编写MATLAB函数,完成DTMF信号的8个单频数据的产生,以及16个按键号的DTMF信号数据的产生;(采样频率fs=8k,12位线性PCM数据)
时间: 2024-02-28 10:57:45 浏览: 19
以下是一个可能的MATLAB函数实现:
```matlab
function [singleFreqs, dtmfSignals] = genDTMFSignals(fs)
% 产生DTMF信号的8个单频数据
f1 = 697; f2 = 1209; % 按键1
singleFreqs(1,:) = sin(2*pi*f1/fs*(0:fs-1));
singleFreqs(2,:) = sin(2*pi*f2/fs*(0:fs-1));
f1 = 697; f2 = 1336; % 按键2
singleFreqs(3,:) = sin(2*pi*f1/fs*(0:fs-1));
singleFreqs(4,:) = sin(2*pi*f2/fs*(0:fs-1));
f1 = 697; f2 = 1477; % 按键3
singleFreqs(5,:) = sin(2*pi*f1/fs*(0:fs-1));
singleFreqs(6,:) = sin(2*pi*f2/fs*(0:fs-1));
f1 = 770; f2 = 1209; % 按键4
singleFreqs(7,:) = sin(2*pi*f1/fs*(0:fs-1));
singleFreqs(8,:) = sin(2*pi*f2/fs*(0:fs-1));
% 产生16个按键号的DTMF信号数据
keys = ['1','2','3','A';
'4','5','6','B';
'7','8','9','C';
'*','0','#','D'];
f1s = [697, 770, 852, 941];
f2s = [1209, 1336, 1477, 1633];
dtmfSignals = zeros(fs*0.5,16); % 每个按键号0.5秒
for row = 1:4
for col = 1:4
f1 = f1s(row);
f2 = f2s(col);
dtmfSignals(:,(row-1)*4+col) = 0.5*sin(2*pi*f1/fs*(0:fs*0.5-1)) + 0.5*sin(2*pi*f2/fs*(0:fs*0.5-1));
end
end
```
调用方式:
```matlab
fs = 8000;
[singleFreqs, dtmfSignals] = genDTMFSignals(fs);
```
其中`singleFreqs`为8个单频数据,每行代表一个频率;`dtmfSignals`为16个按键号的DTMF信号数据,每列代表一个按键号。