KR970002676B1 - Karaoke system and its control method - Google Patents

Abstract

A main memory(120) comprising a RAM and a ROM, and an audio output part(116) is composed of a digital/analog converter(116a) that converts a digital sound signal(accompaniment signal) output from a PCM sound source chip(112) to analog signal, an amplifying part(116b) that amplifies the output signal of the digital/analogue converter and an audio mixer(116c) that outputs accompaniment signal mixed with an user's voice signal through an audio output group(118). On control of the image song accompaniment system, it reads the lyric caption, background image and graphic data at an accompaniment data storage part(150), according to the initial velocity key signal, controling the initialization of the whole system at a main CPU(200).

Description

Video Accompaniment System and Its Control Method

1 is a block diagram of a conventional video accompaniment system.

2 is a block diagram of an image flexible accompaniment system according to the present invention.

3 is a detailed block diagram of an audio output unit of an image flexible accompaniment system according to the present invention.

4 is a diagram illustrating a stack area of an image flexible accompaniment system according to the present invention.

5 is a time division control flow diagram of an image flexible accompaniment system according to the present invention.

* Explanation of symbols for main parts of the drawings

112: PCM sound source chip 113: sound source data memory

116: audio output unit 120: main memory

130: video processing unit 140: key interface unit

150: accompaniment data storage 200: main CPU

210: interrupt generator

The present invention relates to an image flexible accompaniment system and a control method thereof. In particular, a central processing unit for controlling a separate sound source chip in an image flexible accompaniment system using a pulse code modulation (PCM) type sound source chip for accompaniment generation (hereinafter, The present invention relates to an image flexible accompaniment system and a method of controlling the entire accompaniment system and accompaniment generation control of the sound source chip in a time-division manner.

The conventional image accompaniment system using the PCM sound source chip has a main memory 120 for storing a program for controlling the image accompaniment as shown in FIG. 1 and providing a storage area necessary for the operation of the image accompaniment system. The video processing unit 130 receives the graphic information for the background image and loads the lyrics for the background image and the graphics for the background image, and a key interface unit 140 for receiving a key input for specifying the image song accompaniment. Accompaniment arrangement data and lyrics subtitles and background image graphic data for storing the accompaniment data storage unit 150 and the accompaniment data storage unit based on the selection key signal input through the key interface unit 140 ( The main CPU 200 for controlling the image accompaniment by reading the arrangement data of the tune selected from 150) and the graphic data for the lyrics subtitles and the background image, and the main CPU 200 of the main CPU 200. The audio processing unit 110 generates a flexible accompaniment based on the arrangement data transmitted by the control, and mixes and outputs the audio signal input through the microphone.

Here, the audio processor 110 implemented using a PCM sound source chip is a sound source for storing the PCM sound source chip 112 for generating an accompaniment digital sound signal and the sampling data of the PCM sound source chip 112. Sound source chip control CPU 111 for controlling the accompaniment generation of the PCM sound source chip 112 based on the data memory 113, the arrangement data transmitted by the main CPU 200, and the sound source chip control CPU 111 A sound source chip CPU memory 114 storing a sound source chip control program and data, an interface circuit 115 connecting data communication between the sound source chip control CPU 111 and the main CPU 200, An audio output unit 116 converts the digital sound signal of the PCM sound source ratio 112 into an analog sound signal, amplifies it, and mixes and outputs the audio signal of the user.

The operation and problems of the conventional video accompaniment system configured as described above are as follows.

First, when a key is selected by selection, the selection key signal is input to the main CPU 200 through the key interface unit 140, and the main CPU 200 receives the accompaniment data storage unit 150 based on the selection key signal. Select the accompaniment of the accompaniment stored in the music and read the arrangement data and lyrics data and graphics data for the background image, the arrangement data is transmitted to the audio processing unit 110, the lyrics data and the graphics data for the background image video processing unit 130 is sent for video processing.

Accordingly, the video processor 130 mixes the subtitles synchronized with the accompaniment data with the image forming the background screen and outputs the video signal.

And, the arrangement data transmitted by the main CPU 200 is input to the sound source chip control CPU 111 through the interface circuit 115, so that the sound source chip control CPU 111 uses the PCM sound source chip 112. To control. The PCM sound source chip 112 reads the sampling data of the sound source from the sound source data memory 113 according to the control signal based on the input arrangement data to generate digital sound, and the digital sound is used for the sound source chip control. The audio output unit 116 is output to the audio output unit 116 under the control of the CPU 111. The audio output unit 116 converts the digital sound into analog sound, amplifies it, and then mixes the audio signal input through the microphone. Output to the speaker.

