JPS6261095A - Overdabbing unit for electronic musical apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an electronic musical instrument that converts an externally input acoustic signal into a digital signal, uses it as a sound source signal, and generates sound at an arbitrary scale frequency. In particular, the present invention relates to an overdubbing device for an electronic musical instrument having an overdubbing function capable of superimposing several pre-recorded audio signals and digitally recording them again as a sound source signal.

[Background of the invention]

Conventionally, the lateral dorsal signal is called PCM (Pulse Co
Various methods have been used to digitally record data using various modulation methods such as dedModulation and use it as a sound source signal for, for example, a keyboard instrument.

The applicant filed a patent application for the invention disclosing such technology in 1973.
No. 9-167119 and Japanese Patent Application No. 167120-1982.

By the way, various devices called sampling machines have been developed today, and some of them are commercially available.
Some devices of this kind are equipped with an overdubbing function, which overlaps several pre-recorded audio signals as described above and digitally records them again as a sound source signal, but none of them have any drawbacks. It is insufficient for practical use.

[Purpose of the invention]

The present invention has been made in view of one or more points, and an object of the present invention is to provide an overdubbing device for an electronic musical instrument that is simple, easy to operate, and musically satisfying.

[Key points of the invention]

The present invention has been made to achieve the above-mentioned object, and uses at least two of a plurality of waveform read/write channels.

A plurality of digital signals are read out from the waveform memory, and after variably controlling the timbre, volume, etc. of the read out digital signals, they are synthesized and digitally recorded again in the waveform memory, and further, the above-mentioned signals are transmitted through the at least two channels. The main point is that a display is provided to instruct a plurality of digital signals to be read out from the waveform memory, and a display is provided to instruct the content of processing for variable control of the tone color, volume, etc.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 shows the circuit configuration of this embodiment, and shows the input signal (
IN) is suitably amplified by an input amplifier 1 and then supplied to an analog adder circuit 2.

Thereafter, after being sampled at an appropriate sampling frequency in the sample/hold circuit (S/H) 5, the A
/D converter 6. The A/D converter 6 converts the input analog signal into a corresponding digital signal and supplies it to the sound generation control section 8.

This sound generation control section 8 includes, for example, four waveform read/write channels, each of which can independently write or read waveform signals into or from the waveform memory 7. This sound generation control section 8
The specific structure is described in the above-mentioned Japanese Patent Application No. 167119/1982, so detailed explanation thereof will be omitted.

This sound generation control section 8 operates based on the control from a CPU 9 consisting of a microcomputer, etc., and corresponds to the four waveform read/write channels of this sound generation control section 8, so that a maximum of 4 A digital signal corresponding to the sound is read out from the waveform memory 7, applied to the D/A converter 10 in a time division manner, and then supplied to sample and hold circuits (S/H) 11a to 11d. .

These sample and hold circuits 11a-lid.

By timing signals t1 to t4 as described below.

A sampling operation is performed for each time-division processing channel time.

The voltage signals held in the sample-and-hold circuits 11a-lid are supplied to VCFs (' is a pressure-controlled filter) 12a-12d in a corresponding manner. The respective VCFs 12a to 12dlC are supplied with voltage signals FCVI to FCV4, which will be described later, and the voltage signals FCV
Filtering processing is performed independently according to I to FCV4.

The VCFs 12a to 12d send filtered analog waveform signals to VCAs (voltage controlled amplifiers) 13a to 13d.

The amplification factors of the VCAs 13a to 13d are independently controlled by the supplied control voltage signals ACVI to ACV4, and the output level or volume envelope of the waveform signals supplied from the VCFs 12a to 12d is determined.

The output signals of the VCAs 13a to 13d are sent out to the outside as outputs 0UT1 to 0UT4 of each channel, respectively, and after being amplified appropriately, are emitted as sound signals. Further, the outputs of the VCAs 13a to 13d are supplied to an analog adder circuit 14, mixed, and can be outputted to the outside as a mixed output OUTMIX.

is supplied to the analog switch 15 which performs a switching operation according to the control signal from the CPU 9 mentioned above.

This analog switch 15 connects the output of the VCF 12d,
The output of the analog adder circuit 14 is selected and supplied to a VCA (voltage controlled amplifier) 16.

The VCA 16 amplifies the supplied control voltage signal ACvO and feeds it back to the analog adder circuit 2 described above.

Therefore, the external sound signal supplied via the input amplifier 1,
The waveform signal obtained by reading out the waveform memory 7 can be mixed by the analog adder circuit 2 and supplied to the waveform memory 7 again.

