KR100434987B1 - Apparatus and method for generating beat bars using fft algorithm, and game machine using the same - Google Patents

Abstract

The present invention relates to a bit bar generating apparatus and method using an FFT algorithm, and a game machine using the same, comprising: a buffer 220 for temporarily storing sound data; When the entire frequency band is divided into a plurality of channels, the acoustic data stored in the buffer is analyzed using the FFT algorithm, the power value is calculated at each frequency point, and the power value satisfies a predetermined condition for each channel. A signal processor 261 for generating a bit bar; A display unit 262 for displaying the bit bar generated by the signal processor for each channel and scrolling the bit bar toward the reference line according to the control of the signal processor; And an interface unit 263 for a signal processor, a buffer, and a display unit; By overcoming the limitation of the place where you can enjoy the game only where the device is installed, which is the biggest disadvantage of acoustic simulation game machines such as the existing beat enthusiasts, the portable game machine has been overcome and overly dependent on the pre-stored data. You can overcome the limitations of data that you can't play games for new songs without the update.

Description

Apparatus and method for bit bar generation using FFT algorithm, and game machine using the same {APPARATUS AND METHOD FOR GENERATING BEAT BARS USING FFT ALGORITHM, AND GAME MACHINE USING THE SAME}

The present invention relates to a bitbar generating apparatus and method using the FFT algorithm, and a game machine using the same.

Game machines such as "Beat Mania", first developed in Japan in the late 90's when the dance music craze began to emerge, were successful in the field of sound simulation games, which later became Dance Dance Revolution (DDR) or Drum Mania (Drum). Mania) is reborn as a game that applies this. Beat Mania is a game that captures the moment when the beat-bar, which corresponds to a cheerful rhythm of music, scrolls through six channels to reach the baseline, with five corresponding keys and one scratch disc. To operate. However, these existing games are mostly developed for commercial use, or are developed only for computer game programs and can be played only at the place where the device is installed, and only limited to pre-programmed music and game data. Without the update, there is a limit of information that only the game of repetitive memorization of the same game content can be played at all times.

That is, in the conventional game consoles, when the first beat bar is generated and scrolled according to pre-programmed information and reaches a predetermined baseline, the music starts to be played and the music continues to be played, and the beat bar is also pre-programmed separately. The melody and the beatbar of the music are output in a roughly identical way as a separate independent state. Gamers simply watch the display while listening to music, and when the beat bar at a specific area reaches the reference line, the gamer is supposed to touch the corresponding keyboard or scratch disc.

Meanwhile, with the advent of the digital era, portable media devices are becoming more and more popular, such as CD players, MP3 players, and mini-disc, and various convenience devices are complex and multifunctional. The trend is to develop devices. Accordingly, the multimedia consumer desire of portable devices, which were recognized for their value as satisfying existing simple functions, is increasing, which is contributing to the emergence of multimedia elements of portable audio devices and their peripheral devices, which were faithful to existing music playback. New market prospects for the market.

However, in the conventional method, the beat bars and the melody of the music are output at all separately, and the beat bars that are actively matched are not generated from any music melody. Furthermore, the melody and the beat of the music are temporarily delayed by delaying the output of the music. Since the bars cannot be matched in real time, there was a problem that DDR games using this new portable audio device were impossible.

The object of the present invention is to overcome the limitations of location limitations and data limitations, which are the biggest disadvantages of the conventional acoustic simulation game machines as described above, and add a multimedia element of a portable audio device. In order to present a new prospect for the peripheral device market, DSP is used to analyze the frequency of the actual sound source through the portable audio device, and the FFT algorithm is used to actively generate a beat-bar in any music. It is to provide a device that can enjoy the game regardless of the place, such as a portable universal sound simulation game machine (hereinafter referred to as "Walking Beat") or karaoke that can be played anywhere.

Further objects and effects of the present invention will become more apparent from the following detailed description of the invention described with reference to the accompanying drawings.

1 is a waveform diagram showing a waveform of a beat tone.

2 is a spectrum showing an example of a music waveform.

3 is an example of bit generation by an FFT algorithm.

4 is another example of bit generation by the FFT algorithm.

5 is another example of bit generation by the FFT algorithm.

