This paper investigates new architecture LSIs based on wave-parallel computing(WPC) to address the interconnection problems in highly parallel VLSI systems. The underlying concept is frequency multiplexing of digital signals, which enables us to utilize the parallelism of electrical(or optical) waves for parallel processing. The key to success with WPC architecture lies in finding efficient implementation of multi-wave selection function. This paper proposes a multi-wave selection circuit based on coherent detection of modulated waves. The proposed method has potential advantage of high degree of multiplexing and real-time-variable selectivity. Also, its application to the densely connected WPC architecture for minimum-latency image processing is discussed with emphasis on the reduction in the number of interconnections.