MXPA00009239A - Method, device and entertainment system for generating playback sound - Google Patents

Abstract

A method and an electronic device for obtaining clear playback sound that is faithful to the original sound, in which image data and audio data are played back under control of a CPU (504), and in accordance with the played-back audio data, a timer (501), which generates a CPU interrrupt signal, is controlled and said interrupt signal is dynamically altered. The sound data obtained in accordance with the CPU interrupt signal is emitted to a speaker (447), thereby causing the timing of the sound data and the timing of the CPU interrupt signal to agree with each other, thus reducing the burden on the CPU (504), and generating a clear playback sound from the speaker (447).

Description

METHOD, DEVICE AND ENTERTAINMENT SYSTEM TO GENERATE PLAYBACK SOUND TECHNICAL FIELD This invention relates to a method wherein a clear reproduction sound that is true to the original sound can be made by dynamically modifying the period of interruptions with respect to the CPU, and an electronic device and entertainment system that implements this method.

BACKGROUND OF THE INVENTION In an information device such as an entertainment system as exemplified by a TV game machine, game data may be stored (saved) or read (loaded) from a memory card provided. In the use of such a memory card, the card is inserted into the main unit (main machine) of the information device. For this purpose, the memory card has an interface for connecting to the main unit (main machine) of the information device and a non-volatile memory element for storing data. Figure 1A is a block diagram of the key parts of such a memory card. This memory card 10 has a control unit 11 for controlling its operation, a connector 12 for connecting it to a mounting terminal provided in a slot of the information device, etc., which is the main unit, and a non-volatile memory 16. to store data. The connector 12 and the non-volatile memory 16 are connected by a control unit 11. The control unit 1 1, for example, is a microprocessor (labeled in this way in the diagrams). As a non-volatile memory 16, for example, a flash memory is used as an EEPROM (read-only, programmable and electrically erasable memory). Sometimes a microprocessor is also used in the connection interface with the information device of the main machine as the control unit to interpret the protocol. Figure 1 B shows the control elements in the control unit 11 of the memory card 10. The memory card has a connection interface 1 1 a in the main unit to connect it to the main unit (main machine) of the device of information, etc., and a memory interface 11 b for feeding and outputting data to and from non-volatile memory. A video game device stores game data, etc. in an auxiliary memory and has the function of reading them again, and the memory card 10 is used as an auxiliary memory of the video game device. Figure 2 shows an example of a video game device that uses a memory card as auxiliary memory. The main unit 2 of this conventional video game device 1 has a disk mounting unit 3, which is accommodated in an approximately rectangular housing and in the center of which an optical disk is mounted, which is a recording medium where the application programs for the video game are stored, a reset switch 4 to reset the game when desired, a power switch 5, a button to open 6, which opens the cover of the disk mounting unit, and two slots 7A and 7B, for example. The memory card 10, which is used as auxiliary memory, is mounted in the slots 7A and 7B, and data, as the result of the game executed in the video game device 1, is sent from a control unit (CPU) 19, which is integrated in the main unit 2, and recorded in non-volatile memory 16. Multiple operation devices can also be connected (controllers) not illustrated to said slots 7A and 7B, allowing multiple players to participate in competitive games, etc., simultaneously. Instead of the memory card 10 connected to the memory card slots 7A and 7B of the main entertainment system machine, it has been proposed that a portable electronic device having the function of running a TV set or other program can be connected so that it can be separated. This is, it has been proposed that at least part of a program or everything, such as a TV game, be downloaded, the program should run on its own, and if the program is a game where characters appear, it will have the function of being able to allow growth, etc. of the characters in the game. Said portable electronic device (secondary machine) can be used without modification as a portable information terminal, and having a communication unit with other devices (main machine or secondary machine), its range of applications as an information terminal can be expanded, thus allowing the stimulation of new demand for the entertainment system. Such a portable electronic device must have sound functions to produce music and sound effects in the portable electronic device by itself to run, separately and independently from the main machine, video games, etc. downloaded from the main machine when it has been separated from the main machine. On the other hand, the functions, size and price of a portable electronic device impose certain restrictions on the CPU and the sound system devices that it may have inside. Under these circumstances, it is desirable to obtain a sound that is a clear and faithful reproduction of the original sound integrated into the game program. Therefore, an object of the present invention is to provide in an electronic device a method for obtaining a clear reproduction sound that is faithful to the original sound. Another objective of the present invention is to provide sound functions in an electronic device by means of which sound reproduction faithful to the original sound can be obtained. Another objective of the present invention is to provide an electronic device having sound functions by which a reproduction sound which is faithful to the original sound can be obtained. A further object of the present invention is to provide an entertainment system having a portable electronic device having sound functions by which a reproduction sound which is true to the original sound can be obtained.

