JP2822960B2 - Sound signal generating device, sound signal generating method, and musical sound generating device including the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound signal generating apparatus for storing various kinds of sound information in a storage circuit, sequentially reading out the information from the storage circuit, and automatically playing a sound, especially a tune, and a sound signal generation apparatus. The present invention relates to a method and a musical sound generator including the same.

[0002]

2. Description of the Related Art A conventional sound generator has a configuration shown in FIG. In the apparatus shown in FIG. 9, first, the clock signal output from the oscillation circuit 91 is variably frequency-divided by the note length generation circuit 92. The main ROM 93 is a storage circuit for storing note length data and pitch data relating to the note of the melody 1, and uses the note length data read therefrom to generate a note length generating circuit 92.
Is set. The frequency-divided clock signal is input to the main counter 95, and the main RO
The read address of M93 is incremented according to the note length. On the other hand, the pitch data read from the main ROM 93 sets the frequency division ratio of the pitch generating circuit 94. The pitch generation circuit 94 variably divides the clock signal from the oscillation circuit 91 in accordance with the set division ratio, and outputs a clock signal having a frequency corresponding to the pitch. An envelope waveform is added to this clock signal in an envelope generation circuit 96. The envelope generating circuit 96 is composed of a capacitor C and a resistor R, and discharges the electric charge charged in the capacitor via the resistor at the next timing to form a constant exponential analog waveform. The signal to which the envelope is added is sent to the speaker, and the sound of the pitch stored in the main ROM 93 is generated for the duration of the note length. Main ROM 9
By reading the data sequentially from No. 3, a melody is automatically played.

In such a conventional sound generating apparatus, only a waveform of a sound of a square wave or a sound waveform obtained by adding a constant exponential curve-shaped envelope formed by CR to a square wave is used. However, the sound quality was poor, and it was used for telephone holding music, melody cards and the like.

[0004]

However, in the above-mentioned prior art, since the sound quality is constant, the intensity of the sound is small, the number of sound sources is small, and it is impossible to generate a rhythm sound, the sound has a natural spread. It was very difficult to generate a great sound.

Accordingly, the present invention is to solve such a problem, and an object of the present invention is to provide various sound qualities by providing a free sound waveform and envelope, and furthermore, having a sound intensity. It is an object of the present invention to provide a method for generating a sound and additionally generating a rhythm sound having a different sound quality.

[0006]

The sound signal generating device of the present invention has main storage means for storing melody information including at least pitch data, sound length data and rhythm volume data. A sound signal generating device which sequentially reads the melody information from the main storage means at time intervals according to the sound length data in the melody information,
A sound source controlled in accordance with the pitch data in the melody information read from the main storage means, and a rhythm for generating a rhythm sound signal based on the rhythm volume data read from the main storage means Sound signal generating means, wherein the rhythm sound signal generating means is a rhythm envelope waveform storage means in which data of a rhythm envelope waveform is digitally stored and read out repeatedly, and a data of the rhythm envelope waveform. A rhythm sound addition circuit for adding the rhythm sound volume data to the rhythm sound data, means for generating a pulse having a predetermined shape for forming a rhythm, and output data of the rhythm sound addition circuit and the pulse having the predetermined shape. Digital-to-analog converting means for outputting a rhythm sound signal.

Further, the digital signal from the adder circuit is
Switch means provided between the input to the analog conversion means and the reference voltage , wherein the switch means is conductive only when the rhythm volume data read from the main storage means indicates no volume. It is characterized by.

The main storage means stores rhythm sound delimiter data, and the rhythm envelope waveform storage means reads the envelope waveform from the first address when the rhythm sound delimiter data indicates a rhythm sound delimiter. If the rhythm sound delimiter data does not indicate a rhythm sound delimiter, the envelope waveform is read from the successive address.

The rhythm sound signal generating means includes a rhythm envelope counter that counts at a tempo frequency corresponding to the melody tempo, and the rhythm envelope counter corresponds to the count value of the rhythm envelope counter. A read address of the rhythm envelope waveform storage means is designated, and the count value is reset based on the rhythm sound delimiter data.

Further, the main storage means stores, at each address, the pitch data of each sound of the melody, the length data of the sound,
The rhythm sound data and the rhythm sound delimiter data are stored.

