JPH04278258A - Acoustic circuit - Google Patents

Abstract

PURPOSE:To make the tempo of a rhythm correspond to musics before and after the rhythm automatically by recording the rhythm for avoiding the intermission of sound between the musics at the same time when a plurality of musical compositions are recorded on a tape. CONSTITUTION:The tempo of a regenerated musical composition is detected with a tempo detecting means 2 before the end of the music. A tempo T1 of the regenerated music is held in a memory 14. When the play of the music is finished, the rhythm is regenerated at this tempo. After the regeneration of the music is finished, the tempo of the next musical composition is detected. A tempo T2 of the next music is held in the memory 14. The tempo of the rhythm is slowly changed until the tempo of the rhythm becomes equal to the tempo of the next music. When the tempo of the rhythm becomes equal to the next music, the regeneration of the next music is started.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio circuit used in audio equipment such as radio cassette recorders and system stereos.

0002

2. Description of the Related Art When dubbing music from a compact disc player (CD) or the like onto a tape using conventional audio equipment, there is a desire to perform tape editing without interruptions in the sound between songs. When performing this type of tape editing, first dub a certain song onto tape, then set the tape accurately at the end of the recorded song, and use another sound source to create rhythms, etc. to connect with the next song. It is necessary to record from one song and then record the next song.

0003

[Problems to be Solved by the Invention] However, such an operation is not only very time-consuming, but also has the disadvantage that it is necessary to prepare a sound source such as a rhythm to be inserted between songs. Furthermore, if the tempos of the songs are different, even if other sound sources are connected to connect the songs, musical unnaturalness may occur.

The present invention has been made in view of the problems of conventional audio circuits, and it facilitates the operation of recording a plurality of songs onto a tape, and also allows recording without discontinuous tempo. The technical challenge is to make it possible.

[0005]

[Means for Solving the Problem] As shown in FIG. 1, the invention of claim 1 of the present application includes a signal reproducing means 1 for sequentially reproducing a plurality of songs having a unique tempo, and a signal reproducing means 1 for sequentially reproducing a plurality of songs having a unique tempo. A tempo detecting means 2 that detects the tempo of a song, a rhythm generating means 3 that generates a rhythm at an arbitrary tempo, and a playing song tempo that maintains the tempo of the song being played that is detected by the tempo detecting means before the end of the song. holding means 4; next song tempo holding means 5 for playing the next song to be played and holding the tempo of the next song detected by the tempo detection means; and at the end of the song being played, the rhythm generating means plays the next song. Rhythm tempo correction means 6 that generates a rhythm with the same tempo as the tempo held by the song tempo holding means and controls the tempo to gradually approach the tempo of the next song held by the next song tempo holding means, and signal reproduction means and a signal from the rhythm generating means, and when the played song ends, the rhythm generating means switches to rhythm generation, and after the tempo of the rhythm being generated matches the tempo of the next song, the rhythm generation starts and the next song is played. The present invention is characterized by comprising a signal switching means 7 for switching.

[0007] In the invention of claim 2 of the present application, as shown in FIG. Rhythm level control means 8 gradually lowers the signal level obtained from the rhythm generation means when the rhythm generation means stops generating the rhythm, and gradually lowers the reproduction level obtained from the signal reproduction means immediately after the end of the reproduction of the previous song, and It is characterized by comprising a music level control means 9 for gradually increasing the level obtained from the signal reproduction means at the start of reproduction of the music, and a mixing means 10 for mixing the signals obtained from the signal reproduction means and the rhythm generation means. It is something to do.

[0007]

[Operation] According to the invention of claim 1 of the present application having such features, the tempo detecting means detects the tempo immediately after the end of the previous song, and the rhythm generating means detects the same tempo as the previous song at the end of the song. A tempo rhythm is generated, the tempo is gradually changed in accordance with the tempo of the next song, and the next song is played after the tempo substantially matches that of the next song.

Further, in the invention of claim 2 of the present application, when the previous song ends, the playback level is gradually lowered to perform a fade-out, and at the same time, the rhythm level is gradually increased to perform a fade-in. Furthermore, after the rhythm tempo matches the tempo of the next song, the next level is gradually raised to perform a fade-in, and the rhythm level is gradually lowered to perform a fade-out process.