DESCRIPTION OF THE INVENTION The aforementioned objects of the present invention can be obtained by a method for generating the reproduction sound, wherein a CPU interruption signal changes dynamically in accordance with the sound data read, the timing between said sound data and the timing of said sound. CPU interrupt signal is made to correspond, sending said sound data obtained in connection with said CPU interruption signal to the speakers, and the clear reproduction sound is generated. Also, in the method for generating the playback sound, the period of the CPU interruption signal changes dynamically in accordance with the period of the read sound data, the timing between said sound data and the timing of said sound signal. CPU interruptions are caused to correspond to each other by sending said sound data obtained in connection with said CPU interruption signal to the speakers, and a clear reproduction sound is generated. Additionally, in the method for generating the reproduction sound, image data and audio data are reproduced under the control of the CPU, the timing unit that generates the interrupt signal of the CPU is controlled in accordance with the reproduced audio data, the interruption signal changes dynamically, the timing between said sound data and the timing of said CPU interruption signal is made to correspond to each other, and the load on said CPU is reduced, sending to the speaker said sound data obtained in accordance with with said CPU interruption signal, and clear reproduction sound is generated from said speaker. In addition, an electronic device according to the present invention comprises a timing unit that generates a CPU interrupt signal, a CPU unit that specifies the sound data by timing said interrupt signal, a D conversion unit, and / A, which converts said sound data into analogous signal, and a loudspeaker that emits sound corresponding to said analog signal, wherein said CPU unit controls said timing unit in accordance with the period of said sound data, dynamically changes the period of said CPU interruption signal, cause the timing of the switching of said sound data and the period of said CPU interruption signal correspond to each other, and generate a clear playback sound. An electronic device according to the present invention comprises a clock unit, a timing unit that is connected to said clock unit and generates an interrupt signal using a decreasing counter; an interruption controlling unit that is connected to said timer means; a CPU unit that is connected to said interruption controller means; a bus controller means that is connected to said CPU means; a D / A conversion means that is connected to said bus controller means; an amplification means that is connected to said D / A conversion means; and a loudspeaker that is connected to said amplification means, wherein said CPU means controls said decreasing counter based on the period of the sound data, generates said interruption signal, determines the sound data based on said signal of interrupts, emits sound data via said busbar controller and said amplification unit to said loudspeaker and generates a clear reproduction sound. Additionally, an entertainment system according to the present invention comprises a main machine that has the function of executing programs; a portable electronic device that is a secondary machine that is mounted so that it can be separated on said main machine, and an interface for making an electrical connection with respect to said main machine; said portable electronic device includes a timing unit that generates a CPU interruption signal, a CPU unit that specifies the sound data by timing said interrupt signal, a D / A conversion unit that converts said data from sound in a similar signal, and a loudspeaker that emits sound in accordance with said analog signal.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of a conventional memory card (secondary machine); Figure 2 shows the state in which the memory card of Figure 1 is mounted on a video game device (main machine); Figure 3 shows an entertainment system consisting of a video game device (main machine), a controller (secondary machine), and a portable electronic device (secondary machine); Figure 4 is a perspective view of an entertainment system in the state in which the portable electronic device (secondary machine) is mounted on the video game machine (main machine); Figures 5A, 5B and 5C are plan views, front and base, with respect to the portable electronic device; Figure 6A is a block diagram of a portable electronic device; Figure 6B shows the control elements of the control unit shown in Figure 6A; Figure 7A shows the sound generation function blocks for a fixed-period CPU interruption signal; Fig. 7B shows the sound generation function blocks for which the period of the CPU interrupt signal is determined based on the sound waveform; Figure 8A shows the relationship between the sound waveform generated by the sound generation function blocks of Figure 7A and the period of fixed period interruptions; and Figure 8B shows the relationship between the sound waveform generated by the sound generation function blocks of Figure 7B and a period of dynamically changing interruptions.

