package com.bg7yoz.ft8cn.ft8transmit; /** * 生成FT8音频信号的类。音频数据是32位的浮点数组。 * @author BGY70Z * @date 2023-03-20 */ import android.util.Log; import com.bg7yoz.ft8cn.Ft8Message; import com.bg7yoz.ft8cn.GeneralVariables; import com.bg7yoz.ft8cn.R; import com.bg7yoz.ft8cn.ft8signal.FT8Package; import com.bg7yoz.ft8cn.ui.ToastMessage; public class GenerateFT8 { private static final String TAG = "GenerateFT8"; private static final int FTX_LDPC_K = 91; public static final int FTX_LDPC_K_BYTES = (FTX_LDPC_K + 7) / 8; private static final int FT8_NN = 79; private static final float FT8_SYMBOL_PERIOD = 0.160f; private static final float FT8_SYMBOL_BT = 2.0f; private static final float FT8_SLOT_TIME = 15.0f; private static final int Ft8num_samples = 15 * 12000; private static final float M_PI = 3.14159265358979323846f; public static final int num_tones = FT8_NN;//符号数量：FT8是79个，FT4是105个。 public static final float symbol_period = FT8_SYMBOL_PERIOD;//FT8_SYMBOL_PERIOD=0.160f private static final float symbol_bt = FT8_SYMBOL_BT;//FT8_SYMBOL_BT=2.0f private static final float slot_time = FT8_SLOT_TIME;//FT8_SLOT_TIME=15f //public static int sample_rate = 48000;//采样率 //public static int sample_rate = 12000;//采样率 static { System.loadLibrary("ft8cn"); } public static int checkI3ByCallsign(String callsign) { String substring = callsign.substring(callsign.length() - 2); if (substring.equals("/P")) { if (callsign.length() <= 8) { return 2;//i3=2消息 } else { return 4;//说明时非标准呼号 } } if (substring.equals("/R")) { if (callsign.length() <= 8) { return 1;//i3=2消息 } else { return 4;//说明时非标准呼号 } } if (callsign.contains("/")) {//除了/P /R以外，其余的都是非标准呼号 return 4; } if (callsign.length() > 6) {//呼号大于6位，也是非标准呼号 return 4; } if (callsign.length() == 0) {//没有呼号，就是自由文本 return 0; } return 1; } public static String byteToBinString(byte[] data) { if (data == null) { return ""; } StringBuilder string = new StringBuilder(); for (int i = 0; i < data.length; i++) { string.append(String.format(",%8s", Integer.toBinaryString(data[i] & 0xff)).replace(" ", "0")); } return string.toString(); } public static String byteToHexString(byte[] data) { StringBuilder string = new StringBuilder(); for (int i = 0; i < data.length; i++) { string.append(String.format(",%02X", data[i])); } return string.toString(); } /** * 检查是不是标准呼号 * * @param callsign 呼号 * @return 是不是 */ public static boolean checkIsStandardCallsign(String callsign) { String temp; if (callsign.endsWith("/P") || callsign.endsWith("/R")){ temp=callsign.substring(0,callsign.length()-2); }else { temp=callsign; } //FT8的认定：标准业余呼号由一个或两个字符的前缀组成，其中至少一个必须是字母，后跟一个十进制数字和最多三个字母的后缀。 return temp.matches("[A-Z0-9]?[A-Z0-9][0-9][A-Z][A-Z0-9]?[A-Z]?"); } /** * 检查是不是信号报告 * * @param extraInfo 扩展消息 * @return 是不是 */ private static boolean checkIsReport(String extraInfo) { if (extraInfo.equals("73") || extraInfo.equals("RRR") || extraInfo.equals("RR73")||extraInfo.equals("")) { return false; } return !extraInfo.trim().matches("[A-Z][A-Z][0-9][0-9]"); } public static float[] generateFt8(Ft8Message msg, float frequency,int sample_rate){ return generateFt8(msg,frequency,sample_rate,true); } public static byte[] generateA91(Ft8Message msg,boolean hasModifier){ if (msg.callsignFrom.length()<3){ ToastMessage.show(GeneralVariables.getStringFromResource(R.string.callsign_error)); return null; } // 首先，将文本数据打包为二进制消息,共12个字节 byte[] packed = new byte[FTX_LDPC_K_BYTES]; //把"<>"去掉 msg.callsignTo = msg.callsignTo.replace("<", "").replace(">", ""); msg.callsignFrom = msg.callsignFrom.replace("<", "").replace(">", ""); if (hasModifier) { msg.modifier = GeneralVariables.toModifier;//修饰符 }else { msg.modifier=""; } //判定用非标准呼号i3=4的条件： //1.FROMCALL为非标准呼号 ，且 符合2或3 //2.扩展消息时 网格、RR73,RRR,73 //3.CQ,QRZ,DE if (msg.i3 != 0) {//目前只支持i3=1,i3=2,i3=4,i3=0 && n3=0 if (!checkIsStandardCallsign(msg.callsignFrom) && (!checkIsReport(msg.extraInfo) || msg.checkIsCQ())) { msg.i3 = 4; //} else if (msg.callsignFrom.endsWith("/P")||(msg.callsignTo.endsWith("/P"))) { } else if (msg.callsignFrom.endsWith("/P")//如果目标有/P后缀，则以目标呼号为准。如果目标没有/P后缀，则以发送方是否有/P后缀为准 ||(msg.callsignTo.endsWith("/P")&&(!msg.callsignFrom.endsWith("/P")))) { msg.i3 = 2; } else { msg.i3 = 1; } } if (msg.i3 == 1 || msg.i3 == 2) { packed = FT8Package.generatePack77_i1(msg); } else if (msg.i3 == 4) {//说明是非标准呼号 packed = FT8Package.generatePack77_i4(msg); } else { packFreeTextTo77(msg.getMessageText(), packed); } return packed; } /** * 生成FT8信号 * @param msg 消息 * @param frequency 频率 * @param sample_rate 采样率 * @param hasModifier 是否有修饰符 * @return */ public static float[] generateFt8(Ft8Message msg, float frequency,int sample_rate,boolean hasModifier) { // if (msg.callsignFrom.length()<3){ // ToastMessage.show(GeneralVariables.getStringFromResource(R.string.callsign_error)); // return null; // } // // 首先，将文本数据打包为二进制消息,共12个字节 // byte[] packed = new byte[FTX_LDPC_K_BYTES]; // //把"<>"去掉 // msg.callsignTo = msg.callsignTo.replace("<", "").replace(">", ""); // msg.callsignFrom = msg.callsignFrom.replace("<", "").replace(">", ""); // if (hasModifier) { // msg.modifier = GeneralVariables.toModifier;//修饰符 // }else { // msg.modifier=""; // } //判定用非标准呼号i3=4的条件： //1.FROMCALL为非标准呼号 ，且 符合2或3 //2.扩展消息时 网格、RR73,RRR,73 //3.CQ,QRZ,DE // if (msg.i3 != 0) {//目前只支持i3=1,i3=2,i3=4,i3=0 && n3=0 // if (!checkIsStandardCallsign(msg.callsignFrom) // && (!checkIsReport(msg.extraInfo) || msg.checkIsCQ())) { // msg.i3 = 4; // } else if (msg.callsignFrom.endsWith("/P")||(msg.callsignTo.endsWith("/P"))) { // msg.i3 = 2; // } else { // msg.i3 = 1; // } // } // // if (msg.i3 == 1 || msg.i3 == 2) { // packed = FT8Package.generatePack77_i1(msg); // } else if (msg.i3 == 4) {//说明是非标准呼号 // packed = FT8Package.generatePack77_i4(msg); // } else { // packFreeTextTo77(msg.getMessageText(), packed); // } return generateFt8ByA91(generateA91(msg,hasModifier),frequency,sample_rate); //return generateFt8ByA91(packed,frequency,sample_rate); } public static float[] generateFt8ByA91(byte[] a91, float frequency,int sample_rate){ byte[] tones = new byte[num_tones]; // 79音调（符号）数组 //此处是12个字节（91+7）/8，可以使用a91生成音频 ft8_encode(a91, tones); // 第三，将FSK音调转换为音频信号b int num_samples = (int) (0.5f + num_tones * symbol_period * sample_rate); // 数据信号中的采样数0.5+79*0.16*12000 float[] signal = new float[num_samples]; //Ft8num_sampleFT8声音的总采样数，不是字节数。15*12000 //for (int i = 0; i < Ft8num_samples; i++)//把数据全部静音。 for (int i = 0; i < num_samples; i++)//把数据全部静音。 { signal[i] = 0; } // 用79个字节符号，生成FT8音频 synth_gfsk(tones, num_tones, frequency, symbol_bt, symbol_period, sample_rate, signal, 0); // for (int i = 0; i < num_samples; i++)//把数据全部静音。 // { // if (signal[i]>1.0||signal[i]<-1.0){ // Log.e(TAG, "generateFt8: "+signal[i] ); // } // } return signal; } private static native int packFreeTextTo77(String msg, byte[] c77); private static native int pack77(String msg, byte[] c77); private static native void ft8_encode(byte[] payload, byte[] tones); private static native void synth_gfsk(byte[] symbols, int n_sym, float f0, float symbol_bt, float symbol_period, int signal_rate, float[] signal, int offset); }