JPS6032878B2 - automatic accompaniment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic accompaniment device that is controlled in a time-sharing manner, and more specifically, the present invention relates to an automatic accompaniment device that is controlled in a time-sharing manner, and more specifically, a pitch name signal of binary words corresponding to each pitch name of an accompaniment key and a foot key is sequentially transmitted. A decoder is connected to the note name signal generator, which assigns the timing signal output from the decoder to the note name of the accompaniment key and foot key. The present invention relates to an automatic accompaniment device that detects in a time division manner and controls an automatic accompaniment circuit.

An automatic accompaniment device that has a function that automatically creates rhythmic accompaniment with chords and bass notes by simply pressing one key on the accompaniment keyboard, or automatically creates accompaniment with the chords pressed on the accompaniment keyboard and the matching bass note. Various types have already been developed.

By the way, as the functions to be provided in such devices become more diverse and sophisticated, the circuit configuration naturally becomes more complex. ``It is essential to integrate the main circuit blocks into one.Generally, during mass production, the price of BI depends on the price of the package, that is, the number of pins, so automatic accompaniment of the circuit configuration suitable for LSI is required. It is necessary to develop a device.The present invention was made in view of the above circumstances, and its purpose is to minimize the number of control lines and facilitate integration by adopting a time division method. An object of the present invention is to provide an automatic accompaniment device having a circuit configuration.

The present invention will be explained in detail below based on the drawings.

FIG. 1 is a block diagram of an embodiment of an automatic accompaniment device according to the present invention, and the device is configured with an automatic accompaniment circuit 1 at its center and external circuits connected to it. The details of the automatic accompaniment circuit 1 are shown in FIG. I will explain the outline of the counterfeit. First, a clock pulse CLK (see FIG. 5) is supplied from the clock pulse generating circuit 2 to the automatic accompaniment program 1. Then, the timing signal T,,, is applied to the terminals, t2,..., shi3.
T2,...,T,3 occurs (see Figures 6 and 8),
V is supplied to the foot key circuit 3 and accompaniment key circuit board 4, respectively. The foot key circuit 3 has 13 foot keyboard on/off switches for specifying bass note names, and the foot key note names are assigned to the timing signals as shown in Table 1.

Table 1 Also, the accompaniment key circuit 4 has a switch that is turned on and off on the accompaniment keyboard to specify a chord (chord) for automatic accompaniment, and the note names of the accompaniment keys are assigned to the timing signals in Table 2. ing.

Table 2 The timing signals T, , T2, ... specified by the foot key circuit 3 and the accompaniment key circuit 4 are each input by the OR circuits 5 and 6.
The signals are collected into a main control line and guided to the ik terminal and ip terminal of the automatic accompaniment circuit 1, respectively.

The code detection result of the accompaniment key designation signal IK to the ik terminal is
A binary signal (code type designation signal) as shown in Table 3-1 is taken out from each terminal of ch-1, ch-2, and ch-3. Accompaniment key designation signal IK for C chord
An example of code type assignment is shown in Table 3-2. Third
Table 3-2 Here, symbol 1 indicates the divine key state, and blank indicates the key release state.

Further, in the case of an accompaniment key designation signal IK other than those shown in Table 3-2, it becomes a random key ER. These chord type designation signals are supplied to the base pattern designation circuit 7, and together with the rhythm designation signal generated from the rhythm selection circuit 8', the rhythm name (waltz, rumba, etc.) and the chord type (major, minor, etc.) are specified. Select memory information. Then, the rhythm pulse generation circuit 8
The stored information, that is, the 4-bit/inary frequency signal specifying the bass pattern for automatic bass accompaniment is read out in accordance with the timing signal generated by the bass accompaniment. An example of this is shown in the fourth
Shown in the table. In addition, the ib terminal in Table 4 has a signal for switching the auto bass sound from major to minor or major to seventh, which will be described later, and a signal for switching from major to minor or major to seventh for the auto chord note name designation signal ACC, which will also be described later. signal, and an octave signal are added.

The Mss terminal of the automatic accompaniment circuit 1 outputs a bass blue signal or an auto bass sound signal of the pitch name designated by the foot key designation signal IP.