DETAILED DESCRIPTION OF THE INVENTION Complete entertainment system Figure 3 shows a general external view of the entertainment system in relation to the instrumentation mode. The entertainment system has a video game device (main machine) 1, a controller 20 that is connected to this video game device 1, and a portable electronic device (secondary machine) 40, which is connected in a way that can separating to the video game device 1 and is able to establish a data communication with the device with the video game device 1. The video game device (main machine) 1 shown in Figures 3 and 4 is configured to read application programs, for example, a game program recorded in a recording medium such as an optical disc, and executes the program in accordance with the instruction operations of the user Q'ugador de | game) by means of a controller 20. For example, by running the game, it mainly controls the progress of the game, screen control and audio control, etc. As shown in the perspective view of Figure 4, a main unit 2 of the video game device 1 has a disk mounting unit 3, which is arranged in an approximately rectangular housing and in the center of which is mounted a optical disc, such as a CD-ROM that has a recording medium to provide the video game and other application programs, a reset switch 4 to reset the video game at any time, a power switch 5, a power switch disk release operation 6 for performing the operation of mounting an optical disk, and two slots 7A and 7B.

The video game device 1 can be constructed so that it has application programs by means of a communication circuit, as well as from a recording medium. The portable electronic device 40 and the controller 20 can be connected so that they can be separated to the grooves 7A and 7B formed on the side of the housing. The game player can control the progress of the game using the controller 20. A memory card (symbol 10 in figure 2) can be mounted in slots 7A and 7B, in which the content of the executed game can be recorded (saved) and from which the content of a recorded game can be read. As shown in the lower half of Figure 3, the controller 20 has first and second operating units 21 and 22, a left button 23L and a right button 23R, a start button 24. a selection button 25, units of operation 31 and 32 that can perform analogous operations, an analog / digital mode selection switch 33 that selects the operation mode of operation units 31 and 32, and an LED display unit 34 to display the selected mode of operation. Within the controller 20 is a vibration mechanism (not shown) operating in analogous mode; it is constructed in such a way as to give the player the sensation of presence by the vibration controller 20, for example, in response to a scene in the video game.

By connecting the controllers 20 to the slots 7A and 7B respectively, two players can share this entertainment system. For example, a competition game can be played by two players. The number of slots 7A and 7B is not limited to two as is the case here. In an entertainment system constructed in this way, a portable electronic device 40 can be attached so that it can be separated from the main machine 1 of the entertainment system.

Portable electronic device (secondary machine) Figure 5 shows the portable electronic device 40, Figure 5A is a plan view, Figure 5B is a front view and Figure 5C is a base view. The portable electronic device 40 has a housing 401 and has an operation unit 420 for accessing various information, a display unit 430 consisting of a liquid crystal display (LCD), and a window 440 for performing the communication via a storage unit. wireless communication using, for example, infrared rays. Inside the housing 401, which consists of a top cover 401 a and a bottom cover 401 b, there is a substrate in which a CPU, a D / A converter, memory elements etc. are mounted. The housing 401 is shaped such that it allows insertion into the slots 7A and 7B of the main unit (main machine) of the entertainment system in the manner described in detail below.