An oscillating means for outputting a fundamental frequency;
A tempo counter that divides the fundamental frequency into a tempo frequency; and a tempo frequency corresponding to the sound length in accordance with the sound length data read from the main storage unit. It is characterized by comprising a tone length programmable counter that divides the frequency, and a main counter that counts the output of the tone length programmable counter and specifies a read address of the main storage means.

[0012] The present invention is also characterized in that there is provided mixing means for generating a signal obtained by mixing the melody signal from the sound source and the rhythm sound signal.

[0013] Further, the apparatus has a plurality of rhythm sound signal generating means, and the main storage means stores a plurality of rhythm volume data for controlling the plurality of rhythm sound signal generating means, respectively. And

Further, a musical sound generating device according to the present invention is characterized in that it has the sound signal generating device and sound generating means for generating a sound based on a sound signal output from the sound signal generating device.

Further, according to the sound signal generating method of the present invention, the melody information is stored in a main storage means for storing melody information having at least sound pitch data, sound length data and rhythm volume data. The sound read from the main storage means is sequentially read from the main storage means at time intervals according to the length data of the sound in the melody information, and from the sound waveform storage means for storing sound waveform data. The waveform data of the sound is read at a sound frequency corresponding to the height data of the rhythm, and the data of the rhythm envelope waveform is repeatedly read from the digitally stored rhythm envelope waveform storage means. And outputting the rhythm sound signal based on the added data and a pulse having a predetermined shape. That.

[0016]

In the configuration of the present invention, the rhythm volume data and the data of the envelope waveform are added by the adding circuit. Therefore, even when the envelope waveform is attenuated and becomes 0, the sound can be prevented from disappearing before the rhythm volume data becomes silent.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram according to an embodiment of the present invention, wherein 1 is an oscillation circuit, 2 is a control circuit,
3 is a sound source 1, 4 is a sound source 2, 5 is a sound source 3, 6 is a rhythm sound signal generation circuit (hereinafter, referred to as "rhythm sound generation circuit"),
7 is a mixing circuit.

FIG. 2 is a circuit example of the control circuit 2 in FIG. 1 of the present invention. In the figure, 31 is a human-powered terminal for inputting the oscillation frequency from the oscillation circuit 1, 32 is a tempo programmable counter for generating a tempo by variably dividing the frequency of the terminal 31, and 33 is a frequency dividing ratio of the tempo programmable counter 32. This is a tempo ROM that stores a tempo dividing ratio for variably setting, and is addressed by an output from the control ROM 39 to output tempo data. Reference numeral 34 denotes a note programmable counter which variably divides the output of the tempo programmable counter 32 to generate the note length of each note, and 35 denotes a note length dividing ratio for variably setting the dividing ratio of the note programmable counter. Note R
OM, which is addressed by the note length information from the main ROM 37 and outputs a note length dividing ratio. Therefore, the note programmable counter 34 outputs a clock pulse having a cycle corresponding to the note length. 36 is a main programmable counter for counting the pulses for each note output from the note programmable counter 34,
37 is a variety of note information for each note of the song at each address;
A main ROM that stores note length, pitch of each sound source, volume and sound separation, rhythm volume, rhythm sound separation data, and jump data for executing repetition on a musical score. The main ROM is incremented by one note. The address is selected by the programmable counter 36.

Reference numeral 38 denotes a control unit for counting jump data, which is one of the main ROM data.
It is a counter. The jump data is generated to return the address of the main ROM 37 to the start address of the repetition when the bar needs to be repeated on the musical score. A control ROM 39 stores an address jump destination of the main ROM 37, and a control counter 38.
Increments the address. By setting or resetting the main programmable counter 36 in accordance with the stored data output from 39, the jump destination address is programmed, and the address of the main ROM 37 is jumped. The output of the control ROM 39 can address the tempo ROM 33 and change the tempo according to the score that has been jumped. Reference numeral 40 denotes an output of a tempo clock of the music from the tempo programmable counter 32. Reference numeral 41 denotes output of note data (data of pitch and volume of each sound source, sound delimiter, rhythm volume, and rhythm sound delimiter) of the main ROM 37. Both 40 and 41 are input to the sound source 1, the sound source 2, the sound source 3 and the rhythm sound generation circuit in FIG. The main ROM 37 stores note length data, pitch, volume, and sound separation data of the sound source 1, pitch, volume, and sound separation data of the sound source 2, pitch, volume, and sound separation data of the sound source 3 in one address. The volume of the rhythm sound and the sound delimiter data are stored, and each data is output to the terminal 41 in parallel.

