JPH0414796Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an automatic rhythm performance device that performs automatic rhythm performance by switching between a normal rhythm pattern and a special rhythm pattern.

[Prior art]

2. Description of the Related Art Conventionally, automatic rhythm performance devices have been put into practical use that perform automatic rhythm performance while switching between a normal rhythm pattern and a special rhythm pattern such as a fill-in (or intro). FIG. 1 shows an example of the circuit, and the rhythm sound source 1 is provided with a plurality of rhythm sound source circuits. A plurality of normal rhythm patterns and a plurality of fill-in rhythm patterns are stored in the rhythm pattern control circuit 2, and each desired rhythm pattern is read out by selecting an external switch and sent to the rhythm sound source circuit 1. supply is becoming available.
The rhythm sound source signal output from the rhythm sound source circuit 1 driven by the normal rhythm pattern is input to the normal rhythm mixing circuit 4, where it is mixed, and then outputted through a gate circuit 6, an amplifier, and a speaker (not shown). Ru. On the other hand, the rhythm sound source signal driven by the fill-in rhythm pattern and output from the rhythm sound source circuit 1 is input to the fill-in rhythm mixing circuit 5, mixed, and emitted as sound through the gate circuit 7, amplifier, and speaker. In addition to controlling the rhythm pattern control circuit 2 in accordance with the operation of the rhythm start/stop switch and the rhythm pattern selection switch, the control circuit 3 also controls the gate circuit 6 and gate circuit 7 in accordance with the operation of the fill-in switch. Control is performed to open either one, that is, the control signal G is applied directly to the gate circuit 6 and also to the gate circuit 7 via the inverter 8. This control signal G is output as a binary logic level "0" when the fill-in switch is turned on, and as "1" when it is turned off. Therefore, when the fill-in switch is turned on, the gate circuit 7 is opened and the fill-in is activated. A rhythm sound source signal of a rhythm pattern is output from the gate circuit 7, and on the other hand, when the gate circuit 6 is off, the gate circuit 6 is opened and a rhythm sound source signal of a normal rhythm pattern is output from the gate circuit 6.

[Problems with conventional technology]

FIG. 5 1 shows that when the fill-in switch is turned off, the control circuit 3 receives a "1" level signal.
FIG. 5 shows a normal rhythm control signal which is output from the rhythm pattern control circuit 2 and applied to the rhythm pattern control circuit 2. FIG. 2 shows a fill-in-rhythm control signal applied to FIG. 5. FIGS. 3 and 4 show an example of the output waveform of a normal rhythm pattern and the output waveform of a fill-in rhythm pattern output from the gate circuit 6 or the gate circuit 7, respectively. As can be seen from Figures 3 and 4 in Figure 5, when the fill-in switch is turned on and off, the output level of the normal rhythm pattern suddenly cuts off and drops to the "0" level, and at the same time the output level of the fill-in rhythm pattern The level of the fill-in suddenly rises, or conversely, the output level of the fill-in suddenly drops to the "0" level,
At the same time, the level of normal rhythm suddenly rises. As a result, when the fill-in switch is turned on or off, a ``chunk'' noise is generated, which is extremely difficult to hear.

[Purpose of invention]

It is an object of the present invention to enable switching from a normal pattern to a special pattern and from a special pattern to a normal pattern in a natural state without generating the noise.

[Key points of the idea]

In order to achieve the above-mentioned purpose, the present invention has developed two rhythm patterns in which level changes are mutually contradictory and are used to switch between a normal rhythm pattern and a special pattern.
A control means is provided for converting the signal level so that when one signal changes from a predetermined level to another level, the signal level is gradually changed in accordance with the passage of time, and a rhythm pattern is newly selected when switching rhythm patterns. The present invention is characterized in that the rhythm pattern is immediately output at a predetermined level, and the output level of the previously selected rhythm pattern is gradually lowered in response to the signal level from the control means.

