JP2002149161A - Sound source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound source device decreased in the number of control commands to be externally inputted. SOLUTION: A pitch control command is inputted to a control instruction analysis circuit 11 to instruct a sound volume control circuit 15 to rapidly attenuate a sound volume by a sound volume circuit 16, and to instruct a read control circuit 13 to stop read-out processing by a read circuit 14, set a read-out rate, and start read-out processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound source device for reproducing an audio waveform in response to a control command input from the outside.

[0002]

2. Description of the Related Art Conventionally, in a device such as a pachinko or pachislot game machine, in order to enhance amusement, a sound effect is generated or a display means such as a lamp or LCD is provided in response to a change in a game state such as a prize. Is changed. Such devices include a sound source LSI as a means for generating the sound effect,
A CPU, a memory, and the like are provided. The sound source LSI generates the above-mentioned sound effect by reading out PCM data (referred to as audio waveform data) such as voice and musical sound stored in the memory in accordance with a control command input from the CPU and reproducing the audio waveform. I do.

Here, in the above-mentioned sound source LSI, reproduction control is performed such that a melody is played by changing the reproduction pitch of an audio waveform to be reproduced in a musical scale.
By performing such a reproduction control, a melody with a variety of changes can be created with a simple configuration and using one basic audio waveform.

[0004]

However, in the above-mentioned conventional sound source LSI, when the reproduction pitch is changed musically, the reproduction stop command for stopping the reproduction of the audio waveform and the reproduction pitch of the audio waveform are changed. It is necessary to input three control commands from the CPU, that is, a pitch control command to perform the reproduction and a reproduction start command to restart the reproduction of the audio waveform.

Further, in the above-mentioned conventional sound source LSI, in order to realize natural reproduction in terms of audibility, the volume of an audio waveform being reproduced is attenuated, reproduction of the audio waveform is stopped, and then, at a different reproduction pitch. Resuming the reproduction of the audio waveform has been performed. In this case, it is necessary to input from the CPU a total of four control commands including a volume control command for attenuating the volume of the audio waveform and the above-described reproduction stop command, pitch control command, and reproduction start command. As described above, in the conventional sound source device represented by the sound source LSI, it is necessary to input many control commands from the CPU.
There is a problem that the exchange with U is complicated and the load on the CPU is large.

The present invention has been made in view of the above circumstances, and has as its object to provide a sound source device in which control commands input from the outside are reduced.

[0007]

According to a sound source apparatus of the present invention for achieving the above object, a sound source apparatus for reproducing an audio waveform in response to a control command input from the outside receives a predetermined single control command. A mode in which reproduction of the audio waveform being reproduced is stopped, a reproduction pitch is changed, and reproduction of the audio waveform is restarted.

Since the tone generator of the present invention has the above-described mode, the conventional technique for inputting three control commands of a playback stop command, a pitch control command, and a playback start command when changing the playback pitch musically. And only one control command needs to be input. Therefore, the number of input control commands is small, the exchange with the CPU is simplified, and the load on the CPU is reduced.

Here, in addition to the above-mentioned mode, a mode for receiving a predetermined single control command to attenuate the volume of the audio waveform currently being reproduced and instructing to stop the reproduction of the audio waveform. It is preferable to have

With such a mode, when attenuating the volume of the audio waveform currently being reproduced and stopping the reproduction of the audio waveform, two conventional control commands of a volume control command and a reproduction stop command are used. Only one control command needs to be input as compared with the input technology.
Therefore, the exchange with the CPU is simplified and C
The burden on the PU is also reduced.

[0011]

Embodiments of the present invention will be described below.

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the tone generator of the present invention.

A sound source LSI 10 shown in FIG. 1 corresponds to a sound source device according to the present invention.
Is connected to a ROM 20 storing audio waveform data.

The sound source LSI 10 includes a control command analysis circuit 1
1, a register 12, a read control circuit 13, a read circuit 14, a volume control circuit 15, and a volume circuit 16
And a display control circuit 17.

