JPH1055182A - Waveform processing device and sound source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform various waveform processing with simple constitution. SOLUTION: A waveform processing part 1 is constituted of processing parts 100-170. In the processing part 100, when the control data A01-A03, B01-B03 are supplied to first, second selection circuits 11, 12, operators A, B are selected respectively from respective bits D0-D7 of the original waveform data GW. Thereafter, the operators A, B are operation processed by an AND circuit 13, an OR circuit 14, a NAND circuit 15 and a NOR circuit 16. Then, when these operation results are supplied to a third selection circuit 17, the operation result is selected based on the control data E01, E02 to be outputted as the first bit D0' of the conversion waveform data GW'. Further, similar processing are performed in the processing parts 110-170 also, and the conversion waveform data GW' are generated. Thus, optional bits each other are operation processed simply, and an original waveform is processed freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform processing device suitable for freely processing a signal waveform and a sound source using the same.

[0002]

2. Description of the Related Art In electronic musical instruments, so-called PCM sound sources are widely used. In this PCM tone generator, it is possible to store a plurality of waveform data in a memory in the order of sample numbers, sequentially read out the waveform data from the memory, and synthesize a musical tone using the read out waveform data. Will be Such waveform data is prepared for each tone color,
The amplitude values of a predetermined period of a basic waveform characterizing the timbre are stored in time series as data. On the other hand, at the time of reading, the interval between read addresses is changed according to the pitch to be generated, so that the period of the reproduced waveform matches the desired pitch. Compared to an analog synthesizer, such a sound source has an advantage that it can output a waveform including a complicated high frequency or a waveform having a sharp rise.

[0003]

By the way, in the field of pachinko and toys, sound effects and music are important factors for enhancing the sense of reality and attracting users' interest.
In this field, it is not required to generate complicated and delicate musical sounds as in an electronic musical instrument, but a device capable of generating various musical sounds with a simple configuration is desired. However, the sound source mentioned above is
There is a problem that the hardware scale becomes large, and it has not been used in the above fields.

The present invention has been made in view of the above circumstances, and provides a waveform processing device capable of performing various waveform processing with a simple configuration and a sound source using the same.

[0005]

According to the first aspect of the present invention, there is provided a waveform processing apparatus for performing arithmetic processing on original waveform data comprising a plurality of bits to generate converted waveform data. For each operation corresponding to each bit of the converted waveform data, a set of bits to be subjected to the operation is determined from each bit of the original waveform data based on the first control data. Bit set selecting means for selecting the set of bits from each of the bits, and calculating means for performing an operation specified by second control data on the set of bits to generate the converted waveform data for each bit. It is characterized by having.

Further, in the invention according to claim 2,
A plurality of the first control data and the second control data corresponding to the type of the waveform processing are stored in advance, and when the third control data indicating the type of the waveform processing is input, the third control data is input. A conversion table for outputting the first control data and the second control data corresponding to the type of waveform processing indicated by the control data is provided.

Further, in the invention according to claim 3,
A sound source provided with the waveform processing device, comprising: an original waveform generation unit that generates the original waveform data; and a level adjustment unit that adjusts a level of the converted waveform data.

Further, in the invention according to claim 4,
A sound source provided with the waveform processing device, wherein one original waveform data is generated from a plurality of original waveform data including the original waveform data generated by the original waveform generating unit and the original waveform data generated by the original waveform data generating unit. It is characterized by comprising a selecting section for selecting and outputting to the waveform processing section, and a level adjusting section for adjusting a level of the converted waveform data.