[First Embodiment] The first embodiment will be described below with reference to FIGS. 2 to 5. FIG. 2 is a circuit diagram of the automatic rhythm performance device of this embodiment. Then rhythm sound source 1,
Rhythm pattern control circuit 2, control circuit 3, normal rhythm mixing circuit 4, fill-in rhythm mixing circuit 5, and gate circuits 6 and 7 have the same functions as each circuit in FIG. The same numbers will be given to the same numbers, and the details will be omitted. Further, 12 and 13 are an amplifier and a speaker, respectively.
Further, terminals T ₁ and T ₂ of the control circuit 3 are terminals to which the outputs of the rhythm start/stop switch and fill-in switch are input, respectively.

The signal A outputted from the control circuit 3 is the fill-in rhythm control signal shown in FIG. 52, and the signal B is the normal rhythm control signal shown in FIG. 51. The signals A and B are both input to the gate control waveform shaping circuit 11 and converted into gate control signals C and D, respectively, and applied to the gate circuit 7 or the gate circuit 6, respectively.

FIG. 3 shows a specific configuration of the gate control waveform shaping circuit 11. The configuration is the same for both full-in rhythm and normal rhythm, and as shown in the figure, a resistor r and a diode d are connected in series. R are connected in parallel, and a capacitor C whose one end is grounded is connected to its output side. The relationship between the resistance values of the resistors R and r is R>r.

Next, the operation will be explained. Prior to starting automatic rhythm performance, desired patterns for both normal rhythm and fill-in rhythm are specified by a switch. Then, when the rhythm start/stop switch is turned on, a rhythm start/stop signal of " ₁ " is input to terminal T1 of the control circuit 3.
In response to this, the normal rhythm rhythm pattern data specified for the rhythm pattern control circuit 2 is read out and supplied to the rhythm sound source 1. Therefore, each rhythm sound source driven by the rhythm pattern data outputs a rhythm sound source signal,
The signals are applied to the normal rhythm mixing circuit 4, mixed and applied to the gate circuit 6.

On the other hand, at the same time as the rhythm starts, the control circuit 3 outputs the signal B as shown in FIGS. 4-1 and 5-1.
It starts outputting at 1" level and supplies it to the gate control waveform shaping circuit 11. In this circuit 11,
Due to the relationship of resistance R>r, the signal A flows into the resistance r in a larger amount, is integrated with a small time constant due to r and c, and is output as the signal D. That is, as shown in FIG. 4, the signal D rises quickly but slightly later than the rise of the signal B, causing the gate circuit 6 to open. Note that since the signal C is "0", the gate circuit 7 is closed. Then, the mixed normal rhythm rhythm sound source signal is output from the circuit 4 through the opened gate circuit 6, and the amplifier 1
2. Sound will be emitted through the speaker 13.
FIG. 5 shows the output state of the rhythm sound source signal of normal rhythm.

On the other hand, when the fill-in switch is turned on, the terminal
A signal of "1" is input to _T2 , and the control circuit 3 reads out the specified fill-in rhythm pattern data in response to this and supplies it to the rhythm sound source 1. The rhythm sound source signal is output and input to the fill-in rhythm mixing circuit 5, and the mixing output is applied to the gate circuit 7.

On the other hand, when the fill-in switch is turned on, the control circuit 3 outputs the signal B as "0" and the signal A as "1" as shown in FIGS. 1 and 2 and FIGS. 5 and 1, respectively. The signal is applied to the control waveform shaping circuit 11. Therefore, in the circuit 11, the signal A is integrated by small time constants r and c in the fill-in side circuit, and outputted as a signal C to the gate circuit 7.
to open. That is, as shown in FIG. 4, the signal C rises slightly later than the signal A, and in response to this, the fill-in rhythm sound source signal from the fill-in rhythm mixing circuit 5 starts to be supplied to the amplifier 12, and the fill-in rhythm sound source signal starts to be supplied to the amplifier 12. The rhythm begins to be played. On the other hand, on the normal rhythm side of circuit 11,
Since the signal B becomes "0", the voltage that had been charged in the capacitor C starts discharging to the resistor R side, but due to the relationship R>r, the time constant RC becomes the time constant r,
c, and the discharge time is sufficiently long. That is, the waveform becomes as shown in FIG. 4, and its level slowly decreases to "0". For this reason, the normal rhythm is emitted for a while even after the fill-in switch is turned on, and gradually becomes inaudible. Figures 5 and 6 show the output waveforms. Therefore, when the fill-in switch is turned on and the rhythm is changed, the ``pop'' noise that conventionally occurs will not occur at all.

