pcm = struct.unpack('<h', s)[0] apcm = abs(pcm) if apcm==0: apcm=1 db = 20*math.log10(apcm) db = db * 1.2 apcm=int(math.pow(10, float(db)/20.0)) if apcm>32767: apcm=32767 if pcm < 0: pcm=-apcm else: pcm = apcm tbuf = struct.pack('<h', pcm) of.write...
一、日志类型:查询日志query log 慢查询日志:slow query log,查询执行时长超过指定时长的查询操作所记录日志 错误日志:error log 二进制日志 :binary log 中继日志:reley log 事务日志:transaction log查看所有日志相关变量:SHOW GLOBAL VARIABLES LIKE '%log%';1.1 查询日志(记录查询操作)log_ mariadb 错误日志配...
每个阶段用阶段操作符(Stage Operators)定义,在每个阶段操作符中可以用表达式操作符(Expression Operators)计算总和、平均值、拼接分割字符串等相关操作,直到每个阶段进行完成,最终返回结果,返回的结果可以直接输出,也可以存储到集合中。 MongoDB 中使用db.COLLECTION_NAME.aggregate([{<stage>},...])方法来构建和使用...
gd1db = 20*log10(gd1); figure(1); plot(freq,g1db,'b',freq,gd1db,'+r'); title(' Notch: H(s) = (s^2 + 1) / (s^2 + s/Q + 1)'); legend('analog','digital'); xlabel('Fréquence (Hz)'); ylabel(' dB')
functiony=db(x);y=log10(abs(x))*20;endfunction;[y,fs,bits]=wavread('23lloutput1.wav');maxdb=-1.5;//get from ffmpeg -i 23ll.wav -af volumedetect -f null dummyy=db(y);y=y+maxdb-max(y);plot([1:length(y)]/fs,y);xlabel('t (s)');ylabel('y (db)'); ...
log, log10, lower, max, min, month, nullif, object_id, pi, power, radians, rand, reverse**, right**, round, sign, sin, stuff**, soundex, space, square, sqrt, str, sum, suser_id, suser_name, tan, textptr, textvalid, upper**, user, user_id, user_...
idx] = sort( ww(:, 1) ); ww = ww(idx, :); ww(:, 2) = cumsum( ww(:, 2) ); h(1) = 20 * log10(K) - 20 * v * log10(ww(1,1)); for i = 2 : size(ww, 1) h(i) = h(i-1) + ww(i-1, 2) * log10( ww(i,1) / ww(i-1,1) ); end fpri...
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