Realtime spectrum analyzer. Using FFT, linear prediction, or cepstrum smoothing. Version using MEMS microphone and CODEC, named "F746_RealtimeSpectrumAnalyzer_MEMS_Mic" is registered. リアルタイム スペクトル解析器.解析の手法:FFT,線形予測法,ケプストラムによる平滑化の3種類.このプログラムの説明は,CQ出版社のインターフェース誌,2016年4月号に掲載.外付けのマイクまたは他の信号源等を A0 に接続する.線形予測法,ケプストラムは,スペクトル解析の対象を音声信号に想定してパラメータを設定している.MEMS マイクと CODEC を使ったバージョンを "F746_RealtimeSpectrumAnalyzer_MEMS_Mic" として登録.
Dependencies: BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed
MyClasses/Sampler.hpp@6:b27ef8d98edc, 2015-12-18 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Fri Dec 18 10:09:31 2015 +0000
- Revision:
- 6:b27ef8d98edc
- Parent:
- 4:99d4d5ea06a2
- Child:
- 7:6598a9b70e5a
7
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 6:b27ef8d98edc | 1 | //------------------------------------------------ |
MikamiUitOpen | 2:095b360e0f54 | 2 | // Class for sampling input signal (Header) |
MikamiUitOpen | 0:5c237fdcba23 | 3 | // |
MikamiUitOpen | 6:b27ef8d98edc | 4 | // 2015/12/18, Copyright (c) 2015 MIKAMI, Naoki |
MikamiUitOpen | 6:b27ef8d98edc | 5 | //------------------------------------------------ |
MikamiUitOpen | 0:5c237fdcba23 | 6 | |
MikamiUitOpen | 0:5c237fdcba23 | 7 | #ifndef F746_SAMPLER_HPP |
MikamiUitOpen | 0:5c237fdcba23 | 8 | #define F746_SAMPLER_HPP |
MikamiUitOpen | 0:5c237fdcba23 | 9 | |
MikamiUitOpen | 0:5c237fdcba23 | 10 | #include "mbed.h" |
MikamiUitOpen | 0:5c237fdcba23 | 11 | |
MikamiUitOpen | 0:5c237fdcba23 | 12 | namespace Mikami |
MikamiUitOpen | 0:5c237fdcba23 | 13 | { |
MikamiUitOpen | 0:5c237fdcba23 | 14 | class Sampler |
MikamiUitOpen | 0:5c237fdcba23 | 15 | { |
MikamiUitOpen | 0:5c237fdcba23 | 16 | public: |
MikamiUitOpen | 6:b27ef8d98edc | 17 | Sampler(PinName pin, int fs, int nData, |
MikamiUitOpen | 6:b27ef8d98edc | 18 | int16_t* const buffer); |
MikamiUitOpen | 2:095b360e0f54 | 19 | |
MikamiUitOpen | 2:095b360e0f54 | 20 | void IntrEnable(); |
MikamiUitOpen | 0:5c237fdcba23 | 21 | |
MikamiUitOpen | 0:5c237fdcba23 | 22 | bool Filled() { return filled_; } |
MikamiUitOpen | 0:5c237fdcba23 | 23 | |
MikamiUitOpen | 0:5c237fdcba23 | 24 | void Restart() { filled_ = false; } |
MikamiUitOpen | 0:5c237fdcba23 | 25 | |
MikamiUitOpen | 2:095b360e0f54 | 26 | void InvertEnable(bool onOff) |
MikamiUitOpen | 2:095b360e0f54 | 27 | { sw_ = onOff ? 1 : 0; } |
MikamiUitOpen | 0:5c237fdcba23 | 28 | |
MikamiUitOpen | 0:5c237fdcba23 | 29 | private: |
MikamiUitOpen | 2:095b360e0f54 | 30 | const int TS_; // sampling period |
MikamiUitOpen | 0:5c237fdcba23 | 31 | const int N_DATA_; // number of 1 frame data |
MikamiUitOpen | 0:5c237fdcba23 | 32 | |
MikamiUitOpen | 0:5c237fdcba23 | 33 | AnalogIn aIn_; // Object of ADC |
MikamiUitOpen | 2:095b360e0f54 | 34 | Ticker timer_; // Object of Ticker |
MikamiUitOpen | 0:5c237fdcba23 | 35 | |
MikamiUitOpen | 0:5c237fdcba23 | 36 | bool trigger_; |
MikamiUitOpen | 0:5c237fdcba23 | 37 | bool filled_; |
MikamiUitOpen | 0:5c237fdcba23 | 38 | int count_; |
MikamiUitOpen | 0:5c237fdcba23 | 39 | int16_t xnM1_; |
MikamiUitOpen | 2:095b360e0f54 | 40 | int sw_; |
MikamiUitOpen | 6:b27ef8d98edc | 41 | int16_t* const buffer_; // for sampled data |
MikamiUitOpen | 2:095b360e0f54 | 42 | |
MikamiUitOpen | 2:095b360e0f54 | 43 | // For input |
MikamiUitOpen | 2:095b360e0f54 | 44 | int16_t (Sampler::*Rd[2])(); |
MikamiUitOpen | 2:095b360e0f54 | 45 | int16_t ReadNorm() { return aIn_.read_u16() - 32767; } |
MikamiUitOpen | 2:095b360e0f54 | 46 | int16_t ReadInv() { return 32767 - aIn_.read_u16(); } |
MikamiUitOpen | 2:095b360e0f54 | 47 | |
MikamiUitOpen | 2:095b360e0f54 | 48 | void Set(bool tf); |
MikamiUitOpen | 2:095b360e0f54 | 49 | |
MikamiUitOpen | 2:095b360e0f54 | 50 | // Interrupt service routine for Ticker |
MikamiUitOpen | 2:095b360e0f54 | 51 | void Isr(); |
MikamiUitOpen | 6:b27ef8d98edc | 52 | |
MikamiUitOpen | 6:b27ef8d98edc | 53 | // disallow copy constructor and assignment operator |
MikamiUitOpen | 6:b27ef8d98edc | 54 | Sampler(const Sampler& ); |
MikamiUitOpen | 6:b27ef8d98edc | 55 | Sampler& operator=(const Sampler& ); |
MikamiUitOpen | 0:5c237fdcba23 | 56 | }; |
MikamiUitOpen | 0:5c237fdcba23 | 57 | } |
MikamiUitOpen | 0:5c237fdcba23 | 58 | #endif // F746_SAMPLER_HPP |