To switch between the foot key base sound signal and the auto base green signal,
This is done using the attack signal ATK. When the foot keys are prioritized and there is no FOOT signal, the tone is switched to the auto bass sound in synchronization with the front green of the ATK signal, as shown in FIG. 9. In addition, the bass pattern specifying circuit 7 generates an attack signal ATK for switching to automatic bass accompaniment that automatically generates a bass tone corresponding to the chord. 4-bit frequency signals B, , B2, B4, & specifying subordinate tones of the auto bass sound sent from the bass pattern specifying circuit 7, and a one-finger control circuit used when playing the electronic organ in one-finger mode. Various control signals from the octave control circuit 9 and control signals for octave control of the bass sound output from the octave control circuit 10 are applied to the multiplexer 11, and the multiplexer 11 outputs the timing signals T,,L,...,T, o is converted into a time-division signal and applied to the ib terminal of the automatic accompaniment circuit 1 via one control line. Here, the frequency signal B, string, B4
, horses are assigned as shown in Table 5 with a 4-bit binary serial timing signal. As shown in Table 5, when a plurality of foot keys are pressed at the same time, the bass note of the note name of the lowest note is output.

This auto bass sound is created by adding the auto bass pitch name designation signal IB applied to the ib terminal and the root note of the detection code, and
This is the pitch name output after the three-tone correction.

Further, from the acc terminal of the automatic accompaniment circuit 1, an autochord pitch name designation signal ACC for autochord accompaniment is outputted as a serial timing signal. The truth tables for the ACC signal are shown in Tables 6-1, 6-2, and 6-3. Table 6-1 is the major chord/strategy key, Table 6-2 is the diminished chord, Table 6-3 is the minor, seventh,
The augment codes are shown, with code 1 being a high level and blank being a low level. In the case of the C major chord, FIG. 10 shows the relationship between the autochord pitch name designation signal ACC and the timing signals T, . . . , T, 3. Table 6-11 Table 6-2 Table 6-3 Such an autocode pitch name designation signal is supplied to the demultiplexer 12, where timing signals T,,...,T
, 2, the timing is broken and 12 autocode sounds (
C, C#, . . . , B).

This parallel DC signal is sent to the chord tone generation circuit 13 and generates an autochord tone specified by the autochord tone name signal, but this autochord tone is generated by the rhythm pulse generation circuit 8.
The timing is determined by the rhythm timing signal sent from the automatic chord accompaniment tone. The rhythm timing of the signal BASS from the field ss terminal is determined by the ATK signal sent from the base pattern specifying circuit 7 in the timing gate circuit 14.

The memory switch circuit 15 is a circuit that controls the memory operation, that is, the operation that continues the automatic accompaniment even if the accompaniment key is released, and continues to output the specified bass tone even if the foot key is released. A control gate circuit 16 controls passage or non-passage of the KEY signal sent from the terminal at ke. This K
The EY signal is L2 of the serial timing signal T that indicates whether the accompaniment key and the foot key are in the pressed or released state.
It is. Reference numeral 17 denotes a demultiplexer, which forms the tone of the code blue signal and the BASS signal in a tone color synthesis circuit 18, and supplies it to two amplifiers together with a rhythm signal from a rhythm tone generator circuit 19, thereby driving a speaker 21. next,
How output signals corresponding to the input signals are formed and output based on various input signals supplied to the automatic accompaniment circuit 1 will be explained with reference to the circuit diagram shown in FIG. 2.

The clock signal from the clock pulse generation circuit 2 described above is applied to various timing signals 73, 5, and 73 in the automatic accompaniment circuit 1.
The timing signal generating circuit 30 converts the signals into 3, 10, 4, 175, 5, 10, . . . , 178 (see FIG. 5), and these timing signals are supplied to various circuits. The accompaniment key designation signal IK is waveform-shaped by the timing pulse waveform shaping circuit 31 and sent to the chord detection circuit 32, where it is converted into 3-bit pinary code signals CHI, CH2, CH as described above.
3 is detected and sent to the code storage circuit 37 for storage, and the code detection circuit 32 generates a code matching pulse signal ACRD, which is sent to the chord/root note write pulse generation circuit 33. Furthermore, the ALL-OFF signal, which detects that none of the accompaniment keys are pressed, is sent to the accompaniment key ALL-OFF.
The signal is sent to the OFF signal generation circuit 34. A change in the pressing of the accompaniment key is detected by the key change output circuit 35, and its output controls the waiting time generation circuit 36, thereby turning on the accompaniment key,
When the key changes to OFF, the operation of the chord/root note writing pulse generation circuit 33 is stopped for a certain period of time to prevent malfunction of chord detection. The code signals CHI, CH2, CH3 are directly output from the code terminal, while the decoder 38 outputs a code type signal (major, minor,...) and a keystroke signal E.
Decoded to R.