6 shows channel allocation and bitbar generation conditions.

7 illustrates bitbar generation and scrolling.

8 is an example of an actual appearance of a working bit.

9 is a schematic diagram showing the function of a working bit;

10 is a block diagram of a working bit.

11 is an internal structure diagram of a graphic LCD.

12 is a control command of the LCD module.

13 is a write timing diagram for LCD control.

14 is a read timing diagram for LCD control.

15 is a flowchart of a bitbar generation operation.

16 is an evaluation flowchart of a walking game.

17 is another example of the appearance of the working bit corresponding to FIG. 8;

18 shows an example of channel assignment on an LCD.

<Description of the symbols for the main parts of the drawings>

10: display unit 11: bit bar

12: reference line 13: game evaluation display unit

14: current score display unit 15: highest score display unit

20: key input section 21-25: operation button

26: scratch pad

100: sound device 200: working beat

210: A / D converter 220: buffer

230: time delay 240: D / A converter

250: analog compensator 260: bit generator

261: DSP 262: Graphic LCD

263: CPLD 264: flash ROM

262a: power supply circuit 262b: common driver

262c: Segment driver 262d: LCD panel

In order to achieve the above object of the present invention, a bit bar generator using an FFT algorithm according to an aspect of the present invention includes a buffer 220 for temporarily storing sound data; The entire frequency band is divided into a plurality of channels, and the FFT frequency analysis of the acoustic data stored in the buffer calculates a power value at each frequency point. When the power value satisfies a predetermined condition for each channel, A signal processor 261 for generating; A display unit 262 for displaying the bit bars generated by the signal processor for each channel and scrolling the bit bars toward a reference line according to the control of the signal processor; And an interface unit 263 for the signal processor, buffer, and display unit. Characterized in that it comprises a.

Preferably, the predetermined condition includes a first condition that is satisfied when the power value is greater than or equal to a first reference value for each channel, and a preset number (eg, three or more) of channels that satisfy the first condition are present. In this case, the second condition is satisfied when the power value in each channel exceeds a second reference value which is not smaller than the first reference value, and more preferably, the predetermined condition is a value of the channel corresponding to the low frequency. If so, be more strict.

On the other hand, the game machine using the bit bar generator using the FFT algorithm according to an aspect of the present invention for achieving the object of the present invention, having a bit bar generator from the sound data as the music data, stored in the buffer After delaying the sound data by the time required for the bit bar generation and scrolling, analog conversion is performed to output music in synchronization with when the bit bar reaches the reference line, and the key input signal is checked when the bit bar reaches the reference line. It is characterized by updating a score.

On the other hand, the bit bar generation method using the FFT algorithm according to an aspect of the present invention for achieving the above object of the present invention, the step of buffering the digital sound data (S104); Performing FFT analysis on the buffered data to calculate a power value for each point (S106); Determining a bitbar generation condition for each channel with respect to the power value (S108); Generating a bitbar for a corresponding channel when the bitbar generation condition is satisfied (S112); And displaying the generated bit bar and scrolling toward a reference line (S114). It characterized in that it comprises a, preferably, D / A conversion of the sound data as the time delay (S111) digital music data (S113); Reproducing music from the D / A converted signal in synchronism with the beat bar when it reaches a reference line (S116); And detecting a key input signal and updating a score when the bit bar reaches the reference line (S202-S204). To include more.

First, prior to describing the bit bar generator according to the present invention, a general bit tone will be described with reference to FIG. 1 is a waveform diagram showing a waveform of a general beat tone.

Pure Tones can be thought of as sinusoids with a single frequency. Multiplying the sinusoids of these pure tones with subtle differences in frequency produces an audio effect called a beat tone. This trembling phenomenon is audible at very small frequencies below 10 Hz and at frequencies near 1 KHz. Some instruments naturally produce beat tones. The beat tone is produced by the superposition of two sinusoids with adjacent frequencies, such as two adjacent piano keys. When there is a sum of sinusoids having two adjacent frequencies as in Equation 1,

Intermediate frequencies Defination frequency is much smaller than fc 2 frequencies each and It is expressed as Here, Equation 1 may be expressed as a product of two sinusoids using a sum of real parts of a complex exponential representation as in Equation 2.