[0009]

DETAILED DESCRIPTION OF THE INVENTION 1. First Embodiment 1-1: Overall Configuration of Waveform Processing Apparatus Hereinafter, an overall configuration of a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a waveform processing apparatus according to an embodiment of the present invention. In FIG.
Reference numeral 1 denotes a waveform processing unit, which performs waveform processing on the original waveform data GW of 8 bits per sample based on the 64-bit control data CT 'to generate converted waveform data GW'. The waveform processing unit 1 performs an independent operation corresponding to each bit D0 'to D7' of the converted waveform data GW '. The operation is performed by each bit D0 to D7 of the original waveform data GW. , Two bits are selected from each other, and the processing is performed between these bits.
In the following description, two bits to be processed are referred to as an operator A and an operator B. Also,
Reference numeral 2 denotes a conversion table constituted by a ROM or the like, and a table for converting 8-bit control data CT into 64-bit control data CT 'is stored in the storage area.

Here, the control data CT 'will be described with reference to FIG. FIG. 2 is a diagram showing a data structure of the control data CT ′. In the figure, “A” means data related to selection of operator A, “B” means data related to selection of operator B, and “E” means data related to selection of operation type. That is, the control data Ai0-A
i2 (i = 0, 1... 7) designates the operator A and the control data B
i0 to Bi2 designate the operator B. Also, the control data Ei
0, Ei0 specifies the type of operation processing from among operations such as AND, OR, NAND, and NOR. The first suffix following the symbols A, B, and E is the converted waveform data G
It corresponds to each bit D0 'to D7' of W '. For example, the control data B31 to B32 designate an operator B used when calculating the fourth bit D3 'of the converted waveform data GW'.

1-2: Waveform Processing Unit Next, the waveform processing unit will be described in detail. FIG. 3 is a block diagram of the waveform processing unit. As shown, the waveform processing unit 1 includes processing units 100 to 170 corresponding to the bits D0 'to D7' of the converted waveform data GW '. However, since the processing units 100 to 170 have the same configuration, the first bit D0 'of the converted waveform data GW' is used here.
Will be described, and the description of the other processing units 110 to 170 will be omitted. The processing unit 100 includes the following parts. 11 and 12 are 8
These are first and second selection circuits having one input and one output, and function as means for selecting an operator. Reference numeral 17 denotes a third selection circuit having four inputs and one output, and an AND circuit 13, an OR circuit 14,
Together with the NAND circuit 15 and the NOR circuit 16, they function as arithmetic processing means.

The control data A01 to A
03 is supplied, the first control circuit 11 determines each bit D of the original waveform data GW based on the control data A01 to A03.
One bit to be operated is selected from 0 to D7. Similarly, the second selection circuit 12 controls the control data B01 to B01
Based on 03, one bit to be operated is selected from the bits D0 to D7 of the original waveform data GW. Thereby, two operators A and B to be operated are selected. The selected operators A and B are output from the AND circuit 13, OR
The arithmetic processing is performed by the circuit 14, the NAND circuit 15, and the NOR circuit 16. Thereafter, when these calculation results are supplied to the third selection circuit 17, the control data E0
The calculation result is selected based on 0 and E01 and output as the first bit D0 'of the converted waveform data GW'. In addition,
The other bits D1 'to D7' of the converted waveform data GW 'are similarly generated by the processing units 110 to 170.

1-3: Conversion Table Next, the conversion table will be described. As described above, the waveform processing unit 1 is controlled by the 64-bit control data CT ′. However, in actual waveform processing, 64
If bit data is used, the processing becomes complicated and not practical. By the way, in the above-described arithmetic processing, depending on the selection of the operators A and B and the combination of the arithmetic types,
In some cases, the same operation result can be obtained. For example, the processing of the following arithmetic expression. D7 OR D7 = D7 AND D7 D7 NOR D7 = D7 NAND D7 D7 OR D6 = D6 OR D7 In these cases, the calculation result on the left side and the calculation result on the right side match, so the converted waveform data obtained as a result of waveform processing GW 'also matches. Therefore, the control data CT 'that specifies such an arithmetic processing specifies redundant timbres and is redundant data. The control data C
When T 'designates a timbre with little change or meaningless timbre, a redundant timbre is also designated.
Therefore, in this embodiment, the redundant specification is deleted,
Control data CT ′ for specifying 256 kinds of timbres is stored in the conversion table 2 in advance. 8-bit control data C
When T is supplied to the conversion table 2, the conversion table 2
Reads 64-bit control data CT ′ from the storage area using the control data CT as a read address.
Then, waveform processing is performed based on the control data CT ′, and converted waveform data GW ′ having a predetermined tone color is generated. Therefore, a predetermined tone color can be specified by the 8-bit control data CT, and the control load is reduced.

