JPS62125395A - 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 Field of Industrial Application The present invention relates to an electronic musical instrument called a so-called sampling keyboard or sampler that inputs various sounds such as two musical instrument sounds and outputs them as sounds of a desired pitch. It is related to.

2. Description of the Related Art In recent years, advances in semiconductor technology, particularly memory technology, have made it possible to use large amounts of memory at low cost.

Against this background, many manufacturers have commercialized electronic musical instruments generally called sampling keyboards or samplers. Such electronic musical instruments can be used to record sounds arbitrarily selected by the user and to play back the sounds at various pitches. In other words, it is an electronic musical instrument that allows the user to play the sounds that he or she has recorded as the timbre of the keyboard instrument, just as a so-called keyboard instrument would specify the timbre of a piano or guitar.

For example, as a method of disclosing such technology using a computer, there is a document by Mr. FREEDMAN entitled "Journal of the Audio Engineering Society J.
di.

Engineering 5ociety, T, A, E
,S,Volume 15゜Number I Ja
Nuary 1967 pages 43-50).

Also, examples of such electronic musical instruments using keyboards include Fairlight C, M, 1. There is.

(AUSTRALIA,Fuirlight Inst.
rumentsPty, Ltd, Fairlight
C, M, I, -ReadyReference
Guide) The following is an overview of sampling keyboards.

"Classification of Bi-Technological Instruments" by Shun Furuyama, Music Trade Magazine, January 1986 issue, pages 38-43, Music Trade@) Publishing).

The above electronic musical instrument will be described below with reference to the drawings.

FIG. 3 shows the configuration of the above-mentioned electronic musical instrument.

In Fig. 3, 1 is an AD converter that converts an analog signal into a digital signal (hereinafter referred to as AD conversion), 2 is a memory that stores and outputs the digital signal, and 3 is a converter that converts a digital signal into an analog signal (hereinafter referred to as DA conversion). 4 and 6 are first and second clock generation units that generate clocks, 6 is a multiplier, 7 is a control unit, 9 is an input for instructions regarding AD conversion or DA conversion, that is, recording or playback. This is an input section for

The operation of the electronic musical instrument configured as described above will be described below.

First, when the input section 8 is instructed to perform AD conversion, that is, recording, the input section 8 outputs a signal to the control section 7 instructing the start of AD conversion. The control section 7 outputs a clock generation start signal for AD conversion to the first clock generation section 4, and outputs an address signal indicating the memory address Q to the memory 2. After the clock generation start signal for the AD conversion is input, the first clock generation section 4 performs the AD conversion first 1 and the control section 7.
It outputs an AD conversion clock signal of a constant period, ie, a sampling clock. AD converter 1 converts an input analog signal into a digital signal every sampling clock, and is generally made of a low-pass filter, a sample hold, and an AD converter to satisfy the sampling theorem.

The AD converter 1 converts the input analog signal into a digital signal and outputs it to the memory 2 every time the AD conversion clock signal is input. On the other hand, the control unit 7
When the AD conversion clock signal is input, the memory 2
After outputting the write signal to
Outputs an address signal that increases by 1. That is, the memory address becomes address "1". The memory 2 sends A to the memory address corresponding to the address signal input from the control unit 7.
The digital signal input from the D converter 1 is written or stored in accordance with the timing of the write signal. in the end,
The first AD-converted digital signal is stored in the memory address @0'' of the memory 2.Control unit 7
When the memory address indicated by the output address signal becomes larger than the maximum memory address that can be stored in memory 2, it outputs a clock generation stop signal for the end of AD conversion, but when the address signal indicates When the memory address is not larger than the maximum value of memory addresses that can be stored in memory 2, the above-described operation is repeated. The first clock generator 4 stops outputting the AD conversion clock when the clock generation stop signal for AD conversion is input.

With the above operation, the analog signal input to the AD converter 1 after the start of AD conversion is converted into a digital signal for each cycle of the AD conversion clock signal output from the first clock generator 4 and is stored at the memory address "01" of the memory 2. The data will be sequentially stored in all memory addresses that can be stored.

Next, when DA conversion, that is, output musical tone is instructed to the input section 8,
The input section 8 outputs a musical tone information signal regarding the pitch and intensity (hereinafter referred to as "touch") of the output musical tone instructed to the control section 7. When the musical tone information signal is input, the control section 7 generates a time period signal and DA for generating a clock signal having a time period proportional to the pitch of the instructed output musical tone to the second clock generating section 5. It outputs a clock generation start signal for conversion, and also outputs an address signal indicating the memory address "'oj" to the memory 2, and outputs a multiplier value corresponding to the touch of the specified output musical tone to the multiplier 6. After the clock generation signal for the DA conversion is input, the second clock generation section 6 generates a DA conversion clock signal, so-called sampling clock, having a time period according to the time period signal, and transmits it to the control section 7 and the DA conversion section 3. Output to.

