| 摘要 |
PURPOSE:To simplify a circuit constitution and to prevent useless deterioration in sound quality by controlling selectively a sampling clock and selecting only the required channel to omit a changeover switch. CONSTITUTION:A digital voice signal 8 is converted into a composite sampled signa 9 by a D/A converter 1 and only the sampled signal corresponding to the required channel is selected via a selector switch by a selection control cirlcuit. That is, a sampling clock 12 generated from a sampling clock generating circuit 6 is fed to one input of 2-input AND gates 17-1-17-4 constituting the selection control circuit 17, an inverting signal of a selection signal 16 is fed to the other input, and sampling clocks 18-1, 18-2 selected by the selecting signal from the sampling clock 12 are outputted to an output of the selection control circuit 17. A selection switch 2 is controlled selectively by the selection sampling clocks 18-1, 18-2 to output only the sampled signal 10 corresponding to the required channel. |
