JP5028321B2 - Music recording / reproducing apparatus and music recording / reproducing apparatus having navigation function - Google Patents

Description

  The present invention provides a music recording / reproducing apparatus having a television broadcast receiving function compatible with analog broadcasting and digital broadcasting, a radio broadcast receiving function compatible with AM broadcasting and FM broadcasting, and the like, capable of receiving, recording and reproducing music contents. In particular, in a music recording / reproducing apparatus capable of receiving a broadcast containing music content and recording the music content in a storage unit made up of a hard disk, the reception level of the broadcast being received, for example, Only when the received electric field strength exceeds a predetermined level or a stereo signal included in the demodulated signal obtained by the broadcast receiving unit can be detected, frequency analysis of the demodulated signal obtained by the broadcast receiving unit is performed to determine the music content. The present invention relates to a music recording / reproducing apparatus.

  Recently, various electronic devices such as navigation devices, music players, DVD players, television receivers compatible with analog broadcasting and digital broadcasting have been miniaturized and provided as portable devices or as in-vehicle devices. . In particular, as a vehicle-mounted device, an electronic device having a combination of the various functions described above is also provided.

  For example, as disclosed in the following Patent Document 1 (Japanese Patent Laid-Open No. 2003-130669), an in-vehicle navigation device uses map data in which a required link cost is set, and links set for each link. Based on the cost, a route that minimizes the cumulative link cost from the starting point to the destination is searched for and guided.

  In addition, in-vehicle navigation devices, many devices having both a television broadcast receiving function corresponding to analog broadcasting and digital broadcasting and a radio broadcast receiving function corresponding to AM broadcasting and FM broadcasting are provided.

  In such a navigation device, map data for route search and map display is stored in the hard disk unit. Recently, since the storage capacity of the hard disk unit has increased dramatically, a navigation device has also been proposed that can store content such as broadcast music data received using a part of the hard disk unit that stores map data. Yes.

  Usually, the music content recorded on a CD or DVD is recorded in the storage unit in the playback device while reproducing the music content, or the music content contained therein is recorded in the recording unit in the broadcast receiving device. If the music content data being played back or the broadcast signal received by the broadcast receiving unit is converted into digital data and only the music data is extracted by the music extracting unit, the data is temporarily recorded in the RAM, and one piece of music is recorded. When completed, the music data of the music is recorded in a storage unit comprising a hard disk.

  For example, in the following Patent Document 2 (Japanese Patent Laid-Open No. 2006-277792), when music data compression processing and playback processing are executed in parallel, the compressed music data that has been subjected to compression processing is temporarily and sequentially converted into a DSP. Is stored in the work RAM 16 and a reproduction process is executed based on the compressed music data stored in the DSP work RAM. When the music data compression process for one song is completed, the work RAM for the DSP is used. An information recording / reproducing apparatus is disclosed in which stored compressed music data is transferred to and stored in a hard disk drive.

  On the other hand, a recording / playback apparatus that receives a radio broadcast and records a musical piece of music content is disclosed, for example, in the following Patent Document 3 (Japanese Patent Laid-Open No. 2006-99854) as an invention of a radio broadcast recording / playback apparatus. Has been. This radio broadcast recording / playback apparatus is configured to analyze a frequency of a received broadcast radio wave and extract and record a music content portion.

That is, this radio broadcast recording / playback apparatus selects a broadcast station using a radio tuner, detects information related to individual contents included in the radio broadcast, and detects information related to the detected content and the radio broadcast. The contents are stored in the music recording memory in association with each other, the contents are extracted by the information related to the contents detected by the contents reproducing unit, and the contents are sent and played back. When the content is music, the content detection unit classifies the music part and the conversation part such as DJ by frequency analysis, extracts the music part, acquires the song information and time information from the broadcast station information acquisition unit, associates them, Music content data is compressed by a data compression unit as necessary and output to a radio broadcast recording memory.
JP 2003-130669 A JP 2006-277792 A JP 2006-99854 A

  When the music recording / playback apparatus receives a broadcast such as an FM broadcast and records music content included in the broadcast, the technique disclosed in Patent Document 3 can be applied. In general, human speech has a relatively low frequency, and it is possible to separate the music part from the talk program, narration, DJ part, etc. by identifying whether it is above a certain judgment frequency level and analyzing the frequency, Only the music content part can be extracted from the broadcast.

  However, when extracting the music content part by analyzing the frequency of the demodulated signal obtained by the broadcast receiving unit, if the electric field strength of the received radio wave is small, the music part and the talk part cannot be separated only by the frequency analysis. Arise. That is, there is a problem in that noise components including frequencies above a certain determination frequency tend to increase when the broadcast reception state deteriorates, which makes it difficult to extract music content. The technology disclosed in Patent Document 3 above It is not possible to solve this problem simply by applying.