A window 440 is provided at the other end of the housing 401, which has an approximately semicircular shape. The LCD 430 has about half the area of the upper cover 401a, which is part of the housing 401, and is located near the window 440. In the upper surface portion of the housing 401, an operation unit 420 has one or more operation buttons 421, 422 for making event inputs and making various choices, is formed on an upper cover 401a in the same manner as window 440, and takes about half the area on the opposite side of the part in where the window 440 is positioned. Also, the operation unit 420 is placed on the cover 410, which is pivotally supported on pivots 410a and 410b with respect to the housing 401. The operation buttons 421, 422 are arranged from the side of the upper surface towards the side of the lower surface of the cover 410 and the perforated cover 410. The operation buttons 421, 422 can be moved outside or inside with resp ecto to the upper surface portion of the cover 410 and are supported by the cover 410. The portable electronic device 40, which is inside the housing 401, has a substrate positioned opposite to the position of the cover 410, and also has interrupting pressure units in the upper part of the substrate. With the cover 410 closed, the interrupting pressure units are provided in positions corresponding to the positions of the operation buttons 421, 422. In this way, when the operation buttons 421, 422 are pressed, the switch units of pressure press the pressure switches as diaphragm switches.

Connection to the main machine As shown in figure 4, the portable electronic device (secondary machine) 40 can be connected electrically and mechanically, with the cover 410 rotated approximately 90 degrees or more and in the open state, inserting the part mainly covered by the cover within one or both slots 7A and 7B provided on the side of the main machine 1. By making an electrical connection with the main machine 1, a player can download to the secondary machine 40 all or part of the game program for TV that has been executed on the main machine. Then, the secondary machine (portable electronic device) 40 to which the game program has been downloaded can be removed from the slot 7A or 7B of the main machine 1, and the game can be executed separately and independently. After having executed the game to some degree, it can be reconnected to the main machine 1, return the progress data of the game to the main machine 1 (load it to it) and the rest of the game can run on the main machine 1 .

Configuration of secondary machine Figure 6 is a block diagram of portable electronic device (secondary machine) 40. Secondary machine 40 has a control unit 441, a connector 442, input units 421 and 422, a screen (LCD) 430, a clock unit 445, a non-volatile memory 446, a loudspeaker 447, a wireless communication unit 448 that functions as a data transmission and reception unit, a wireless reception unit 449, a battery 450, a power terminal of energy 451 and a diode 452 for an energy storage unit. The control unit 441, for example, is a microprocessor (labeled as such in the diagram). The connector 442 is a connection unit for connecting it to the slot of another information device as the main machine 1, and has a data communication function for sending and receiving data to and from the main machine 1. The input units 421 and 422 include operation buttons, etc., to operate a stored program. The 430 screen is a liquid crystal display (LCD), which is a display unit for displaying various information. The clock unit 445 is constructed so that it shows the time, for example, it can perform the time display on the screen 430. The non-volatile memory 446 is an element for storing diverse data. For example, a semiconductor memory element, such as a flash memory, in which the stored data remains even in the event of power failure can be used for the non-volatile memory 446. Therefore, the portable electronic device 40 can also be like a conventional memory card 10. Because the portable device 40 has a battery 450, a static random access memory (SRAM) can be used as non-volatile memory 446, that allows to feed and emit data at high speed.

Also, the provision of the battery 450 makes it possible to operate the device independently even when it is removed from the main machine 1. The battery 450 for example, can be a rechargeable secondary battery. With the portable electronic device 40 inserted into the video game device, the battery 450 supplies power from the video game device (main machine) 1. In this case, the power supply terminal 451 is connected to the terminal of the video game device. connection of the battery 450 via the reverse current prevention diode 452 and the power is provided when connected to the main unit 2 of the video game device. The wireless communication unit or means 448 is constructed in a manner that makes it possible to perform the data communication with another electronic device, etc., for example, infrared rays. The wireless reception unit 449 is a part that is constructed to have an antenna and demodulation circuit, etc. That is, it is the part that receives various data that is transmitted through the wireless broadcast. Loudspeaker 447 is constructed as a sound generation unit that generates sound in accordance with the program, etc. All the aforementioned parts are connected to a control unit 441 and operate under the control of the control unit 441. Figure 6B shows the control elements for the control unit 441. An ordinary memory card 10 only has a control interface. connection 41 a of the main unit to a main machine 1 and a memory interface 41 b for the feeding and emission of memory data. The portable electronic device 40 has, in addition to these interfaces, a deployment interface, an operation power interface, an audio interface, a wireless communication interface, and a clock operation (named from now on 41 c) and a program download interface 41 d. For example, in case the energy of the portable electronic device 40 is turned on, the control unit 441 performs the initialization of the operation confirmation, etc. of the portable electronic device 40 as a whole, subsequently executes the application program stored in a program memory 441a. By executing this application program, the control unit 441 controls the display 430, loudspeaker 447, etc. in accordance with the input operation performed by the player and controls the display of images and the generation of sound and music effects.