For example, fc = 200 Hz, In the case of Hz, x (t) is expressed as in Equation (3).

That is, as shown in Equation 3, the signal has two sinusoidal components, Wow It is represented by the product of, and the result is shown in FIG. 1.

In Figure 1, the low frequency ( The envelope is determined by) and the fast frequency (fc) shows a change in amplitude within the envelope. like this, The change in the slow amplitude between the sum of the amplitudes and the difference by is called the beat. Our ears are like this Recognize the sound of Essier more strongly, the frequency of which is usually the average frequency to be. The effect of is to raise and lower the envelope so that the signal strength changes. When various instruments are played in real music, the tones are beaten in the adjacent frequency range, with the frequency spectrum showing a dense power.

Real music is a complex form of these sinusoids, which can be viewed as sinusoids with infinite periods. In a complex component waveform in which various instruments are played at the same time, instruments with different tones play similar notes in harmony with the rhythm by the score. This bit happens frequently, which means that the tone density for a similar frequency increases. This means that the frequency density increases in some frequency bands at one point in time. In particular, all music has a beat, and beat beats are generally expressed in instruments with lower voices, such as percussion, so the beat voice is expressed the most in this beat part, and the frequency density at this time is the highest in some frequency bands. do. Therefore, the bit-bar generation algorithm of the working beat game machine to be implemented in the present invention calculates the frequency power value of the music data analyzed by the FFT algorithm using such a bit phenomenon to determine the beat-bar for the rhythm identified as the bit phenomenon. The assessment level was set to be generated.

Now, the generation principle of the bit bar will be described with reference to FIGS. 2 to 7.

FIG. 2 is a spectrum showing an example of a music waveform, FIG. 3 is an example of beat generation by the FFT algorithm, FIG. 4 is another example of beat generation by the FFT algorithm, and FIG. 5 is another example of beat generation by the FFT algorithm. Another example.

In general, Fourier transforming a given signal f (t) as a function of continuous time t to a function of frequency ω makes it easy to know the frequency components included in the signal. If the Fourier transform of an arbitrary continuous signal f (t) is expressed as F (Ω), it is defined as in Equation 4 below.

Since it is not easy to express the continuous signal f (t) that we actually encounter, it is very difficult to analyze the frequency by Fourier transforming the continuous time signal. In general, the Fourier transform of a complex continuous signal waveform, which is difficult to express by a mathematical expression, is convenient by sampling a continuous signal and converting it into a discrete signal to obtain a frequency spectrum.

Given N discrete signals x (n) (n = 0,1,2, ..., N-1), the Discrete Fourier Transform (DFT) of x (n) is defined as in Equation 5 below.

Here, if the Twiddle Factor W_N is defined as Equation 6 below, Equation 5 is converted as Equation 7.

W _N = e ^{-j2π / N}

In order to calculate this N-point DFT, a multiplication operation of N × N = N ² is required. In other words, when the length of the input sequence is long, an exponential calculation amount is required. Against this backdrop A Fast Fourier Transform (FFT) algorithm is used which requires a computational amount of.

In this specification, DSP is used as the frequency analysis for generating the bit-bar, for example, a 40 KHz sampling rate and 256 points of FFT operations are software-processed.

On the other hand, in order to realize the present invention, in order to analyze the frequency of the music using the FFT algorithm of the actual music, an analysis task capable of grasping the characteristics of various music should be preceded. In particular, in order to actively generate beat bars for a variety of music, it is necessary to select a part of the beat where the beat phenomenon is mainly found through repeated frequency analysis operations for various music, and analyze the data. To this end, as an example, the waveform and frequency spectrum of a real time song sampled at 20 KHz 8 bit mono using a 'Cool Edit' program for about 8 seconds are shown in FIG. 2. In FIG. 2, FIG. 2 (a) shows a change in amplitude on the time axis, and FIG. 2 (b) shows a graphical representation of the frequency change and density with respect to the time axis in the frequency spectrum. The brighter the part, the higher the frequency density. As shown in FIG. 2 (b), the density is always distributed high in the low frequency region, and the high frequency density exists in part in some frequency regions. And it was found that the frequency components exist mainly at the beginning of the section of the score, and are gradually canceled. A common feature of these is that most music has a high frequency density for almost any time in the region below 500 Hz and few frequency components above 10 KHz. This means that there is no need to perform frequency analysis by performing an FFT operation over the entire 2 to 20 kHz region, which is an audible frequency region, for bit-bar generation. Therefore, in the present invention, the FFT operation is performed only for frequency components between 700Hz and 9KHz, which are frequently shown for generating bit-bars and can be classified according to characteristics, and the bit-bars are generated by using the generated FFT data. Was used.