  As a result of various studies to solve the above problems, the inventor of the present application is a music recording / reproducing apparatus capable of receiving a broadcast containing music content and recording the music content in a storage unit composed of a hard disk. The reception level of the broadcast radio wave of the broadcast being received, for example, the broadcast reception unit only when the reception electric field strength of the broadcast radio wave is equal to or higher than a predetermined level or the stereo signal included in the demodulated signal obtained by the broadcast reception unit can be detected The present invention has been completed by conceiving that the above-mentioned problems can be solved if the determination of the music content is performed by frequency analysis of the demodulated signal obtained in the above.

  That is, the present invention has an object to solve the above problems, and a music recording / playback apparatus and a music recording / playback function having a navigation function capable of easily extracting and recording and playing back music content from a received radio broadcast. The object is to provide an apparatus.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
In a music recording / reproducing apparatus including a broadcast receiving unit that receives a broadcast, a recording unit that records the content of the received broadcast, and a control unit,
The music recording / reproducing apparatus includes: an electric field strength determination unit that determines whether or not a reception intensity of a broadcast radio wave received by the broadcast reception unit is equal to or higher than a predetermined electric field strength; and a demodulation obtained by the broadcast reception unit. A frequency analysis unit that analyzes the frequency of the signal and determines whether or not the frequency is music content,
When the electric field strength determination unit determines that the broadcast radio wave reception strength is equal to or higher than a predetermined electric field strength, the frequency analysis unit performs frequency analysis of the demodulated signal and determines whether the frequency is music content. If the frequency analysis unit determines that the frequency is music content, the control unit extracts the music content and records the music content in the recording unit.

The invention according to claim 2 of the present application is
In a music recording / reproducing apparatus including a broadcast receiving unit that receives a broadcast, a recording unit that records the content of the received broadcast, and a control unit,
The music recording / reproducing apparatus includes: a stereo signal detecting unit that detects presence / absence of a stereo signal included in the demodulated signal obtained by the broadcast receiving unit; and analyzing the frequency of the demodulated signal to determine whether the frequency is music content. A frequency analysis unit for determining whether or not
When a stereo signal included in the demodulated signal is detected by the stereo signal detector, the frequency analyzer performs a frequency analysis of the demodulated signal to determine whether the frequency is music content, When the frequency analysis unit determines that the frequency is music content, the control unit extracts the music content and records it in the recording unit.

  According to a third aspect of the present invention, in the music recording / reproducing apparatus according to the first aspect, the electric field strength determination unit determines that the reception strength of the broadcast radio wave is equal to or higher than a predetermined electric field strength, and the stereo When the signal detection unit detects a stereo signal included in the demodulated signal, the frequency analysis unit performs frequency analysis of the demodulated signal.

  The invention according to claim 4 of the present application is the music recording / reproducing apparatus according to any one of claims 1 to 3, wherein the music recording / reproducing apparatus includes a current position detecting unit, a road between nodes, A navigation system that includes a map storage unit that stores road data expressed by a link to be connected, and a navigation control unit that performs a route search based on the road data, and that provides route guidance based on a guidance route searched by the navigation control unit. It has a function.

  In the invention according to claim 1, when it is determined by the electric field intensity determination unit that the reception intensity of the broadcast radio wave is equal to or higher than a predetermined electric field intensity, the frequency analysis unit performs frequency analysis of the demodulated signal, It is determined whether or not the frequency is music content. When the frequency analysis unit determines that the frequency is music content, the control unit extracts the music content and records it in the recording unit.

  According to such a configuration, music content can be easily extracted from a radio broadcast or a television broadcast, and if it is estimated that there is an influence of noise, the music content is not discriminated. Can be performed with appropriate reliability.

  In the invention according to claim 2, when the stereo signal included in the demodulated signal is detected by the stereo signal detecting unit, the frequency analyzing unit analyzes the frequency of the demodulated signal, and the frequency is music content. When the frequency analysis unit determines that the frequency is music content, the control unit extracts the music content and records it in the recording unit.

  According to such a configuration, music content can be easily extracted from a radio broadcast or a television broadcast, and if the stereo signal cannot be detected, the music content is not discriminated. Will be able to do in degrees.

  In the invention according to claim 3, in the invention according to claim 1, the electric field strength determination unit determines that the reception strength of the broadcast radio wave is equal to or higher than a predetermined electric field strength, and the stereo signal detection unit performs the demodulation. When the stereo signal included in the signal is detected, the frequency analysis unit performs frequency analysis of the demodulated signal.

