Pioneer Corporation

Nec Corporation

Satoshi Ohashi

Takahiro Kuramoto

Mineki Miyasaka

Naho Hatagishi

Tamami Matsuyama

Electronic stethoscope

Sound quality control apparatus

Speaker box

Volume adjuster

Speaker with amplifier

Speaker with amplifier and digital audio disc player

In an ATM network time management method, a shaping operation is performed to equalize cell flows by generating the arrival time of an ATM cell on the basis of the arrival intervals of input ATM cells, and adding an optimum delay to the arrival time, thereby obtaining an ideal transmission time t . A flag is prepared to indicate whether the value of a timer counter for generating the arrival time of an ATM cell on the basis of the arrival time intervals of input ATM cells has exceeded a maximum timer cycle value. The shaping operation is performed by managing the arrival time of the ATM cell with reference to a relative time in accordance with the state of the flag.

ATM network time management method

In a shaping processing apparatus which receives ATM cells as reception ATM cells which contains normal ATM cells and tagging ATM cells, a scheduling unit calculates a transmission time of the reception ATM cell based on a transmission time of a previous ATM cell belonging to a same connection as the reception ATM cell and transmitted immediately before the reception ATM cell and a predetermined time interval. A cell identifying unit identifies a connection number and cell priority of the reception ATM cell. The normal ATM cell has a higher cell priority than the tagging ATM cell. A mapping unit maps the reception ATM cell into a managing table based on the transmission time of the reception ATM cell to store the connection number and cell priority of the reception ATM cell in a storage area of the managing table. The managing table is associated with transmission times. The mapping unit outputs an address corresponding to the storage area as the write address to a shaping processing buffer such that the reception ATM cell is stored in the shaping processing buffer.

Method and apparatus for shaping processing in which discard of ATM cell

An ATM cell flow control apparatus includes interface sections for terminating transmission lines of two systems which constitute a redundant structure and to which identical cell sequences are supplied. Each interface section includes a cell synchronization section, a cell buffer, a policing section, and a delay control section. The cell synchronization section performs cell synchronization control of an input cell sequence and outputs the sequence in units of cells. The cell buffer performs delay adjustment of each cell output from the cell synchronization section. The policing section detects the cell interval between cells output from the cell buffer, and discards cells having a detected cell interval shorter than a predetermined cell interval. The delay control section detects the phase difference between a cell output from the cell buffer of a self-system and a cell output from the cell buffer of the other system, and controls the cell buffer in accordance with the detected phase difference.

ATM cell flow control apparatus

Growing community of inventors

Tokyo, Japan

Satoshi Ohashi