The control command analysis circuit 11 receives and analyzes a control command from a CPU (not shown) and analyzes a control signal representing the analyzed control command as a readout control circuit 13 and a volume control circuit 15, which will be described in detail later. Control circuit 17
, And exchange data with the register 12.

The register 12 holds parameters such as a time constant required for a pitch change and a time required for a sound volume decay.

The read control circuit 13 controls the read start / stop of the read circuit 14, the instruction of the read start address, and the read speed based on the control signal supplied from the control command analysis circuit 11. There are at least two modes of controlling the read speed. One is to control the read circuit 14 at the read speed specified by the control command analysis circuit 11. The other is to control the read circuit 14 so as to interpolate the read speed designated last time and the read speed designated this time with a desired time constant.

The read circuit 14 is a read control circuit 1
3, based on the read start / stop instruction, read start address instruction, and read speed supplied from
The audio waveform data stored in the ROM 20 is read, and an audio waveform signal is generated at a reproduction pitch based on the reading speed. If the audio waveform data stored in the ROM 20 has been compressed, a decompression process is also performed.

The volume control circuit 15 includes a control command analysis circuit 1
The level control of the volume circuit 16 is performed based on the control signal supplied from 1. Level information that does not change over time, or level information (envelope information) that changes over time with a predetermined or desired time constant is supplied to a volume circuit 16. According to the information, the volume of the audio waveform signal supplied from the read circuit 14 is controlled.

The display control circuit 17 includes a control command analysis circuit 1
1. Control such as generating a display control signal based on the control signal supplied from the control signal 1 and the audio waveform signal supplied from the volume circuit 16, and dynamically turning on an external display (not shown) such as a lamp. Perform Note that dynamic lighting here refers to a case where the lighting is brighter as the sound volume increases, and the lighting brightness decreases as the sound volume decreases.

FIG. 2 is a diagram showing the structure of a control command input to the control command analysis circuit shown in FIG.

As shown in FIG. 2, the control command has a two-byte structure of a status byte and a data byte.
The status byte indicates the type of the control command.
Consists of hexadecimal data. On the other hand, the data byte is
It consists of hexadecimal instruction data for the control command represented by the hexadecimal data constituting the status byte.

FIG. 3 is a diagram showing the structure of each control command.

FIG. 3A shows the structure of a reproduction start command. This playback start command is the data 'A
It is represented by a status byte represented by 0'H and data bytes '00'H to'FF'H for indicating a phrase number.

FIG. 3B shows the structure of a playback stop command. The reproduction stop command includes a status byte represented by data 'B0'H and data'00'H to 'F' for instructing a mode of reproduction stop.
Represented by data bytes up to F'H.

FIG. 3C shows the structure of a volume control command. The volume control command includes a status byte represented by data 'C0'H, and data'00'H to 'FF'H for designating a volume value.
Up to the data byte.

FIG. 3D shows the structure of a display control command. The display control command includes a status byte represented by data 'E0'H and data'00'H to 'FF'H for instructing a display mode.
Up to the data byte.

FIG. 3E shows the structure of a pitch control command which is a feature of this embodiment. As will be described in detail later, the pitch control command is composed of four types of status bytes from data 'D0'H to'D3'H determined by a combination of the values of flag 1 and flag 2 each consisting of one bit. It is represented by one data byte for indicating.

FIG. 4 is a diagram showing the function of two flags in the status byte constituting the pitch control command.

The flag 1 is for instructing a mode for changing the reproduction pitch. When the flag 1 is "0", the mode is for instructing only the change in the reproduction pitch. On the other hand, when the flag 1 is “1”, the mode is one in which the reproduction of the audio waveform currently being reproduced is stopped, the reproduction pitch is changed, and the reproduction is restarted from the beginning of the audio waveform.

