JP2004342214A - Digital recording/reproducing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide digital recording and reproducing equipment capable of accurately, automatically adding the information between the pieces of music (music numbers) even if the background of an audio signal contains unnecessary noise components. <P>SOLUTION: The MD recording and reproducing equipment 1a comprises an SG data detection section 23 for extracting the level information A of a sound signal for each frequency component; a band control section 24 for performing band control processing to level information A, based on band control information W for obtaining level information A'; a level determination section 25 for performing matching determination with determination conditions X by comparing the level information A' with a determination level L; and a time determination section 26 for monitoring output time (t) of a condition matching signal B. In the MD recording and reproducing equipment 1a, the address information of the sound signal when the output time (t) exceeds a prescribed time T is recorded on an MD 12 as the information between the pieces of music. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital recording / reproducing apparatus for reading and writing audio signals on a digital recording medium such as an MD (mini disc).
[0002]
[Prior art]
2. Description of the Related Art In a digital recording / reproducing apparatus that reads and writes an audio signal on a digital recording medium such as an MD, when writing an audio signal to a digital recording medium, it is possible to record inter-song information (tune number) for music selection along with the audio signal. Required.
[0003]
For example, when digital recording from a digital sound source such as a CD or MD to an MD is performed, the inter-song information added to the master audio signal by the automatic inter-song information transfer function during recording (a so-called synchro mark function). The (tune number) is also copied directly to the UTOC [User Table Of Contents] area of the recording destination MD. Note that the UTOC area is a recording area in which various information (such as a song number and character information) relating to a recorded audio signal can be freely rewritten by the user.
[0004]
On the other hand, when digital recording from a digital sound source other than a CD or MD or an analog sound source to an MD is performed, a silent portion (a so-called auto track function) of a music signal serving as a master is provided by a function for automatically adding inter-song information at the time of recording. (For example, one second or more) is detected, and the inter-song information (song number) is automatically recorded in the UTOC area of the recording destination MD based on the detection result.
[0005]
Many conventional digital recording / reproducing apparatuses have a music division function (so-called divide function) for manually adding inter-song information to a recorded audio signal later. In order to add the inter-song information by the above-mentioned divide function, first, a recorded audio signal is reproduced to find a place to be divided into pieces, the reproduction operation is paused at the place, and then the divide processing is executed. If there is a portion to be continuously divided, the operation of reproducing the audio signal may be restarted and the above operation may be repeated. Note that the inter-song information (song number) generated by the above-described divide processing is collectively written to the UTOC area of the digital recording medium after all the divide processing is completed.
[0006]
Conventionally, the above-mentioned divide function by manual operation has been developed to play back recorded audio signals to detect silence, and automatically add inter-song information (song number) based on the detection result. A disc recording / reproducing apparatus having a function of performing the above-mentioned operation (a function combining the above-described auto track function and the divide function, hereinafter referred to as an auto divide function) is also disclosed and proposed (for example, see Patent Document 1).
[0007]
[Patent Document 1]
JP-A-10-208450 [0008]
[Problems to be solved by the invention]
Certainly, a digital recording / reproducing apparatus having the above-described auto track function and auto divide function is a case where digital recording is performed from a digital sound source other than a CD or MD or an analog sound source (or a case where digital recording is performed). Also, it is possible to automatically add the inter-song information (song number) by regarding the silent portion of the audio signal as the inter-song without bothering the user.
[0009]
However, in the silence detection processing of the conventional auto track function or auto divide function, all frequency components of the master audio signal (or the recorded audio signal) are uniformly targeted for silence detection. If an unnecessary noise component (noise, etc.) is included in the song, the inter-song portion that should be silence is not judged to be silence, and as a result, the automatic addition position of the inter-song information (song number) is incorrect. was there. Also, when microphone input is used as a sound source for a conference or the like, silence occurs irregularly regardless of the intention of the recorder, so even if the auto track function or the auto divide function described above is applied, the intention of the recorder It is rare that the inter-song information (song number) is automatically added to the place where it is performed.
[0010]
In addition, in the above-mentioned silence detection processing, if the judgment level used for the sound volume level judgment and the silence time judgment of the audio signal can be arbitrarily adjusted, the above problem can be alleviated to some extent (for example, see Patent Document 1). ). However, even if such a configuration is adopted, the above problem is fundamentally solved as long as all frequency components of the master audio signal (or recorded audio signal) are uniformly targeted for silence detection. Could not.
