US 2006/0137515 A1Published application

Memory access controller for musical sound generating system

AssigneeYamaha Corporation

InventorsRyuichi Kawamoto, Masahiro Shimizu

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Abstract

In an access controller provided for a musical sound signal generating system, a signal generating section operates when a readout of wave data of one block stored in a working memory is completed in a sound channel, for supplying a next waveform request signal to a CPU, which requests a next block of the wave data for the sound channel. First and second buffer memories are connected between a recording medium and the working memory respectively through first and second buses which are independent from each other. A first transmitting section operates when receiving block specifying information from the CPU, which specifies a block to be read next from the recording medium, for transmitting the wave data of the specified block to either of the first or second buffer memory while reading the specified block of the wave data from the recording medium. A second transmitting section operates when the transmitting of the wave data to either of the first or second buffer memory is finished and during a period when the musical sound signal generation system is not accessing the working memory, for transmitting the wave data of the specified block to the working memory from either of the first or second buffer memory, to which the wave data of the specified block has been transmitted by the first transmitting section.

Claims7

Dependent claims

An access controller apparatus for use in a musical sound signal generating system having a first recording medium for storing wave data in units of a block having a predetermined size, a control section for determining a block to be read next from the first recording medium, a second recording medium for storing the wave data and having an access speed faster than that of the first recording medium, and a musical sound signal generation section for reading the wave data from the second recording medium at a speed corresponding to a reproduction rate of each sound channel to thereby generate a musical sound signal through each sound channel, the access controller apparatus comprising:

a next waveform request signal generating section that operates when a readout of the wave data of one block stored in the second recording medium is completed in a sound channel, for supplying a next waveform request signal which requests a next block of the wave data for said sound channel, to the control section;
first and second buffer memories connected between the first recording medium and the second recording medium respectively through first and second buses which are independent from each other;
a first transmitting section that operates when receiving block specifying information from the control section, which specifies a block to be read next from the first recording medium, for transmitting the wave data of the specified block to one of the first and second buffer memories while reading the specified block of the wave data from the first recording medium;
and
a second transmitting section that operates when the transmitting of the wave data to said one of the first and second buffer memories by the first transmitting section is completed, and during a period when the musical sound signal generation section is not accessing the second recording medium, for transmitting the wave data of the specified block to the second recording medium from said one of the first and second buffer memories, to which the wave data of the specified block have been transmitted by the first transmitting section.

2 more elements

An access controller apparatus for use in a musical sound signal generating system including a first recording medium for storing wave data, a second recording medium for storing the wave data and having an access speed faster than that of the first recording medium, a transmitting section for reading the wave data sequentially in units of a data block composing a part of the wave data from the first recording medium to thereby transmit the wave data to the second recording medium, and a musical sound signal generating section having a plurality of sound channels each of which reads the wave data from the second recording medium at a speed corresponding to a reproduction rate of each sound channel to reproduce a musical sound signal according to the read wave data, the access controller apparatus comprising:

a detecting section that detects a sound channel which will complete the reproducing of the data block stored in the second recording medium at the earliest timing among the sound channels capable of reading a next data block which should be transmitted to the second recording medium, based on the reproduction rates of the respective sound channels;
and
a sound channel specifying section that specifies the sound channel detected by the detecting section as a sound channel for which the transmitting section should transmit the next data block to the second recording medium.

A musical sound signal generating method performed in a musical sound signal generating system having a first recording medium for storing wave data, a second recording medium for storing the wave data and having an access speed faster than that of the first recording medium, a transmitting section for reading the wave data sequentially in units of a data block composing a part of the wave data from the first recording medium to thereby transmit the wave data to the second recording medium, and a musical sound signal generation section having a plurality of sound channels each of which reads the wave data from the second recording medium at a speed corresponding to a reproduction rate of each sound channel to reproduce a musical sound signal according to the read wave data, the musical sound signal generating method comprising:

a detecting step of detecting a sound channel which will complete the reproducing of the data block stored in the second recording medium at the earliest timing among the sound channels capable of reading a next data block which should be transmitted to the second recording medium, based on the reproduction rates of the respective sound channels;
and
a sound channel specifying step of specifying the sound channel detected in the detecting step as a sound channel for which the next data block should be transmitted to the second recording medium by the transmitting section.

Dependencies are inferred from the claim text.

Facts

Application: 11/318,313Filed 23 Dec 2005
Priority: JP 2004-37878528 Dec 2004
Published: 29 Jun 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G10H 1/183
Selecting circuits: channel-assigning means for polyphonic instruments
G10H 7/004
Using a common processing for different operations or calculations, and a set of microinstructions, e.g. programs, to control the sequence…
G10H 2230/031
Computing or signal processing architecture features: use of cache memory for electrophonic musical instrument processes, e.g. for improving…
G10H 2230/041
Computing or signal processing architecture features: processor load management, i.e. adaptation or optimization of computational load or data…