JP2010039122A - Recording and playback device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve quality in playback of a recorded musical piece content. <P>SOLUTION: A car audio device includes: a tuner section for receiving a broadcast signal; a musical piece content extracting section 21 for extracting a musical piece period from the received broadcast signal; a hard disk drive (HDD) 10 for storing the broadcast signal of the extracted musical piece period; and a playback section 25 for playing back the broadcast signal of the stored musical piece period. The playback section 25 includes a sound volume control section 27 for controlling a sound volume when the musical piece period starts or ends. Thereby, quality in playback of the recorded musical piece period is improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a recording / reproducing apparatus, and more particularly to a recording / reproducing apparatus for recording and reproducing music content included in a broadcast signal.

  In recent years, a technique for automatically discriminating music from audio broadcast in a radio broadcast program is known (for example, Patent Document 1).

However, the music broadcast on a radio broadcast program often has a disc jockey talk at the beginning and end, which is annoying when playing the recorded music.
JP 2008-27573 A

  The present invention has been made to solve the above-described problems, and one of the objects of the present invention is to provide a recording / reproducing apparatus with improved quality in reproducing recorded music contents.

  In order to achieve the above-described object, according to one aspect of the present invention, a recording / reproducing apparatus includes: a receiving unit that receives a broadcast signal; an extracting unit that extracts a song section from the received broadcast signal; and an extracted song Storage means for storing the broadcast signal of the section and playback means for playing back the stored music section, and the playback means includes volume control means for controlling the volume at the start or end of the music section.

  According to this aspect, when reproducing the broadcast signal of the stored music section, the volume is controlled at the start or end of the music section. For this reason, the unnecessary sound recorded at the start or end of the music section can be reduced and reproduced. As a result, it is possible to provide a recording / playback apparatus that improves the quality of playback of recorded music sections.

  Preferably, the volume control means performs a fade-in process for gradually increasing the volume from the start of the music section and a fade-out process for gradually decreasing the volume before the end of the music section.

  According to this aspect, since the volume at the start or end of the music section changes gradually, it is possible to prevent the volume from changing suddenly.

  Preferably, it further includes setting means for setting a fade-in process time and a fade-out process time corresponding to the stored music section.

  If this aspect is followed, the time which controls a sound volume according to a music area can be set.

  Preferably, in the case of stereo music including two channels in the music section, output means for adding the signals of each of the two channels at the start or end of the music section and adding the signal obtained by inverting the phase of the signal of the other channel. Further prepare.

  According to this aspect, at the start or end of the music section, the signals of the two channels are output by adding a signal obtained by inverting the phase of the signal of the other channel. For this reason, since the same signal included in the two channels is not reproduced, unnecessary sounds included in both the two channels can be prevented from being reproduced. As a result, it is possible to provide a recording / playback apparatus that improves the quality of playback of recorded music sections.

  According to another aspect of the present invention, the recording / reproducing apparatus stores a receiving means for receiving a broadcast signal, an extracting means for extracting a music section from the received broadcast signal, and a broadcast signal of the extracted music section. Storage means and playback means for playing back the broadcast signal of the stored music section. When the broadcast signal of the music section is stereo music including two channels, the playback means is 2 at the start or end of the music section. It includes conversion means for adding the signals of the respective channels and adding the signal obtained by inverting the phase of the signal of the other channel.

  According to this aspect, the signal of each of the two channels is added at the start or end of the music section and the signal obtained by inverting the phase of the signal of the other channel is output. For this reason, since the same signal included in the two channels is not reproduced, unnecessary sounds included in both the two channels can be prevented from being reproduced. As a result, it is possible to provide a recording / playback apparatus that improves the quality of playback of recorded music sections.

  Preferably, an activation setting means for setting a time for activating the conversion means corresponding to the stored music section is further provided.

  According to this aspect, it is possible to set a time during which unnecessary sounds included in both channels are not reproduced according to the music section.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a diagram illustrating an example of a basic configuration of a car stereo device according to the present embodiment. Referring to FIG. 1, a car stereo device is a central processing unit (CPU) 7 that controls the entire car stereo device, a memory 8, a tuner unit 1 that receives broadcast radio waves, and converts an analog signal into a digital signal. An A / D converter 2 that performs digital signal processing, a digital signal processor (DSP) 3 that compresses digital audio signals, a D / A converter 4 that converts digital signals into analog signals, and a recording medium 9.

