JPH0323499A - Artifical stereophonic musical sound reproducing device - Google Patents

Abstract

PURPOSE:To set sound images of respective parts and generate a stereophonic sound which provides a sufficient feeling of stereophony by providing a musical sound signal generating circuit, a sound image select signal generating circuit which outputs a 1st and 2nd select signal, a 1st and a 2nd signal holding means, and a 1st and a 2nd audio circuit. CONSTITUTION:The musical sound signal generating circuit 17 outputs a musical sound signal based upon score information by parts on a time-division basis. The sound image select signal generating circuit 19 outputs the 1st and 2nd select signals every time the musical sound signal generating circuit 17 outputs a musical sound signal of each part based upon the specified algorithm. The 1st and 2nd signal holding means are controlled with the 1st and 2nd select signals to hold and output the musical signal from the musical sound signal generating circuit 17 to the 1st and 2nd audio circuits 25 and 27. Therefore, a musical sound signal supplied to the 1st audio circuit 25 and a musical sound signal supplied to the 2nd audio circuit 27 are determined with the select signals. Consequently, sound images can be determined by the parts and a musical sound signal which provides the sufficient feeling of stereophony is generated without any user's operation.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a pseudo-stereo musical sound reproducing device, and more particularly to a pseudo-stereo musical sound reproducing device suitable for reproducing music sounds of teletext broadcasting. .

(Conventional Technique #i) Conventionally, when musical tone information is transmitted by wired or wireless communication, there is a method of converting the musical tone information into digital codes and transmitting them, taking into account the occupied bandwidth, S/N ratio, etc. has been adopted. This method is disclosed in JP-A-58-114099 and JP-A-58-114100. On the transmitting side, the Rakuura information is converted into a digital signal, and the converted digital score information is transmitted every minute from par 1;'
It is output as FI L-'. Note that sheet music information includes information such as intervals, timbres, and notes necessary to obtain musical sounds, as well as information such as clefs, key signatures, time signatures, and notes written in the translation list, etc. for playing music. This is a general term for the information necessary for this purpose.

Figure 5 shows how the digital musical score information described above is received and the
FIG. 2 is a block diagram showing a music and playback system for playing music.

The receiving circuit 2 demodulates the 3n information from the signal induced in the antenna 1 and provides it to the error correction circuit 3. The score information is error-corrected in the error correction circuit 3 and stored in the main storage device 5 via a microcomputer (hereinafter referred to as MP) 4.The score information stored in the main storage device 5 is M
P (read out for each part by J4 and sent to musical sound generation circuit 6
It is given to A to 6P respectively. When the musical score information of each part is inputted to the musical sound generating circuits 6APJ to 6Pl, a musical sound signal having a timbre based on this musical score information is outputted. These musical tone signals are synthesized by a microphone 7, amplified by a low frequency amplifier 8, and output as sound from a speaker 9.

Furthermore, Japanese Patent Application Laid-Open No. 61-238200 proposes a method of generating pseudo-stereo musical tones from monaural music 1n information transmitted from the transmitting side.

FIG. 6 is a block diagram showing such a conventional pseudo-stereo music reproduction device.

Similarly to FIG. 5, the musical tone signals of each part are outputted from the musical tone generating circuits 68 to 6P.

These musical tone signals are input to input terminals 11 of dividing circuits 10A to 10P as shown in FIG. A variable resistor 12 is connected between the input terminal 11 and the reference potential point. 13 are connected in parallel, and variable resistors 12. The sliding ends of 13 are respectively output terminals 14. 15. variable resistance 12,1
3 is such that the movable ends are moved in mutually opposite directions, and the variable resistor 12. By adjusting the resistance value of 13, the input musical tone signal is divided at a predetermined ratio and output to output terminal 14. 15. Musical tone signals from the output terminals 14 of the dividing circuits 108 to 10P are combined in a mixer 7A, amplified in a low frequency circuit 8A, and outputted from a speaker 9A. On the other hand, the musical tone signals from each output pane 15 of the dividing circuits 10A to 10P are combined in a mixer 7B, amplified in a low frequency amplification circuit 8B, and outputted from a speaker 9B. Split circuit 10A
By appropriately setting the resistance ratio of 10P to 1, the music g signal of each part can be outputted from the left and right speakers at a predetermined ratio, and the sound image of each part 1d can be freely set. Therefore, in order to obtain stereo richness, there is no need to separately transmit left and right score information on the transmitting side, and there is no need to separately provide storage devices for left and right score information even on the receiving side. .