The flag 2 is for instructing the volume control mode. When the flag 2 is "0", the mode is for instructing not to perform the volume control.
On the other hand, when the flag 2 is “1”, the mode is a mode in which the volume of the audio waveform being reproduced at present is rapidly attenuated.

In the present embodiment, the pitch control command for controlling the reproduction pitch of the audio waveform includes four types of data 'D0'H to'D3'H determined by the combination of the values of the flags 1 and 2. Status byte. Here, when a pitch control command having flags 1 and 2 both set to “1” is input from the CPU to the control command analysis circuit 11, the volume of the audio waveform currently being reproduced is rapidly attenuated and the audio waveform is attenuated. , The playback pitch is changed, the playback pitch is changed, and the playback is restarted from the beginning of the audio waveform, with a single control command. Therefore, compared with the conventional technology of inputting a total of four control commands from the CPU, that is, a volume control command, a reproduction stop command, a pitch control command, and a reproduction start command, the exchange with the CPU is simplified and CPU
The burden of is also reduced.

FIG. 5 is a flowchart of a main routine executed by the control command analysis circuit shown in FIG.

In this main routine, a CP (not shown)
The processing corresponding to the value of the status byte constituting the control command input from U to the control instruction analysis circuit 11 is performed as described below.

First, in step S1, it is determined whether a new control command has been received. If it is determined that a new control command has not been received, step S1 is repeatedly executed until a new control command is received. If it is determined that a new control command has been received, the process proceeds to step S2.

In step S2, it is determined whether the new control command is a reproduction start command ('A0'H). If it is determined that the command is a reproduction start command, the process proceeds to step S3. In step S3, a reproduction start process is performed. In the reproduction start processing, the instruction data of the data byte constituting the reproduction start command is sent to the read control circuit 13. The read control circuit 13 sets the read start address to the beginning of the audio waveform data of the phrase number indicated by the instruction data, and controls the read circuit 14 to read the audio waveform data from the ROM 20.

On the other hand, if it is determined in step S2 that the new control command is not a reproduction start command, the process proceeds to step S4. In step S4, it is determined whether or not the command is a reproduction stop command ('B0'H). If it is determined that the command is a playback stop command, the playback stop process of step S5 is executed. In the reproduction stop processing, the instruction data of the data byte constituting the reproduction stop command is sent to both the read control circuit 13 and the volume control circuit 15. Here, when the instruction data is “00” H, the read control circuit 13 controls the read / read circuit 14 to immediately stop the reproduction of the audio waveform. On the other hand, when the instruction data is from '01'H to'FF'H, the volume control circuit 15 controls the volume circuit 16 so as to attenuate the volume value with a desired time constant, and the read control circuit 13 The reading circuit 14 is controlled so as to stop reading according to the time constant.

If it is determined in step S4 that the command is not a reproduction stop command, the flow advances to step S6. In step S6, it is determined whether or not the command is a volume control command ('C0'H). If it is determined that the command is a volume control command, a volume control process is executed in step S7. In this volume control processing, the instruction data of the data byte constituting the volume control command is sent to the volume control circuit 15. The volume control circuit 15 controls the volume circuit 16 so that the larger the value of the transmitted instruction data is, the larger the value of the volume is.

If it is determined in step S6 that the command is not a volume control command, the flow advances to step S8. In step S8, pitch control commands ('D0'H to' D
3′H) is determined. If it is determined that the command is a pitch control command, the process proceeds to step S9, and a pitch control process described later is executed. On the other hand, if it is determined that the command is not a pitch control command, the process proceeds to step S10.

In step S10, it is determined whether the command is a display control command ('E0'H). If it is determined that the command is a display control command, the process proceeds to step S11 to execute a display control process. Here, the instruction data of the data byte constituting the display control command is sent to the display control circuit 17. The display control circuit 17 turns off a display such as a lamp (not shown) when the instruction data is '00' H, and constantly turns on the display when the instruction data is 'FF' H. A display control signal is output to the display. When the instruction data of the data byte is '01'H to'FE'H, the display control circuit 17 dynamically turns on a display such as a lamp according to the volume of the audio signal input from the volume circuit 16. A display control signal is output so as to cause
Return to On the other hand, if it is determined that the command is not a display control command, the process returns to step S1.

