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@18:6630d61aeb3c, 2016-02-22 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Mon Feb 22 13:54:51 2016 +0000
- Revision:
- 18:6630d61aeb3c
- Parent:
- 14:cd4534fb34e7
19
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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MikamiUitOpen | 6:b27ef8d98edc | 1 | //------------------------------------------------ |
MikamiUitOpen | 2:095b360e0f54 | 2 | // Class for sampling input signal (Header) |
MikamiUitOpen | 0:5c237fdcba23 | 3 | // |
MikamiUitOpen | 12:e5367ab82460 | 4 | // 2015/12/31, 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 | 7:6598a9b70e5a | 17 | Sampler(PinName pin, int fs, int nData); |
MikamiUitOpen | 7:6598a9b70e5a | 18 | |
MikamiUitOpen | 7:6598a9b70e5a | 19 | ~Sampler(); |
MikamiUitOpen | 7:6598a9b70e5a | 20 | |
MikamiUitOpen | 8:1f4bc859bc84 | 21 | // Start sampling |
MikamiUitOpen | 8:1f4bc859bc84 | 22 | void Start(bool onOff); |
MikamiUitOpen | 11:a8420871920e | 23 | |
MikamiUitOpen | 12:e5367ab82460 | 24 | // Stop sampling |
MikamiUitOpen | 12:e5367ab82460 | 25 | void Stop() { timer_.detach(); } |
MikamiUitOpen | 12:e5367ab82460 | 26 | |
MikamiUitOpen | 0:5c237fdcba23 | 27 | bool Filled() { return filled_; } |
MikamiUitOpen | 7:6598a9b70e5a | 28 | |
MikamiUitOpen | 7:6598a9b70e5a | 29 | // Get pointer for sampled data |
MikamiUitOpen | 8:1f4bc859bc84 | 30 | int16_t* Get() { return sn_; } |
MikamiUitOpen | 7:6598a9b70e5a | 31 | |
MikamiUitOpen | 0:5c237fdcba23 | 32 | private: |
MikamiUitOpen | 2:095b360e0f54 | 33 | const int TS_; // sampling period |
MikamiUitOpen | 0:5c237fdcba23 | 34 | const int N_DATA_; // number of 1 frame data |
MikamiUitOpen | 0:5c237fdcba23 | 35 | |
MikamiUitOpen | 8:1f4bc859bc84 | 36 | AnalogIn aIn_; // Object for ADC |
MikamiUitOpen | 2:095b360e0f54 | 37 | Ticker timer_; // Object of Ticker |
MikamiUitOpen | 0:5c237fdcba23 | 38 | |
MikamiUitOpen | 0:5c237fdcba23 | 39 | bool trigger_; |
MikamiUitOpen | 0:5c237fdcba23 | 40 | bool filled_; |
MikamiUitOpen | 0:5c237fdcba23 | 41 | int count_; |
MikamiUitOpen | 0:5c237fdcba23 | 42 | int16_t xnM1_; |
MikamiUitOpen | 8:1f4bc859bc84 | 43 | int16_t* const sn_; // data to be analyzed |
MikamiUitOpen | 7:6598a9b70e5a | 44 | int16_t* const buffer_; // for input buffer |
MikamiUitOpen | 2:095b360e0f54 | 45 | |
MikamiUitOpen | 2:095b360e0f54 | 46 | // For input |
MikamiUitOpen | 8:1f4bc859bc84 | 47 | int16_t (Sampler::*Rd)(); |
MikamiUitOpen | 2:095b360e0f54 | 48 | int16_t ReadNorm() { return aIn_.read_u16() - 32767; } |
MikamiUitOpen | 2:095b360e0f54 | 49 | int16_t ReadInv() { return 32767 - aIn_.read_u16(); } |
MikamiUitOpen | 2:095b360e0f54 | 50 | |
MikamiUitOpen | 8:1f4bc859bc84 | 51 | // Set inverting on or off |
MikamiUitOpen | 8:1f4bc859bc84 | 52 | void Invert(bool onOff) |
MikamiUitOpen | 8:1f4bc859bc84 | 53 | { |
MikamiUitOpen | 8:1f4bc859bc84 | 54 | Rd = onOff ? |
MikamiUitOpen | 8:1f4bc859bc84 | 55 | &Sampler::ReadInv // Inverted |
MikamiUitOpen | 8:1f4bc859bc84 | 56 | : &Sampler::ReadNorm; // Non-inverted |
MikamiUitOpen | 8:1f4bc859bc84 | 57 | } |
MikamiUitOpen | 8:1f4bc859bc84 | 58 | |
MikamiUitOpen | 2:095b360e0f54 | 59 | // Interrupt service routine for Ticker |
MikamiUitOpen | 2:095b360e0f54 | 60 | void Isr(); |
MikamiUitOpen | 6:b27ef8d98edc | 61 | |
MikamiUitOpen | 6:b27ef8d98edc | 62 | // disallow copy constructor and assignment operator |
MikamiUitOpen | 6:b27ef8d98edc | 63 | Sampler(const Sampler& ); |
MikamiUitOpen | 6:b27ef8d98edc | 64 | Sampler& operator=(const Sampler& ); |
MikamiUitOpen | 0:5c237fdcba23 | 65 | }; |
MikamiUitOpen | 0:5c237fdcba23 | 66 | } |
MikamiUitOpen | 0:5c237fdcba23 | 67 | #endif // F746_SAMPLER_HPP |