FIG. 3 is a circuit example of the sound source in FIG. 1 of the present invention. In the figure, reference numeral 51 denotes an input terminal to which the output 40 of the tempo programmable counter 32 shown in FIG.
2 is an input terminal of the note data output 41 of the main ROM 37 to which note volume data is supplied, 54 is an input terminal of the note data output 41 of FIG. 2 to which note pitch data is supplied, and 66 is a note data of FIG. An input terminal of the output 41 to which sound separation data is supplied, and an input terminal 53 of an oscillation frequency from the oscillation circuit 1 in FIG.

An envelope ROM 55 stores data obtained by converting a sound envelope shape into a digital value.
Is the output of the tempo programmable counter 32 of FIG.
That is, the envelope counter 56 counts the clock of the cycle of the shortest note and increments the address of the envelope ROM 55. The counter 56 inputs 0 or 1 data indicating a sound break from 66,
When this data is 1 indicating a sound delimiter, the contents of the count are reset and the address of the envelope ROM 55 is set as the head address. Conversely, when the data is 0, the notes are connected by ties, and the count is continued as it is, and the output of the envelope waveform is continued. 57 adds the digital data of the envelope shape outputted from the envelope ROM 55 and the volume data outputted from the main ROM 37 of FIG. 2, and translates the envelope shape upward by the volume data in parallel; This is a first addition circuit that creates data with an equivalently increased volume.

Reference numeral 58 denotes a first DA converter for converting the added digital data of the envelope into an analog voltage value. This output voltage value is calculated from the reference voltage to the power supply voltage VDD.
To be selected between. 59 is a scale R whose address is determined by the pitch data output of the main ROM 37 in FIG.
Reference numeral 60 denotes a scale programmable counter whose frequency division ratio is determined by data stored in the scale ROM 59, and which divides the oscillation frequency into N times the frequency of the pitch of a note to be output. A waveform ROM 61 stores data obtained by converting one waveform of a sound into a digital value.
A waveform corresponding to a tone (piano sound, violin sound, etc.) desired to be output from the sound source is programmed in advance. Reference numeral 62 denotes an N-ary counter for counting the output of the scale programmable counter 60. The number of addresses of the waveform ROM 61 is N. Therefore, one waveform data of the sound is stored in the waveform ROM 6
Waveform data is repeatedly read at a frequency where the time of reading from 1 is one cycle. This frequency is the pitch frequency.

Reference numeral 63 designates an analog voltage value of the first DA converter circuit 58 as a maximum value, and divides the voltage between the analog voltage value and the reference voltage according to the digital output data of the waveform ROM 61 to convert the sound waveform data into analog data. This is a second DA conversion circuit that converts the voltage into a voltage waveform. Reference numeral 64 denotes an output of the second DA converter, which is a final output terminal of a sound source to which a waveform of a sound to which an envelope is added is output. Reference numeral 65 denotes a switch element connected between the output terminal of the DA conversion circuit 58 and the reference voltage. This switch is turned on when the volume data of 52 indicates no volume, and the voltage input to the DA conversion circuit 63 is used as the reference voltage. Then, since only the reference voltage is supplied to the DA conversion circuit 63, it does not operate and no signal is output to the D / A converter 64.

FIG. 4 is a circuit example of the rhythm sound generating circuit 6 of the present invention. In the figure, 71 is an input terminal from the tempo programmable counter 32 of FIG. 2, and 72 is a main RO of FIG.
An input terminal for rhythm sound volume data in the output data of M37, an input terminal 85 for rhythm sound delimiter data in the output data of the main ROM 37 in FIG. 2, and a reference numeral 73 for the oscillation frequency from the oscillation circuit 1 in FIG. Input terminal. A rhythm envelope ROM 74 stores data obtained by converting the envelope shape of the rhythm sound into a digital value.
The rhythm envelope counter counts the output (clock of the cycle of the shortest note) of the tempo programmable counter 32 and increments the address of the rhythm envelope ROM 74. This counter 75 is 85
When the data of 0 or 1 indicating the delimiter of the rhythm sound input from is the delimiter of 1, the count content is reset at the timing of the note switching, and the envelope ROM
The address 74 is set as the first address. When the data is 0, it is not reset.

