Osamu Hamada

Fluid flow control speaker system

A fluid flow control system has a fluid source and plural flow pipes connected to the fluid source. Each of the pipes has an opening of a specific area corresponding to one of the bit orders of a PCM (Pulse Code Modulated) input signal. The flow-condition of the fluid through each of the pipes is controlled by the PCM signal without changing the PCM signal to an analog signal. The summation of the outflow from each of the pipes combines to produce an analog flow output signal in response to the PCM input signal.

Two chip DSP implementation on gate array

Two types of general purpose digital signal processing LSIs have been developed. One is a processing chip that includes a 28-bit ALU, a microprogram sequencer and peripheral interface circuits. Another is a 32 × 16 bit parallel multiplier chip. Combined with external static memory chips, these LSIs can execute operations at a rate of eight million instructions per second.