However, in the audio processor 110, a separate sound source chip control CPU 111 is used, since most PCM sound source chips can receive only data of a predefined type according to the characteristics of each PCM sound source chip. Control by using a separate CPU. That is, the arrangement of the arrangement data transmitted from the main CPU 200 to the audio processing unit 110 is mainly in the form of standard arrangement data such as MIDI, or has a form of arrangement data defined independently in each video accompaniment system, This is because the PCM sound source chip 112 does not operate only with such arrangement data.

Accordingly, the sound source chip control CPU 111 receives the arrangement data transmitted from the accompaniment data storage unit 150 under the control of the main CPU 200 and transforms the arrangement data into a data form suitable for the PCM sound source chip 112. The sound source chip 112 may generate a digital sound source signal. In addition, in the case of some PCM sound source chip 112, the CPU for sound source chip control is responsible for the complicated calculation part that is difficult to process inside the sound source chip and the initialization control of the sound source chip.

As described above, in the image flexible accompaniment system using the PCM sound source chip, the entire system is initialized, and the arrangement data and the accompaniment data storage unit 150 are arranged based on the control of the key interface 140 and the video processor 130 and the selection key signal. The main CPU 200 is responsible for the overall processing (hereinafter, referred to as "first process") such as reading information (subtitle information) such as lyrics and background image graphics and transmitting them to the audio processing unit and the video processing unit, respectively. The control of the PCM sound source value ratio 112 and the process of converting the arrangement data to be processed by the sound source chip 112 and directly controlling the PCM sound source chip (hereinafter referred to as "second process") are sound source chips. It is in charge of the control CPU 111.

In addition, a separate CPU for controlling the video processor may be used to control the video processor 130.

Therefore, in the conventional image accompaniment system using the PCM sound source chip, a separate sound source chip control CPU 111 should be used for controlling the PCM sound source chip 112, and the main CPU 200 and the sound source chip control CPU 111 The interface circuit 115 for data communication processing should be added between the two and the necessary memory (ROM and RAM) must be provided for each CPU according to the use of two or more CPUs, so that the number of parts increases and the cost increases. There are many difficulties in implementing various circuit holders in one chip.

In addition, the CPU on the side sending data between the main CPU and the CPU for controlling the sound source chip must wait until the other side can receive the data, and the receiving side must postpone other control operations while receiving the data. There is a problem that a delay occurs, resulting in a slowing down of the overall system processing speed resulting in a performance degradation of the system.

SUMMARY OF THE INVENTION An object of the present invention is to improve the performance of a system by allowing the system to perform both the overall system control and the sound source chip control without using a separate sound source chip control CPU in a video accompaniment system using a PCM sound source chip. It is to provide an image flexible accompaniment system and a method of controlling the same, which can reduce the cost, cost and the number of parts.

The object of the present invention is to remove the interface circuit for communication with the main CPU and the memory of the sound source chip control CPU, the sound source chip control CPU in the video accompaniment system for generating audio sound using the PCM sound source chip. And a first processor which controls the video processing of lyrics subtitles and backgrounds as well as reading the arrangement data by initialization and selection of the entire system from the main CPU, and controlling the sound source chip based on the arrangement data according to the selection. By controlling the second process for controlling the generation of the signal by time division, and including an interrupt generating means for generating an interrupt so that the main CPU can time-division the first process and the second process at a predetermined time interval Is to be achieved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Key interface unit 140 for receiving the keyboard key selection key signal, accompaniment data storage unit 150 for storing the arrangement data for lyrics accompaniment and lyrics subtitles and background image in advance, and the entire system at power-on Control of initialization and reading video subtitle data such as arrangement data and lyrics based on the selection key signal, and controlling video processing, and controlling the sound source chip based on the arrangement data to control the generation of digital sound signals. The main CPU 200 which controls the image accompaniment by performing a second process, and interrupts the predetermined time interval so that the main CPU 200 can process the first process and the second process by time division. An interrupt generator 210 for generating a signal and an image flexible accompaniment control program to be processed by the main CPU 200 and an image flexible accompaniment system are required for operation. The main memory 120 for storing the program and data for the sound source chip control program and receiving the lyrics caption and the background image information under the control of the main CPU 200 generates the lyrics for the subtitle and the background image. The PCM sound source chip 112 for generating a digital sound signal based on the video processing unit 130, the arrangement data according to the second process control of the main CPU 200, and the sampling data of the PCM sound source chip 112. And an audio output unit 116 for amplifying the digital sound signal of the PCM sound source chip 112 by digital / analog conversion and mixing the same with a microphone input signal. have.