[0009]

Embodiment FIG. 2 is a block diagram showing the configuration of an audio device according to an embodiment of the present invention. In the figure, a CD player 11, which is a signal reproducing means 1, sequentially reproduces songs according to a selection signal from a control section 12, and its output signal is given to a tempo detecting section 2 and a signal switching means 7. The tempo detection means 2 detects the tempo of the input signal, and is composed of a predetermined filter and a block that detects the cycle of its output, and its output is given to the control section 12. Further, a control code including a time code of the CD player 11 is given to the control section 12. Control part 1
2 has a CPU 13, a memory 14, an input interface (IF) 15, and an output interface 16, and as described later, detects the tempo of the song at the end of the song, generates a rhythm, and synchronizes with the next song. It is what makes the connection. Here, the memory 14 is provided with an area for holding the tempo T1 of the currently playing music and a tempo T2 of the next song to be played, as well as an area for holding the tempo change rate ΔT.

This acoustic circuit also includes a ROM 17 that stores sound source data as the rhythm generating means 3, a data reading section 18 that reads out data from the ROM 17, and a D/A converter 19 that converts the read data into an analog signal. have. The output of the D/A converter 19 is given to the signal switching means 7. As shown in the figure, the signal switching means 7 includes level controllers 21 and 22 that control the levels of the audio signals from the rhythm generating means 3 and the CD player 11, respectively, and a mixer 23 that is a mixing means 10 that mixes the outputs thereof. are doing. The output of mixer 23 is given to speaker 25 via AF amplifier 24.

Next, the operation of this embodiment will be explained with reference to the flow chart of FIG. 3 and the time chart of FIG. 4. First, while the CD player 11 is playing music A selected by the control section 12, a time code is given to the control section 12. During playback, when time t1 comes near to the end of song A, the tempo of song A is read out from tempo detecting means 2 and held in memory 14 as playback song tempo T1. The process then proceeds to step 42 and waits until a specified time before the end of the reproduction of song A. At time t2, which is a designated time before the end, the process proceeds from step 42 to step 43, where fade-out processing is performed to gradually lower the level of song A. This is output interface 1 from control unit 12.
providing a control signal to the level controller 22 via 6;
This is done by gradually lowering the output level of song A on the CD player as shown in FIG. 4(a). Also step 4
4, a control signal is given to the rhythm generating means 3 with the tempo T=T1, the rhythm data is read out, and a rhythm R signal is given to the level controller 21 of the signal switching means 7 by D/A conversion. Then, fade-in processing is performed by gradually increasing the output of the level controller 21 as shown in FIG. 4(b). Then, in step 45, it is checked whether the song A has faded out, and if it has not faded out, the process returns to step 43 and the same process is repeated.

[0012] Then, at time t3 when the reproduction of the song A ends, the output level of the rhythm R is kept constant as shown in FIG. 4(b). Then, at time t4 after a predetermined time, step 4
Steps 6 and 47 instruct the CD player 11 to play the next song B, detect the tempo T2 of the next song B, and store it in the memory 14. Then, the process proceeds to step 48, where the tempo T1 is set in the tempo T area, and the process further proceeds to step 49, where the rhythm tempo T is changed by a fixed amount of change ΔT, and the rhythm generating means 3
give to The process then proceeds to step 50 to check whether the rhythm tempo is substantially equal to the tempo T2 of the next song B. If they do not match, the process returns to step 49 to change the rhythm tempo and wait until they match. In this manner, after time t4, the tempo of rhythm R is gradually changed from T1 to T2 as shown in FIG. 4(c). Here, in steps 48 to 50, the control unit 12 controls the playback song tempo T.
Generates a rhythm with the same tempo as 1 and sets the tempo T2 of the next song.
This achieves the function of the rhythm tempo correction means 6, which controls the rhythm tempo so that it gradually approaches .

When the rhythm tempo T becomes substantially equal to T2, the process proceeds to step 51 and the rhythm is changed as shown in FIG. 4(b).
As shown in , the level is gradually lowered and faded out, and at the same time, in step 52, the next song B is played again from the beginning and faded in. This process is then repeated until the level of rhythm R becomes 0 (step 5).
3) At time t7 when the rhythm fades out, the next song B is controlled to have a constant level, and this process is completed. Here, steps 44, 51, and 53 of the level controller 21 and the control unit 12 control the rhythm level, which gradually increases the level when the rhythm occurs before the end of the playback of the song, and gradually decreases the level when the rhythm generation stops. The level controller 22 and steps 43, 45, and 52 of the control unit 1 perform the function of the control means 8, and the level controller 22 and steps 43, 45, and 52 of the control unit 1 are used to control the level controller 22 and the steps 43, 45, and 52 of the control unit 1. Level control means 9
This function has been achieved.