Note that dividing the musical sound signals of all parts into equal ratios of left and right υ1 and outputting them from the left and right sub-boards is the same as outputting monaural music from two left and right speakers, and a sufficient stereoscopic It is not possible to obtain a stereo name that gives a good impression. Therefore, the user can set the sound image for each part by adjusting the dividing circuits 10Δ to 10P, for example, to output the melody part mainly from the left speaker and the accompaniment part (bass part) from the right speaker. There is a must-have item.

By the way, in text and multi-city broadcasting, in addition to information for displaying characters and graphics, musical score information for adding music sounds is also transmitted.

It is conceivable to use the above-mentioned conventional pseudo-stereo A entertainment playback device as a playback device for such music sounds. However, in a teletext broadcast, the user cannot grasp the contents of the received musical score information. Therefore, it is impossible for Yuri to determine the sound image of each part by adjusting the dividing circuits 10A to 10P.Also, even if the music information can be known, it is impossible to determine the sound image of each part by adjusting the dividing circuits 10A to 10P. {Since the information for determining the sound image is not included, there is a problem in that it is extremely difficult for the user to determine the sound image of each part.Furthermore, the user has to adjust the dividing circuits 10A to 10P as appropriate. By doing this, even if an ideal stereo sound is obtained, the number of split circuits differs depending on the song, so the division circuit 10 is divided for each song.
If you do not adjust A to 10p, the left and right speakers 9A
．． There was also the problem that the sound transmission from 9B became unbalanced, resulting in extremely poor quality.

<Problems to be Solved by the Invention> As described above, in the conventional pseudo-sudereo musical sound reproduction device described above, the user has to adjust the dividing circuit for each moe to determine the sound image of each bart f + j, There was a problem in that it was extremely difficult to obtain a three-dimensional effect.

The present invention has been made in view of such problems, and includes:
Generates stereo sound with sufficient three-dimensionality by making it possible to set the sound image of each part without user operation1
An object of the present invention is to provide a pseudo-stereo music reproduction device that can perform

[Structure of the Invention] (Means for Solving the Problems) The pseudo-Sudereo musical tone reproduction device according to the present invention is a musical tone signal that time-divisionally outputs musical tone signals H based on digitally encoded musical information for each part. a sound image selection signal generation circuit that is given information regarding the number of parts and outputs first and second selection signals based on a predetermined algorithm; and a sound image selection signal generation circuit that is controlled by the first selection signal and generates the musical tone signal. a first signal holding means for holding and outputting a musical tone signal of the circuit or outputting a signal at a predetermined level; and a first signal holding means for holding and outputting a musical tone signal of the musical tone signal generation circuit controlled by the second selection signal. or a second signal holding means that outputs a signal at a predetermined level, a first audio circuit that outputs sound based on the output of the first signal holding means, and an output of the second signal holding means. A second audio circuit outputs sound based on the sound.

(Function) In the present invention, the musical tone signal generation circuit time-divisionally outputs musical tone signals based on musical information for each part. Based on a predetermined algorithm, the sound image selection signal generation circuit selects the first sound image selection signal every time the musical sound signal generation circuit outputs the musical sound signal of each bar 1.
and outputs a second selection signal. The first and second signal holding means are controlled by the first and second selection signals to hold the musical tone signal from the musical tone signal generation circuit, and the first and second signal holding means
output to the audio circuit. Therefore, the musical tone signal supplied to the first audio circuit and the musical tone signal supplied to the second audio circuit are determined by the selection signal. Therefore, the musical tones of each bar 1 to 1 can be divided into the first and second audio circuits according to a predetermined algorithm, and the sound image can be determined for each part.

(Example) Examples of the present invention will be described below in detail based on the drawings.
Do 1. FIG. 1 is a block diagram showing an embodiment of a pseudo-stereo music reproduction device according to the present invention.

In Fig. 1, the same bows as in Fig. 6 are marked with {J.