  According to such a configuration, music content can be easily extracted from a radio broadcast or a television broadcast, and if a stereo signal cannot be detected, the music content is not determined and there is an influence of noise. When estimated, music content is not discriminated, so that music content can be extracted with appropriate reliability.

  According to a fourth aspect of the present invention, in the music recording / reproducing apparatus according to any one of the first to third aspects, the music recording / reproducing apparatus includes a current position detecting unit and a link connecting the road between the nodes. A map storage unit that stores the road data expressed in the above, and a navigation control unit that performs a route search based on the road data, and has a navigation function that provides route guidance based on the guidance route searched by the navigation control unit. .

  According to such a configuration, in a music recording / reproducing apparatus having a navigation function, music content can be easily extracted from radio broadcasting or television broadcasting, and music content can be extracted with appropriate reliability. It becomes like this.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiments described below exemplify a music recording / reproducing apparatus for embodying the technical idea of the present invention, and are not intended to specify the present invention as this music recording / reproducing apparatus. The present invention is equally applicable to the music recording / reproducing apparatus of other embodiments included in the scope of claims. In the following embodiments, the present invention will be described in detail by taking as an example the case where the music recording / reproducing apparatus is a composite apparatus having a navigation function.

  FIG. 1 is a block diagram showing a detailed configuration of a music recording / reproducing apparatus having a navigation function according to Embodiment 1 of the present invention.

  Hereinafter, the music recording / reproducing apparatus will be described as the navigation apparatus 1.

  The navigation device 1 may be of a type that is not only used for in-vehicle use by being placed on a dashboard of a vehicle such as an automobile but can be removed from the vehicle and carried by the user. The navigation apparatus 1 is a navigation apparatus having a radio broadcast receiving function compatible with AM broadcasting and FM broadcasting.

  Note that the music content described in this embodiment indicates a music broadcast (program) or a music portion included in a music broadcast (in a program).

  The control means 10 is constituted by a processor including a CPU, a ROM and a RAM 12 (not shown), and controls the operation of each part of the navigation device 1 according to a control program recorded in the ROM.

  Further, the control means 10 controls to temporarily store the broadcast received by the radio broadcast receiving unit 11 described below in the RAM 12 and records (records) the broadcast temporarily stored in the RAM 12 in the hard disk unit 18 as a storage unit. Take control.

  The radio broadcast receiving unit 11 receives a broadcast from a broadcast station via the antenna 19 and obtains a demodulated signal. For this reason, although not shown, the radio broadcast receiving unit 11 is configured to include a demodulating unit such as a front end unit, an intermediate frequency amplifying unit, and an FM demodulating unit in the same manner as a general broadcast receiving unit.

  The operation unit 13 includes various keys, switches, and the like, and performs radio broadcast reception and navigation function execution instructions in the navigation device 1.

  The operation unit 13 may be input by touching an icon or the like displayed on the screen by providing a touch panel function in the display unit 14 described later.

  The display means 14 displays a map image and a guide route on the map image so as to be distinguishable from other roads, and is constituted by, for example, a liquid crystal display.

  The map storage unit 15 includes road node data (node data) and road link data (link data) that use nodes such as intersections and branch points of roads as nodes and links between the nodes as links. Store the data.

  The current position detection unit 16 is composed of, for example, a GPS receiver and receives radio waves including time information from a plurality of GPS satellites orbiting the earth, and calculates current position information based on the received radio waves. It is.

  The navigation control unit 17 controls navigation functions such as route search and route guidance, and is stored in the map storage unit 15 when a departure place or destination is designated by the user via the operation unit 13. By referring to the road data, the optimum route from the departure point to the destination is searched, and guide route data is created.

The electric field strength determination unit 20 detects the reception strength of broadcast radio waves received by the radio broadcast reception unit 11 and determines whether or not the reception level is equal to or higher than a predetermined electric field strength. (Hereafter abbreviated as broadcast reception strength or broadcast electric field strength)
When the field intensity determination unit 20 determines that the broadcast reception intensity is equal to or higher than a predetermined reception level, the frequency analysis unit 21 receives the radio broadcast reception unit 11 and receives a front end unit (not shown), an intermediate frequency amplification unit, Analyzing the frequency of a demodulated signal demodulated by a demodulator such as an FM demodulator (hereinafter referred to as a demodulated signal obtained by the radio broadcast receiver 11) to determine music content, As a result of the frequency analysis, if it is determined that the content is music content, the music content is extracted by the control means 10 and temporarily stored in the RAM 12. The music content data stored in the RAM 12 is compressed as necessary and recorded (recorded) in the hard disk unit 18 serving as a storage unit.