  The tuner unit 1 is controlled by the CPU 7, receives a broadcast wave such as a television broadcast or a radio broadcast, receives a radio wave of a broadcast station selected from the received broadcast wave, and broadcasts the received broadcast wave as a broadcast signal. Demodulate. The tuner unit 1 outputs the demodulated broadcast signal to the A / D converter 2. Note that, here, a case where a broadcast radio wave is received will be described as an example, but a broadcast signal broadcast by wire may be received.

  The A / D converter 2 converts the broadcast signal input by the tuner unit 1 into a digital broadcast signal, and outputs the broadcast signal to the DSP 3.

  The DSP 3 is controlled by the CPU 7 and compresses the digital broadcast signal input from the A / D converter 2 according to an instruction from the CPU 7 to generate encoded data. The DSP 3 stores the generated encoded data in the recording medium 9. Further, the DSP 3 is controlled by the CPU 7 and reads the encoded data stored in the recording medium 9 in accordance with an instruction from the CPU 7, decodes the read encoded data, and generates audio data. The DSP 3 outputs the generated audio data to the D / A converter 4.

  The D / A converter 4 converts the digital audio data input from the DSP 3 into an analog audio signal. Then, the audio signal converted into analog is output to the outside. The audio signal output from the D / A converter 4 is a stereo signal.

  The memory 8 includes a ROM (Read Only Memory) for storing a program executed by the CPU 7 and a RAM (Random Access Memory) used as a work area of the CPU 7.

  The recording medium 9 records data. Recording media include flexible disks, cassette tapes, optical disks (CD-ROM (Compact Disc-Read Only Memory) / MO (Magnetic Optical Disc) / MD (Mini Disc) / DVD (Digital Versatile Disc)), IC cards, optical cards. A semiconductor memory such as a card, a mask ROM, an EPROM (Erasable Programmable ROM), and an EEPROM (Electronically EPROM).

  FIG. 2 is a functional block diagram illustrating an example of an outline of functions of the DSP and the CPU. Referring to FIG. 2, the DSP 3 stores a music content extraction unit 21 that extracts a music section (music content) from a broadcast signal, a recording unit 23 that stores the extracted music content in the recording medium 9, and a recording medium 9. And a playback unit 25 that plays back the stored music content according to the setting information. The CPU 7 includes a setting unit 29 that stores the setting information in the recording medium 9.

  The music content extraction unit 21 extracts a section including music from the broadcast signal input from the A / D converter 2. Among the broadcast signals, a section including music is called a music section, and a broadcast signal in the music section is called music content. The technique of extracting the music section from the broadcast signal is, for example, detecting a time point when the amount of change in the audio signal level is a predetermined value or more as a cut point, and calculating a feature amount in the frequency domain of the audio signal only near the cut point A technique for determining the attribute of the cut point based on the calculated frequency feature amount and detecting the start point and the end point of the music section based on the interval between the attribute and the sampling point can be used. The music content extraction unit 21 outputs the broadcast signal (music content) of the extracted music section to the recording unit 23.

  The recording unit 23 stores the encoded data (music content) obtained by compressing the music content input from the music content extracting unit 21 in the recording medium 9. Thereby, the music content 31 compression-encoded is stored in the recording medium 9.

  The setting unit 29 receives setting information input by the user, and stores the received setting information in the recording medium 9. Thereby, the setting information 33 is stored in the recording medium 9. The setting information is stored for each music content stored in the recording medium 9.

  FIG. 3 is a diagram illustrating an example of setting information. Referring to FIG. 3, setting information 33 includes items of a song name, a singer name, a fade-in time, a fade-out time, a start vocal cancel time, and an end vocal cancel time for each music content. The fade-in time is set to a time for executing a fade-in process described later from the start of the music content when the music content is reproduced. The fade-out time is a time before the music content is finished when the music content is reproduced, and a time for executing the fade-out process is set. The start time vocal cancel time is set to a time for performing a vocal cancel process described later from the start of the music content when the music content is reproduced. The vocal cancellation time at the end is a time before the music content is ended when the music content is played back, and a time for executing the vocal cancellation process is set.

  Returning to FIG. 2, the playback unit 25 plays back the music content 31 stored in the recording medium 9 according to the setting information 33 stored in the recording medium 9. Specifically, the music content 31 stored in the recording medium 9 is read, the music content 31 is decrypted, and audio data of the music content is generated. The DSP 3 outputs the generated audio data to the D / A converter 4.