[0011]
The present invention has been made in view of the above-described problems, and has been made in consideration of the above-described problems. Even when an unnecessary noise component is included in the background of an audio signal, a digital signal that can automatically add inter-song information (song number) accurately can be provided. An object of the present invention is to provide a recording and reproducing device.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a digital recording / reproducing apparatus according to the present invention is a digital recording / reproducing apparatus for reading / writing an audio signal on / from a digital recording medium, and extracts level information of the audio signal for each frequency component. A level information detection unit, a band control unit that extracts a frequency band other than the frequency band specified for the level information decomposed for each frequency component by the level information detection unit, and a predetermined determination based on the level information obtained by the band control unit. A level determining unit that compares levels to determine whether or not a predetermined determination condition is satisfied; and a time determination unit that monitors a condition matching time in the level determination unit. The address information of the audio signal at the time when the time exceeds a predetermined time is recorded on the digital recording medium as the music interval information.
[0013]
With such a configuration, even when unnecessary noise components are included in the background of the audio signal, it is possible to automatically add the inter-music information (music number) accurately. This configuration can be said to be a suitable configuration when the frequency band of the noise component is known or can be estimated.
[0014]
Also, a digital recording / reproducing apparatus according to the present invention is a digital recording / reproducing apparatus for reading / writing an audio signal on / from a digital recording medium, wherein a level information detecting section for extracting level information of the audio signal for each frequency component; A band control unit that extracts only a designated frequency band for the level information decomposed for each frequency component by the level information detection unit, and compares the level information obtained by the band control unit with a predetermined determination level to determine a predetermined level. A level determining unit that determines whether or not the condition is satisfied, and a time determining unit that monitors a condition matching time in the level determining unit, wherein the condition matching time exceeds a predetermined time. The address information of the audio signal at the point in time is recorded on the digital recording medium as inter-music information.
[0015]
With such a configuration, even when unnecessary noise components are included in the background of the audio signal, it is possible to automatically add the inter-song information accurately. This configuration can be said to be a suitable configuration when the frequency band of the inter-song information reference signal intended as a level determination target is known or can be estimated.
[0016]
Also, a digital recording / reproducing apparatus according to the present invention is a digital recording / reproducing apparatus for reading / writing an audio signal on / from a digital recording medium, wherein a level information detecting section for extracting level information of the audio signal for each frequency component; A band control unit that performs weighting for each frequency component with respect to the level information decomposed for each frequency component by the level information detection unit; and a predetermined determination condition by comparing the level information obtained by the band control unit with a predetermined determination level. A level determining unit that determines whether or not the condition is satisfied, and a time determining unit that monitors a condition matching time in the level determining unit. The address information of the audio signal is recorded on the digital recording medium as inter-song information.
[0017]
With such a configuration, even when unnecessary noise components are included in the background of the audio signal, it is possible to automatically add the inter-music information (music number) accurately. According to this configuration, it is possible to perform a highly controllable adjustment in detecting a silent portion (or a reference signal) of an audio signal. Can be automatically added.
[0018]
A digital recording / reproducing apparatus according to the present invention is a digital recording / reproducing apparatus for reading / writing an audio signal on / from a digital recording medium, comprising: a level information detecting section for extracting level information of the audio signal for each frequency component; A determination level adjustment unit that generates a determination level weighted for each component; a level information decomposed for each frequency component by the level information detection unit; and a determination level generated by the determination level adjustment unit. A level determining unit that determines whether or not the condition is satisfied, and a time determining unit that monitors a condition matching time in the level determining unit, wherein the condition matching time exceeds a predetermined time. The configuration is such that the address information of the audio signal at the time is recorded on the digital recording medium as the inter-music information.
[0019]
With such a configuration, even when unnecessary noise components are included in the background of the audio signal, it is possible to automatically add the inter-music information (music number) accurately. According to this configuration, it is possible to perform a highly controllable adjustment in detecting a silent portion (or a reference signal) of an audio signal. Can be automatically added.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Here, as a digital recording / reproducing apparatus according to the present invention, a mini disc recording / reproducing apparatus will be described as an example.
[0021]
First, a detailed description will be given of a first embodiment of a minidisk recording / reproducing apparatus according to the present invention. FIG. 1 is a block diagram showing a first embodiment of a minidisk recording / playback apparatus according to the present invention.
[0022]
Digital audio data output from a digital audio signal source such as a compact disk reproducing device or a satellite broadcast receiving device is input to an input terminal 2 provided in the mini-disc recording / reproducing device 1a shown in FIG. Is done. The optical signal input to the input terminal 2 is converted into an electric signal by the photoelectric element 3 and then input to a digital PLL [Phase-Locked-Loop] circuit 4.
[0023]
The digital PLL circuit 4 extracts a clock from the input digital audio data and reproduces multi-bit data corresponding to the sampling frequency and the number of quantization bits. This multi-bit data is sampled at a different sampling rate (compact disc; 44.1 [kHz], digital audio tape recorder; 48 [kHz], satellite broadcasting (A mode); 32 [kHz], etc.) for each signal source. Digital signal. Therefore, the multi-bit data output from the digital PLL circuit 4 is converted by the frequency conversion circuit 5 into a sampling rate of 44.1 [kHz] corresponding to the mini disc standard.
[0024]
The audio compression unit 6a of the ATRAC-DSP [Digital Signal Processor] 6 performs compression encoding of digital audio data input by the ATRAC [Adaptive Transform Acoustic Coding] method, and converts the encoded digital audio data into a shock-proof memory controller. 7 to the signal processing circuit 8.
[0025]
The shockproof memory 9 controlled by the shockproof memory controller 7 absorbs the difference between the transfer speed of the digital sound data output from the sound compression unit 6a and the transfer speed of the digital sound data input to the signal processing circuit 8. In addition, the interruption of the reproduction signal due to disturbance such as vibration during reproduction is interpolated to protect digital audio data.
[0026]
The signal processing circuit 8 has a function as an encoder and a decoder. The signal processing circuit 8 encodes the input digital audio data into a serial magnetic field modulation signal and provides the serial magnetic field modulation signal to the head drive circuit 10. The head drive circuit 10 moves the recording head 11 to a predetermined recording position on the mini disk 12 and generates a magnetic field corresponding to the magnetic field modulation signal. At this time, a predetermined recording position on the mini disk 12 is irradiated with laser light from the optical pickup 13, whereby a magnetization pattern corresponding to the magnetic field is formed on the mini disk 12.
[0027]
On the other hand, the optical pickup 13 reproduces a serial signal corresponding to the magnetization pattern from the mini disc 12. The reproduced serial signal is amplified by a high-frequency amplifier 14 (hereinafter, referred to as an RF amplifier 14), and then decoded by a signal processing circuit 8 into digital audio data. The decoded digital audio data is sent to the audio expansion unit 6b of the ATRAC-DSP 6, after the influence of disturbance is removed by the shock proof memory controller 7 and the shock proof memory 9.
[0028]
The audio decompression unit 6b performs an inverse conversion process of the compression encoding based on the ATRAC method, and demodulates full-bit digital audio data. The demodulated digital audio data is converted into analog audio data by a digital / analog conversion circuit 15 (hereinafter, referred to as a D / A conversion circuit 15), and output from an output terminal 16 to an external device (not shown, such as a speaker).
[0029]
Note that the serial signal amplified by the RF amplifier 14 is also input to the servo circuit 17. The servo circuit 17 sends a control signal to a driver circuit 18 according to the reproduced serial signal, and performs feedback control of the rotation speed of the spindle motor 19 via the driver circuit 18. By such feedback control, the mini-disc 12 can be rotated at a constant linear velocity.
[0030]
The servo circuit 17 also performs feedback control on the rotation speed of the feed motor 20 via the driver circuit 18. By such feedback control, displacement control of the optical pickup 13 in the radial direction of the mini-disc 12, that is, tracking control can be performed. Further, the servo circuit 17 controls the focusing of the optical pickup 13 via the driver circuit 18.
[0031]
Power is supplied from the power supply circuit (not shown) to the signal processing circuit 8, the optical pickup 13, the RF amplifier 14, the servo circuit 17, the driver circuit 18, and the like. All operations are centrally managed by the system control microcomputer 21. The system control microcomputer 21 is connected to an input device 22 for performing various operations (playback, recording, division, synthesis, erasing, etc.) on the mini-disc 12, a song name input, a song selection operation, a sound quality adjustment operation, and the like. Have been.
[0032]
The mini-disc recording / playback apparatus 1a according to the present embodiment includes, as means for realizing an automatic addition function (auto-track function or auto-divide function) of inter-song information (song number) according to the present invention, In addition to 22, an SG data detection unit 23, a band control unit 24, a level determination unit 25, and a time determination unit 26 are provided. Hereinafter, the process of automatically adding the inter-song information (song number) by each of the components 23 to 26 will be described.
[0033]
The SG data detection unit 23 outputs the digital audio data output from the audio compression unit 6a during recording and the digital audio data read from the shock proof memory 9 during reproduction (both data are in a compressed state, and are hereinafter referred to as SG data). ), The level information of the recorded audio signal is extracted for each frequency component and sent to the band control unit 24. When the digital recording medium is the mini-disc 12, the SG data holds audio information during a certain minute time 11.6 [ms] in a form divided into 512 frequency components (see FIG. 2). reference). Therefore, the SG data detection unit 23 extracts the level information of the recorded audio signal for each frequency component only by reading the format of the SG data. In addition, by performing automatic addition processing of inter-song information (song number) using the SG data in the compressed state, the processing can be performed at high speed.
[0034]
The band control unit 24 is a characteristic part of the present embodiment. The band control unit W converts the level information A of the audio signal decomposed for each frequency component by the SG data detection unit 23 into the band control information W set by the input device 22. Based on the band control processing, the level information A ′ after the processing is sent to the level determination unit 25 in the next stage. The above-described band control processing will be described later in detail.
[0035]
The level determination unit 25 compares the level information A ′ obtained by the band control unit 24 with the determination level L set by the input device 22, and if the comparison result matches the determination condition X, The match signal B is sent to the time determination unit 26 at the next stage. Note that the determination condition X can be arbitrarily set by the input device 22. In this embodiment, for the sake of convenience, the determination condition X is determined to satisfy {A ′ <L} when X = 0 (silence detection mode), and to satisfy {A ′> L} when X = 1 ( Reference sound detection mode).
[0036]
The time determination unit 26 compares the output duration t of the condition matching signal B with the detection time T set by the input device 22, and if the output duration t is longer than the detection time T, the system control microcomputer 21 Then, the address information at that time is stored in the shock proof memory 9 as inter-song information (song number). The address information is written into the UTOC area of the mini-disc 12 after the end of recording or reproduction of the mini-disc 12, and a series of music number automatic addition processing is completed.
[0037]
Next, the band control process performed by the above-described band control unit 24 will be described in detail by exemplifying three variations shown in FIGS.
[0038]
First, the first band control process will be described with reference to FIG. FIG. 3A shows level information A of an audio signal including a noise component exceeding the determination level L. If such level information A is directly input to the level determination unit 25 (silence part detection mode; determination condition X = 0), ｛A <despite that other frequency components are below the determination level L Since L｝ is not satisfied, the portion between silent songs is not determined to be silent, and the automatic addition position of the inter-song information (song number) is incorrect.
[0039]
On the other hand, as shown in FIG. 3B, the band control unit 24 of the present embodiment masks the frequency band W1 specified by the user from the input level information A, and The level information A ′ excluding the frequency component is extracted and sent to the level determination unit 25. With such a configuration, the noise component included in the frequency band W1 is excluded from the level determination target of the level determination unit 25. Therefore, if the other frequency components are below the determination level L, ｛A ′ <L｝ will be satisfied. Therefore, since it is possible to accurately determine a silence between music pieces as silence, it is possible to improve the accuracy of the automatic addition processing of music piece information (music number).
[0040]
Note that the first band control process described here can be said to be a suitable configuration when the frequency band of the noise component is known or can be estimated.
[0041]
Next, the second band control process will be described with reference to FIG. FIG. 4A shows level information A of an audio signal including a noise component exceeding the determination level L, similarly to FIG. 3A. If such level information A is directly input to the level determination unit 25 (silence part detection mode; determination condition X = 0), the inter-song information reference signal (for example, human real voice frequency component) intended as a determination target is determined. Although the level is below the level L, {A <L} is not satisfied, so that the silent inter-music part is not determined to be silence, and the automatic addition position of the inter-music information (song number) is incorrect.
[0042]
On the other hand, as shown in FIG. 4B, the band control unit 24 of the present embodiment masks the input level information A other than the frequency band W2 specified in advance by the user, and Is transmitted to the level determination unit 25. With such a configuration, only the frequency components (frequency components close to the inter-song information reference signal) included in the frequency band W2 are subjected to the level determination by the level determination unit 25, so that determination is made in another frequency band. Even if a noise component exceeding the level L is included, {A ′ <L} is satisfied. Therefore, since it is possible to accurately determine a silence between music pieces as silence, it is possible to improve the accuracy of the automatic addition processing of music piece information (music number).