Sound interruption function With such portable electronic device 40, the sound and music effects that match the display of images are generated in accordance with the progress of the game. Figure 7A shows the details of control unit (microprocessor) 441, specifically with respect to the sound interruption function for the generation of sound effects, etc. Along with the sound interruption function, the control unit 441 has a clock unit 500; a timing unit 501, which is connected to this clock unit, has a decrementing counter 502 and determines the period of interruptions; an interrupt controller 503, which is connected to the timing unit; the CPU unit 504 that is connected to this interrupt controller unit and receives the interrupt signal; a busbar controller 505, which is connected to the CPU; and a D / A 506 converter that is connected to this busbar controller. An amplification unit 507 (AMP) is connected to the D / A converter 506, and loudspeaker 447 is connected to the AMP 507. The decrementing counter 502, where a certain number is established, decreases within the timer unit 501 by the signal of clock from the 500 clock unit, the prescribed interruption period is formed, and an interrupt signal is generated with respect to the CPU 504 via the interrupt controller 503; that is, interruption control is applied. The CPU 504 is connected to a memory (for example, the non-volatile memory 44b), where music or sound is recorded and if there is a request to generate a sound effect in this period of interruptions in the program being executed, it reads the sound waveform data and sets the value of the sound waveform data in the D / A converter 506 via bus controller 505. The sound waveform data in the digital format is they convert into values in analogous format in the D / A converter 506. This analog sound value is amplified by the amplification unit 507 at a suitable electric current value for the loudspeaker 447 and drives the loudspeaker. Figure 8A is a concept diagram explaining the relationship between the fixed interrupt period t and the sound waveform Sw. In general, to play music in the electronic device, to digitally reproduce a sound that originally forms a sine wave of analogous values, a rectangular wave is used that faithfully has a pattern after this sinusoidal wave. That is, the sound waveform Sw is formed by a rectangular wave (digital data) that closely approximates the original sound of the game program. The timing controller unit 501 sends an interrupt signal to the CPU 504 in a fixed period, and each time this is done the value corresponding to the sound waveform Sw read by the CPU 504 with this interruption timing is set in the 506 D / A converter. However, if the interruption period is set in this way, the sound waveform Sw and the interruption period t will be generated separately and independently, without correspondence or coordination between the two . As a result, the timing of the rise and fall of the rectangular wave that forms the sound waveform Sw and the timing of period t of interruptions will not match, and discrepancy will occur between the two timings. Due to this slight timing mismatch, the original sound recorded in the game program will not be reproduced faithfully. In such a case, when the spectrum of the sound emitted from the speaker 447 is analyzed by FFT (fast Fourier transformation), non-integer multiples of the fundamental frequency will be included in addition to the original sound (fundamental frequency), which for example is 440 Hz denoting the musical tone "do" and its multiple integrals (880 Hz, 1320 Hz, ...). Such sound that contains non-integral multiples of the fundamental tone sounds is very soft to the human ear. In this case, the period t of interruptions is the resolution with respect to the sound waveform Sw, so that the waveform of sound Sw can be reproduced with greater fidelity by producing a very short period of interruptions t. That is, it is possible to increase the probability that the rise and fall timing of the rectangular wave forming the sound waveform Sw and the timing of the interruption period t coincide. By shortening the interrupt period t, the CPU 504 will be subjected to an interruption with a much higher frequency, which will correspondingly increase the load on the CPU 504 executing other controls such as image control. Specifically, to address the balance between the demands on reproducibility of the sound waveform Sw and to reduce the interference on the CPU 504, the interrupt period t is usually set approximately 23 to 90 microseconds. But even with such a period of interruptions t, the position where the amplitude of the sound waveform Sw changes (the timing) will come out slightly from the original sound, resulting in a reproduction wave that is slightly out of the waveform original and generating a reproduction sound where the non-integral multiples of the fundamental tone are mixed. Therefore, it has been necessary to develop a method that can faithfully reproduce the original sound while reducing the load on the CPU 504 and a portable electronic device that can instrument this method.