As described above, all games such as beat enthusiasts use a method in which the beat-bar suitable for the beat of music is pre-made by the programmer considering only the game elements and then embedded in the device so that only the music and the time motives are expressed. Therefore, the game can be enjoyed only for the songs selected by the programmer, and game interest becomes less because the same bit-bar is always generated in the repeated game. However, the working beat game machine to be implemented in the present invention is to use the portable audio device as a sound source to generate a bit-bar actively in accordance with the sound source, which is possible through the frequency analysis using the FFT algorithm.

The basic algorithm that generates the bit-bar sets the frequency range to distinguish the frequency domain corresponding to the five channels through which the actual bit-bar scrolls even though the bit phenomenon occurs frequently. It is to determine whether the bit bar is generated in the corresponding channel. The respective reference values were probabilistically calculated using the data obtained through FFT calculation for various music. Of course, it is also possible to calculate the reference value based on other criteria according to the type of music. In particular, since the instrument uses the method of measuring the frequency power value of the FFT pointer for each frequency band in which the tones of each instrument are dominant, it is also possible to play a game such as music composed of various musical instruments such as orchestras or popular songs such as human voices. The element can actively generate many bit-bars. In the present invention, the method of measuring the frequency power value for the main frequency range of the equalizer, which is mainly used for the change of the sound according to the musical instrument tone, was used.

It is convenient to use the FFT algorithm for analysis of music data that can be represented as a superposition of complex sinusoids. In particular, the music data after performing the FFT operation using the DSP can be easily used to generate the beat-bar for the music we want because the power value is represented by a constant value for each frequency for each FFT pointer. In the present invention, 256 FFT operations are performed at 40 KHz, for example, to generate bit bars. Therefore, the frequency of each FFT pointer has a value of about 156 Hz as shown in Equation 8.

However, because the result of FFT operation is symmetrically opposite, only 128 FFT pointers for the actual 20 KHz are valid. In the present invention, as shown in Table 1, at the frequency of 700 to 9 KHz, the most bit of these is found. Bit-bars were generated using the FFT data for. Table 1 shows the number of FFT pointers and the corresponding frequency ranges for each channel.

The bit-bars are generated on a total of six channels, and five channels from the left incorrectly assign the number of FFT pointers for 700 to 9 KHz as shown in Table 1. This is because, in most cases, high density occurs frequently in the low frequency region due to the characteristics of the actual music, so that even distribution is mainly caused by the bit-bar only in the channel corresponding to the low frequency region. Therefore, by using the results of the FFT analysis on various kinds of music, weighting is performed so that an appropriately uniform beat-bar can be generated so as to increase the probability of generating the beat-bar in the frequency region where the beat phenomenon is less likely to occur. It was.

And the sixth channel on the right to operate using the scratch disc is when the 'condition 1' of the frequency power magnitude to determine whether to generate a bit-bar as shown in Table 2 is established in all five channels. To increase the game element. Whether or not to generate the bit-bars for five channels is given two conditions according to the magnitude of the power value of the point corresponding to each FFT pointer of the corresponding frequency range, and each condition is shown in Table 2 and Table 3 below.

As shown in Table 2, the five channels examine the second condition as shown in Table 3 when the power value in the corresponding FFT pointer is higher than the reference value. In this case, since the condition may be established in the place other than the time signature, it is determined that the condition 1 is satisfied only when there are three or more channels that satisfy the condition 1, and all 5 channels are satisfied. If it is satisfied, instead of generating all the bit-bars in each channel, only one bit-bar is generated in channel 6. If there are three or more channels that satisfy 'Condition 1', it is again determined whether 'Condition 2' as shown in Table 3 can be satisfied. In this case, the power value of each FFT pointer in the corresponding channel corresponds to If the reference value is met, the bit-bar is generated in the channel. However, because the frequency of the lowest frequency channel, 'Channel 1' (CH1), is very high, the weight is added so that the bit-bar can be generated only when two or more FFT pointer power values exceed the reference value.

