LP的高频究竟能到多少?提供一些客观资料. [复制链接]

Raxel 在 2006-4-24 8:31:00 发表的内容

csdam 在 2006-4-24 1:19:11 发表的内容 In order to playback CD-4 discs with full surround capabilities, additional equipment were required compared to the matrix systems. Most turntable cartridges and styli were only capable of reproducing frequencies up to 20KHz since anything of higher magnitude humans cannot hear. The use of a standard cartridge and styli would not allow for four loudspeaker-playback as they would not pickup the 30KHz carrier signal. It was thus necessary to use the Shibata stylus with a cartridge that would allow for a frequency response up to 45KHz. Secondly a small device, the demodulator, was required to extract the four channels. A few manufacturers later developed amplifiers that had a demodulator built-in (The institute of High Fidelity 1974).

30khz的究竟是什么信号?我没有看到说唱头配合LP,音乐内容的高频可以相应到45khz.