JP2002157826A - Information reproducing device and information reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and continuously reproduce tunes by adjusting them to the tempos of the two tunes. SOLUTION: An information reproducing device which can continuously reproduce the different tunes is provided with a first acquirement means acquiring first tempo information being tempo information of the first tune which is previously reproduced, a second acquirement means acquiring second tempo information being tempo information of the second tune which is reproduced after the first tune and a control means which automatically reproduces/controls the tempo of the second tune which is actually reproduced so that it is matched with the tempo at the time of reproducing the first tune based on first tempo information and second tempo information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing apparatus and an information reproducing method, and more particularly to an information reproducing apparatus and an information reproducing apparatus for reproducing a recording medium such as a CD (Compact Disk) on which audio information is recorded as digital data. Reproduction method.

[0002]

2. Description of the Related Art Conventionally, there has been known an analog record player system having a plurality of analog players for continuously reproducing dance music in a disco or the like.

[0003] Every customer comes to a disco to dance, and every dance music has a tempo.
o: Changing the speed of the music) is not preferable because it is difficult to dance. On the other hand, for the reason that the tempo is not changed, it is not preferable to keep playing the same song endlessly, because the change disappears and the customer loses interest in dance.

Therefore, in a disco having a conventional analog record player system, the tempo of an analog record to be reproduced next by using one analog player in advance is compared with the tempo of an analog record currently reproduced by another analog player. In addition, in order to continuously and continuously play the currently playing music from the beginning of the music, the turntable of the analog player and the analog record point at the recording surface of the analog record in a slipping state. When the playback of the previous song is over, release the finger to start playback.

[0005] In such an analog record player system, the same analog record is reproduced with a high frequency of reproduction by mechanically tracing a recording groove, and as described above, its handling is complicated, so that the sound quality deteriorates. There is a problem that it is likely to occur.

In order to solve such problems, CDs perform non-contact and digital recording, and even if they are repeatedly reproduced, the deterioration of the disc and the deterioration of the sound quality are remarkably less than those of conventional analog records. It is most suitable for applications such as a playback system in a disco or the like that repeatedly plays the same board.

Here, the configuration of a CD will be described. C
D indicates a lead-in area in which index information of recorded information is recorded, a program area in which actual audio information is recorded, and the end of the program area, from the inner peripheral side to the outer peripheral side of the disk. Lead Out (Lead O
ut) An area is formed. These three areas are collectively referred to as an information area.

The signal to be recorded is EFM (Eight to Fourt).
een Modulation) is a digital signal modulated and includes a subcode such as a time code (time information) in addition to a main code (main information) such as audio information.

In the lead-in area, TOC (Table Of)
Index information called "Contents" is recorded, and the total number of audio information (for example, the total number of songs) and the total recording time (for example, total playing time) recorded in the program area of the disc are recorded as subcodes.

[0010] In the program area, audio information and the like as a main code are recorded. In the Q channel of the subcode, a track number (TNO) indicating an audio information number (for example, a song number) is recorded. Recording time (P-TIME: for example, the playing time of the song), and the total recording time (A-TIME:
For example, the total playing time) is recorded.

[0011] In the lead-out area, a lead-out code indicating the lead-out area is recorded. In a conventional disco CD player system having a plurality of CD players using such a CD, in order to match the tempo of the previously reproduced music with the tempo of the music to be reproduced this time, each CD player uses a CD. Was changed to change the number of revolutions.

That is, if the original tempo of the song to be reproduced next is slower than the tempo of the previous song, C
By setting the rotation speed of D high, and conversely, when the original tempo of the music to be reproduced next is fast, the rotation speed of the CD is set low to keep the tempo constant.