Then, in the ACC-m, sh control circuit 39, the m
(mina), converted to hole h (seventh). but,
When the ACC1m and ACC-hh control signals are not applied, the output of the decoder 38 is directly supplied to the ACC signal generation circuit 40, and the auto bass accompaniment note name designation signal AC is supplied.
Generate C. In addition, the foot key designation signal IP is shaped by a timing pulse waveform shaping circuit 41 and is then shaped by a foot key note name detection circuit 4.
2, it generates a pitch name detection pulse PED-P signal that detects the pitch name of the foot key, and also generates a foot key press signal FOO.
The foot key press signal FOOT is sent to the foot key/auto base switching signal generating circuit 43 to the ATK pulse generating circuit 4.
It is combined with the ATK-P signal supplied from V 4 to generate a PEDAL signal for switching between normal foot key performance and auto bass accompaniment.

When the ATK-P signal is applied when there is no foot key press signal sent from the foot key note name detection circuit 42, the accompaniment is switched to auto bass accompaniment. These are time-divided by the multiplexer 50 using the timing signal L, circle 2, and the PEDAL-ON signal indicating that the foot key is pressed and the MANU-ON signal indicating that the accompaniment key is pressed are KEY. It is output as a signal from the ke power terminal. Next, the pitch name signal generator 51 generates a table 7 corresponding to the 12 pitch names CL, C#, ..., B of the accompaniment keys and the $1 pitch names CL, C#, ..., CH of the foot keys. Pitch name signals of binary words such as N8, N4, N2
,N, is generated.

FIG. 3 shows an example of a specific circuit of the pitch name signal generator 51 shown in Table 7.
Flip flops 64a, 64b, 64c, 64d and 1
Equipped with a flip-flop 65 with set and reset,
The Ta terminal of the first stage toggle flip-flop 64a is connected to the signal generated by the timing signal generation circuit 3.
A 1-8 signal (see FIG. 5) is supplied.

Qa, Qb on the output side. ...The terminals are Th on the input side of the next-stage toggle flip-flops 64b, 64c, and 64d,
In addition to being connected to the Tc and Td terminals, it is also connected to a ROM circuit 66, and the output of the ROM circuit 66 is sent to each toggle/flip flop via a flip-flop 65 with set/reset. It is applied to the reset terminals of the chips 64a, . . . , 64d to perform hexadecimal operation. Therefore, the pitch name signals N, , N2, N4, N5 in binary words shown in Table 7 and FIG. 11 are outputted to the output side of the pitch name signal generator 51. Further, the flip-flop with set/reset 65 is supplied with the signal shown in FIG. 11 at its S terminal, and generates the S-CLK signal from its Q terminal. Pitch name signals representing each of these pitch names are sent to the decoder 5.
2, the corresponding timing signals To, , T2,
..., To, 3 (see Figure 6).

A specific circuit example of this decoder 52 is shown in FIG. Fourth
In the figure, the decoder 52 is composed of a ROM circuit 67, and the pitch name signals N,, N2, N4, N8 are stored in the vertical ROM line.
is input, and a timing signal T is input from the horizontal ROM line.
,...,To,3 are output. This output is a timing signal T, whose width is narrowed by the timing signal of the waveform shaping circuit 53.
..., T, 3 (see Figure 8), t,,...,t
, and three terminals to control the external circuit in a time-division manner. Also, the S-C generated from the pitch name signal generator 51
The LK signal (see FIG. 6) is generated by the sequence signal generation circuit 54.
A sequence signal S. which is supplied to S. and controls various circuits in a time-division manner. , S3, and S4 (see FIG. 7).

Furthermore, various control signals inputted from the ib terminal are converted from serial signals to parallel signals by a demultiplexer 55, and become various DC signals. Among these, the 4-bit binary signal -, 14, 12, 1, output is BASS-1m,
When the BASS-m control signal is applied to the 9h control circuit 56, the major third signal is converted to a minor third signal, and the BASS-hh
When a control signal is applied, a perfect fifth signal is converted to a minor seventh signal. These 4-bit binary frequency signals are combined with an adder circuit 57 and outputted from an accompaniment key tone name storage circuit 58.
It is added to the bit binary root tone signal to perform scale correction. Here, the accompaniment key pitch name storage circuit 58 latches the 4-bit pitch name signal from the pitch name signal generator 51 at the timing of the ACD-P signal generated by the accompaniment key depression signal lx, and stores the root note. It is something. Further, the foot key/auto base switching circuit 59 selects the binary signal from the adding circuit 57 or the foot key note name storage circuit 60 using the PEDAL signal and sends it to the $1 correction circuit 61.