  In addition, the playback unit 25 includes a volume control unit 27 and a conversion unit 28. The volume control unit 27 reads the setting information 33 corresponding to the music content 31 from the recording medium 9 and acquires the fade-in time and the fade-out time set in the fade-in time item and the fade-out time item of the setting information 33. . Then, it is converted into audio data that gradually increases the volume from the start of the music content until the fade-in time elapses, and from the time before the end of the music content until the end of the fade-in time Convert to audio data that gradually decreases the volume. As a result, the music content output from the car audio device gradually increases in volume from the start until the fade-in time elapses, and ends from the time before the end of the music content by the fade-in time. Until then, the volume gradually decreases. For this reason, even when a disc jockey comment is included at the beginning and the end of the music content, the volume of the disc jockey is lowered, so that the voice of the disc jockey comment can be reduced.

  The conversion unit 28 reads the setting information 33 corresponding to the music content 31 from the recording medium 9, and the start vocal cancellation time set in the start vocal cancellation time item and the end vocal cancellation time item of the setting information 33. And get the vocal cancellation time at the end. Then, each of the right channel signal and the left channel signal included in the audio data of the music content is added to an inverted signal obtained by inverting the phase of the other channel signal during the start vocal cancellation time and the end vocal cancellation time. Convert. Specifically, a right inverted signal obtained by inverting the right channel signal is generated, and a left inverted signal obtained by inverting the left channel signal is generated. Then, the left channel signal at the start vocal cancellation time and the end vocal cancellation time is converted into a signal obtained by adding the right inverted signal generated thereto, and the right channel signal is converted into a signal obtained by adding the left inverted signal generated thereto. Convert.

  Since the sound of the disc jockey is included in each of the right channel signal and the left channel signal as the same signal, it is deleted when a signal in which the phase of the other channel is inverted is added. For this reason, even when the sound of the disc jockey is included at the start or end of the music content, the audio of the disc jockey can be erased.

  Here, an example is shown in which the DSP 3 has the above-described functions, but the CPU 7 may have some or all of the above-described functions.

  FIG. 4 is a flowchart illustrating an example of the flow of the recording process. The recording process is a process executed by the CPU 7 and the DSP 3 when the CPU 7 and the DSP 3 execute the recording / reproducing program. Referring to FIG. 4, CPU 7 activates tuner unit 1 (step S01). At this time, broadcast radio waves of the broadcast station selected by the user are received. And DSP3 starts extraction of a music content (step S02).

  In the next step S03, the DSP 3 determines whether or not the music content start point has been detected. The process waits until the start point of the music content is detected (NO in step S03). If the start point of the music content is detected (YES in step S03), the process proceeds to step S04. In step S04, encoding is started. Then, it is determined whether or not the end point of the music content has been detected (step S05). The process waits until the end point of the music content is detected (NO in step S05). If the end point of the music content is detected (YES in step S05), the process proceeds to step S06. For this reason, the audio signal from the start point to the end point of the music content is encoded, and encoded data of the entire music content is generated. In the next step S06, the encoding is finished, and the process proceeds to step S07. In step S07, the encoded music content data is stored in the recording medium 9. As a result, the music content 31 is stored in the recording medium 9.

  FIG. 5 is a flowchart showing an example of the flow of reproduction processing. The reproduction process is a process executed by the DSP 3 when the DSP 3 executes a recording / reproduction program. Referring to FIG. 5, DSP 3 reads setting information 33 corresponding to the music content to be reproduced from recording medium 9 (step S11). The music content to be reproduced is specified based on the operation by the user.

  In step S12, decoding is started. The encoded data of the music content to be reproduced is decoded. Then, it is determined whether or not the elapsed time since the start of reproduction (hereinafter referred to as “reproduction time”) is included in the fade-in time set in the fade-in time item of the setting information 33 (step S13). . If the reproduction time is included in the fade-in time, the process proceeds to step S14. If not, step S14 is skipped and the process proceeds to step S15. In step S14, a fade-in process is executed.

  In the next step S15, it is determined whether or not the reproduction time is included in the start vocal cancel time set in the start vocal cancel time item of the setting information 33. If the reproduction time is included in the start vocal cancellation time, the process proceeds to step S16. If not, step S16 is skipped and the process proceeds to step S17.

  In step S16, vocal cancel processing is executed. Specifically, for each of the right channel signal and the left channel signal, the signal of the other channel is converted into a signal obtained by adding an inverted signal obtained by inverting the phase.