Reference numeral 4 in the drawing denotes a keyboard/display unit consisting of a keyboard having performance and various control switches, and a liquid crystal display panel for displaying various statuses.

The CPU 9 and this keyboard/display section 4 exchange data.

FIG. 2 shows the configuration of the main parts of this keyboard/display section 4.1 Tone switches 41-44 for specifying, for example, four tone numbers, and tone switches 41-44, respectively.
LE that instructs and displays the tone number by selective operation etc.
Display elements 41a to 44a made of D are provided.

Further, in FIG. 2, reference numeral 45 is a record switch, and the display element 45a lights up in response to its operation. Further, reference numeral 46 is an overdubbing switch for specifying an overdubbing mode, and the display element 46a lights up in response to its operation. Also, code 47
1 is a trigger switch that applies manual trigger power, and the display element 47a lights up and displays in response to its operation. The operating procedures of the switches 45 to 47 will be described later.

Further, as described above, the keyboard/display section 4 includes a display device 48 consisting of a liquid crystal dot matrix display panel, which displays characters such as the operation status of each switch and the operation mode status. FIG. 2 shows an example of a display in a certain operating state, and the meaning thereof will be described later.

In addition, in FIG. 1, the CPU 9 uses software processing to input each of the control signals FCV1 to FCV4°ACVI.
~ACV4. In order to generate one ACVO (hereinafter collectively referred to as control signal C), a digital signal is supplied to the D/A converter group 17 and converted into each voltage signal.

This D/A converter group 17 may have a number of D/A converters corresponding to the number of control signals C, or one D/A converter may be used in a time-sharing manner. , in combination with a sample-and-hold circuit.

A required number of control signals C■ may be obtained.

Next, the operation of this embodiment will be explained. FIG. 3 shows the time-division processing state of multiple channels of one sound generation control section 8, and the sample/hold circuits 11a to 11lid have shape read/write channels realized in a time-division configuration, and each waveform read/write channel Each time, read (read) processing or write (
-jPite) processing can be specified selectively, and in the state shown in Figure 3, channel 1 (
filter 3 is stored in the waveform memory 7 through the processing of
．． Sample/hold circuit5. The waveform signal obtained via the A/D converter 6 is written.

The other channels 2 to 4 (ch2 to 4) are capable of reading digital waveform signals in predetermined areas from the waveform memory 7.

Further, the above-mentioned timing signals t, to t4 are set such that the analog waveform signals outputted from the D/A converter 10 are sampled by the sample and hold circuits 11a to 11lid at each channel time, and thereafter held.

FIG. 4 shows how the waveform memory 7 is divided into areas, so that, for example, N pieces of waveform information can be recorded in variable lengths. Each waveform read/write channel of the sound generation control section 8 is arranged in a K format so that the area to be read/written can be specified independently.For example, for channels 2, 3, and 4,
Figure 4 17)) -yl, 2.3 to R1B1. , it is vCF12b-12d.

Processing is controlled by the VCAs 13b to 13dlC, and the signals are supplied to the analog adder 2 via the analog adder circuit 14, switch 15, and VCAI 6. After being mixed with external sound signals as necessary, the signal is sent to the sample/hold circuit 5 and A/D input through converter 6 and processed by channel 1,
tone Ni and record it in the waveform memory 7 again. That is, it is also possible to perform overdubbing processing.

Further, the CPU 9 sends a switching signal to the analog switch 15 so that the waveform signal read out from the waveform memory 7 by the processing of the channel 4 is further applied to the VCAI 6 via the sample/hold circuit 11d and the VCF 12d. and the waveform signal obtained by K in this way is
It is also possible to supply the signal to the analog adder 2, mix it with the external sound signal in the same manner as described above, and then write it into a predetermined area of the waveform memory 7.

Next, with reference to chart 70 in FIG. 85, processing mainly performed by the CPU 9 in the overdubbing mode will be described in detail.

Overdubbing switch 46 on keychain/display section 4
When the CPU 9 is designated to the overdubbing mode by the switch operation, first, step K is performed to determine which waveform signal already stored in the waveform memory 7 is to be read out in association with which scale frequency. In step S, it is judged whether or not a keyboard operation or a switch operation on the keyboard/display section 4 has been performed.

The waveform signal recorded in the waveform memory 7 will be output from the waveform memory 7 at a high readout rate if a high range scale is specified, and if a low range scale is specified. , will be output from the waveform memory 7 at a low readout rate.

If there is a key input in this step S, a YES determination is made and the process moves to step S. Step S.

