Abstract: An audio signal processing apparatus in which different pieces of predetermined parameter information regarding acoustic transfer in a head of a listener are retained as preset candidates, a parameter information list including the retained preset candidates is presented, to prompt a user to select parameter information, and an audio signal for the user is generated by using the user-selected parameter information.

Abstract: A DMA controller controls DMA transfer in an information processing system. Input and output devices are a transfer source or a transfer destination in DMA transfer and request DMA transfer. A DMAC activating unit is provided with an event monitoring unit and an event register. The event register registers an event subject to monitoring. The event monitoring unit detects an event generated in the input and output devices and determines whether the detected event matches an event registered in the event register. If it is determined that the events match, the event monitoring unit activates the DMA controller.

Abstract: There is provided an information processing apparatus in which a CPU and an audio processing unit are coupled by a bus. The audio processing unit includes a ring buffer that temporarily retains audio data, and performs an input/output process of the audio data. An interrupt signal generator generates a buffer empty signal, when the audio data is output from a buffer in the ring buffer and the buffer is empty, decimates the buffer empty signal in accordance with a sampling frequency of audio, and then feeds the interrupt signal that survives the decimation to the CPU. The CPU, upon receiving the buffer empty signal, issues a DMA transfer instruction for writing the audio data into the empty buffer in the ring buffer.

Abstract: A graphic memory is space-divided into a first area and a second area. In the first area, a task corresponding to a predetermined application is executed regardless of which task is processed by a main processor. A switchable area is divided in time so that data related to tasks corresponding to a plurality of applications is sequentially stored in the switchable area in accordance with task switching in the main processor.

Abstract: A DMA controller controls DMA transfer in an information processing system. Input and output devices are a transfer source or a transfer destination in DMA transfer and request DMA transfer. A DMAC activating unit is provided with an event monitoring unit and an event register. The event register registers an event subject to monitoring. The event monitoring unit detects an event generated in the input and output devices and determines whether the detected event matches an event registered in the event register. If it is determined that the events match, the event monitoring unit activates the DMA controller.

Abstract: A graphic memory is space-divided into a first area and a second area. In the first area, a task corresponding to a predetermined application is executed regardless of which task is processed by a main processor. A switchable area is divided in time so that data related to tasks corresponding to a plurality of applications is sequentially stored in the switchable area in accordance with task switching in the main processor.

Abstract: A tone generation device includes a computation unit which consists of multiple computation devices, a sheet music data analysis unit which reads data from a sheet music data holding unit and a waveform data holding unit and computes the sum total of the amount of processing based on this data. The tone generation device further includes a computation processing allocation instruction unit, a computation unit processing procedure holding unit and a processing routine holding unit. Based on the computed sum total of the amount of processing, the computation unit processing allocation instruction unit determines the amount of processing for each computation device so that it is an amount of processing that matches the capacity of each computation device, and sets a processing procedure in accordance with the determined amounts of processing. The set processing procedure is held in the computation unit processing procedure holding unit.

Abstract: It is an object of the present invention to, in the music data processing apparatus, reduce the complex processings in each of the computing units and access to the shared region of the main memory unit and to generate more efficiently the music data. According to the music data processing apparatus, the computing units (31) to (33) of the operating device unit (2) perform specified operations on data necessary for generating music that is stored in a main memory (3) and store “1” as the respective flags indicating the completion of the operating process in a synchronization notification information designating part (9) of the main memory (3).

Abstract: The present invention provides a sound source controlling device in which the processing load required for interpretation of music data may be varied, depending upon the CPU load. The interval of music data interpretation is changed, without changing the music data itself, and the reproduced music composition is not changed in tempo. A system load judgment unit 152 compares the system load information acquired by a system load information acquisition unit 151, with a threshold value stored in a system load threshold value holding unit 153, and accordingly selects a timer interrupt interval held by a timer interrupt interval holder 131. A time information supervisor 143 supervises the acquisition of music paper data held by a music paper data holder, responsive to the timer interrupt interval held by an internal resolution holder 145. A sound enunciation/sound erasure information controller 144 controls a sound source based upon the acquired music paper data.