FIG. 6 is a flowchart of the pitch control processing routine shown in FIG.

As described in step S8 shown in FIG. 5, upon receiving the pitch control command, the control command analyzing circuit 11 executes the pitch control processing routine shown in FIG. First, in step S21, it is determined whether the flag 2 of the pitch control command is "1". If it is determined that the flag 2 is “1”, step S22
Proceed to.

In step S22, the control instruction analysis circuit 1
1 sends data to the volume control circuit 15 to attenuate the volume rapidly. In response to this, the volume control circuit 15
The sound volume value of the sound volume circuit 16 is rapidly attenuated by a predetermined time constant, and the process proceeds to the next step S23. On the other hand, when it is determined that the flag 2 is not “1” (is “0”), the process directly proceeds to step S23.

In step S23, it is determined whether the flag 1 of the pitch control command is "1". When it is determined that the flag 1 is “1”, the process proceeds to step S24. In step S24, data for stopping the reproduction of the audio waveform is sent to the read control circuit 13. The read control circuit 13 instructs the read circuit 14 to stop the read processing of the audio waveform data currently being read, and proceeds to step S25. In step S25, a read pitch, that is, a read speed is set in the read control circuit 13 based on the read pitch data of the data byte constituting the pitch control command. Next, in step S26, data for starting reproduction of the audio waveform is sent to the read control circuit 13.
The read control circuit 13 sets the read start address at the beginning of the audio waveform data, controls the read circuit 14 to start reading the audio waveform data again, and exits this routine.

On the other hand, if it is determined in step S23 that the flag 1 of the pitch control command is "0", the flow proceeds to step S27. In step S27, based on the reproduction pitch data of the data byte constituting the pitch control command, the read control circuit 13
That is, the reading speed is set. Read control circuit 13
Is used to cause the readout circuit 14 to read out audio waveform data,
Control is performed so as to gradually change toward the reading speed based on the set value, and the process exits this routine.

In this embodiment, in response to the pitch control command, the volume of the currently reproduced audio waveform is attenuated to stop the reproduction, the reproduction pitch is changed, and the reproduction of the audio waveform is resumed. Although the present invention has been described, the present invention is not limited to this. According to the present invention, upon receiving a predetermined single control command, the reproduction of the audio waveform currently being reproduced is stopped, the reproduction pitch is changed, and the reproduction of the audio waveform is performed. What is necessary is just to restart.

[0047]

As described above, according to the tone generator of the present invention, the number of control commands input from the outside can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of a sound source device of the present invention.

FIG. 2 is a diagram showing a configuration of a control command input to a control command analysis circuit shown in FIG.

FIG. 3 is a diagram showing a configuration of each control command.

FIG. 4 is a diagram showing functions of two flags in a status byte constituting a pitch control command.

FIG. 5 is a flowchart of a main routine executed by the control command analysis circuit shown in FIG.

FIG. 6 is a flowchart of a pitch control processing routine shown in FIG. 5;

[Explanation of symbols]

 Reference Signs List 10 sound source LSI 11 control command analysis circuit 12 register 13 read control circuit 14 read circuit 15 volume control circuit 16 volume circuit 17 display control circuit 20 ROM

Claims (2)

[Claims] 1. A sound source device for reproducing an audio waveform in response to a control command input from the outside, comprising: receiving a predetermined single control command, stopping reproduction of an audio waveform currently being reproduced, and setting a reproduction pitch; A sound source device having a mode for instructing to change and resume reproduction of the audio waveform. 2. In addition to the above mode, a mode for receiving a predetermined single control command, attenuating the volume of the audio waveform currently being reproduced, and instructing to stop the reproduction of the audio waveform is provided. The sound source device according to claim 1, further comprising: