You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: echo_dec_ts.m
    path of file: ./repos/audio-steganography-algorithms/02-Echo-Hiding/05-Echo-Hiding-Time-Spread
    
    the code of the file until where you have to start completion: function out = echo_dec_ts(signal, L, d0, d1, len_msg)
%ECHO_DEC_TS Decoding function for Time-Spread Echo Hiding Technique
%
%   INPUT VARIABLES
%       signal  : Stego signal
%       L       : Length of frames
%       d0      : Delay rate for bit0
%       d1      : Delay rate for bit1
%       len_msg : Length of hidden message
%
%   OUTPUT VARIABLES

    
function out = echo_dec_ts(signal, L, d0, d1, len_msg)
%ECHO_DEC_TS Decoding function for Time-Spread Echo Hiding Technique
%
%   INPUT VARIABLES
%       signal  : Stego signal
%       L       : Length of frames
%       d0      : Delay rate for bit0
%       d1      : Delay rate for bit1
%       len_msg : Length of hidden message
%
%   OUTPUT VARIABLES
%       out     : Retrieved message
%
%   Kadir Tekeli (kadir.tekeli@outlook.com)

if nargin < 2
    L = 8*1024;   %Length of frame
end