I have 6 audio signals each of length 2.32 sec,sampled at 44.1KHZ sampling rate with 16 bits floating point ,I want to divide these signals into frames each of length 23.2 msec(1024 samples) in matlab?

length of signal=2.32 second, sampling frequency=441000 Hz, bits/sample=16

Answer 1

[Star Strider]

Use the reshape function:

signal = rand(2.32*44100, 6);                                   % Create Data
for k1 = 1:6
    colsize = fix(size(signal(:,k1),1)/1024)*1024;              % Maximum Length For ‘reshape’
    sig_mtx{k1} = reshape(signal(1:colsize, k1), 1024, []);     % Columns Are Frames
end

I used a cell array here. You can use a 3D array if you prefer.

Answer 2

[Walter Roberson]

See the buffer() function if you have the signal processing toolbox. It is especially useful if you need to overlap the buffers.

[PRATIBHA WARKADE]

how can I plot the graph between signals and its frame length?

[Walter Roberson]

I do not understand the question as written?

[PRATIBHA WARKADE]

actually I want to ask ,how to calculate the bit rate of these 6 signals having 23.2 msec as their frame length in MATLAB?

[Star Strider]

According to http://twistedelixir.com/2013/03/10/sample-rate-vs-bit-rate-simplified/, for an audio signal, ‘bit rate’ is the same as ‘bit depth’, or in your example, 16 bits/sample.

It’s related to but not the same as the conventional definition of Bit rate I’m familiar with.

[PRATIBHA WARKADE]

actually sir,I want to calculate bit rate in terms of bits/sample of a compressed signal having size equal to 3.688217558102919e-42kb that is equal to 30213.8782359791 bits and given 'no. of samples=1264896'.I calculated the bit rate of it as [bit_rate_of_compressed_signal=30213.8782359791/no. of samples];answer is equal to 0.0230bits/sample.Is it correct way to calculate it?Kindly suggest?

[Star Strider]

Communications theory is not something I’ve studied for the last several years. A bit rate less than 1 does not seem correct to me. You will have to consult someone more skilled in communications than I am.

I suggest you expand on your latest Comment to provide a context, and submit it as a new Question.

[Walter Roberson]

You cannot have an entity less than 1 bit, which is about 1E-4 Kilobyte. 3E-42 Kilobyte is getting down into the range of 1E-25 electrons -- not physically measurable without very very high precision equipment.

[PRATIBHA WARKADE]

K thnk u sir for ur valuable suggestion