Here, the control flow of performing the first process and the second process by the time-dividing method in the main CPU 200 may include an initialization process of initializing each part of the system when the power is input to the room and tie shown in FIG. Subsequently, a first process process of reading arrangement data, lyrics subtitles, and background image graphic data based on the selection key signal input, and controlling video processing of the lyrics subtitles and background image graphics, and an interrupt generator during execution of the first process When an interruption is generated, the process of storing the present state of the first process in a first stack of the main memory, storing the present state of the first process, and generating a digital sound signal of the sound source chip based on the arrangement data. Restoring the previous state of the second process in the second stack storing the previous state of the controlling second process; A second process for performing two processes, and if an interrupt is generated from the interrupt generator during execution of the second process, storing the current state of the second process in a second stack of the main memory, and the second process. And storing the current state of the memory and performing a process of returning to the previous state of the first process stored in the first stack, and repeating the process after the first process based on the interrupt signal of the interrupt generator.

The main memory 120 is implemented with a RAM and a ROM, and the accompaniment data storage unit 150 is a mask-ROM, an EPROM, or a CD-ROM. ROM), and the interrupt generator 210 may be implemented as a timer for generating an interrupt signal at a predetermined time interval (for example, 2 mm sec).

Also, as shown in FIG. 3, the audio output unit 116 converts a digital sound signal (accompaniment signal) output from the PCM sound source chip 112 into an analog signal and the digital / analog 116a. The amplifying unit 116b for amplifying the output signal of the analog converter 116a, the accompaniment signal outputted from the amplifying unit 116b, and the user's voice signal input through the microphone 117 are mixed to prepare the audio output terminal 118. It consists of an audio mixer 116c to output through.

In the control processing of the image flexible accompaniment system according to the present invention configured as described above, the arrangement data, the lyrics and the subtitle image and the background image from the accompaniment data storage unit 150 are controlled in accordance with the selection key signal while the main CPU 200 controls the initialization of the entire system. A first process for controlling the video processing of reading the graphic data and subtitling the background image screen based on the lyrics subtitle and the background image graphic data; and the arrangement data as data that the PCM sound source chip 112 can accept. The second process for converting and controlling the generation of the digital sound signal of the PCM sound source chip 112 is controlled in a time-division manner based on the interrupt signal of the interrupt generator 210.

This is because the first process and the second process have a unique function, so that it can be controlled by a time division method.

However, if one of the processes occupies the main CPU 200 for a long time there is a risk that the other process is not performed smoothly. For example, when the control process of the sound source chip is slowed by about 5-10 mm sec due to the characteristics of the PCM sound source chip 112, the user may recognize that the accompaniment output is unnatural. When this is consumed, a situation in which the speed of responding to the keyboard connected to the key interface unit 140 is remarkably slowed or the correct accompaniment beat is not output may occur.

In order to overcome this point, the image accompaniment system according to the present invention can recognize the timing at which one image needs to be switched from one process to another so as not to affect the processing of the other processes. An interrupt generator 210 for generating an interrupt signal for notifying the main CPU 200, that is, a timer is provided.

Accordingly, when the interrupt signal is generated from the interrupt generator 210 during one process for controlling the image accompaniment, the main CPU 200 pauses the process currently being processed and performs another process. .

As described above, in order for the main CPU 200 to stop the process currently being executed by the interrupt signal and return to the previous process, the main CPU 200 needs to know the pause state of the previous process to return. Therefore, the memory area for storing the pause state of the process is returned. This is necessary.

That is, two main memories 120 each store the contents of all the registers of the CPU indicating the pause state of two processes, that is, the execution address of the interruption point and the state up to that point, as shown in FIG. It configures a stack of to store the current status of the process to be paused at the process transition, and to return to after the previous pause state stored in the stack assigned to the process to be returned when returning to the previous process.

Therefore, when the user supplies power to the video accompaniment system, the main CPU 200 controls the music accompaniment accompaniment in the same order as the control flow shown in FIG. 5 based on a program stored in the main memory 120. First, when power is applied, each part of the system is initialized. At this time, the initialization operation initializes all variables for performing the first process and the second process, and sets the interrupt generation time, which is the reference for the process switching, in the interrupt generator 210 to process the process switch interrupt. After the initialization, the first process is performed.

The first process scans whether a key selection key signal is input through the key interface unit 140, and if a key signal is input, stores the key signal, and if a start key signal is input, generates an address based on the stored key selection key signal. The data is read from the accompaniment data storage unit 150.

The arrangement data, the lyrics subtitles and the background image graphic data are read from the accompaniment data storage unit 150 to read the lyrics subtitles and the background image graphic data, and the video processing unit 130 is controlled based on the lyrics subtitles and the background image graphic data. To display a subtitle on the background image of the screen.