An antenna 1 that receives a signal containing score information, a receiving circuit 2 that demodulates score information from the received signal, an error correction circuit 3 that corrects errors in the score information, and corrected score information are transmitted in parallel for each part. The configuration of the main storage device 5 in which the information is stored is the same as the conventional one. The MPU 16 stores the musical score information from the error correction circuit 3 in parallel in the main memory device 5, and sequentially outputs the musical score information from the main memory device 5 in parallel and supplies it to the musical tone generation circuit 17. The songs included in the score information are
It is composed of first to nth melody parts (hereinafter referred to as M1 to Mn) and first to mth rhythm parts (hereinafter referred to as R1 to Rll1). The musical tone generation circuit 17 generates digital musical tone signals for each part based on inputted musical score information. Further, the musical tone generating circuit 17 is configured to allocate this digital musical tone signal to the first to (m+n) channels at a predetermined clock timing and output it to the select circuit 18 in a time-division manner. For example, in level 8 of teletext, 6
A music sound is composed of 1 melody part and 5 rhythm parts, and if it is made to correspond to this,
The musical tone generation circuit 17 includes one of M1 to M6 and R1 to R5.
The musical tone signal of one part is assigned to the Oth to 10th channels and outputted in a time-division manner. Note that the order indicated by subscripts M1 to Mn and R1 to Rll is the order of reception or a predetermined priority order.

Furthermore, the MPU 16 is configured to provide the sound image selection signal generation circuit 19 with information indicating the number of melody parts and the number of rhythm parts of the song to be reproduced, based on the musical score information. The sound image selection signal generation circuit 19 includes M
In response to the part number command from P U 16, selection signal 80 . Outputs 31. That is, the musical tone generation circuit 17
When assigning and outputting musical tone signals of the first to nth melody variations to the first to n'f-th channels, respectively,
The sound image selection signal generation circuit 19 outputs a high level (hereinafter referred to as "mouth") selection signal @So, 81 when the musical tone signal of the first channel is output, and when the music blind signal of the second channel is output. When output, the selection signal SO
When the musical tone signal of the third channel is outputted, the selection signal SO of ゛L11 and the selection signal 81 of ``mouth'' are outputted. S1 is output, and thereafter, each time the musical tone signal of each channel is sequentially output, the selection signal SO, ゛L 11 of S1 is output.
or switch the "mouth". Note that if n is an even number, when the musical tone signal of the nth channel is output,
7 H J1 selection signal SO. S1 is output. Also, when the musical tone generation circuit 17 assigns and outputs the 9! sound signals of the first to lm rhythm bars to the (n+1> to (m+n)th channels, respectively), the selection signal SO.S1 is Determine “L” or “Tobi”.

By appropriately setting ``L'' or ``G1'' of this selection signal @SO, 31, the sound image of each part is determined, as will be described later. In this embodiment, the sound image of each part is determined by the algorithm shown below. That is, the first
The sound image of the melody part or rhythm bart is positioned at the center of the left and right speakers (not shown) (hereinafter referred to as the center sound image), and the vI image of bar 1 to bar 1 after the second melody part or rhythm bart is placed in the center of the left and right speakers (not shown). (hereinafter referred to as the left sound image) and the right speaker position (hereinafter referred to as the right sound image). If the number of parts is even, the last melody bart or rhythm part is switched to the center Wt.
'fl. In Table 1 below, both melody bart and rhythm bart are composed of 4 barts, and the 1st to 8th barts are composed of 4 barts.
On the stage where M1 to M4, R1 to R4 are assigned to the channels, the sound image position and selection signals so and si of each part according to the algorithm described above are shown, and the following second
In the table, the melody part is 5 parts, the rhythm part is 3 parts, and channels 1 to 8 have M1 to M5. When R1 to R3 are assigned, the sound image position of each bar 1 in 43 and the selection signal SO. S1 is shown.

Table 2 Table 1 Name Selection signal QSO from image selection signal generation circuit 19. S1
are input to the AND circuit 20, and the herectludge circuit 21. The information is input to each of the 22 Ruri Gohans.

The output of the AND circuit 20 is output to the control terminal S of the select circuit 18 as a control signal. The select circuit 18 has input terminals A and B input with digital musical tone signals from the musical tone generation circuit 11, and when a control signal of ゛L'゜ is inputted into the control terminal, a manually generated musical tone is inputted into the input terminal B. The signal is output as is, and when a control signal of '1-bi' is input, the easy-to-see signal input to input terminal A is shifted to the right by 1 bit and output. In this case, ``O'' is added to the MSB, and the amplitude of the musical tone signal g is thereby reduced to 1/2.
This will be output as follows. The output from the select circuit 18 is sent to the select latch circuit 21. 22. The select latch circuit 21 is configured to latch and output a musical tone signal at the timing of the clock CLK inputted via the terminal 23 when the selection signal SO inputted to the control W terminal is llIll1. Similarly, the select latch circuit 22 is configured to latch and output the input musical tone signal at the timing of the clock CLK when the select signal S1 is input to the control end.Select latch circuit 21. 22 changes the latch output to amplitude O when the selection signals S0 and 81 of L I+ are input, respectively.
It is designed to output as follows.

