发明名称 Telephone ringing signal generator
摘要 A waveform generator (FIG. 1) contains a static energy storage device circuit in which storage devices (C1 through C6) are interconnected in a fixed topological configuration. The storage device circuit has a plurality of input and output terminals (12 through 18). Charge storage is accomplished by controllably steering (20, 40) a supplied DC signal (10a,b) to a selected one, or selected ones, of the storage devices via the appropriate input terminals. AC waveforms are generated (11a,b) by controllably selecting (30, 40), in predetermined sequence, each output terminal of the storage device circuit.
申请公布号 US4415961(A) 申请公布日期 1983.11.15
申请号 US19810296307 申请日期 1981.08.26
申请人 BELL TELEPHONE LABORATORIES, INCORPORATED 发明人 HARMON, JR., WILLIAM R.
分类号 H03K4/02;H04M19/02;(IPC1-7):H03K3/51 主分类号 H03K4/02
代理机构 代理人
主权项
地址