As described above, in the present embodiment, various arithmetic processing can be performed by arbitrarily combining each bit of the original waveform data GW, so that various waveform processing can be realized by a simple configuration. Can be. In addition, the conversion table 2 contains the control data C related to the necessary processing.
Since T 'is stored in advance, the control burden can be reduced. As a result, the waveform processing device can be easily applied to fields such as pachinko and toys.

[0015] 2. Second Embodiment 2-1: Configuration of Second Embodiment A second embodiment relates to an example of a sound source using the waveform processing device of the first embodiment. The configuration of the sound source according to the second embodiment will be described with reference to the drawings. FIG.
FIG. 3 is a block diagram of a sound source according to the embodiment. FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted. In FIG. 4, reference numeral 3 denotes a current waveform generator, which generates current waveform data GW to be subjected to waveform processing based on the tone generation instruction signal ST and the waveform selection signal WS. Note that the sound generation instruction signal ST indicates the start and end of the generation of the current waveform data GW, and the waveform selection signal WS indicates the type of the current waveform data GW.

FIG. 5 is a detailed block diagram of the current waveform generator 3.
Shown in In FIG. 5, reference numeral 31 denotes a counter which counts the clock signal CK and generates a read address RA for reading the current waveform data GW. Also, 32
Is a waveform memory in which various waveforms are stored in advance. In this example, waveforms such as a sine wave, a triangular wave, a sawtooth wave, and a reverse sawtooth wave have
The amplitude value at each sample point of the cycle is stored, and one of them is selected by a 2-bit waveform selection signal WS. Note that a more complicated waveform may be stored in the waveform memory 32 instead of the above-described waveform such as a sine wave.

When the clock signal CK is supplied to the counter 31, the counter 31 counts the clock signal CK during a period when the tone generation instruction signal ST indicates generation of the original waveform, and uses the count value as a read address RA as a waveform. Output to the memory 32. Therefore, the read address RA is incremented in synchronization with the clock signal CK, whereby the original waveform data GW stored in the waveform memory 32 is
Are sequentially read.

When the original waveform data GW is supplied to the waveform processing section 1 shown in FIG. 4, the waveform processing described in the first embodiment is performed on the original waveform data GW, and the converted waveform data G
W ′ is output to one input of the multiplier 4. The other input of the multiplier 4 has a level control signal LS indicating a level.
Is supplied, where the converted waveform data GW ′ is multiplied by the level control signal LS to generate output data GW ″. Thus, the level of the output data GW ″ can be adjusted.

2-2: Operation of Second Embodiment Next, the operation of the second embodiment will be described with reference to the drawings. The operation of this embodiment can be confirmed by simulation software. FIG. 6 to FIG.
The screen by the simulation software is also shown. First, if a sine wave is selected as the original waveform data GW and no waveform processing is performed, the simulation screen is as shown in FIG. In the area S3 of the simulation screen, a sine wave, a triangular wave,
Waveform memory 32 such as sawtooth wave and reverse sawtooth wave
Of the original waveform data GW in which is stored. Then, when the mouse pointer P is overlaid on the display of the original waveform and clicked, the original waveform is selected and highlighted. In this example, since the sine wave is highlighted,
The sine wave is selected as the original waveform data GW.