FIG. 6 shows the frequency ranges, the number of points, and the power reference value of each channel assignment. The power reference value is a power reference value of 'condition 1' indicated by a dotted line (called 'first reference value') and a reference value of 'condition 2' indicated by a dashed line (shown as 'second reference value'). In general, although the first reference value is lower than the second reference value in the same channel, in the case of channel 1, the first and second power reference values of condition 1 and condition 2 are set to be the same. Instead, in the case of channel 1, in condition 2, the condition is still stringent compared to the condition 1 condition by allowing the condition to be satisfied when two or more power values exceeding the reference value in channel 1 exist. In addition, the power values are shown in the form of a bar graph at each point of each channel.

Looking at the conditions for the power value of the FFT calculation data discussed so far as an example. 3 to 5 show simulations of actual operation on a DSP using a computer's "Code Composer program", which shows each part of the actual music shown in FIG.

First, as shown in FIG. 3, since each FFT power value in five frequency intervals does not reach the first power value, it can be seen that even 'condition 1' is not satisfied. As described above, when three or more channels satisfying condition 1 do not exist, the bit-bar is not generated regardless of whether condition 2 is satisfied.

Referring to FIG. 4, since all five channels satisfy 'condition 1' (indicated by a small circle), the scratch channel 'channel 6' (CH6) is directly determined without determining whether or not the second condition is established. Generate a bit-bar.

In FIG. 5, channels 1, 2, and 3 (CH1, CH2, and CH3) satisfy 'condition 1'. As described above, when three or more channels satisfying condition 1 are examined, whether condition 2 is satisfied is checked. In the case of FIG. 5, the bit-bar is generated only in channel 1 because the channel satisfying 'condition 2' has only a frequency section corresponding to channel 1 (CH1) (the far left circle display portion).

The bit-bar generated by the above method is represented on the actual graphic LCD. As shown in FIG. 7, the bit-bars generated in six channels are generated at the bit-bar generating place and scrolled toward the baseline at the bottom of the channel at a constant speed. do. The leftmost channel shows the newly created bitbar, the centrally located channel shows the bitbar in the scrolling process, and the rightmost bitbar shows the case where the baseline has been reached. The delay time for scrolling from the bit bar generation place to the reference line is preferably about 3.9 seconds.

Finally, if the allocation of channels by each frequency interval is expressed in that order, the channel where the bit is generated may tend to be biased to one side, so that the user does not arrange the allocation of channels in order and mixes them as shown in FIG. It is advisable not to make it easy to lose interest.

Walking Beat's game method captures the moment when the beat bar reaches the base line while listening to music by pressing the switch assigned to each channel when the beat bar reaches the base line. The size, that is, the coordinate value of the bit-bar and the coordinate value of the baseline are compared to determine the score.

Now, hardware parts for actually implementing the present invention will be described with reference to FIGS. 8 to 11.

8 is an example of an actual appearance of the working bit, FIG. 9 is a schematic diagram showing the function of the working bit, FIG. 10 is a block diagram of the working bit, and FIG. 11 is an internal structure diagram of the graphic LCD.

The appearance of the working bit according to the present invention is as shown in FIG. In other words, the earphone output of the portable audio device is the input of the working bit, and the earphone is plugged into the working bit again. In particular, recently released portable audio devices use a method of plugging earphones into a remote controller, so a working beat game machine can be connected to receive input, and the earphone can be plugged into a working beat output terminal to listen again.

The main body is divided into the display unit 10 and the key input unit 20, and the key input unit includes operation buttons 21-25 and scratch pads 26 for each channel.

A more detailed hardware block diagram for directly implementing a working bit will be described with reference to FIG. 9.