When the control unit 7 receives the DA conversion clock signal,
After outputting a read signal to the memory 2, an address signal that increases the memory address by "1" is output. That is, the memory address becomes address "1". The memory 2 reads out the digital signal at the memory address corresponding to the address signal inputted from the control section 7 in accordance with the timing of the readout signal and outputs it. The control unit 7 controls the DA when the memory address indicated by the output address signal becomes larger than the maximum value of the memory address that can be stored in the memory 2.
A clock generation stop signal for DA conversion is output when the conversion is completed, but if the memory address indicated by the address signal is not larger than the maximum value of the memory address that can be stored in memory 2, the above operation is repeated. .

On the other hand, the digital signal output from the memory 2 is multiplied by a multiplier value corresponding to the touch of the specified output musical tone in the multiplier 6, and then output to the DA converter 3. It is assumed that the multiplier 6 also operates at each timing of the DA conversion clock signal.

The DA converter 3 is generally made up of a latch that holds a digital signal, a DA converter, and a low-pass filter that removes aliased frequency components, and the digital signal updated every sampling clock is held in the latch and held. The resulting digital signal is converted into an analog signal by a DA converter, and then the folded frequency component is removed by a low-pass filter.

The DA converter 3 converts the digital signal output from the multiplier 6 into an analog signal at a timing according to the DA conversion clock signal, and outputs the analog signal as a musical tone signal.

The second clock generator 6 stops outputting the DA conversion clock when the clock stop signal for DA conversion is input. Through the above operations, after the start of DA conversion, the digital signal stored in the memory 2 is transferred to the memory address @o'
``Sequentially, all the digital signals stored in the second
After the clock generator 5 outputs the DA conversion clock signal every cycle, the multiplier 6 multiplies the clock signal according to the touch, and the DA converter 3 outputs it as an analog signal, that is, a musical tone signal. become.

During the above-described DA conversion operation, when the input section 8 is instructed to stop the musical tone output, the input section 8 outputs a musical tone output stop signal to the control section 7. When the musical tone output stop signal is input, the control section 7 outputs a clock generation stop signal for the DA conversion, and ends the DA conversion.

The pitches of the input analog signal to be AD converted and the output analog signal obtained by DA conversion are Na and Nd [H
If z:l and the conversion clocks for AD conversion and DA conversion are respectively Ta and Td (SEC), the following relational expression is obtained.

Td Nd=Na ・ □ Ta Therefore, the input analog signal with a pitch of Na (Hz) is
An output analog signal with a pitch of Nci (Hz) is output.

By preparing a plurality of sets of the above configurations, an electronic musical instrument that simultaneously outputs musical tones of a plurality of types or pitches is constructed.

Problems to be Solved by the Invention However, with the above configuration, the pitch Na (Hz) of the input analog signal to be recorded is different from the pitch of the normal scale tone, that is, the checking is out of alignment. In this case, the pitch Nd(H
z) as the pitch of a normal scale note, A
Tuning had to be done by arbitrarily adjusting the clock time period Ta [Hz] during D conversion. This means not only that the AD conversion or recording operation must be repeated, but also that the signal to be recorded must be from a reproducible sound source such as a tape recorder or record. That is, when directly AD converting the sound of a musical instrument such as a trumpet whose sound changes each time, there is a problem that tuning cannot be performed.

In view of the above problems, the present invention provides an electronic musical instrument that can be tuned with just one AD conversion.

Means for Solving the Problems In order to achieve this object, the electronic musical instrument of the present invention includes an AD converter that converts an input analog signal into a digital signal, and a memory for the digital signal output from the AD converter. an input memory for processing a digital signal, a processing control section for processing a digital signal stored in the input memory in response to an instruction input regarding processing of the digital signal, and outputting the processed digital signal; It is comprised of an output memory that stores a processed digital signal to be output, and a DA converter that converts the digital signal in the output memory into an analog signal.