Further, a bit operation expression is displayed in the area S1. Here, the bits D0 'to D7' of the converted waveform data GW 'are on the left side of the equal sign, the operator A is on the first column on the right side of the equal sign, the button B1 is on the second column, and the third is the third column. The column shows the operation type, the fourth column shows the button B2, the fifth column shows the operator B,
Button B3 is displayed in the sixth column. Then, when the button B1 in the second column is clicked using the mouse pointer P,
The operator A on the right side changes sequentially, and the button B3 in the sixth row is changed.
By clicking, the operator B on the right side is sequentially changed. When the button B2 in the fourth column is clicked, the type of calculation on the right side is sequentially changed. In this equation, the converted waveform data G
Since the first bit D0 'of W' is calculated by "D0 OR D0", it matches the first bit D0 of the original waveform data GW. The same applies to the other bits D0 'to D6', so that no waveform processing is performed.

In the area S2, a waveform conversion table indicating the input / output characteristics of the waveform processing section 1 is displayed. In this waveform conversion table, the horizontal axis represents input, and the vertical axis represents output. In this example, since the input waveform matches the output waveform, the input / output characteristic is a straight line connecting the lower left corner and the upper right corner. Further, in the area S4, the original waveform is displayed in red and the converted waveform is displayed in blue, so that the waveforms before and after the conversion can be compared at a glance. However, in this example, since the waveform processing is not performed, the original waveform and the converted waveform are displayed overlapping.

Next, a sine wave is selected as the GW obtained from the original waveform, and the 8th bit D7 'of the converted waveform data GW' is inverted by inverting the 8th bit D7 of the original waveform data GW.
Assuming that waveform conversion for generating is performed, the simulation screen is as shown in FIG. In this case, as shown in the figure, a sine wave is selected in the area S3, and in the bit operation expression displayed in the area S1, the D7 'in the first row is operated so as to be "D7 NORD7". I just need.

By the way, the sine wave in this example rises from the intermediate level "00000000" at the phase 0, and the phase π
/ 2 becomes the maximum level “01111111” and the phase π becomes “0000”
0000 "and the minimum level" 10000000 "at a phase of 3π / 2
And is set to be “00000000” at the phase 2π. Therefore, when the MSB is inverted by the waveform processing, the converted waveform rises from the minimum level “10000000” at the phase 0 as shown by the thick line in the area S4, becomes the intermediate level “11111111” at the phase π / 2, and becomes the phase π. In the vicinity, it suddenly changes from the minimum level "10000000" to the maximum level "01111111", and the intermediate level "00000000" at a phase of 3π / 2
And the level rapidly changes from the maximum level “01111111” to the minimum level “10000000” around the phase 2π.

If a sine wave is selected as the original waveform data GW and the original waveform is subjected to waveform conversion for inverting D4 of the original waveform data to generate output bit data D4 ', the simulation screen is as follows. , Shown in FIG. The converted waveform in this case is obtained by superimposing a rectangular wave on a sine wave as shown in a region S4. Further, even when a sine wave is selected as the original waveform data GW, a noise sound as shown in a region S4 of FIG. 9 can be generated depending on how the operators A and B are selected and the type of operation is selected.

As described above, according to this embodiment, since the waveform processing apparatus described in the first embodiment is applied to the sound source, it is possible to leave the characteristics of the original waveform or convert it to a completely different waveform with a simple configuration. It is possible to generate musical tones of various timbres. Further, by appropriately designating the timbre in the control data CT, the timbre can be gradually changed. For example, if the converted waveform is controlled so as to gradually approach the current waveform, an apparatus such as a sound hit game can be configured using this sound source.

[0026] 3. Third Embodiment Next, a third embodiment will be described. The third embodiment relates to another example of a sound source using the waveform processing apparatus of the first embodiment. This sound source has a point where a selection circuit is added and an original waveform generation unit that expands and contracts according to a pitch. This is the same as the sound source of the second embodiment except that the generated original waveform data is generated. Hereinafter, the differences will be described with reference to the drawings. FIG. 10 is a block diagram of a sound source according to the third embodiment. In FIG. 10, the original waveform generating section 3 'can change the pitch of the original waveform data GW according to a numerical value F (including a decimal part) indicated by the pitch signal PT.