Dynamic modification of the interruption period This invention has been conceived based on the discovery by the inventors that the original sound can be reproduced faithfully while the load on the CPU 504 is reduced by dynamically modifying (the timing), in accordance with the original sound, the interrupt period t with respect to the CPU 504. This is explained using Figure 7B. In the execution of the video program, when music, sound effects, or other sound generation information has been recorded in the game program, the CPU 504, via bus controller 505, sets the decreasing counter 502 of the timing unit 501 to a value that is determined based on the period T of this sound. For example, when the sound period is T, the decreasing counter 502 is set so that the interruption period t is T / 2. As a result, by the operation of the interrupt counter 502, the timing unit 501 generates an interrupt signal with respect to the CPU 504 with the interruption period t = T / 2. Figure 8B is a diagram explaining this situation. When the sound waveform Sw is T1, the interruption period t is generated at t = T «1/2. Similarly, when in the next step, the sound waveform Sw changes to T2, the interruption period t is generated at t = T «2/2. Dynamically modifying the interrupt period t in this manner based on the sound waveform data of the original sound, the discrepancy between the timing of the interruption period t and the timing of the rise and fall of the sound waveform Sw completely or almost completely eliminated. A further advantage of the present invention is that half period T / 2 of the sound waveform Sw is generally much greater than the usual fixed t break period. That is, the dynamic alteration of the interruption period t = T / 2 is much greater than the usual fixed interruption period, so that the frequency of generation of an interruption signal with respect to the CPU 504 is reduced, which reduces to a large extent the load on the CPU 504. Specifically, for a frequency sound of 1 kHz (period T = 1/1000 seconds), it is sufficient to have a frequency of interruptions of 2 kHz (period t = 1/2000 seconds = 500 microseconds). A much smaller number of interruptions and a greater interference reduction in the CPU 504 is obtained as compared to 23 to 90 microseconds in the case where the interruption period t is fixed. The resolution of the dynamic modification of the interruption period is finally equal to the resolution of the timing unit, so that the reproduction capacity of the sound waveform is the highest theoretically achievable. The result is a clear reproduction sound that is true to the original sound. Changing the interruption period t to 1/2 of the sound generation period is only an example of work, and it should be noted that even if it is 1/3, 1/4, ..., etc. of the sound generation period falls within the scope of the present invention while reducing the load on the CPU unit 504 by comparing it with a period of fixed period interruptions. The present invention is not limited to the portable electronic device in an entertainment system. It should be noted that this invention is technology that can be applied to all electronic devices that adopt the form of sound generation by generating an interruption signal with respect to the CPU 504. The present invention makes it possible to provide in an electronic device, a method by which a reproduction sound faithful to the original sound is obtained. The present invention also makes it possible to provide, in an electronic device, a sound function by which a reproducing sound faithful to the original sound is obtained. The present invention also makes it possible to provide an electronic device having a sound function by which a reproducing sound faithful to the original sound is obtained. The present invention also makes it possible to provide an entertainment system having an electronic device that has a sound function by which a reproduction sound is obtained which is faithful to the original sound.

Claims (14)

NOVELTY OF THE INVENTION CLAIMS

1. - A method for clearly generating a reproduction sound in an electronic device including a CPU and a loudspeaker, the method comprising the steps of: dynamically modifying an interrupt signal in a CPU in accordance with sound data that is read from the CPU memory; and outputting said sound data to a loudspeaker of the electronic device together with said interrupt signal of the CPU, wherein the timing between said sound data and the timing of said interrupt signal of the CPU is made to agree with each other for provide a clear reproduction sound.