For example, if the musical tone signal is an 8-bit digital value, this digital value can represent an amplitude of -128 to 128, and the select latch circuit 21. 22
"1 0 0 0 0 0 0 0" indicates the amplitude O when the selection signal SO, 31 of "L u" is input.
Output.

The D/A conversion circuit 24 inputs the digital musical tone signal from the Hirec latch circuit 21 and converts it into an analog {l'';'>
5 and applied to the left audio circuit 25. The D/A conversion circuit 26 receives the digital musical tone signal from the select 1/latch circuit 22, converts it into an analog signal, and outputs it to the right audio circuit 27.

Note that these select latch circuits 21. 22 and D
/A conversion circuit 24. 26 is clock C from terminal 23
It operates according to LK timing. Left and right audio circuits 25. 27 is a low frequency Hg (not shown)
It has a width circuit, a filter for frequency characteristic adjustment, etc., and outputs a musical tone signal to an output terminal 28. 29, respectively.

Next, the operation of the pseudo-stereo musical tone reproducing apparatus configured as described above will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a timing chart for explaining the output of the musical tone generation circuit 17 when reproducing eugic sounds of level A of teletext broadcasting, and FIG. 2(a) shows a digital musical tone signal, FIG. 2(b) shows the clock CLK.

FIG. 3 shows the select latch circuit 21. There is a timing chart +-'C to explain the operation of 22, and Fig. 3 (a
) shows the output of the select circuit 18, FIG. 3(b) shows the selection signal SO, FIG. 3(C) shows the selection signal MS1, and FIG. 3(d) shows the output of the select latch circuit 21. Figure 3(e) also shows the output of the select latch circuit 22.As mentioned above, at level 8 of teletext broadcasting, a song is composed of six melody parts and five rhythm parts. has been done.

The receiving circuit 2 demodulates the memorandum information from the signal induced in the antenna 1, and the error correction circuit 3 performs error correction, which is the same as in the past, and the MPU 16 stores the memorandum information in the main memory 'II 5. It is also the same as the conventional method to store .

Musical score information from the main storage device 5 is sequentially read out for each part and provided to the tone generation circuit 17. Then, the musical tone generation circuit 17 generates a digital musical tone signal for each part based on the input musical score information, and assigns it to the O to 10th channels at the timing of the clock CLκ shown in FIG. 2(b). Output in parts. On the other hand, the main storage device 5 provides information indicating that the melody bart has 6 parts and the rhythm bart has 5 parts to one sound @ selection signal generation circuit. As a result, the sound image selection signal generation circuit 19 outputs the selection signals 3o and 3i of "mouth" when the musical tone signal of the first channel V is outputted from the musical tone generation circuit 17. The output of the AND circuit 20 becomes "H++", and the select circuit 18 shifts the input musical tone signal to the right by 1 bit, compresses the amplitude to 172, and outputs it to the select latch circuits 21 and 22. Select 1 to latch circuit 21 ．．
Since the control terminals of 22 are all "11", as shown in FIGS. 3(a) to 3(e), the select latch circuit 2
1. From 22, the musical tone signal of the first melody bart is 1.
/2 and output (see data D in Figure 3)
. These musical tone signals are respectively sent to the D/A conversion circuit 24. 26
is converted into an analog signal in the audio circuit 25
．． Given to 27. Left and right audio circuits 25.
Since the levels of musical tone signals input to 27 are the same,
The first melody part is played in the center sound image.

The musical tone generation circuit 17 outputs the musical tone signal of the second melody version assigned to the channel of WI2 to the selection circuit 18 at the next clock C[κ. In this case, the sound image selection signal @ generation circuit 19 outputs the selection signal @SO of ``口゜'' and the selection signal S1 of ``shi''.
The output of 0 becomes "", and the select circuit 18 outputs the inputted musical tone signal as it is to the select latch circuits 21 and 22.The select latch circuit 21 outputs the selection signal SO as "" and the selection signal S1 as "['". '', the musical tone signal (data B) from the select circuit 18 is latched and output as shown in FIGS. 3(a) to (e).On the other hand,
The select latch circuit 22 outputs a digital value indicating an amplitude O, as shown in FIGS. 3(a) to (6).

