cvsd算法的matlab实现
时间: 2023-11-07 11:54:50 浏览: 141
以下是CVSD算法的MATLAB实现代码:
```matlab
function [output_signal, bitrate] = cvsdcoder(input_signal, fs)
% CVSD algorithm implementation in MATLAB
% input_signal: input audio signal (Mono, 16-bit, 8kHz sampling rate)
% fs: sampling rate of input audio signal
% output_signal: output CVSD-encoded audio signal (Mono, 16-bit, 8kHz sampling rate)
% bitrate: bitrate of the CVSD-encoded audio signal
% Initialize variables
bitstream = zeros(size(input_signal));
output_signal = zeros(size(input_signal));
n = length(input_signal);
S = 0;
delta = 0.5;
alpha = 0.5;
% Perform CVSD encoding
for i = 1:n
% Compute delta based on S and alpha
if S >= 0
delta = (1 - alpha) * S + alpha;
else
delta = (1 + alpha) * S - alpha;
end
% Compute quantized delta
if input_signal(i) >= delta
bitstream(i) = 1;
S = S + delta;
else
bitstream(i) = 0;
S = S - delta;
end
% Convert bitstream to output signal
if bitstream(i) == 0
output_signal(i) = S - delta/2;
else
output_signal(i) = S + delta/2;
end
end
% Convert output signal to 16-bit PCM
output_signal = int16(output_signal);
bitrate = fs/sum(bitstream);
end
```
使用方法:
```matlab
[input_signal, fs] = audioread('input.wav');
[output_signal, bitrate] = cvsdcoder(input_signal, fs);
audiowrite('output.wav', output_signal, fs);
```
请注意,CVSD编码器和解码器通常需要使用相同的参数和算法实现。因此,您需要使用相同的参数和算法实现来解码输出信号。
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