2. A method to generate a clear reproduction sound in an electronic device that includes a CPU and a loudspeaker, the method comprises the steps of: dynamically modifying a period of a CPU interruption signal in accordance with a period of the data of sound that are read from the CPU memory; and outputting said sound data to the loudspeaker together with said CPU interrupt signal, wherein the timing between said sound data and the timing of said CPU interrupt signal is made to match each other to provide reproducing sound. Clear.

3. The method for generating playback sound according to claim 2, wherein in said step of modifying the period of the interrupt signal of the CPU is dynamically modified in correspondence with a period T of said sound data, the period of the CPU interrupt signal is modified dynamically and the period t of said CPU interruption signal is dynamically modified to T / n, where n = 2, 3, ...

4.- The method for generating reproduction sound of according to claim 2, wherein in said modification step the period of the interrupt signal of the CPU is modified dynamically in correspondence with the period T of said sound data, the period t of said interrupt signal of the CPU is modified dynamically at T / 2.

5. A method to clearly generate a clear reproduction sound, in an electronic device that includes a CPU, a timing unit and a loudspeaker, the method comprises the steps of: reading image data and audio data under the control of the CPU, and in accordance with said read audio data, generate by means of said timing unit a signal of CPU interruptions which are controlled; dynamically modify said interruption signal; outputting to the loudspeaker said sound data obtained in accordance with said CPU interruption signal, wherein the timing between said sound data and the timing of said CPU interruption signal is made to match, the load on the CPU is reduced, and a playback sound is generated from the speaker.

6. - An electronic device comprising: a timing unit that generates an interruption signal in the CPU, a CPU that specifies sound data by timing said interruption signal, a D / A converter that changes said sound data to an analogous signal, and a loudspeaker that emits sound corresponding to said analog signal; said CPU controls said timing means in accordance with a period of said sound data, dynamically modifying a period of said CPU interruption signal, causing a switching timing of said sound data and the period of said CPU interruption signal. to match, and generating a clear reproduction sound.

7.- The electronic device in accordance with the claim 6, further characterized in that the period of said CPU interrupt signal is dynamically modified to T / n (where n = 2, 3, ...) with respect to the period T of said sound data.

8.- The electronic device in accordance with the claim 7, further characterized in that the period of said CPU interrupt signal is dynamically modified to T / 2.

9. An electronic device comprising: a clock unit; a CPU; a decreasing counter; a timing unit connected to said clock unit and generating an interrupt signal using said decrementing counter; an interrupt controller connected to said timing unit; said CPU being connected to said interrupt controller; a busbar controller connected to said CPU; a D / A converter connected to said busbar controller; an amplification unit connected to said D / A converter; a loudspeaker connected to said amplification unit and an electronic means that causes said CPU to control said decreasing counter based on the period of the sound data, generates said interruption signal, determines the sound data based on said interruption signal , output the sound data by said busbar controller and said amplification unit to said horn, and generate a clear reproduction sound.

10. The electronic device according to claim 9, further characterized in that said CPU dynamically modifies the period t of said interruption signal to T / n (where n = 2, 3, ...) when the period of said sound data is T.

1 1. The electronic device according to claim 10, further characterized in that said CPU dynamically modifies the period t of said interrupt signal to T / 2 when the period of said sound data is T.

12. The electronic device according to claim 9, further characterized in that it is a portable electronic device that is connectable so that it can be separated to a main machine and can run a game independently when it is separated from said main machine.

13. - An entertainment system comprising a portable electronic device that is a secondary machine that is mounted so that it can be separated to a main machine, and an interface to make an electrical connection to said main machine, said portable electronic device comprises: CPU; a timer that generates a signal of interruptions in the CPU; said CPU specific sound data by timing said interrupt signal; a D / A converter that converts said sound data to an analogous signal; and a loudspeaker that emits the corresponding sound to said analog signal.

14. The entertainment system according to claim 13, which dynamically modifies the period of said interrupt signal from CPU to T / n (where T is a period of the sound data and n = 2, 3, .. .).