The D/A conversion circuit 24 converts the musical tone signal from the select latch circuit 21 into analog and outputs it to the left audio circuit 25. On the other hand, the O/A conversion circuit 26 outputs an O-level signal to the right audio circuit 27 by converting the input digital signal into an analog signal.

Therefore, the musical tone signal of the second melody part is supplied only to the left audio circuit 25, and is reproduced in the left sound image.

Thereafter, in the same way, the musical tone signals of each channel are time-divisionally output from the musical tone generating circuit, and the sound image selection signal generating circuit 19 sequentially outputs the selection signals So, 81, thereby determining the sound image for each part. Table 3 below shows the sound image position of each part.

In this way, in this embodiment, the sound image positions of each part of the melody part and rhythm part are distributed so that the left and right balance is good, and it is possible to generate stereo sound that provides a sufficient three-dimensional effect. .

FIG. 4 is a block diagram showing another embodiment.

In FIG. 4, the same parts as in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.

In this embodiment, the output of the selector circuit 18 (Y/D/
The signal is applied to the A conversion circuit 30. D/A conversion same path 30
converts the digital tone signal from the select circuit 18 into an analog signal and sends it to the select latch circuit 31. It is output to 32. The select 1 and latch circuits 31 and 32 are controlled by selection signals So and 31, respectively, and the selection signals @30 .
When 31 becomes ``Tobi'', the musical tone signal from the D/A conversion circuit 30 is latched and output, and when the selection signal 80.81 of d L 11 is input, an output with an amplitude of O is output. Select latch circuit 31.3
The outputs of 2 are output to the left audio circuit 25 and the right audio circuit 26, respectively.

In the embodiment constructed in this way, musical tone signals are sent to the left and right select circuits 31 . Since the D/8 conversion circuit 30 is converted into an analog signal at the previous stage of the D/8 conversion circuit 30, it is sufficient to provide one system of the D/8 conversion circuit 30. Select circuit 31. 32 is selection signal 8
It is the same as in Fig. 1 that each part is controlled i2I1 by 0 and Sl, and the sound image of each part is distributed.
It is clear that effects similar to those of the illustrated embodiment can be obtained.

Note that the present invention is not limited to the above embodiments, but
For example, the method of dividing the musical tone signal of each part into left and right parts is not limited to the above-mentioned algorithm.

[Effects of the Invention] As explained above, according to the present invention, a sound image can be determined for each part using a predetermined algorithm.
It is possible to generate a musical tone signal that provides a sufficient three-dimensional effect without requiring user operations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a pseudo-stereo music reproduction device according to the present invention, FIGS. 2 and 3 are timing charts for explaining the embodiment, and FIG. FIG. 5 is a block diagram showing an embodiment of a musical sound reproduction device 1μ, FIG. 6 is a block diagram showing a conventional pseudo-stereo musical sound reproduction device, and FIG. FIG. 2 is a circuit diagram showing a typical configuration. 16...MPU, 17...Raku & generation circuit, 18...
- Selection circuit, 19... Sound image selection signal generation circuit, 21. 22... Select latch circuit, 24. 26
...D/A conversion circuit, 25...Left audio circuit, 27...Right audio circuit. Figure 2 Figure 3 Figure 5 Figure 1 Figure 4

Claims (1)

[Scope of Claims] A musical tone signal generating circuit that time-divisionally outputs musical tone signals based on digitally encoded musical score information for each part; a sound image selection signal generation circuit that outputs a second selection signal; and a first selection signal generation circuit that is controlled by the first selection signal and that holds and outputs the musical tone signal of the musical tone signal generation circuit or outputs a signal at a predetermined level. a signal holding means; a second signal holding means that is controlled by the second selection signal and holds and outputs the musical tone signal of the musical tone signal generation circuit or outputs a signal at a predetermined level; and the first signal. A pseudo stereo comprising: a first audio circuit that outputs sound based on the output of the holding means; and a second audio circuit that outputs sound based on the output of the second signal holding means. Musical sound playback device.