First, the music data 100 input from the portable audio device is converted into a digital signal by the A / D converter 210 of the bit generator, which is called a working bit, according to the present invention, and is stored in the buffer 220. This is because the actual game method should be output through the earphone 300 in time synchronization with the music data generating the bit-bar when the beat-bar for music is first generated and scrolled to reach the baseline. For this, 8K bits of 128K data are stored by using an SRAM having a size of 64KWord for buffering for 3.9 seconds as an example of the actual bit-bar scrolling time, and after 3.9 seconds of time delay 230, the music data is again stored. It is converted into analog signal through D / A converter and output to earphone. Of course, if the music data 100 is digital data, the A / D converter 210 will not be necessary.

On the other hand, the music data stored in the buffer 220 is input to the bit generator 260 at the same time to generate a bit. 10, a bit bar is generated on the graphic LCD 262 by determining an FFT operation and a bit-bar generation condition using the DSP 261. To this end, timing generation for all interfaces such as the ROM 264, the RAM 220, the LCD 262, and the S / W is performed using a complex programmable logic device (CPLD) 263.

That is, referring to the working bit hardware architecture of FIG. 10, first, the 320C5402 DSP 261 operates as an external 10 MHz clock and an internal 100 MHz clock, for example, so that all operations such as an FFT operation may be performed without difficulty. Since the CPLD 263 is used as an input / output interface port, the circuit is simplified and unnecessary tasks of the DSP are reduced. The CPLD generates a control signal for controlling the RAM, the ROM, the ADC, and the DAC according to the memory map to manage the actual operation of each subdevice. In addition, it provides an input / output port to the graphic LCD, which is an output device, and serves as an encoder to check the input of the switch.

The DSP 261, the most critical component of the working bit, is available from Texas Instruments Co., Ltd. TI's DSP chips are classified into TMS320C2000 series, 3000 series, 5000 series, and 6000 series. The 3000 series are suitable for control systems, the 5000 series show low power performance, and the 6000 series have high processing power but are expensive. . Among them, TMS320C54x is preferable. Particularly, in the present invention, TMS320C5402 or TMS320C5416, which is one of 5000 series having low power characteristics and having a high speed and low cost, is preferable in consideration of a portable device.

DSP uses a portable audio device as the sound source to determine the bit-bar condition by performing the FFT (Fast Fourier Transform) operation on the frequency spectrum of the sound signal input to the buffer memory, and takes charge of graphic LCD control and basic operations. do. The basic firmware program code for driving DSP can use 32K bit flash ROM, and SRAM (Static RAM) is 64K Word size and it is used as a buffer for storing sound data passed through A / D converter. Music data is stored in 8-bit increments, resulting in a time delay of approximately 3.9 seconds.

The CPLD 263 serves as an interface. It allows eight bits of music data to be stored in SRAM, generates timing data to read codes and data from flash ROM, provides parallel ports for switches and graphic LCDs, and provides an interface for ADCs and DACs. The DSP generates eight CS signals with addresses 13, 14, and 15, and uses them as CS signals for decoding ROM and RAM and generating parallel ports for LCDs. It is also desirable to have six switch decoders internally for the six switch interfaces. The CPLD used in the present invention may be implemented as an EEPROM type PLD based on a 'Second-Generation Multiple Array MatriX (MAX)' structure as a MAX7000 product of ALTERA.

The memory map allocates the memory area to two pages from 0 to FF for RAM, and the data area from 0 to 7FFF to the code area from C000 to FFFF to read codes and data stored in ROM. In the I / O area, it is recommended to first assign 8000 to the 6-bit flip-flop structure for the LCD control command, and have the 8-bit flip-flop structure to the LCD data using the 9000 address. Address A000 has 8-bit flip-flop structure for DAC, ADC assigns address B000 to 8-bit 3-state structure, and finally 6 switches use 6-bit 3-state structure to use C000 address. Good to do.

The graphic LCD 262 may use HG12605NG with 128 × 64 DOT, which is one of the most commonly used LCDs. The LCD uses the KS0108B, a 64-channel segment driver used in dot matrix LCDs as an LCD controller.

As shown in FIG. 11, the internal structure includes a power supply circuit 262a, a common driver 262b, a segment driver 262c, and an LCD panel 262d, and a 1/64 duty cycle and a BIAS are 1 / 6.7. Since LCDs are typically too slow to operate at 1000 ns, it's a good idea to create an 8-bit parallel port with the 74HC373's 8-bit latch using CPLD to control this. This parallel port is designed to allow the DSP to easily control signals for controlling the LCD using the port of the CPLD. The parallel port is designed so that data actually written to the LCD is transferred directly through the DSP data bus.

