Description: ISD4004 Series devices voice grade copy of the proposed draft, the introduction of the ISD4004 series voice chips, an analysis of sub-chip voice messages internal formation mechanism and characteristics of proposed method of access to the internal address on the basis of the use of address-copy method, the development of design a copy of voice systems, and gives the software design, hardware design and some applications Finally passed the test to verify the feasibility of the system.
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