FIG. 11 is a block diagram of the original waveform generator 3 '. In the figure, the original waveform deriving unit 3 'includes an accumulation circuit 33, a waveform memory 32, and an interpolation circuit 34. When the pitch signal PT is supplied to the accumulation circuit 33, the numerical value F indicated by the pitch signal PT is changed to the clock signal C.
It is accumulated for each cycle of K. Then, the integer part data M indicating the integer part of the accumulation result is output to the waveform memory 32 as a read address, while the decimal part data L indicating the decimal part of the accumulation result is output to the interpolation circuit 34. You.

For example, when the numerical value F is "1",
The accumulation result increases as 1, 2, 3,.... In this case, since the read address is sequentially incremented, the original waveform stored in the waveform memory 32 is sequentially read for each sample point. On the other hand, when the numerical value F is “2”, the accumulation result increases as 2, 4, 6,. Therefore, the pitch of the read original waveform is doubled. If the numerical value F can take only integers, the pitch of the original waveform to be read is limited to the octave relation, and the 12 scales within the same octave cannot be reproduced. For this reason, in this embodiment,
The numerical value F is set so that it can take a small number.

If the numerical value F is 1.05 and the accumulation result is 5.25 at a certain timing, the integer part data M becomes "5", which is supplied to the waveform memory 32 as a read address RA. , Corresponding waveform data is read. In this case, since the minority part data L exists, the read address RA is set to “6” and the waveform data is read again to perform the interpolation processing. When the two waveform data thus obtained are supplied to the interpolation circuit 34, interpolation is performed based on the decimal data L (0.25 in this example), and the original waveform data GW is generated. You. That is, in this example, according to the integer part data M, 2
One sample is read out, and interpolation between them is performed according to the minority part data L.

When the generated original waveform data GW is output to the selection circuit 5 shown in FIG. 10, the selection circuit 5 outputs one of the external input signal EXT and the original waveform data GW based on the mode signal MD. Is selected. Thus, waveform processing can be performed on the external input signal EXT. One of the selected signals is subjected to waveform conversion by the waveform processing unit 1 and then supplied to the multiplier 4 where the level is adjusted and output as output data GW ″.

As described above, according to the third embodiment, the original waveform data GW is set by appropriately setting the pitch signal PT.
Can be freely changed. Therefore, with a simple configuration, it is possible to provide a sound source that can freely change not only the tone but also the pitch. Further, since the waveform processing can be performed by selecting the external input signal EXT by the selection circuit 5, the original waveform to be processed is not limited to the one stored in the waveform memory 32. .

[0032] 4. Modifications The present invention is not limited to the above-described embodiment, and various modifications are possible, for example, as follows.

In each of the above embodiments, the calculation was performed on data sampled at the same time. However, the present invention is not limited to this. You may. Also, EX
-NOR or the like may be added to increase the number of operation combinations. The operation is performed between the operator A and the operator B. For example, “D7 ′ = (D7 AND D6) OR D
The operation may be performed on three or more operators such as “0”. In the above embodiment, the conversion table 2 is used to convert the control data CT into the control data CT ′.
And the waveform processing is controlled, but 64-bit control data CT ′ may be directly supplied to the waveform processing unit 1 without using the conversion table 2.

In the second and third embodiments, the level adjustment of the output signal GW ″ is performed by using the multiplier 4. Alternatively, the level adjustment may be performed by simply performing a bit shift. Further, the level control signal LS may be a signal for controlling a volume envelope composed of an attack section, a connection section, a decay section, and the like. In this case, for example, if the rise of the attack portion is made steep, a tone with a sharp rise can be generated. Further, a waveform of a plurality of musical tones may be stored in the waveform memory 32, and when reading the waveforms, a volume envelope may be set in accordance with the type of the musical tones to be read.