Control commands of the LCD module used in FIG. 11 are shown in FIG. 12. 13 illustrates a write timing diagram for LCD control and FIG. 14 illustrates a read timing diagram for LCD control. However, this is for reference only, and anyone skilled in the art will be able to configure such a control command.

Other peripheral circuits include a reset circuit for low active reset of the DSP. The internal DSP can operate up to 100 MIPS using the 10MHz crystal 265 and the PLL inside the DSP. Even if it works, you can use 20MIPS. An oscillator circuit is required to use the oscillator and the crystal simultaneously. When the oscillator is not used, a 10MHz oscillation is performed using the crystal.

The six keypads used for actual games are designed to be 'high' input when 'off', 'low' input when 'on', and eliminate chattering that may occur during switching operations. In order to bypass the capacitor, it is recommended to bypass the capacitor.

Now, the bit bar generation method using the FFT algorithm according to the present invention will be described with reference to FIGS. 15 and 16.

First, as shown in FIGS. 9, 10, and 15, when the bit bar generation method using the FFT algorithm according to the present invention starts, first, the A / D converter 210 converts the music data 100 to A / D. D is converted (S102), and the converted digital data is stored in the buffer 220 (S104).

At the same time as the time delay 230 is stored in the buffer (S111), the bit unit generator 260 performs FFT analysis on the stored data to calculate a power value for each point (S106). Then, the bit bar generation condition for each channel is determined (S108), and whether the bit bar generation condition is satisfied (S110), and if the condition is satisfied, the bit bar is generated for the corresponding channel (S112), which is a graphic LCD (Fig. 10, 262), it scrolls toward the reference line (see FIG. 7) (S114).

Meanwhile, the time-delayed (S111) digital music data is D / A-converted by the D / A converter 240 (S113) and the analog compensator is made by the analog compensator 250 (S115). When the reference line is reached, the earphone 300 generates music in synchronization (S116).

17 shows another embodiment of the game machine according to the present invention. In this embodiment, there are five channels. That is, the scratch pad channel CH6 does not exist. In the case of six channels, the button must be operated with both hands. However, in the present embodiment, it is convenient to hold the game machine with one hand and click the button with only the other hand. Also, it is composed of a display unit 10 showing a bit bar 11 generation of each channel and scrolling to the reference line 12 and a key input unit 20 having operation buttons 21-25.

The display unit 10 includes a game evaluation display unit 13 for simply evaluating and displaying a game result, a current score display unit 14 for displaying a current score, and a highest score display unit for displaying the highest score so far ( It is desirable to have 15) to add interest to the game.

In this embodiment, since channel 6 of the previous embodiment corresponding to the scratch pad does not exist, even if condition 1 is satisfied in all channels as in the case of FIG. 4, condition 2 is determined again and condition 2 is satisfied. If a channel exists, a bit bar is generated for that channel. In FIG. 4, since channel 1 and channel 5 satisfy condition 2, bit bars are generated in two channels.

Fig. 16 shows a flowchart of the game operation of the game machine according to the present invention.

As shown in FIG. 16, when a gamer playing a game while listening to music clicks a button of a corresponding channel when the beat bar reaches a baseline (S202), the game machine updates the current score (S204) and the music ends. This is repeated until (S202-S206). When the music is finished, the current score is evaluated and displayed on the display (S208). If the current score is determined to be higher than the highest score up to now (S210), if it is high, the highest score is updated (S212) and the game ends. do.

Although the present invention has been described above with reference to one embodiment shown in the accompanying drawings, the present invention is not limited thereto, and various modifications may be made within a range easily understood by those skilled in the art. Therefore, the limitation of the present invention should be limited only by the following claims.

As described above, according to the apparatus and method for generating a bit bar using the FFT algorithm according to the present invention, and a game machine using the same, the game is played only where a device, which is the biggest disadvantage of the acoustic simulation game machines such as the existing beat enthusiast, is installed. Overcoming the limitation of the place to enjoy by implementing a portable game device, frequency analysis using the FFT algorithm to overcome the limitation of the data that can not play the game for a new song without a separate update based entirely on the pre-stored data We designed and implemented a working beat game machine that generates active bit-bars.