Reference numeral 76 denotes the rhythm sound envelope digital data output from the rhythm envelope ROM 74 and the rhythm sound volume data of the output data 41 of the main ROM 37 in FIG. This is a second addition circuit (rhythm sound addition circuit) that translates upward by the volume data and creates data equivalently having an increased volume. A third D 77 converts the digital data of the envelope from the second adder circuit into an analog voltage value.
A conversion circuit. This DA conversion circuit 77 has 58 DAs.
Like the converter, it is connected between VDD and a reference voltage, and the output changes between the two voltages.

Reference numeral 78 denotes a shift register composed of a plurality of flip-flops having an oscillation frequency as a clock input, and a noise generating circuit composed of an exclusive OR circuit. 79 and 81 denote frequencies of two types of rectangular wave sounds. Two money tone ROMs storing data, 80 and 82 are money tone ROs.
A frequency division ratio is set by each of the data stored in M1 and the money sound ROM 2, and the oscillation frequency is frequency-divided according to the frequency division ratio.
These are two money sound programmable counters which respectively generate two kinds of frequencies of a square wave sound.

Reference numeral 83 designates the analog voltage output value of the third DA converter 77 as a maximum value, and mixes the noise output of the noise generation circuit 78 with the square wave outputs of the noise sound programmable counters 80 and 82 to obtain an analog voltage value. The fourth D to convert
The A-conversion circuit 84 is an output terminal for a noise to which an envelope is added and a rhythm sound created by two types of rectangular waves having different frequencies.

Reference numeral 86 denotes a switch element which is turned on when the sound volume data of the rhythm sound input from 72 indicates that there is no sound. When this switch is turned on, the output of the DA converter 77 is forced to the reference voltage level, and the DA converter 83 is supplied with only the reference voltage.
Not output to Also, the noise generating circuit 78, the output terminals of the two money sound programmable counters 80 and 82 and the DA
The input terminal of the conversion circuit 83 is selectively connected by a mask in the process of manufacturing the sound generator as an IC, so that only a necessary rhythm sound is output. FIG. 5 is an explanatory diagram of the control of the volume and rest in each sound source and rhythm sound generation circuit. In the figure, 37 is a main ROM, 102 is a sound source envelope ROM or rhythm envelope ROM. 103 to 107 are adders for adding the volume data of the main ROM and the envelope data of the envelope ROM. A dotted line frame 107 is an example of a circuit for adding one bit, and 104 to 106 have the same circuit configuration. 107 is the addition of the least significant bits, and the carry is manually input to 106. Similarly, 106 carry 1
At 05, the carry of 105 is input to 104. This adder corresponds to 57 and 76. Reference numeral 108 denotes an envelope DA conversion circuit, which corresponds to 58 and 77.

A NOR circuit 109 detects when all the volume data of the main ROM becomes 0 (rest).
Is high when the output of the NOR circuit 109 goes high.
M forcibly shorting the output of the conversion circuit to the reference voltage
The OS switch corresponds to 65 in FIG. 3 and 86 in FIG.

The operation of the whole system is as follows.

The oscillation circuit 1 shown in FIG. 1 is composed of a CR oscillation circuit, a crystal oscillation circuit, or an oscillation circuit made of a ceramic vibrator, oscillates a target frequency, and changes the oscillation frequency to the sound sources 1, 2, 3 and the rhythm sound. Input to the generation circuit. Further, a frequency obtained by dividing the oscillation frequency by 1 / M is input to the control circuit and the rhythm sound generation circuit. However, the oscillation frequency may be used as it is without performing 1 / M frequency division.

The frequency obtained by dividing the oscillation frequency input from the oscillation circuit 1 to the input terminal 31 of the control circuit shown in FIG. 2 is divided by the tempo programmable counter 32 to the frequency of the target tempo (beat). For example, if the frequency input to the tempo programmable counter 32 is 128
Hz, and the shortest note is a 32nd note in this system. In general, the tempo is expressed as quarter note = 60, which means the speed (tempo) at which 60 quarter notes are sent in one minute, so one quarter note is sent one second. Since the 32nd note is eight times faster than the quarter note, eight notes are sent per second. If the shortest note is a 32nd note, the tempo programmable count is 32.
Must generate enough frequency to output eight 32nd notes per second. This means that the tempo programmable counter 32 divides the frequency of 128 Hz into 8 Hz and outputs it. Therefore, quarter note = 60
To make, 8 /
The frequency may be divided by 128 = 1/16. 5 bit tempo
If the data stored in the tempo ROM 33 is set to several values from 00000 to 11111 in the case of a programmable counter, 32 types of tempos can be set since the frequency can be changed from 1/1 frequency division to 1/32 frequency division. This satisfies the quarter note = 60 in the above example, and allows setting the tempo from quarter note = 30 to quarter note = 960. 3
By storing some of the two types in the tempo ROM and using the output from the control ROM 39 as the address of the tempo ROM 33, the tempo can be changed during the music performance.