This foot key pitch name memory circuit 60 also has four parts of the pitch name signal generator 51.
The pitch name signal of the bit is latched by the PED-P signal generated by the key press signal IP of the foot key, and the root note is stored. In the $1 ship correction circuit 61, the addition circuit 57
When the value added exceeds the digital value corresponding to the bass note name CH, it is corrected to the digital value of the corresponding bass note name, and OCTAV controls the bass blue octave.
The E signal is sent to the octave switching circuit 62.

The 4-bit binary pitch name signals B, B, K, & from the 13-band correction circuit 61 that specifies the bass pitch name are sent to the decoder 63.
After being converted into a DC signal specifying the bass note name, the bass note generating circuit 64 generates the specified bass note name CL, C#,
..., generates a CM bass blue signal, passes through the octave switching circuit 62, and outputs the bass sound signal BASS from the bass terminal.
Output. In this way, automatic accompaniment is performed by the automatic accompaniment circuit and the peripheral circuits connected to it.

That is, a pitch name signal of binary information from the pitch name signal generator 61 is sent to the accompaniment key pitch name storage circuit 58 and the foot key pitch name storage circuit 601, and is converted into a timing signal by the decoder 52, and this timing signal is sent back to the automatic accompaniment circuit 1 via one control line in time division as key press signals for accompaniment keys and foot keys, and the type of chord and root note are detected and stored depending on the timing, and frequency signals and various The control signal is also time-divided and sent to the automatic accompaniment circuit 1 through one control line, and the autochord pitch name designation signal is also output from the automatic accompaniment circuit 1 as a serial signal, which is converted into a parallel signal by the demultiplexer 12. There is. The present invention is an automatic accompaniment device configured as described above,
Since the automatic accompaniment circuit is controlled in a time-sharing manner,
The number of control lines can be reduced, and the automatic accompaniment circuit can be easily integrated.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of an automatic accompaniment system according to the present invention, FIG. 2 is a block diagram of an automatic accompaniment circuit of the device shown in FIG. 1, and FIG. 3 is a circuit diagram of an example of a pitch name signal generator. , Fig. 4 is a circuit diagram of an example of a decoder, Fig. 5 is a timing chart of input/output signals of the timing signal generation circuit, Fig. 6 is a timing chart of input/output signals of the note name signal generator and decoder, and Fig. 7 8 is a timing chart of the output signal of the sequence signal generation circuit, FIG. 8 is a timing chart of input/output signals of the waveform shaping circuit, FIG. 9 is an explanatory diagram of the operation of the foot key/auto base cutting signal generation circuit, and FIG. 10 11 is a diagram showing the relationship between the ACC signal and the timing signal, and FIG. 11 is a timing chart of input and output signals of the pitch name signal generator. 1... Automatic accompaniment circuit, 132... Chord detection circuit, 37
. . . Code storage circuit, 51 . . . Pitch name signal generator, 52 . . . Decoder. Figure 1 Figure N Sphere Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1 It has an accompaniment keyboard and a pedal keyboard, and detects the root note and chord type of the chord as an automatic base chord using binary information based on key press information played on the accompaniment keyboard, and also detects the chord root note and chord type as an automatic bass chord using binary information. Detecting key information as a foot key code in a binary signal, selecting either the automatic bass code or the foot key code and supplying it to a bass sound generation circuit, and generating a bass sound from the base sound generation circuit. In the automatic accompaniment device, a pitch name signal generator sequentially and cyclically generates binary information (binary words) corresponding to each pitch name C_L to C_H on the keyboard, and the binary information is converted into a timing signal by a conversion circuit. converting the timing signal into the accompaniment keyboard, and supplying the OR output to a chord detection circuit that detects the root note of the specified chord and the type of the chord, while guiding the timing signal to the foot keyboard. , an automatic accompaniment device characterized in that the OR output thereof is supplied to a footnote note detection circuit that specifies a bass note.