  When the music content is extracted by analyzing the frequency of the demodulated signal obtained by the radio broadcast receiving unit 11, if the electric field strength of the broadcast radio wave of the received broadcast is low, the music content cannot be determined only by the frequency analysis. That is, when the broadcast reception state deteriorates, the noise component tends to increase, and there is a problem that the noise component is erroneously determined as music content.

  Therefore, in the present application, it is assumed that the music content is determined by frequency analysis only when the reception level of the broadcast being received, for example, the received electric field strength of the broadcast is equal to or higher than a predetermined level.

  At this time, in the case of FM broadcasting, the music information such as the music title, performance artist, broadcasting date and time, broadcasting time, etc. obtained from the FM multiplex broadcasting text information and the like are associated with the music content data to be recorded (recorded) on the hard disk unit 18. You can create a song list and use it during playback. The association can be performed using broadcast time information such as program information.

  Various methods can be adopted as a frequency analysis method in the frequency analysis unit 21. For example, a threshold value for discriminating between a conversation part and a music part is determined in advance as a determination frequency level, and it is determined whether the frequency level of the demodulated signal obtained by the radio broadcast receiving unit 11 is larger or smaller than the determination frequency level. Thus, the music portion can be extracted.

  Further, the frequency analysis unit 21 stores frequency characteristic patterns for various music genres such as classic, pops, and rock, and compares the frequency patterns of the demodulated signals obtained by the radio broadcast receiving unit 11. It can also be configured to extract music parts. Further, the music portion may be extracted by analyzing the harmonic region or taking into account the power fluctuation of the received broadcast radio wave.

  According to such a configuration, music content can be easily extracted from the received radio broadcast or television broadcast, and when it is estimated that there is an influence of noise, the music content is not determined. Music content can be extracted with appropriate reliability.

  Next, the procedure of the recording operation of the music part in the music recording / reproducing apparatus 1 according to the first embodiment of the present invention described above will be described.

  FIG. 2 is a flowchart showing a recording process procedure of music content in the music recording / reproducing apparatus 1 shown in FIG.

  2 is described based on the control operation of the control means 10 in the navigation device 1.

  When it is intended to record the music content by receiving the broadcast, in step S101, when the broadcast reception / recording mode is set by the user and a desired broadcast song or program is designated, in step S102, the radio broadcast receiving unit is set. 11 starts receiving the broadcast designated in step S101. When the radio broadcast receiving unit 11 starts receiving the broadcast, the electric field strength determining unit 20 detects the electric field strength of the broadcast received by the radio broadcast receiving unit 11 in step S103.

  Then, in the process of step S104, it is determined whether or not the reception intensity of the broadcast received by the radio broadcast receiving unit 11 is a reception level equal to or higher than a predetermined electric field strength. Without recording the broadcast, the process proceeds to step 108 to determine whether or not the recording instruction is finished. If the recording is not finished, the process returns to the broadcast reception in step S102.

  In the determination process of step S104, if it is determined that the reception intensity of the broadcast received by the radio broadcast receiving unit 11 is a reception level equal to or higher than the predetermined electric field intensity, the process proceeds to step S105, and the frequency analysis unit 21 receives the radio broadcast. The frequency analysis of the demodulated signal obtained by the unit 11 is performed. The frequency analysis of step S105 is performed, and it is determined in step S106 whether the frequency of the demodulated signal is music content.

  As a result of the frequency analysis, if it is identified as music content (there is a music part), the process proceeds to step S107, and the music content data is temporarily stored in the RAM 12. When the music content has been extracted, the music content data stored in the RAM 12 is compressed as necessary and recorded (recorded) in the hard disk unit 18 serving as a storage unit.

  If it is determined in step S106 that the content is not music content, the broadcast content is not recorded, and the process proceeds to step 108 to determine whether or not the recording instruction is completed. Return to.

  If the recording process is not finished in step S108, the process returns to the broadcast reception in step S102. If it is determined that the recording is finished, the music recording / reproducing apparatus 1 ends the recording process.

  In the music recording / reproducing apparatus 1 according to the first embodiment described above, it is determined whether or not the received electric field strength of the broadcast received by the radio broadcast receiving unit 11 is equal to or higher than a predetermined level. Instead, determination based on detection of the presence or absence of a stereo signal can be used.

  FIG. 3 is a block diagram showing a configuration of the music recording / reproducing apparatus 1 according to the second embodiment of the present invention using a stereo signal reception level.