As a specific method for continuously reproducing and outputting two music pieces, for example, a disc jockey operates two reproducing apparatuses in the following procedure. (I) While one piece of music is being reproduced and output using the first reproducing apparatus, another musical piece is reproduced using the second reproducing apparatus, and the reproduced music is listened to through headphones or the like without being output to the outside. (Ii) While listening to another song, set the playback speed in the second playback device so that the tempo of the other song matches the tempo of the one song, and search for the beginning of the other song (ie, so-called Cue). (Iii) When the end of one music currently being reproduced and output is approaching, the other music is reproduced and output from the beginning while matching the beat timing with the one music. (Iv) Stop the playback of one music piece that has been played back and output, and then prepare another music piece to be played back next to the other music piece in the first playback device. Thereafter, the disc jockey repeats the above-described procedures (i) to (iv) to continuously reproduce a plurality of different music pieces without interruption while keeping the tempo constant.

[0014]

However, in the case of performing continuous reproduction by operating the above-described disc jockey, it is actually necessary to operate a large number of switches and the like, and those who are quite proficient in these operations are required. Otherwise, there is a problem that it is not possible to continuously reproduce and output the music pieces appropriately.

Therefore, the present invention has been made in view of the above-mentioned problems, and the problem is that even those who are not proficient in continuous reproduction of music can continuously adjust the tempo of two music. An object of the present invention is to provide an information reproducing apparatus and an information reproducing method capable of reproducing.

[0016]

According to a first aspect of the present invention, there is provided an information reproducing apparatus capable of continuously reproducing different pieces of music, the first piece of music being reproduced first. First acquisition means for acquiring first tempo information that is tempo information, second acquisition means for acquiring second tempo information that is tempo information of a second music piece that is played following the first music piece, Control for automatically performing reproduction control based on the first tempo information and the second tempo information so that the tempo of the second song actually reproduced matches the tempo at the time of reproduction of the first song. And means.

[0017]

Preferred embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a schematic block diagram of a main part of a CD player.

The CD player includes a spindle motor 2 for rotating and driving the CD 1 based on a spindle servo control signal.
And a pickup 3 for irradiating the CD with readout light and receiving the reflected light to output a reproduction RF (Radio Frequency) signal, and converting the reproduction RF signal of the pickup 3 into a binary signal to separate a frame synchronization pattern. A signal processing unit that performs EFM demodulation, performs signal processing such as error correction, outputs audio data, and outputs servo control signals such as a spindle servo control signal, a focus servo control signal, and a tracking servo control signal; An audio digital signal processor (DS) that extracts a reproduction clock from the RF signal and controls the rotation, and converts it into converted audio data having a desired pitch based on the key control signal KC and outputs the converted audio data.
P) 6, a D / A converter 7 for converting the converted audio data from digital to analog and outputting it as an audio / analog output signal, and a speed control for controlling the entire CD player and controlling the rotational speed of the spindle motor. A system controller 8 that outputs a signal SC, a key control signal KC for setting a pitch, display data DD for display control, and the like.
A slide volume 10 for setting a rate of change in the number of revolutions of the spindle motor;
Analog-to-digital conversion of a voltage signal corresponding to the set position of the slider for the slide volume position data SVP
, An operation unit 11 provided with a plurality of operation keys and outputting operation key data, and a display 12 for displaying various data.

The operation unit 11 has a key invariant key for setting whether or not to change the pitch according to the rotational speed when the rotational speed of the spindle motor is changed. When the key invariable key is depressed, The system controller is instructed to perform reproduction at the original pitch irrespective of the rotation speed of the spindle motor as operation key data.

(First Embodiment) Next, the operation will be described with reference to FIGS. FIG. 2 shows an operation processing flowchart of the first embodiment. In this case, the user has two C
It is assumed that the player has a D player.

While playing the first song at a predetermined tempo on the first CD player, the user plays the next song contained in another CD, ie, the second song. The playback is performed at the normal speed, and the slider of the slide volume 10 is set so that the tempo matches the playback tempo of the first song.