The frequency of the shortest note output from the tempo programmable counter 32 is input to a note programmable counter 34. When the note programmable counter 34 has 5 bits like the tempo programmable counter 32, the address of the note ROM 35 is set according to the note length data output for each note from the main ROM 37, and the 5 bit data output from the note ROM is performed. can get. Therefore, 32 bits are obtained from the 5-bit data.
One of the types of frequency division ratios is determined. 32 which is the shortest note
The frequency of one type of note from the minute note to the longest note (whole note) having a note length 32 times the 32nd note is output.

The main programmable counter 36 counts the clock of the frequency of the note output from the note programmable counter 34, selects an address of the main ROM 37 based on the count value, and selects the main ROM 37.
Address forward by note. The main ROM 37 is
Data (note length, jump data, pitch of each sound source, volume of each sound source and rhythm, and data of sound delimiter) are stored for each note of all songs. When the jump data of the note data becomes 1, the control counter 38 counts the data and at the same time outputs the data stored in the control ROM 39. The flip-flop constituting the main programmable counter 36 is set or reset and the jump of the main ROM 37 is performed. The data corresponding to the destination address is set, and the read address of the main ROM 37 is jumped. Control ROM 39
Stores the jump destination of the main ROM 37.
Each time the control counter 38 counts, the next jump destination is selected.

The output of the tempo programmable counter 32 is input to the envelope counter 56 of the sound source shown in FIG. The envelope ROM 55 stores data obtained by converting the envelope shape into a digital value. For example, when a saw-shaped envelope is formed by 4-bit data, the address 0 of the envelope ROM 55 is used.
The data as shown in FIG. Main RO
M37 also stores data as to whether or not to delimit each note. If this delimiter data is included in the note data, the envelope counter 56 is reset by a short pulse at each note delimiter. , Envelope ROM
The 55 read address is set to the 0 address. Next, the tempo programmable counter 32
The envelope counter 56 is counted at the frequency of the shortest note from, and the envelope data is sequentially read. FIG.
Is input to the input terminal 52 of FIG. 3 and added to the envelope data read by the adding circuit 57. Since the envelope data is increased by the volume data, the volume of each note can be adjusted. The digital data of the envelope from the adding circuit 57 is converted into an analog voltage value by the first DA conversion circuit 58.

On the other hand, the address of the scale ROM 59 in FIG. 3 is set by the pitch data from the main ROM 37 in FIG. The scale ROM 59 stores frequency division ratio data corresponding to the pitch, and determines the frequency division ratio of the scale programmable counter 60. The scale programmable counter 60 receives the oscillation frequency from the oscillation circuit 1 and outputs a clock frequency-divided to N times the frequency of the pitch to be output. For example, when it is desired to obtain a pitch of C4 = 256 Hz, the oscillation frequency is set to 262.144 KHZ.
, N = 32, the frequency should be divided by 1/32. The output of the scale programmable counter 60 is input to an N-ary waveform counter 62, which increments the address of the waveform ROM 61.

The waveform ROM 61 stores data obtained by converting a one-wavelength sound waveform into a digital value. For example,
Number of addresses (N) of waveform ROM 61 = 32, number of data =
In the case of 32, a sine wave is written as shown in FIG.
Therefore, when the waveform counter 62 finishes counting, one waveform having the frequency of the target pitch is output. The frequency at which this one waveform is repeatedly read is the frequency of the pitch. To change the pitch, the frequency of the clock counted by the waveform counter 62 may be changed by the scale programmable counter 60. Waveform ROM6
The digital waveform data output from the first DA
Although the signal is input to the conversion circuit 63, the second DA conversion circuit 63
Is set as the analog output voltage of the first DA conversion circuit 58 that has created the envelope, and the minimum operation voltage is set as the ground voltage.
The final output waveform from 3 is an analog sound waveform with an envelope waveform. That is, the second DA conversion circuit 6
In 3, the analog output voltage of the first DA conversion circuit 58 is divided and output according to the output data from the waveform ROM 61. When the sound volume data for the sound source is 0, the switch 65 is turned on, and the output of the sound signal from the sound source is prohibited. This switch is connected to the second D
It may be added to the output of the A conversion circuit 63.