Then, the CPU 9 stores the number of the tone to be read from the waveform memory 7 specified on the keyboard/display section 4 together with the scale specified by the key operation. Also,
The CPU 9 stores information that determines the corresponding volume. Then, the process moves to step S3.

That is, after the tone switch 42 that designates tone 2 is operated and the corresponding display element 42a is made to blink, the C and + keys are operated on the keyboard, and then the numeric keypad or slide switch is pressed. Set the volume to level "56" on the input device.

In this state, in step S, the tone number is indicated and displayed on the display element 42a, and the display device 48 clearly indicates that the scale is C8 and the volume is at level 56. FIG. 2 shows the display form in such a state.

Next, the process moves to step S4, and if the trigger switch 47 is not operated, the process returns to step S1 again. Similarly, if the user operates the tone switch 43 to designate 1, for example, tone 3, operates a key on the keyboard C4, and sets the volume to 50, the same display as above will be made in the processing of steps St and S.

At this time, for example, when the same tone number is designated and a different scale is designated using the keyboard, the display elements 41a to 44a and the display device 48 display a display to that effect.

Finally, the tone number to be recorded is specified by combining the digital signals already input and stored and, if necessary, an external input signal. In other words, if, for example, the tone switch 44 is operated while operating the record switch 45, in the above example, the tone 2 will be changed to the scale Cs.
The tone is played back at a volume level of 50 on the + scale, and both waveform signals are combined and recorded in the waveform memory 7 as tone 4. Note that when the record switch 45 is operated, the display elements 42a and 43a are lit, and the display element 44a is blinking, indicating the tone number of the sound to be reproduced and the tone number of the sound obtained by recording. is clearly stated.

Even if the determination of No is made in step S,
Proceed to step S4 above. Step S4 is a step of determining whether a trigger number 1'iE for actually starting recording has been supplied from the keyboard/display unit 4.
If not applied yet, S again.

Return to step S, -+S, or step S below.

→S, →S, →S4 are repeated to enter the standby state.

Therefore, as mentioned above, when multiple keys are operated on one board, up to three scales can be assigned to channels 2, 3, and 4, and if different tone numbers are specified for each, , if waveform signals of different tones are played at specified scales and the same tone number is specified for each channel, the waveform signals of the same tone will be played at different specified scales and overlapping with different volumes. It will be dubbed.

In the above step S4, if there is a manual trigger force using the trigger switch 47, a determination of Yes is made and the process moves to step S. Incidentally, in step S4, when the input signal (IN) exceeds a predetermined level, a trigger may be automatically given to the manually operated CPU 9, and the process may proceed to step S.

In step S, the tone number saved by the CPU 9,
The scale information is supplied to the sound generation control section 8, and the area of waveform data to be read from the waveform memory 7 is specified for each waveform read/write channel, and the scale thereof is specified.

Next, proceeding to step S, the CPU 9 generates control signals 13a to 13 for the D/A converter group 17 in accordance with the levels input and set on the keyboard/display section 4.
d. Supply each control signal Cv to the VCA 16.

Further, the CPU 9 gives a switching signal to the analog switch 15, and transfers the mixed waveform signal from the adder circuit 14 to the VCA.
16. Then proceed to step S, using channel 1.

The CPU 9 starts actual recording. At this time.

A designated channel among channels 2 to 4 operates to generate a predetermined acoustic signal by reading waveform data from the waveform memory 7, respectively.

Then, when the input processing is completed, it becomes the end state and C
The PU 9 returns to the processing of the main routine (not shown).

As described above, in this embodiment, the four waveform read/write channels of the sound generation control unit 8 are configured to independently read and write waveform signals, and at least two channels are used to read and write waveform signals in the waveform memory. or a separate digital signal from the VCF 12a-1.
2d and VCA13a to 13d independently control the timbre and volume, mix it, and process it into the waveform memory 7 using a specific channel as a new sound source signal, which enhances the overdubbing function. This makes it possible to measure the music, and it is also desirable from a musical perspective.

Also, using up to three of the four waveform read/write channels, waveform data is read from the waveform memory 7, and if necessary, this reproduced waveform data and the input waveform signal (IN') are synthesized. Since the sound source waveform data can be converted into sound source waveform data, overdubbing can be done in various ways.

In addition, by dividing the waveform memory 7 into multiple areas and using it, it is possible to write the waveform signal obtained as a result of overdubbing to an area different from the area where the original waveform signal is recorded, and the original waveform signal It becomes possible to overdub without erasing the data.