At this time, one end of the slider volume 10 is connected to the ground potential, and the other end is connected to the power supply voltage. The ground potential (corresponding to the change rate of the rotation speed -9.9%) according to the slider position. Is applied to the A / D converter 9 from the power supply voltage (corresponding to the change rate of the rotation speed + 9.9%).

The A / D converter 9 outputs to the system controller 8 slide volume position data SVD according to the applied voltage, ie, according to the slider position.

Thus, the system controller 8
The position of the slide volume is determined and stored in an internal memory (not shown) (step S1). The slide volume position data S output from the A / D converter at this time
If VD is 8-bit data, 256 kinds of information can be expressed. In the case of the above example, the rate of change of the rotation speed can be expressed and set in 0.1% units.
If the number of bits (resolution) of data is increased, finer settings can be made.

Subsequently, the system controller 8 displays the rate of change (−9.9% to + 9.9%) of the rotation speed of the spindle motor 2 on the speed display section of the display 12 corresponding to the obtained slide volume position. It is displayed (step S2).

Further, the system controller 8 outputs a speed control signal SC to the PLL circuit 5 to control the rotation speed of the spindle motor 2 (Step S3).
Specifically, P is determined by the speed control signal SC.
By changing the oscillation frequency of a VCO (Voltage Controlled Oscillator) for generating a master clock signal (not shown) in the LL circuit 5 and appropriately dividing the frequency, the clock signal C having a frequency close to the frequency of the frame synchronization signal from the CD 1 is obtained.
LK is output to the signal processing unit 4. At the same time, PL
The L circuit 5 supplies a clock signal CLK to the D / A converter 7.
Is output.

Thus, the signal processing section 4 detects a phase difference between the frame synchronization signal and the clock signal CLK obtained through the pickup 3, and outputs a spindle servo control signal so that the phase difference becomes zero.

As a result, the rotation speed of the spindle motor 2 becomes a rotation speed corresponding to the rate of change specified by the slide volume 10. Next, the system controller 8
Determines whether the key invariant key 11A of the operation unit 11 is pressed down (step S4).

If the key invariant key 11A is not depressed, the process proceeds to step S9. When the key invariable key 11A is depressed, the change rate of the current rotation speed of the spindle motor 2 is a) -9.9 to -9.9.
Within the range of 0.1% b) 0% c) It is determined which of the cases is within the range of +0.1 to + 9.9% (step S5).

The rate of change of the rotation speed of the spindle motor 2 is
If it is within the range of -9.9% to -0.1%, a key control signal KC is output to the audio DSP 6 to increase the pitch (key) according to the rate of change (step S).
6).

Specifically, the rate of change of the number of revolutions is -5.4%
In the case of, since the pitch is lowered by 5.4%, a key control signal KC for increasing the pitch by 5.4% is output. With this, the audio DSP
Converts the audio data output from the signal processing unit 4 into converted audio data having a pitch corresponding to the key control signal KC, and outputs the converted audio data to the D / A converter 7.
As a result, the D / A converter outputs an audio analog output signal having the same pitch as the pitch at the time of the original reproduction regardless of the rotation speed of the spindle motor.

At the same time, the system controller 8
The display data DD is output to the display 12, and a natural symbol (significant symbol) is displayed and lit on the display 12 (step S8).

If it is determined in step 5 that the rate of change in the number of revolutions of the spindle motor 2 is 0%,
The display data DD is output to the display 12, and a natural symbol (significant symbol) is displayed and lit on the display 12 (step S8).

When the rate of change of the number of revolutions of the spindle motor 2 is within the range of +0.1 to + 9.9%,
The key control signal KC is output to the audio DSP 6, and the pitch (key) is lowered according to the rate of change (step S7). Specifically, the rate of change of the number of revolutions is + 3.2%.
In the case of, since the pitch is 3.2% higher, a key control signal KC for lowering the pitch by 3.2% is output. With this, the audio DSP
Converts the audio data output from the signal processing unit 4 into converted audio data having a pitch corresponding to the key control signal KC, and outputs the converted audio data to the D / A converter 7.
As a result, the D / A converter outputs an audio analog output signal having the same pitch as the pitch at the time of the original reproduction regardless of the rotation speed of the spindle motor.