FIG. 4 is a configuration diagram of the rhythm sound generation circuit 6. The output clock of the tempo programmable counter 32 in FIG. 2 is input to the rhythm envelope counter 75. The rhythm envelope counter 75 increments the read address of the rhythm envelope ROM 74 in which data obtained by converting the envelope shape of the rhythm sound into a digital value is stored. The digital envelope data from the rhythm envelope ROM 74 is shown in FIG.
Out of the data output of the main ROM 37, the volume data of the rhythm sound is added, and the third DA conversion circuit 77
It is converted to an analog voltage value.

On the other hand, the oscillation frequency is set to 1 /
The frequency divided by M is input, and is input to the noise generation circuit 7.
8 and input to the money sound programmable counters 80 and 82. The noise generating circuit 78 incorporates a multi-stage shift register and an exclusive-OR circuit for inputting two specific outputs of flip-flops constituting the shift register, and outputs the exclusive-OR output to the first stage of the shift register. And generates white noise with the maximum clock frequency input to the shift register.

Money sound programmable counters 80 and 82
Is a money sound ROM that stores the frequency data of the sound of the square wave
According to the frequency division ratio data output from 79 and 81, the input frequency is frequency-divided and the frequency of the target rectangular wave sound is output. The noise from the noise generation circuit 78 and the rectangular waves having different frequencies from the plurality of money sound programmable counters 80 and 82 are mixed by the DA conversion circuit 83, and the maximum operating voltage of the DA conversion circuit 83 is set to the third value. By using the analog output voltage of the DA conversion circuit 77, a rhythm sound to which an envelope is added is output. Rhythm sounds (percussion) such as drums, cymbals, and bell sounds can be freely created by the noise, the square wave, and the envelope added thereto.

Finally, the analog voltage of the sound from the plurality of sound sources and the analog voltage of the rhythm sound are mixed by the mixing circuit 7 shown in FIG. 1 to generate an analog voltage of the sound output. FIG.
FIG. 3 shows waveform diagrams when a sine wave, a square wave, and a sawtooth wave are stored in waveform ROMs of three sound sources, and a trapezoidal shape, a triangular waveform, and a trapezoidal waveform are stored in respective envelope ROMs. By storing the waveforms and envelopes of musical instruments in the waveform ROM and the envelope ROM, various timbres can be generated.

[0042]

As described above, according to the present invention, since the rhythm volume data and the data of the envelope waveform are added by the adding circuit, even if the envelope waveform is attenuated and becomes 0, the rhythm volume data is added. This has the effect of preventing the sound from disappearing before the sound volume data becomes silent.

[Brief description of the drawings]

FIG. 1 is a system diagram of an embodiment of a sound signal generating device according to the present invention.

FIG. 2 is a control circuit block diagram in one embodiment of the sound signal generating device of the present invention.

FIG. 3 is a block diagram of a sound source in one embodiment of the sound signal generating device of the present invention.

FIG. 4 is a block diagram of a rhythm sound generation circuit in one embodiment of the sound signal generation device of the present invention.

FIG. 5 is an explanatory diagram of volume adjustment and rest in one embodiment of the sound signal generator of the present invention.

FIG. 6 is an explanatory diagram of a sawtooth waveform envelope memory of a sound source of the sound signal generator according to the present invention.

FIG. 7 is an explanatory diagram of a sine waveform memory of a sound source of the sound signal generator according to the present invention.

FIG. 8 is an explanatory diagram of the entire waveform relationship of the sound signal generator of the present invention.

FIG. 9 is a block diagram of a conventional sound signal generator.