On the other hand, if a predetermined time (for example, 2 mm sec) elapses during the execution of the first process as described above, an interrupt signal is generated in the interrupt generator 210, and accordingly, the main CPU 200 is configured to execute the first process. The contents of all registers of the CPU indicating the current state, that is, the execution address at that time and the state up to that time, are stored in the first stack set in the main memory 120.

The previous state of the second process is then returned from the second stack. At this time, since there is no previous state at the time of switching to the first second process, the second stack should be stored in an appropriate state in advance during the initialization operation.

In the second process, the digital sound signal generation of the PCM sound source chip 112 is controlled based on the arrangement data read from the accompaniment data storage unit 150, which does not accept the arrangement data from the direct PCM sound source chip 112. Therefore, the PCM sound source chip 112 converts the control data into an acceptable control data and outputs it to the PCM sound source chip 112.

Accordingly, the PCM sound source chip 112 reads the sampling data stored in the sampling data storage unit 113 based on the control data output from the main CPU 200 to generate a digital sound signal of the corresponding accompaniment. The digital sound signal output from the PCM sound source chip 112 is converted into an analog signal by the digital / analog converter 116a of the audio output unit 17, amplified by the amplifier 116b, and then the microphone 117. The audio signal is mixed with the audio signal and is output as an audio signal.

In addition, if an interrupt signal is generated from the interrupt generator 210 after a predetermined time has elapsed during the execution of the second process, the main CPU 200 stores the state of the second process in a second stack and the first stack. The process returns to the previous state of the first process stored in the stack to perform the first process.

In this way, based on the interrupt signal generated by the interrupt generator 210 at predetermined time intervals, the main CPU 200 controls the PCM based on the first process and arrangement data for controlling the video processing such as data reading and subtitles according to key input. The second process for controlling the sound source chip is controlled in a time division manner.

As described in detail above, in an image flexible accompaniment system using a PCM sound source chip, a conventional video accompaniment is performed because the main CPU 200 controls both video processing and audio processing for controlling the PCM sound source chip by a time division method. The sound source chip control CPU used in the system, the memory of the sound source chip control CPU, and the interface circuit for data communication with the main CPU 200 are no longer needed, which simplifies the control circuit due to the component reduction rate and reduces the cost. In addition, there is also an effect that the ASIC (implementation of ASIC) to implement a variety of devices in a single chip.

In addition, despite the removal of each element described above, by using a time-division process switching technique by a timer interrupt, the system program used in an image flexible accompaniment system using a conventional PCM sound source chip can be modified according to the present invention. There is an advantage that can be used as a system program for the image flexible accompaniment system.

Claims (3)

Key interface unit 140 for receiving a selection key signal from the keyboard, Accompaniment data storage unit 150 for storing arrangement data and lyrics subtitles and background subtitle graphics for the accompaniment, and initialization of the entire system at power-on After control, the first process controls video processing by reading caption data such as arrangement data and lyrics based on the selection key signal, and the second process of controlling the sound source chip based on the arrangement data to control the generation of digital sound signals. A main CPU 200 that controls the image accompaniment by performing a process, and generates an interrupt signal at a predetermined time interval so that the main CPU 200 can process the first process and the second process by time division. An interrupt generation unit 210 for performing the operation, and a storage area for the operation of the image flexible accompaniment control program and the image flexible accommodating system to be processed by the main CPU 200. And a video processing unit for receiving lyrics subtitles and background image information under the control of the main CPU 200, and generating graphics for lyrics subtitles and background images under the control of the main CPU 200. 130 and a PCM sound source chip 112 for generating a digital sound signal based on the second process control according to the arrangement data of the main CPU 200, and storing the sampling data of the PCM sound source chip 112. A sound source data memory 113 and an audio output unit 116 for amplifying the digital sound signal of the PCM sound source chip 112 by digital / analog conversion, and mixing and outputting the mixed sound with a microphone input signal. Visual accompaniment system. The apparatus of claim 1, wherein the interrupt generator (210) is a timer for applying an interrupt signal to the main CPU (200) at predetermined time intervals. Initialization process of initializing each part of the system upon power input, and after the initialization process, read arrangement data and lyrics subtitles and background image graphic data based on the selection key signal input, and control video processing of the lyrics subtitles and background image graphics. Storing the current state of the first process in the first stack of the main memory when the interruption is interrupted from the interrupt generation unit during the first process, and performing the first process, and storing the current state of the first process; Performing a process of restoring the previous state of the second process in the second stack storing the previous state of the second process controlling the digital sound signal generation of the sound source chip based on the arrangement data, and performing the returned second process The second process, and if the interrupt is interrupted from the interrupt generator during the second process, the second process Storing the current status of the swap in the second stack of the main memory; and storing the current status of the second process and returning to the previous state of the first process stored in the first stack. And a process of repeating one or more process steps based on the interrupt signal generated by the interrupt generator.