At the same time, the system controller 8
The display data DD is output to the display 12, and a natural symbol (significant symbol) is displayed and lit on the display 12 (step S8).

As described above, the key invariant key 11A
Is depressed, reproduction can be performed at the same pitch as during normal reproduction regardless of the rotation speed of the spindle motor 2, that is, regardless of the tempo.

On the other hand, if the key invariable key 11A is not depressed as a result of the determination in step S4, the system controller 8 determines that the current rate of change of the rotation speed of the spindle motor 2 is a) -9.9 to -0. Within 1%, b)
0%, c) It is determined which case it is in the range of +0.1 to + 9.9% (step S9).

The rate of change of the rotation speed of the spindle motor 2 is
When the pitch is within the range of -9.9 to -0.1%, the display data DD is output to the display 12 because the pitch is lower than that during the normal reproduction, and the flat symbol (variable symbol) is used. Is displayed on the display 12 (step S10).

If it is determined in step 9 that the rate of change in the number of revolutions of the spindle motor 2 is 0%,
The display data DD is output to the display 12, and a natural symbol (significant symbol) is displayed and lit on the display 12 (step S8).

When the rate of change of the number of revolutions of the spindle motor 2 is in the range of +0.1 to + 9.9%,
Since the pitch is higher than in the normal reproduction, the display data DD is output to the display 12, and the sharp symbol (sharp symbol) is displayed on the display 12 (step S11).

As described above, the key invariant key 11A
Is not pushed down, the spindle motor 2
The display corresponding to the number of rotations, that is, the tempo is performed.

Here, the key invariant operation in the audio DSP will be described with reference to FIGS. The principle of the key invariant operation in the audio DSP is based on the original signal (FIG. 3).
(A) When the voice data corresponding to (1) is written to a memory (not shown) and the data is read, when the pitch (key) is raised, the data is thinned out and when the pitch is lowered, the data is repeatedly read. It is. As a result, the signal at the time of reproduction is as shown in FIG. 3B (when the pitch is raised) and FIG. 3C (when the pitch is lowered).

More specifically, when the pitch is increased by 1%, data of one sample is skipped per 100 samples of data. Similarly, when the pitch is decreased by 1%, one sample is read for every 100 samples of data. Is realized by reading the data twice.

By the way, when the above-described processing is actually performed continuously, the writing speed of audio data is constant, and when the pitch is increased, the data is skipped because the data is skipped. Data may be insufficient, and when the pitch is lowered, the data is repeatedly read, so that the audio data stored in the memory becomes excessive and the capacity of the memory becomes insufficient.

Therefore, when the processing is actually performed, FIG.
As shown in (1), the audio data is initialized every predetermined time (interval time) and the processing is continued. As a result, when the pitch is increased, a portion where the same sound is repeated occurs, and when the pitch is decreased, a portion where the sound is lost occurs. However, there is no shortage of sound data, and the memory capacity is equivalent to the interval time. It does not require a huge amount of memory.

As described above, when the audio data is initialized every interval time,
The reproduced waveform of the original signal shown in FIG.
5B, distortion is generated as shown in FIG. 5C, and this distortion causes noise.

By focusing on the portion where the audio data is initialized, it can be seen that the phase is advanced or delayed by one sampling period. Therefore, when lowering the pitch, as shown in FIG. 6A, distortion can be reduced by performing smoothing in which the output ratio is gradually shifted from the original signal to the first-order lag signal.

When the pitch is to be increased, FIG.
As shown in (b), distortion can be reduced by performing smoothing in which the output ratio is gradually shifted from the first-order delayed signal to the original signal.

As described above, by performing various processes, the key invariant operation can be performed with little distortion without increasing the memory capacity of the audio DSP.

After the keys are fixed, the audio data is stored in a buffer memory (not shown) in advance, and the audio data is output from the buffer memory at the same time when the CD player is switched, and the data is sequentially reproduced through the buffer memory. As a result, continuous playback can be performed without interruption as in the case of the conventional analog record player system.

As described above, according to the first embodiment, only the reproduction speed can be varied while keeping the pitch constant, so that the connection can be made without interruption without unnaturalness in audibility. Continuous playback can be performed.

When the key invariant key is not depressed, the tone of the music reproduced this time can be raised or lowered in accordance with the music reproduced last time, so that the user can select from a wider range of tones. .

Second Embodiment In the first embodiment, the time information (for example, playing time, remaining playing time, and the like) to be displayed on the display 12 is based on the above-described subcode data. This is different from the real time (real time) when the reproduction is performed while changing the rotation speed of the spindle motor 2, which is practically inconvenient.
Therefore, in the second embodiment, the real time can be displayed even when the rotation speed of the spindle motor is changed. The operation of the second embodiment will be described with reference to FIGS.

The total recording time (for example, the total playing time) recorded as a subcode of the lead-in area on CD1
And the recording time (P-TI) from the track start position recorded as the Q channel of the subcode of the program area.
ME: for example, the playing time of the song), track number = 1
The total recording time (A-TIME: total playing time, for example) measured from is recorded as time information.

The time information is stored in the spindle motor 2
Is rotated at the normal rotation speed to perform the normal reproduction. When the spindle motor 2 is operated with the rotation speed changed, the value becomes meaningless.

However, the time information is output from the signal processing unit 4 to the system controller 8 as time information data TI even when the number of revolutions is changed as in the case of the normal reproduction.

Then, the system controller 8 converts the time information data TI in accordance with the rate of change of the number of revolutions indicated by the slide volume position data SVP to obtain the real time data RTI and the corresponding display data DD on the display. Display real-time information.

FIG. 7 shows a display example of real-time information when the rate of change in the number of revolutions of the spindle motor 2 is set to + 5.0%. FIG. 7 shows a case where the remaining performance time is displayed.
The upper row shows that the remaining performance time of the song having the song number = 1 is 2 minutes and 10 seconds. This display is based on the time information of the subcode recorded on the CD1, and has no substantial meaning.

In the lower part, a real-time display is performed based on the real-time data RTI obtained by the system controller 8, and the tune when the change rate of the rotation speed of the spindle motor 2 is + 5.0%. It is shown that the actual remaining playing time of the song with the number = 1 is 2 minutes and 4 seconds.

Here, a method of converting the time information data TI into the real time data RTI will be described. Change rate of rotation
If R, RTI = (1 + DR) × TI.

Specifically, in the case of the above example, RTI =
(1 + 0.05) × (2 minutes 10 seconds) = 2 minutes 4 seconds.

As described above, according to the second embodiment, even when the number of revolutions of the spindle motor is changed, it is possible to display the actual playing time, the remaining playing time, and the like. The preparation time for reproducing the next music can be easily grasped, and the usability is improved.

(Third Embodiment) In each of the above embodiments, the user manually sets the tempo of the music to be reproduced next. However, in the third embodiment, the tempo of the music to be reproduced next is changed. Is set automatically. CD recording signals include:
One subcode consisting of 8 bits per frame
Are recorded. The 8-bit data is named P, Q, R, S, T, U, V, W for each bit, and the first 2-bit data of P and Q is the beginning of the music. Also, it is used to have a program function of playing back according to a preset order, and the 6-bit data of R to W is used to perform various controls such as display which cannot be performed by the conventional analog record. ing. When sub-codes are actually used, 98 frames are treated as one sub-code block (96 × 8 bits).

Therefore, the tempo information is recorded in an appropriate empty area of the subcodes R to W (98 × 6 bits), and by referring to the tempo information, the tempo is automatically set to the desired tempo. Can be combined.

More specifically, assuming that the tempo during normal rotation of the spindle motor is 100 beats / minute, tempo data = “100” is recorded in advance in the subcode of the CD.

At the time of continuous reproduction of a CD, the tempo data TDn-1 of the currently reproduced CD and the C to be reproduced next
With reference to the tempo data TDn of D and the current change rate DRn-1 of the rotational speed of the spindle motor, the change rate DRn of the rotational speed of the spindle motor at the time of next reproduction is obtained by the following equation.

DRn = (TDn-1 × DRn-1) / TDn Thus, even when a CD having a different tempo during normal reproduction is reproduced, the same tempo can be automatically set and the reproduction can be performed without interruption while the rotation speed of the spindle motor is being changed. .

[0068]

According to the first aspect of the present invention, in an information reproducing apparatus capable of continuously reproducing different music pieces, the first tempo information which is the tempo information of the first music piece which is being reproduced earlier is stored. First acquisition means for acquiring, second acquisition means for acquiring second tempo information which is tempo information of a second music piece to be reproduced following the first music piece, and the first tempo information and the second tempo information.
Control means for automatically performing playback control based on the tempo information so that the tempo of the second tune actually reproduced matches the tempo at the time of the reproduction of the first tune. In addition, even a person who is not proficient in the continuous reproduction of music can continuously reproduce two musics at the same tempo.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a main part of a CD player.

FIG. 2 is an operation processing flowchart of the first embodiment.

FIG. 3 is a diagram illustrating the principle of a key invariant operation.

FIG. 4 is an explanatory diagram of an actual key invariant operation process.

FIG. 5 is an explanatory diagram of a distortion occurrence state in the initialization of audio data.

FIG. 6 is an explanatory diagram of a smoothing process at the time of a key invariant operation.

FIG. 7 is an explanatory diagram of a display state of real-time data.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... CD 2 ... Spindle motor 3 ... Pickup 4 ... Signal processing unit 5 ... PLL circuit 6 ... Audio digital signal processor (DS)
P) 7 D / A converter 8 System controller 9 A / D converter 10 Slide volume 11 Operation unit 11 A Key invariant key 12 Display 12 SVP Slide volume position data TI Time information data RTI Real time Data SC: Speed control signal KC: Key control signal DD: Display data

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D044 AB05 BC03 CC06 FG23 GK02 GK10 5D077 AA23 BA03 BA04 BA18

Claims (4)

[Claims] 1. An information reproducing apparatus capable of continuously reproducing different songs, a first acquisition unit for acquiring first tempo information which is tempo information of a first song reproduced earlier, Second acquisition means for acquiring second tempo information, which is tempo information of a second music piece to be reproduced following the first music piece; actual reproduction based on the first tempo information and the second tempo information An information reproducing apparatus having control means for automatically performing reproduction control so that the tempo of the second music to be played matches the tempo at the time of reproduction of the first music. 2. The recording medium has tempo information recorded thereon, and the first acquisition unit and the second acquisition unit read the tempo information, thereby reading the first tempo information and the second tempo information. The information reproducing apparatus according to claim 1, wherein the information reproducing apparatus acquires the information. 3. The tempo of the second tune actually reproduced by adjusting the number of revolutions of a spindle motor for rotating the recording medium so that the tempo of the first tune during reproduction of the first tune is adjusted by the control means. 3. The information reproducing apparatus according to claim 1, wherein reproduction control is automatically performed so as to coincide with the information. 4. An information reproducing method for continuously reproducing different songs, wherein: a first acquiring step of acquiring first tempo information which is a tempo information of a first song reproduced earlier; A second acquisition step of acquiring second tempo information that is tempo information of a second song that is reproduced following the song; and a second acquisition process that is actually reproduced based on the first tempo information and the second tempo information. Controlling the reproduction automatically so that the tempo of the second music matches the tempo at the time of reproduction of the first music.