[Explanation of symbols]

 1 ··············································· Sound source 1 4 ················ Sound source 3 6 ····································· Raw circuit 7: Mixing circuit 32: Tempo programmable counter 33: Tempo ROM 34: Note programmable counter 35: Note ROM 37, 93 Main ROM 38 ··· Control counter 39 ··· Control ROM 55, 102 ··· Envelope ROM 56 ··· Envelope counter 57, 76 ··· Adder circuits 58, 63, 77, 83, 108 ··· DA conversion circuit 59 ····· Scale ROM 60 ····· Scale programmable counter 61 ··· Waveform ROM 62 ··· Waveform counter 74 ··· Rhythm Velocity ROM 75 Rhythm envelope counter 78 Noise generation circuit 79 Money sound ROM 80, 81 Money sound programmable counter 92 Note length generation circuit 96 ····· Envelope generating circuit 109 ··· NOR circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G10H 1/00 102 G10H 1/057 G10H 1/40 G10H 1/46

Claims (10)

(57) [Claims] A main memory for storing melody information including at least pitch data, sound length data, and rhythm volume data, wherein said melody information is stored in said melody information in said melody information; A sound signal generator sequentially read from said main storage means at time intervals according to length data, wherein control is performed in accordance with said sound pitch data in said melody information read from said main storage means. And a rhythm sound signal generating means for generating a rhythm sound signal based on rhythm volume data read from the main storage means, wherein the rhythm sound signal generating means comprises rhythm envelope waveform data. Rhythm envelope waveform storage means that is digitally stored and repeatedly read out, and the rhythm envelope waveform data and A rhythm sound adding circuit for adding rhythm volume data; a means for generating a pulse having a predetermined shape for forming a rhythm; a rhythm sound based on output data of the rhythm sound adding circuit and the pulse having the predetermined shape. Digital output signal
A sound signal generator comprising: an analog converter. Wherein before Symbol Digital analog from said adder circuit
Switching means provided between an input to the analog conversion means and a reference voltage , wherein the switching means is conductive only when the rhythm volume data read from the main storage means indicates no volume. The sound signal generator according to claim 1, wherein: 3. The main storage means stores rhythm sound delimiter data, and the rhythm envelope waveform storage means reads an envelope waveform from a head address when the rhythm sound delimiter data indicates a rhythm sound delimiter. 2. The sound signal generating apparatus according to claim 1, wherein if the rhythm sound delimiter data does not indicate a rhythm sound delimiter, the envelope waveform is read from a continuous address. 4. The rhythm sound signal generating means includes a rhythm envelope counter counted at a tempo frequency corresponding to a melody tempo, wherein the rhythm envelope counter is responsive to a count value of the rhythm envelope counter. 4. The sound signal generator according to claim 3, wherein a read address of the rhythm envelope waveform storage means is designated, and the count value is reset based on the rhythm sound delimiter data. 5. The main storage means stores pitch data, length data, rhythm volume data, and rhythm sound delimiter data of each sound of a melody at each address. 4. The sound signal generator according to claim 3, wherein: 6. An oscillating means for outputting a fundamental frequency; a tempo counter for dividing the fundamental frequency into a tempo frequency; and a sound length data read from the main storage means. A programmable counter for the duration that divides the frequency of the tempo to a frequency corresponding to the duration of the note; and a main counter that counts the output of the programmable counter for the duration and specifies the read address of the main storage unit. The sound signal generator according to claim 1, further comprising: 7. A sound signal generating apparatus according to claim 1, further comprising a mixing means for generating a signal obtained by mixing a melody signal from said sound source and said rhythm sound signal. 8. It has a plurality of said rhythm sound signal generating means,
2. The sound signal generating device according to claim 1, wherein said main storage means stores a plurality of rhythm volume data for controlling each of said plurality of rhythm sound signal generating means. 9. A musical sound generator comprising: the sound signal generator according to claim 1; and a sounding means for generating a sound based on a sound signal output from the sound signal generator. apparatus. 10. A main memory for storing melody information including at least pitch data, sound length data and rhythm volume data, wherein said melody information is stored in said melody information. sequentially read from the main storage means at time intervals corresponding to the data from the waveform storing means for storing the data of the waveform of the sound, the
The waveform data of the sound is read out at a sound frequency corresponding to the pitch data read out from the main storage means, and the rhythm envelope waveform data is repeated from the digitally stored rhythm envelope waveform storage means. A sound signal generating method which adds the data of the rhythm envelope waveform and the rhythm volume data, and outputs a rhythm sound signal based on the added data and a pulse having a predetermined shape.