Function: With this configuration, the digital signal stored in the input memory after being output from the AD conversion section is nuked and output. The processed digital signal output from the processing control section is stored in the output memory, so during DA conversion, the digital signal stored in the output memory is read out in the same way as in the conventional example, and the DA conversion section converts it into an analog signal. By simply converting, a processed analog signal with a tuned pitch can be obtained. Also, if the processed digital signal is still out of tune, change the instruction input regarding processing to the processing control unit and try again.
Immediately, by processing the digital signal stored in the input memory, the retuned digital signal is stored in the output memory.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an electronic musical instrument according to an embodiment of the present invention. In FIG. 1, 1o is an input memory that stores the digital signal AD-converted by AD conversion 1, and 12 is an input memory that reads the digital signal stored in the input memory 1o and processes it in accordance with the instruction input. A processing control unit 11 that outputs the processed digital signal is a memory that stores the processed digital signal.

Note that 1 is an AD conversion section, 3 is a DA conversion section, (and 5 are first and second clock generation sections, respectively, 6 is a multiplier, 7 is a control section, and 8 is an input section. These are the same as in the conventional example. It is the same as the configuration.

The operation of this embodiment configured as described above will be described below.

First, when the input unit 8 is instructed to perform AD conversion, that is, recording, the AD
The conversion signal 1, the first clock generating section 4, the control section 7, and the input section 8 operate in the same manner as in the conventional example, and the input memory 10 receives the following information.
In this case, it is assumed that the input memory 1o operates in the same manner as the memory 2 shown in the conventional example.

The processing control unit 12 performs the following operations in order to process the digital signal based on the input pitch ratio r.

First, after reading the digital signal at the memory address "0" of the input memory o, it is stored at the memory address "0#" of the output memory 1.

The digital signal Yi to be stored at memory address 21 in the output memory 1 can be obtained as follows.

Letting R be the value obtained by multiplying the pitch ratio r by i, the largest integer value j smaller than R is obtained. Next, the digital signal
Yi can be obtained by reading out and xj+1 and calculating the following equation.

Y・=x・+(xj+1−xj)(R−j)・・・・・・
...(1)l] The pressurization control unit 12 sequentially stores the digital signal Yi in the memory capacity 21 address in the output memory 1 obtained as described above in the output memory 1, (j+1) reads the digital signal from the output memory 1 or the output memory 11 storing the digital signal Y processed for input, thereby generating the DA converter 3 and the second clock. The unit 5, the multiplier 6, the control unit 7, and the input unit 8 operate in the same way as in the conventional example.
Conversion will be carried out.

FIG. 2 illustrates digital signals stored in the input memory 1o and the output memory 11. FIG. 2a shows a digital signal stored in the input memory 1o, and FIG. 2 shows a digital signal stored in the output memory 11. Figure 2 shows r=1 for the digital signal in Figure 2a.
This is an example of processing No. 5.

In addition, in this example, the calculation for processing the digital signal is (
Although linear interpolation using equation 1) is used, this may also be a higher-order interpolation.

As described above, according to this embodiment, the memory has two memory configurations: the input memory 10 for AD conversion and the output memory 11 for DA conversion, and the process (pitch conversion) is performed. Therefore, when the pitch of a musical tone output by DA conversion is dissatisfied, tuning can be performed by changing the processing instruction (pitch conversion instruction) to the processing control section 12. Furthermore, since the processing (pitch conversion) is realized without changing the contents of the output memory 11, the AD conversion operation only needs to be performed once.

Effects of the Invention The present invention is such that when transferring a signal from an input memory storing an AD converted signal to an output memory, a processing control section performs signal processing (pitch conversion) processing on the transferred signal. Therefore, it is possible to provide an electronic musical instrument that can be tuned by repeating signal processing (pitch conversion) any number of times without destroying the signal in the input memory obtained by AD conversion.

[Brief explanation of drawings]

FIG. 1 is a diagram of an electronic musical instrument according to an embodiment of the present invention, and FIG. 3 is a block diagram of an electronic musical instrument according to the prior art. 1...AD conversion section, 3. River...DA conversion section, 1
o: Input memory, 11: Old output memory, 12: Processing control unit. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure (Q) - 45 Karihana I group

Claims (1)

[Claims] An electronic musical instrument that records various sounds and reproduces them as desired pitches, which includes an AD converter that converts the analog signal of the recorded sound into a digital signal, and stores the digital signal output from the AD converter. an input memory, an output memory that stores a digital signal, and a DA that converts the digital signal output from the output memory into an analog signal.
An electronic musical instrument comprising: a conversion section; and a processing control section that processes a digital signal in the input memory in response to an instruction input and stores it in the output memory.