acquire.m

此代码仿真了一个语音输入输出系统

% ACQUIRE   Acquires the voice signal via microphone.
%   Handles the recording 3SA's input signal.

%   Completeed: July 24, 2005

%   Terrence Irving
%   2005 NSF REU in SDR
%   Stevens Institute of Technology
%   Hoboken, NJ USA



% Globalize the appropriate data created by this component.
global voice_data mic_hear mic_continue input_player

% Globalize object handles that this component must access.
global about adc_pb bpsk_pb dac_pb debpsk_pb despread_pb demo
global explore_mode file full_mode help img instructions_txt
global mic_image mic_pb mode new quit save save_as speakers_pb
global spkrs_image spread_pb sssa_base ss_help srrc_1_pb srrc_2_pb
global title_txt

% Record.
voice_data = wavrecord(8000, 8000); % take 8000 samples at a samp. freq. of 8 kHz from the microphone

% Arbitrarily trash the right channel, keeping only the left.
voice_data = voice_data(:, 1);

% Enable the Hear and Continue buttons.
set(mic_hear, 'enable', 'on');
set(mic_continue, 'enable', 'on');

% Create audioplayer object.
input_player = audioplayer(voice_data, 8000); % player for input signal

disp('Input signal acquired');