In this embodiment, the time at which the output level of the previous song A starts to fade out coincides with the time t2 at which the rhythm fades in, and the time at which the previous song A ends and the time t3 at which the rhythm level is kept constant. Although these are made to match, they may be set independently. Also, the time when the next song B starts to fade in is made to match the time t6 when the level of the rhythm R is lowered, and the time when the rhythm R disappears is made to match the time t7 when the level of the next song is made constant. However, it goes without saying that these may also be set independently.

Further, in this embodiment, the signal switching means 7 is constructed using the rhythm level control means 8, the music level control means 9, and the mixing means 10, but it is constructed as a switch circuit that simply switches between the rhythm and the music. It is also possible to avoid fade-in and fade-out processing at the transition between the song and the rhythm. It is preferable to configure this so that it can be selected depending on the music to be played. Further, the change in rhythm tempo is not limited to a fixed amount change as in this embodiment, but can be changed by various other characteristics such as an exponential change as necessary. Furthermore, in this embodiment, C is used as the signal reproducing means 1.
Although a D player is used, various other signal reproducing means having time codes, such as an optical disc player or a DA
T or the like may also be used.

[0016]

Effects of the Invention As explained in detail above, according to the invention of claim 1 or 2 of the present application, when creating a tape recording a plurality of songs by connecting the songs with an appropriate rhythm, the tape can be played back. Between songs, the tempo changes gradually from the previous song to the next, making it possible to add a rhythm that doesn't feel unnatural. Further, an effect can be obtained in that the work for creating such a tape can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the functional configuration of the present invention.

FIG. 2 is a block diagram showing the configuration of an acoustic circuit according to an embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of this embodiment.

FIG. 4 is a time chart showing the operation of this embodiment.

[Explanation of symbols]

1 Signal reproducing means 2 Tempo detection means 3 Rhythm generation means 4. Playback song tempo retention means 5 Next song tempo holding means 6 Rhythm tempo correction means 7 Signal switching means 8 Rhythm level control means 9 Song level control means 10 Mixing means 11 CD player 12 Control section 21, 22 Level controller 23 Mixer

Claims (2)

[Claims] 1. A signal reproducing means for sequentially reproducing a plurality of songs having a unique tempo, a tempo detecting means for detecting the tempo of the songs played by the signal reproducing means, and a rhythm generating a rhythm of an arbitrary tempo. generating means; playing song tempo holding means for holding the tempo of the currently playing song detected by the tempo detecting means before the end of the song; a next song tempo holding means for holding the tempo of the next song; and at the end of the song being played, the rhythm generating means generates a rhythm having the same tempo as the tempo held in the playing song tempo holding means; Rhythm tempo correction means controls the tempo to gradually approach the tempo of the next song held by the next song tempo holding means, signals from the signal playback means and the rhythm generation means are applied, and when the playback song ends, the rhythm tempo An acoustic circuit characterized in that it is equipped with a signal switching means that switches the rhythm generation by the generating means and switches from the rhythm generation to the reproduction of the next song after the tempo of the rhythm being generated matches the tempo of the next song. . 2. The signal switching means increases the level of the signal obtained from the rhythm generating means when the rhythm is generated before the end of the reproduction of the previous song, and increases the level of the signal obtained from the rhythm generating means when the rhythm generating means stops generating the rhythm. rhythm level control means for gradually lowering the signal level obtained by the signal reproducing means immediately after the end of the reproduction of the previous song; and rhythm level control means for gradually lowering the reproduction level obtained by the signal reproducing means immediately after the end of the reproduction of the previous song, and the level obtained by the signal reproducing means when starting the reproduction of the next song. 2. The acoustic circuit according to claim 1, further comprising: a music level control means for gradually increasing the level of the music; and a mixing means for mixing the signals obtained from the signal reproduction means and the rhythm generation means.