Next time you turn off the fill-in switch,
As is obvious from the above, the normal rhythm starts sounding instead of the fill-in rhythm, but in that case, as shown in Figures 4 and 5, the normal rhythm starts quickly, while the fill-in rhythm starts emitting sound. The rhythm gradually fades away. And the rhythm starts/
When the stop switch is then turned off, the normal rhythm is gradually muted, again preventing noise generation.

[Second Embodiment] FIG. 6 shows a stereo type automatic rhythm by providing two lines each of the normal rhythm mixing circuit 4 and gate circuit 6 shown in FIG. 2, the fill-in mixing circuit 5, and the gate circuit 7. This is a performance device, and in the figure, R is for the right side and L is for the left side of the suffix. The functions and configurations of the rhythm sound source 1, rhythm pattern control circuit 2, control circuit 3, and gate control waveform shaping circuit 11 are the same as those in FIG. Furthermore, since it is a stereo type, sound image localization and volume control for rhythm sounds are performed by a control circuit (not shown).
It is obvious that this embodiment also has the same effects as the first embodiment.

In the above embodiment, the automatic rhythm performance device is a stand-alone device, but it may be incorporated into an electronic musical instrument. Further, the configuration of the gate control waveform shaping circuit is not limited to the above embodiment.

[Effect of idea]

As explained above, in order to switch between a normal rhythm pattern and a special pattern, when two signals whose level changes contradict each other change from a predetermined level to another level, the signal level is adjusted over time. The newly selected rhythm pattern is immediately outputted at a predetermined level when the rhythm pattern is switched, and the previously selected rhythm pattern is output as a signal from the control means. The output level is gradually reduced in response to the level, so
No noise occurs when switching rhythm patterns,
It has the advantage of being switched in a natural state.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional automatic rhythm performance device.
FIG. 2 is a circuit diagram of the automatic rhythm performance device of the first embodiment, FIG. 3 is a detailed circuit diagram of the gate control waveform shaping circuit 11, FIGS. 4 and 5 are waveform diagrams explaining the operation, and FIG. 1 is a circuit diagram of an automatic rhythm performance device according to a second embodiment. 1... Rhythm sound source, 2... Rhythm pattern control circuit, 3... Control circuit, 4, 4R, 4L... Normal rhythm mixing circuit, 5, 5R, 5L...
Fill-in rhythm mixing circuit, 6, 6R, 6
L, 7, 7R, 7L...gate circuit, 11...gate control waveform shaping circuit.

Claims (1)

[Claims for Utility Model Registration] A pattern output means for outputting a normal rhythm pattern and a special pattern; A switching signal output means for outputting two signals whose level changes are mutually contradictory; and a signal from the switching signal output means. selecting means for selectively outputting the normal rhythm pattern when one of the signals reaches a predetermined level, and selectively outputting the special pattern when the other signal reaches a predetermined level; Upon receiving the two signals from the switching signal generating means, when one of the two signals changes from the predetermined level to the other level, the level of the changed signal is changed from the predetermined level to the other level. control means is provided for outputting the two signals gradually changed to the other level in accordance with the progress of the switching signal generation means, and outputting the two signals from the switching signal generation means as they are at other times; Upon receiving two signals from the means, when one of the two signals gradually changes from the predetermined level to the other level, the pattern output means responds in conjunction with this signal change. gradually changing the output level of the rhythm sound generated based on the rhythm pattern, and changing the rhythm pattern corresponding to the other signal in conjunction with the other signal that rapidly changes from the other level to the predetermined level. 1. An automatic rhythm performance device characterized in that the output level of a rhythm sound generated based on the rhythm sound is immediately raised to a predetermined level.