Junichi Fujimori

Musical tone generating apparatus

A musical tone generating apparatus includes a position information generating device to generate musical instrument position information (PS) as plane coordinates values. This information (PS) is stored in a memory device, or selectively determined by a manual operation. The apparatus also includes an information converting device to convert information (PS) into musical tone parameter control information (PD). This control information (PD) controls musical tone source signals (S11, S12, and S13) to generate a sound field corresponding to the position of musical instruments arranged on a stage. This enables an operator to verify the musical instrument positions on a stage, thereby providing a feeling of being at a live performance.

Sound localization control apparatus

A sound localization control apparatus is used to localize the sounds, which can be produced from a synthesizer and the like, at a target sound-image location. The target sound-image location is intentionally located in a three-dimensional space which is formed around a listener who listens to the sounds. The sound localization control apparatus at least provides a controller, a plurality of sound-directing devices and an allocating unit. The controller produces a distance parameter and a direction parameter with respect to the target sound-image location. The allocating unit allocates acoustic data (e.g., two-channel binaural signals), representing the sounds to be localized, to the sound-directing devices in response to the distance parameter and the direction parameter. Each of the sound-directing devices is applied with each of predetermined sounding directions which are arranged in a horizontal plane with respect to the listener. Thus, each sound-directing device performs a data processing on the acoustic data allocated thereto so as to eventually localize the sounds in each of the predetermined sounding direction. At least three sounding directions are required when localizing the sounds. The sound-directing device can be configured by a finite-impulse response filter.

Tone effect imparting device

Tone signals from plural keyboard systems are supplied to an effect imparting circuit via a distribution circuit. The effect imparting circuit comprises plural effect imparting channels and the device can impart a tone effect independently to a tone signal provided to each of the effect imparting channels. The distribution circuit distributes tone signals from the respective keyboard systems to any one or more of the effect imparting channels. An effect selection device is provided for selecting tone effects for the respective keyboard systems and an effect assignment device is also provided for assigning the effects selected in the respective keyboard systems to any of the effect imparting channels according to the selection by this effect selection device. The distribution circuit delivers the respective tone signals to the proper effect imparting channels respectively as controlled by the effect selection and the effect assignment. Thus small number of effect imparting channels are used for impartation of versatile effects.

Sound image localization control device for controlling sound image localization of plural sounds independently of each other

Processing systems corresponding to the right and left channels are provided for applying independent sound image localization control to each of plural input sound signals on the basis of at least individual amplitude coefficients and delay information for the right and left channels that are separately provided for each of the input sound signals. The same sound signals are distributively input to each of the processing systems. Each of the processing systems comprises a delay line providing plural delay stages, a coefficient operator for arithmetically operating each of the input sound signals with the individual amplitude coefficient separately provided therefor, and an input circuit for additively inputting the sound signals, having been arithmetically operated by the coefficient operator, to the delay line at the respective delay stages corresponding to the individual delay information, so that the sound signals input to the respective delay stages are gradually mixed together while being sequentially delayed, so as to ultimately output a single sound signal that is a mixture of the plural sound signals arithmetically operated with the amplitude coefficients. Further, with respect to one of the input sound signals, two operation units each including a coefficient operator and an input circuit are assigned as the right channel operation units, and similar two operation units are assigned as the left channel operation units. Also, time-variation of sound image localization can be achieved.

Musical tone generation apparatus utilizing pitch dependent timing delay

An electronic musical tone generating apparatus includes a tone pitch designating unit for generating pitch signal representing tone pitch, a tone generation instruction unit for generating start signal instructing tone generation, a musical tone signal generating unit for generating a pair of musical tone signals representing a pair of direct sounds and a plurality of musical tone signals each representing a reflect sound in accordance with the start signal, wherein there can be difference of tone volume between respective musical tone signals of the pair of musical tone signals, and differences of tone volume and tone generation timing between respective musical tone signals of the plurality of musical tone signals, a controlling unit for controlling the difference of tone volume and the difference of tone generation timing in accordance with the pitch signal of the tone pitch designating unit, and a converting unit for converting the musical tone signals to musical sound.

Multichannel high sampling rate 1‐bit audio with a high definition video recorder system

Ideally, as much audio, video, and metadata information as possible should be acquired to produce archives using the most advanced technology available at the time so that maximum information can be inherited. On the other hand, it is not easy to develop both audio technology and video technology simultaneously or even to integrate them. For example, because we specifically examine audio technology, it is desirable to use video products in the market to achieve the goal. In this sense, we propose the use of IEEE1394 equipment and synchronize their components for integration. We developed a high sampling rate 1‐bit audio AD/DA converter that is equipped with IEEE1394 and recording and playback software running on Linux. The software can synchronize a 1‐bit audio stream using MPEG‐TS of HD video to extend its audio quality using IEEE1394 isochronous streaming with 125‐Es resolution. This integration of audio and video is achieved without modifying existing video products. This paper describes the system and...

Digital signal processing aspects of digital musical Instruments

Digital signal processing techniques are being widely used in electronic musical instruments and their accessories. Todays digital musical instruments provide a greater variety of sounds and a more precise control than ever before. However, these instruments lack intuitive, direct controls making them difficult for most musicians to use. Two possible approaches are being considered to reduce their complexity. One is to utilize a powerful MPU for controlling the parameters of the digital signal processing, and the other is to find models of digital signal processing that arc specific to music. In this paper, several techniques are surveyed, especially as applied to musical activities. In particular, some sound alteration methods are examined, leading toward a solution to the problem of the musician‐machine interface.