  The configuration of the music recording / reproducing apparatus 1 in FIG. 3 is basically the same as that of the music recording / reproducing apparatus 1 according to the first embodiment, and the same components as those in FIG. 1 are denoted by the same reference numerals. The music recording device 1 of FIG. 3 is different in that a stereo signal detection unit 30 is provided instead of the electric field strength determination unit 20 of the music recording device 1 of FIG.

  In general, when music content is received by radio broadcasting, it is often stereo broadcasting, and the music recording / reproducing apparatus has a function of detecting a stereo signal.

  The stereo signal detector 30 detects the presence or absence of a stereo signal included in the demodulated signal obtained by the radio broadcast receiver 11, and is used for broadcasting music content. By determining the presence or absence of stereo signal detection, the same processing as in the first embodiment can be performed.

  That is, when the radio broadcast receiving unit 11 receives a broadcast and records a music content, the stereo signal detecting unit 30 extracts a stereo signal from the demodulated signal obtained by the radio broadcast receiving unit 11 and determines the presence or absence. At this time, it is also possible to detect the reception intensity of the stereo signal and determine whether or not the reception level is equal to or higher than the predetermined reception intensity, and also serve as reception field strength determination.

  When a stereo signal is detected from the demodulated signal, there is a high possibility that music content is included. Therefore, when the frequency analysis unit 21 performs frequency analysis of the demodulated signal and identifies it as music content, the music content is stored in the RAM 12. Temporarily stored. The music content data stored in the RAM 12 is compressed as necessary and recorded (recorded) in the hard disk unit 18 serving as a storage unit.

  In addition, in consideration of the determination of the received electric field strength in the first embodiment, the received electric field strength of the broadcast received by the radio broadcast receiving unit 11 is equal to or higher than a predetermined level, and further, the stereo from the demodulated signal obtained by the radio broadcast receiving unit 11 When a signal is detected, frequency analysis by the frequency analysis unit 21 may be performed.

  As described above in detail, according to the music recording / reproducing apparatus 1 according to the present invention, music content can be easily extracted from the received radio broadcast or television broadcast, and it is estimated that there is an influence of noise. In this case, the music content is not discriminated, so that the music content can be extracted with appropriate reliability.

It is a block diagram which shows the structure of the music recording / reproducing apparatus concerning Example 1 of this invention. It is a flowchart which shows the process sequence in the music recording / reproducing apparatus concerning Example 1 of this invention. It is a block diagram which shows the structure of the music recording / reproducing apparatus concerning Example 2 of this invention.

Explanation of symbols

1: Music recording / playback device (navigation device)
10: Control means 11: Radio broadcast receiver (broadcast receiver)
12: RAM
13: Operation unit 14: Display unit 15: Map storage unit 16: Current position detection unit 17: Navigation control unit 18: Recording unit (hard disk unit)
19: Antenna 20: Electric field strength determination unit 21: Frequency analysis unit 30: Stereo signal detection unit

Claims (2)

In a music recording / reproducing apparatus including a broadcast receiving unit that receives a broadcast, a recording unit that records the content of the received broadcast, and a control unit,
The music recording / reproducing apparatus includes: an electric field strength determination unit that determines whether or not a reception intensity of a broadcast radio wave received by the broadcast reception unit is equal to or higher than a predetermined electric field strength; and a demodulation obtained by the broadcast reception unit. A stereo signal detector for detecting the presence or absence of a stereo signal included in the signal, a frequency analyzer for analyzing the frequency of the demodulated signal obtained by the broadcast receiver and determining whether the frequency is music content, With
When the electric field strength determining unit determines that the received intensity of the broadcast radio wave is equal to or higher than a predetermined electric field strength, and the stereo signal detecting unit detects a stereo signal included in the demodulated signal, the frequency analyzing unit The frequency analysis of the demodulated signal is performed to determine whether or not the frequency is music content, and the control unit determines that the frequency is music content when the frequency analysis unit determines that the frequency is music content. In addition, the frequency characteristic pattern for each music genre stored in the frequency analysis unit is compared with the frequency pattern of the demodulated signal obtained by the broadcast receiving unit to extract the music portion and the recording A music recording / reproducing apparatus for recording in a recording section. The music recording / reproducing apparatus includes a current position detection unit, a map storage unit that stores road data that expresses a road by a link that connects nodes to each other, a navigation control unit that performs a route search based on the road data, The music recording / reproducing apparatus having a navigation function according to claim 1, further comprising: a navigation function for guiding a route based on a guidance route searched by the navigation control unit.

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