In the third embodiment, the interpolation circuit 3
In the interpolation performed in step 4, the integer part data M and the decimal part data L
, Three or more samples may be read from the waveform memory 33 and interpolated using an FIR filter. In this case, the accuracy of the interpolation can be improved. Also,
A plurality of external input signals EXT may be provided, or a plurality of original waveform data may be generated by the original waveform generator 3 '. In this case, the selection circuit 5 selects one of these input data and outputs it to the waveform processing unit 1.

In each of the above-described embodiments, an example has been described in which the original waveform generation processing and the waveform processing processing are performed by hardware. However, the present invention is not limited to this. Of course, at least one of them may be realized by software and a processor.

[0037]

As described above, according to the present invention, various waveform processing can be performed with a simple configuration. In particular, when the conversion table is used, the preset waveform processing can be efficiently performed while reducing the hardware scale. Further, it is possible to provide a sound source capable of generating various timbres with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a diagram related to a block diagram of a waveform processing device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a data structure of control data CT 'according to the embodiment.

FIG. 3 is a detailed block diagram of a waveform processing unit according to the embodiment.

FIG. 4 is a block diagram of a sound source according to a second embodiment of the present invention.

FIG. 5 is a detailed block diagram of an original waveform generator according to the embodiment.

FIG. 6 is a view showing an example of a screen by simulation software for confirming the operation of the embodiment.

FIG. 7 is a view showing an example of a screen by simulation software for confirming the operation of the embodiment.

FIG. 8 is a view showing an example of a screen by simulation software for confirming the operation of the embodiment.

FIG. 9 is a view showing an example of a screen by simulation software for confirming the operation of the embodiment.

FIG. 10 is a block diagram of a sound source according to a third embodiment of the present invention.

FIG. 11 is a block diagram of an original waveform generator according to the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Waveform processing part, 2 ... Conversion table, 3, 3 '... Original waveform generation part, 4 ... Multiplier (level adjustment part), 5 ... Selection circuit (selection part), 11, 12 ... First and second Selection circuit (bit set selection means), 13 AND circuit (arithmetic means), 14
... OR circuit (arithmetic means), 15 ... NAND circuit (arithmetic means), 16 ... NOR circuit (arithmetic means), 17 ... third selection circuit (arithmetic means), GW ... original waveform data, GW '... conversion waveform data , CT... Control data (third control data), CT ′... Control data (first and second control data).

Claims (4)

[Claims] 1. A waveform processing apparatus for performing an arithmetic process on original waveform data composed of a plurality of bits to generate converted waveform data, wherein the original waveform data is generated for each operation corresponding to each bit of the converted waveform data. Bit set selecting means for selecting the set of bits to be subjected to the operation from each bit of the original waveform data based on the first control data, and selecting the set of bits from each bit of the original waveform data; And a calculation means for performing the calculation specified by the above on the set of bits to generate the converted waveform data for each bit. 2. A plurality of first control data and a plurality of second control data corresponding to types of waveform processing are stored in advance, and when third control data indicating a type of waveform processing is input. 2. The waveform according to claim 1, further comprising a conversion table for outputting the first control data and the second control data corresponding to a type of waveform processing indicated by the third control data. Processing equipment. 3. A sound source provided with the waveform processing device according to claim 1, wherein: an original waveform generating unit that generates the original waveform data; and a level of the converted waveform data. And a level adjustment unit for adjusting the sound level. 4. A sound source comprising the waveform processing device according to claim 1 or 2, wherein: an original waveform generating section for generating original waveform data; A selection unit that selects one original waveform data from a plurality of original waveform data including the extracted original waveform data and outputs the selected original waveform data to the waveform processing unit; and a level adjustment unit that adjusts a level of the converted waveform data. A sound source characterized by the following.