[0043]
The second band control process described here can be said to be a suitable configuration when the frequency band of the inter-song information reference signal intended as a level determination target is known or can be estimated. The second band control process is also effective when the level determination unit 25 is set to the reference signal detection mode (determination condition X = 1). The reference signal detection mode detects a predetermined inter-song information reference signal (for example, a sine wave signal outside the audible band) inserted by the user during recording, and automatically adds inter-song information (song number) to the detected position. Mode. Therefore, if the narrow frequency band W2 including the above-mentioned inter-song information reference signal is set, it is possible to perform high-precision reference signal detection that is hardly affected by other frequency components. Of the automatic addition process can be improved.
[0044]
Next, the third band control process will be described with reference to FIG. FIG. 5A shows the level information A of the audio signal output from the SG data detection unit 23, and FIG. 5B shows the band control information W set by the input device 22. Unlike the frequency bands W1 and W2 in the first and second band control processes, the band control information W is not only information for controlling pass / non-pass of a designated band, but also information that can be weighted for each frequency component. Have been.
[0045]
As shown in FIG. 5C, the band control unit 24 performs a logical product of the above-described audio signal level information A and the band control information W to perform weighting for each frequency component. Is transmitted to the level determination unit 25. With such a configuration, it is possible to perform highly controllable adjustment in detecting a silent portion (or detecting a reference signal) of an audio signal. ) Can be realized.
[0046]
In the above-described embodiment, various variations are possible for the combination of the band control unit 24 and the level determination unit 25, and the accompanying effects appear differently.
[0047]
Next, a detailed description will be given of a second embodiment of the mini-disc recording / playback apparatus according to the present invention. FIG. 6 is a block diagram showing a second embodiment of a mini-disc recording / reproducing apparatus according to the present invention. As can be seen from this figure, the mini-disc recording / reproducing apparatus 1b of this embodiment has substantially the same configuration as that of the first embodiment. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals as those in FIG. 1 and the description thereof will be omitted. I will explain it with putting.
[0048]
The mini disc recording / reproducing apparatus 1b of the present embodiment relates to a means for realizing an automatic addition function of inter-song information (song number), instead of the band control unit 24 which is a characteristic part of the first embodiment, a judgment level adjustment. It has a part 27. Hereinafter, the process of automatically adding the inter-song information (song number) by each of the components 23, 25 to 27 will be described.
[0049]
The SG data detection unit 23 extracts the level information A of the audio signal decomposed for each frequency component, and sends out the level information A to the level determination unit 25. The level determination unit 25 compares the input level information A with a determination level L ′ obtained by a determination level adjustment unit 27, which will be described later. The signal B is transmitted to the time determination unit 26 at the next stage. Note that the determination condition X can be arbitrarily set by the input device 22. In the present embodiment, for the sake of convenience, the determination condition X is determined to meet the condition of {A <L ′} when X = 0 (silent portion detection mode), and to satisfy the condition of {A> L ′} when X = 1 ( Reference sound detection mode). As in the first embodiment, the time determination unit 26 requests the system control microcomputer 21 to automatically add the music number based on the comparison result between the output duration time t of the condition matching signal B and the detection time T.
[0050]
The determination level adjustment unit 27 is a characteristic part of the present embodiment, and generates a determination level L ′ controlled for each frequency band based on the instruction signal F set by the input device 22. FIG. 7A shows the level information A of the audio signal output from the SG data detection unit 23, and FIG. 7B shows the judgment level L ′ obtained by the judgment level adjustment unit 27. As can be seen from the figure, the judgment level L ′ obtained by the judgment level adjustment unit 27 is different from the uniform judgment level L in the first embodiment, and is a value weighted for each frequency component.
[0051]
With this configuration, the level determination unit 25 compares the level information A of the audio signal and the determination level L ′ with weighting for each frequency band, as shown in FIG. 7C. Accordingly, it is possible to perform highly controllable adjustment in detecting a silent portion (or a reference signal) of an audio signal, thereby realizing automatic addition processing of inter-song information (song number) according to user needs. can do.
[0052]
Note that in the above embodiment, various variations are possible for the combination of the determination level adjustment unit 27 and the level determination unit 25, and the accompanying effects appear differently.