In addition, since the working beat game machine implements a bit bar that has a strong game element for all possible music, the user can directly determine the difficulty of the game according to the music. In other words, music such as dance songs and rock, which frequently develop beats, can be played more difficult games because many beat bars are generated, and games that are easier to play with monotonous instruments such as quiet ballad songs or piano songs. Enjoy. In particular, it can be considered that the application potential is very high because it responds to all sounds having frequencies such as speech data such as speech or news, not the music, or sounds of the surrounding environment using a microphone.

In addition, the walking beat game machine implemented in the present invention can be extended to a game called a walking dance (Walking Dance). Walking dance is a portable scaffolding board that attaches to the working bit's expansion slot by using the working bit algorithm, such as DDR (Dance Dance Revolution), a game in which beat enthusiast games are combined with dance. Think about it. In other words, the existing DDR game is also an application game that has a different expression format to algorithms similar to bit enthusiasts, so it is possible to use this to make the gaming platform portable and replace the switch of the working bit, and to display the LCD display and the bit-bar generation method. You only need to make a few modifications.

In conclusion, until now, the purpose of the portable audio device has been satisfied simply by listening to music. But with the revival of the digital age, portable audio devices are no longer able to meet the needs of consumers simply by meeting existing simple listening objectives. Accordingly, it is possible to develop and develop a multi-media device equipped with complex features and complex functions other than a simple listening purpose through a peripheral device such as a working bit according to the present invention. Along with the potential for growth of these new acoustical peripherals, it can also suggest the potential for a wider market for acoustical peripherals.

Claims (6)

A buffer 220 for temporarily storing digital sound data; The entire frequency band is divided into a plurality of channels, and the FFT frequency analysis of the acoustic data stored in the buffer calculates a power value at each frequency point. When the power value satisfies a predetermined condition for each channel, A signal processor 261 for generating; A display unit 262 for displaying the bit bars generated by the signal processor for each channel and scrolling the generated bit bars toward a reference line according to the control of the signal processor; Time delay means (230) for delaying the output of the sound data stored in the buffer so that the scrolled bit bar can reach the reference line in synchronization with the time point at which the sound data temporarily stored in the buffer is output; A D / A converter 240 for converting the digital sound data delayed by the time delay means into an analog signal to output music; And An interface unit 263 for the signal processor, buffer, and display unit; Bit bar generator characterized in that it comprises a. The method of claim 1, The predetermined condition includes a first condition that is satisfied when the power value is greater than or equal to a first reference value for each channel; A second condition satisfied when a power value in each channel exceeds a second reference value not smaller than the first reference value when there are more than a predetermined number (for example, three) of channels satisfying the first condition Bit bar generator, characterized in that consisting of. The bit bar generator according to claim 1 or 2, wherein the predetermined condition is more stringent in the case of a channel corresponding to a low frequency. And having a beat bar generator from the sound data as music data according to claim 1 or 2, After delaying the sound data stored in the buffer by the time required for the bit bar generation and scrolling, analog conversion is performed to output music in synchronism with the time when the bit bar reaches the reference line, and the key input when the bit bar reaches the reference line. The game machine characterized by updating a score by checking a signal. Buffering digital sound data (S104); Performing FFT analysis on the buffered data to calculate a power value for each point (S106); Determining a bitbar generation condition for each channel with respect to the power value (S108); Generating a bitbar for a corresponding channel when the bitbar generation condition is satisfied (S112); Displaying the generated bitbar and scrolling toward a reference line (S114); Delaying the output of the sound data stored in the buffer so that the scrolled bit bar reaches the reference line in synchronization with a time point at which the temporarily stored sound data is output in the buffering step (S111); And D / A converting the sound data as the digital music data delayed (S111) into an analog signal (S113); Bit bar generation method comprising a. The method of claim 5, wherein Reproducing music from the D / A converted signal in synchronism with the beat bar when it reaches a reference line (S116); And Detecting a key input signal and updating a score when the bit bar reaches a reference line (S202-S204); Bit bar generation method characterized in that it further comprises.