  In the next step S17, it is determined whether or not the reproduction time is included in the fade-out time set in the fade-out time item of the setting information 33. If the reproduction time is included in the fade-out time, the process proceeds to step S18. If not, step S18 is skipped and the process proceeds to step S19. In step S18, a fade-out process is executed.

  In the next step S19, it is determined whether or not the reproduction time is included in the end vocal cancellation time set in the end vocal cancellation time item of the setting information 33. If the reproduction time is included in the vocal cancellation time at the end, the process proceeds to step S20. If not, step S20 is skipped and the process proceeds to step S21. In step S20, a vocal cancellation process is executed as in step S16.

  In step S21, it is determined whether a reproduction end instruction has been accepted. If an instruction to end reproduction is input by the user, the process proceeds to step S22; otherwise, the process returns to step S13. In step S22, decoding is terminated and the process is terminated.

  As described above, when reproducing the stored music content, the car stereo device according to the present embodiment reproduces the sound volume at the start of the music content by performing the fade-in process or the fade-out process at the end. For this reason, unnecessary sounds such as disc jockey comments recorded at the start or end of the music content can be reduced and reproduced. Further, since the volume is gradually changed, it is possible to prevent the volume from changing suddenly.

  Furthermore, since the fade-in process time and the fade-out process time can be set for each music content, the fade-in process or the fade-out process can be performed according to the music content. For example, when the comment of the diced jockey is not recorded, the fade-in process or the fade-out process can be prevented from being performed.

  When the music content is a stereo music including two channels, the signal of each of the two channels is converted into a signal obtained by adding an inverted signal obtained by inverting the phase of the signal of the other channel at the start or end of the music content. Voices such as disc jockey comments are often included as the same signal in each of the two channels. For this reason, it is possible not to reproduce the sound such as a disc jockey comment.

  Furthermore, since the time for converting the signals of the two channels can be set for each music content, it can be converted according to the music content. For example, when a comment of Dick Jockey is not recorded, it is possible not to convert it.

  In the above-described embodiment, the car stereo device has been described as an example of the recording / reproducing device. However, the recording / reproducing method or the recording / reproducing method for executing the processing shown in FIG. It goes without saying that the invention can be understood as a recording / reproducing program to be executed by a computer.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows an example of the basic composition of the car stereo apparatus in this Embodiment. It is a functional block diagram which shows an example of the outline | summary of the function of DSP and CPU. It is a figure which shows an example of setting information. It is a flowchart which shows an example of the flow of a recording process. It is a flowchart which shows an example of the flow of reproduction | regeneration processing.

Explanation of symbols

1 tuner unit, 2 converter, 3 DSP, 4 D / A converter, 7 CPU, 8 memory, 9 recording medium, 21 music content extraction unit, 23 recording unit, 25 playback unit, 27 volume control unit, 28 conversion unit , 29 setting section, 31 music content, 33 setting information.

Claims (6)

Receiving means for receiving a broadcast signal;
Extracting means for extracting a music section from the received broadcast signal;
Storage means for storing the broadcast signal of the extracted music section;
Replay means for replaying the broadcast signal of the stored music section,
The recording / playback apparatus, wherein the playback means includes volume control means for controlling the volume at the start or end of the music section.   The recording / reproducing of storage according to claim 1, wherein the volume control means executes a fade-in process for gradually increasing the volume from the start of the music section and a fade-out process for gradually decreasing the volume before the end of the music section. apparatus.   The recording / reproducing apparatus according to claim 2, further comprising setting means for setting the fade-in process time and the fade-out process time corresponding to the stored music section.   In the case where the music section is a stereo music including two channels, output means for outputting the signals of the two channels at the start or end of the music section and adding the signal obtained by inverting the phase of the signal of the other channel, The recording / reproducing apparatus in any one of Claims 1-3 provided. Receiving means for receiving a broadcast signal;
Extracting means for extracting a music section from the received broadcast signal;
Storage means for storing the broadcast signal of the extracted music section;
Replay means for replaying the broadcast signal of the stored music section,
In the case where the broadcast signal of the stored music section is a stereo music including two channels, the playback means inverts the phase of the signal of each of the two channels at the start or end of the music section and the signal of the other channel. A recording / reproducing apparatus including output means for adding and outputting signals.   6. The recording / reproducing apparatus according to claim 4, further comprising activation setting means for setting a time for activating the output means corresponding to the stored broadcast signal of the music section.

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