[0053]
In the first and second embodiments, the case where the present invention is applied to a mini-disc recording / reproducing apparatus has been described as an example. However, the application target of the present invention is not limited to this. The present invention can be widely applied to digital recording / reproducing apparatuses for reading / writing audio signals from / to other digital recording media.
[0054]
【The invention's effect】
As described above, according to the digital recording / reproducing apparatus of the present invention, even when unnecessary noise components are included in the background of the audio signal, the inter-song information (song number) is automatically added accurately. It is possible to do.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of a minidisk recording / playback apparatus according to the present invention.
FIG. 2 is a schematic diagram for explaining detection of SG data.
FIG. 3 is a schematic diagram for explaining a first band control process.
FIG. 4 is a schematic diagram for explaining a second band control process.
FIG. 5 is a schematic diagram for explaining a third band control process.
FIG. 6 is a block diagram showing a second embodiment of a mini disc recording / playback apparatus according to the present invention.
FIG. 7 is a schematic diagram illustrating a level determination process according to the embodiment.
[Explanation of symbols]
1a, 1b Mini-disc recording / reproducing device 2 Input terminal 3 Photoelectric element 4 Digital PLL circuit 5 Frequency conversion circuit 6 ATRAC-DSP
6a Audio compression unit 6b Audio expansion unit 7 Shock proof memory controller 8 Signal processing circuit 9 Shock proof memory 10 Recording head drive circuit 11 Recording head 12 Mini disk 13 Optical pickup 14 High frequency amplifier (RF amplifier)
15 Digital / analog conversion circuit (D / A conversion circuit)
16 Output Terminal 17 Servo Circuit 18 Driver Circuit 19 Spindle Motor 20 Feed Motor 21 System Control Microcomputer 22 Input Device 23 SG Data Detection Unit 24 Bandwidth Control Unit 25 Level Judgment Unit 26 Time Judgment Unit 27 Judgment Level Adjustment Unit

Claims (4)

What is claimed is: 1. A digital recording / reproducing apparatus for reading / writing an audio signal from / to a digital recording medium, comprising: a level information detecting section for extracting level information of the audio signal for each frequency component; A band control unit that extracts a frequency band other than the frequency band specified for the level information, and compares the level information obtained by the band control unit with a predetermined determination level to determine whether or not a predetermined determination condition is met A level judging section, and a time judging section for monitoring a condition matching time in the level judging section, wherein the address information of the audio signal at the point in time when the condition matching time exceeds a predetermined time is set between the music pieces. A digital recording / reproducing apparatus for recording information on the digital recording medium. What is claimed is: 1. A digital recording / reproducing apparatus for reading / writing an audio signal from / to a digital recording medium, comprising: a level information detecting section for extracting level information of the audio signal for each frequency component; A band control unit that extracts only a frequency band specified for the level information, and compares the level information obtained by the band control unit with a predetermined determination level to determine whether or not a predetermined determination condition is met. A level judging unit, and a time judging unit that monitors a condition matching time in the level judging unit. The address information of the audio signal at the time when the condition matching time exceeds a predetermined time is set between the music pieces. A digital recording / reproducing apparatus for recording information on the digital recording medium. What is claimed is: 1. A digital recording / reproducing apparatus for reading and writing an audio signal on a digital recording medium, comprising: a level information detecting unit for extracting level information of the audio signal for each frequency component; A band control unit that weights the level information for each frequency component, and a level determination unit that compares the level information obtained by the band control unit with a predetermined determination level to determine whether a predetermined determination condition is met. And a time determining unit that monitors a condition matching time in the level determining unit, and the address information of the audio signal at the time when the condition matching time exceeds a predetermined time is used as the music interval information. A digital recording / reproducing apparatus for recording on the digital recording medium. A digital recording / reproducing apparatus for reading / writing an audio signal from / to a digital recording medium, comprising: a level information detecting section for extracting level information of the audio signal for each frequency component; and a determination section for generating a determination level weighted for each frequency component. A level adjuster for comparing the level information decomposed for each frequency component by the level information detector with the determination level generated by the determination level adjuster to determine whether a predetermined determination condition is met; A level judging section, and a time judging section for monitoring a condition matching time in the level judging section, wherein the address information of the audio signal at the point in time when the condition matching time exceeds a predetermined time is set between the music pieces. A digital recording / reproducing apparatus for recording information on the digital recording medium.

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