JPS60180142U - signal transmission equipment - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の信号伝送方式のブロック構成図、第２図
は第１図の入力信号の周波数スペクトル図、第３図は第
１図におけるＤ−Ａ変換後の信号の周波数スペクトル図
、第４図は理想的な低域゛　　　通過戸波器の特性曲線
図、第５図は実際の低域通過沖波器の特性曲線図、第６
−図は高速度動作のＡ−Ｄ変換器を用いた場合のＤ−Ａ
変換後の周波数スペクトル図、第７図は本考案の一実施
例を示す信号伝送装置のブロック構成図、第８図は第７
図における入力波形図、第９図は第７図における補間回
路の構成図、第１０図、第１１図は帯域内の利得および
位相の周波数特性曲線図、第１２図は第７−図における
Ｄ−Ａ変換後の信号の周波数スペ　　　−クトル図であ
る。 ■Ｎ：アナログ入力信号、０ＵＴ＝アナログ出力信号、
１：Ａ−Ｄ変換器ミ２：Ｄ−Ａ変換器、３：低域通過沖
波器、４：Ｄ−Ｄ変換・補間回路、５：ディジタル伝送
路、ＴＳＭ−二サンプリング周期、ｆＢ：音声等の周波
数帯域、ｆ、：サンプリング周波数、ｚ：１サンプリン
グ期間の遅延回路、Ｚ／２　：　１／２サンプリング期
間の遅延回路、（＋）：和の機能ブロック、１／２　：
　１／２倍の機能ブロック。Figure 1 is a block configuration diagram of a conventional signal transmission system, Figure 2 is a frequency spectrum diagram of the input signal in Figure 1, Figure 3 is a frequency spectrum diagram of the signal after D-A conversion in Figure 1, and Figure 3 is a frequency spectrum diagram of the input signal in Figure 1. Figure 4 shows the characteristic curve of an ideal low-pass transducer, Figure 5 shows the characteristic curve of an actual low-pass transducer, and Figure 6 shows the characteristic curve of an actual low-pass transducer.
-The figure shows D-A when using a high-speed operation A-D converter.
A frequency spectrum diagram after conversion, FIG. 7 is a block configuration diagram of a signal transmission device showing an embodiment of the present invention, and FIG.
Figure 9 is a block diagram of the interpolation circuit in Figure 7, Figures 10 and 11 are frequency characteristic curves of gain and phase within the band, and Figure 12 is the D in Figure 7. - FIG. 3 is a frequency spectrum diagram of a signal after A conversion. ■N: Analog input signal, 0UT=analog output signal,
1: A-D converter 2: D-A converter, 3: Low-pass transducer, 4: D-D conversion/interpolation circuit, 5: Digital transmission line, TSM-2 sampling period, fB: Audio, etc. frequency band, f: sampling frequency, z: delay circuit of 1 sampling period, Z/2: delay circuit of 1/2 sampling period, (+): sum function block, 1/2:
1/2x functional block.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] アナログ信号をＡ−Ｄ変換器でディジタル信号に変換し
、伝送路を介してＤ−Ａ変換器に入力したのち低域−波
器を通過せしめて抽出する信号伝送方式において、前記
Ａ／Ｄ変換器の出力ディジタル信号を時間軸上で補間す
る補間信号を発生する補間手段を該Ａ−Ｄ変換器の後段
に設け、該出力ディジタル信号の該Ａ−Ｄ変換器のサン
プリング周波数近傍の周波数成分を除去し、該補間信号
を含む出力ディジタル信号を伝送路に送出することを特
徴とする信号伝送装置。In a signal transmission method in which an analog signal is converted into a digital signal by an A/D converter, the signal is inputted to the D/A converter via a transmission line, and then passed through a low frequency waveform generator to be extracted. An interpolation means for generating an interpolation signal for interpolating the output digital signal of the converter on the time axis is provided at a subsequent stage of the A-D converter, and a frequency component near the sampling frequency of the A-D converter of the output digital signal is A signal transmission device characterized in that an output digital signal containing the interpolated signal is sent to a transmission path.