In addition, V
The volume level can be set independently using the CAs 13a to 13d.

Furthermore, it is also possible to read the same waveform data from the same memory area at different scale frequencies using a plurality of waveform read/write channels, and to synthesize it using the VCAs 13a to 13cl while varying the synthesis ratio.

Furthermore, in the above embodiment, one display element 41a to 44a
Since the tone number, scale, and volume are displayed using the display device 148, overdubbing processing can be performed efficiently and operability can be improved.

In addition, in the embodiment described above, the VCFs 12a to 12
d. Although the timbre and volume are variably controlled by VCAs 13a to 13d, it is also possible to variably control the timbre, volume, envelope, etc. using a digital filter, digital multiplier, etc. . Also,
Other processing may be applied to the waveform signal.

In addition, the circuit configuration of the sound generation control unit 80 is different from configuring a plurality of waveform read/write channels by time-sharing processing as in the above embodiment, to using separate hardware, that is, the same circuit configuration for the number of channels. A plurality of waveform read/write channels may be provided by using a plurality of waveform read/write channels.

Furthermore, a specific channel among multiple channels,
A write-only channel may be used to write the waveform signal into the waveform memory 7, and other channels may be used as read-only channels to read the waveform signal from the waveform memory 7. The "waveform read/write channel" in the present invention f means a channel that allows only one or both of read and write operations.

Further, in the above embodiment, the tone number of the sound to be overdubbed is displayed on display elements 41a to 4 which are separate from the display device 48.
4a, but all such information may be displayed on a single display device.

Furthermore, in the above embodiment, only the volume was displayed, and the display related to the timbre, such as the cutoff frequency of the filter, etc. was not displayed, but what kind of timbre control would be achieved if this was also done? This is understandable and convenient.

〔Effect of the invention〕

As mentioned above, this invention is simple, has good operability,
It is possible to provide an overdubbing device for an electronic musical instrument that is musically preferable.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a circuit configuration diagram thereof, Fig. 2 is a diagram showing the main parts of the keyboard and display section, and Fig. 3 is a time diagram for explaining the operation of the embodiment. FIG. 4 is a diagram showing the storage state of the waveform memory, and FIG. 5 is a diagram showing a flowchart for explaining the operation of the embodiment. 2... Analog addition circuit, 4... Keyboard/display section, 6... A/D converter, 7... Waveform memory, 8...
. . . Sound generation control unit, 9 . . CPU, 10 . . . D/A converter. 12a-12d...■CF, 13a-13d...V
CA, 14...analog addition circuit, 17...D/A
Converter group, 41a to 44a...Display element, 48...
Display device.

Claims (5)

[Claims] (1) In an electronic musical instrument that converts a waveform signal into a digital signal and records it in a waveform memory, and converts and outputs the digital signal recorded in the waveform memory into an acoustic signal with a specified frequency, it is possible to read and write multiple waveforms. a control means having a channel; a processing means for reading a plurality of digital signals from the waveform memory using at least two waveform read/write channels of the control means and performing predetermined processing on the read digital signals; A synthesizing means for synthesizing a plurality of waveform signals obtained by the processing means, and a synthesized waveform signal obtained by the synthesizing means is supplied to the control means, and is digitally stored in the waveform memory by a predetermined waveform reading/writing channel. means for inputting and storing the plurality of digital signals as a signal; displaying a plurality of digital signals to be read from the waveform memory by the at least two waveform read/write channels; 1. An overdubbing device for an electronic musical instrument, comprising: a display means for displaying an instruction to specify the content of a predetermined process to be performed on information. (2) The processing means has a circuit means consisting of a voltage-controlled filter and a voltage-controlled amplifier corresponding to the plurality of waveform read/write channels, and converts the read digital signal into an analog signal. After being converted, the electronic device according to claim 1 is supplied to the circuit means for each channel, and after being subjected to independent timbre and volume control, is supplied to the synthesizing means. Instrument overdubbing device. (3) Reading out the at least two waveforms of the control means;
The overdubbing device for an electronic musical instrument according to claim 1, wherein the write channel is capable of reading digital signals representing the same waveform stored in the waveform memory at different scale frequencies. . (4) A patent characterized in that, as the display means performs processing to vary the tone and volume of the digital signal read out by the processing means, a display indicating the content of the processing is performed. An overdubbing device for an electronic musical instrument according to claim 1. (5) The electronic device according to claim 1, wherein the display means displays a scale to indicate in which scale the digital signal is to be read from the waveform memory by the waveform read/write channel. Instrument overdubbing device.