receiving a broadcast of program data that is data of a program including at least one of video and audio;
Obtaining an electronic program guide that is an electronic program guide including at least information on the broadcast time of each broadcasted program and the genre to which each program belongs;
Setting the recording quality of the program data to a recording quality determined by the genre of the program of the program data to be recorded, which is represented by the electronic program guide acquired by the electronic program guide acquiring means of the plurality of recording qualities;
Compressing and encoding the program data received by the broadcast receiving means at a compression ratio that achieves a set recording quality;
Recording the compression-encoded audio data on the storage medium. A computer-readable recording medium recording the computer program according to claim 9.

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