the present invention is a computerized dog - based security system which receives auditory and / or physiological signals from a single or a group of dogs on guard , analyzes them and gives indications as to the alert level according to the dogs &# 39 ; emotional state at any given point in time . the invention is a new and efficient means for integrating the many benefits and advantages of dogs ( dogs ) into an automatic interpretive security system . the system receives auditory and / or physiological signals from dogs , performs a unique digital signal processing analysis , and provides an indication as to one of several possible system alert levels and events . at the heart of the system is a series of proprietary audio and physiological data processing algorithms , which digitally sample the signals , filter , identify and analyze the data profile according to predetermined parameters . it can detect the vitality signs of any specific dog , determine whether it is alive and awake , and measure its level of alertness . based on this analysis , the system can provide a highly accurate estimation of the dogs &# 39 ; state of alertness in a specific location . the preferred embodiment of the present invention as illustrated in fig1 includes three principal units : a monitoring unit 100 , a processing and analyzing unit 200 and the user security terminal 300 . the monitoring unit 100 is positioned in close proximity to the dogs or attached to the dogs , it records and transmits the raw data to the processing and analyzing unit 200 , which performs the analysis and transmits the dog &# 39 ; s alertness level to the user security terminal 300 . fig2 illustrates the monitoring unit 100 that records and transmits vocal and physiological signals from the dogs . the audio signal - recording unit 110 is comprised of a sensor 111 for picking up the audio signal from the dogs . as illustrated in fig1 , the audio signal recording unit 110 may be attached or implanted to the dog or placed in its vicinity . the physiological sensor unit 120 records stress - related physiological indicators from the dogs &# 39 ; somatic system , such as heartbeat rate 121 , blood pressure 122 , breathing pace 123 , body temperature 124 and gross motor activity 125 . the physiological sensor unit 120 may be implanted in the dog or attached to its body . the monitoring unit 100 is also comprised of a ac \ dc power supply unit 130 , a power saving unit 140 ( an electrical consumption reduction and saving unit ), and a communication interface 150 which transmits the signals from the monitoring unit 100 to the processing and analyzing unit 200 , using a radio transmitter or other physical communication methods ; ( units 200 and 100 may be joined together to form one physical unit ) fig3 illustrates the processing and analyzing unit 200 . this unit 200 receives the data from the monitoring unit 100 , processes and analyses it and transmits the output data to the user security terminal 300 . the unit monitors the state of the dog and analyzes whenever the dog experiences an alarming situation . the processing and analyzing unit 200 may be embedded into monitoring unit 100 , into the user security terminal 300 or a standalone remote unit . the processing and analyzing unit 200 is comprised of a signal receiver 210 , an analogue to digital ( a / d ) converter and amplifier 220 , a central processing unit 230 and a communications interface 240 . the signal receiver 210 receives the signals from each sensor unit 100 and transfers these signals to the a / d converter 220 . the converter 220 amplifies the analog signals and transforms the analog signals to digital signals . a central processing unit 230 executes the main processing and analyzing algorithms . it includes an audio processing and analyzing algorithm 231 , a physiological processing and analyzing algorithm 232 and a security decision module 233 . the audio processing and analyzing algorithm 231 receives the auditory signals and analyses them , hence providing a calculated estimation of the dog &# 39 ; s psychological condition indicating the dogs &# 39 ; alertness level . as illustrated in the flow charts in fig4 , the sound pattern processing algorithm module 231 a processes the received signals , filters the environmental noise , and measures the energy level of several spectral bands of the audio signal . the algorithm module 231 b analyzes the processed signals and identifies emotional parameters . the analysis is based on predetermined audio parameters , incorporates bark detection , an estimation of the bark &# 39 ; s fundamental frequency ( pitch ) and temporal parameters including mean bark rate , time gap between barks , time variant of barks , and their intensity . the physiological analyzing algorithm 232 processes ( see fig5 ) the received physiological signals from the sensor 120 and estimates the dogs &# 39 ; emotional state based on the physiological data , according to predetermined physiological parameters . in the preferred embodiment , the physiological data includes the dogs &# 39 ; heartbeat rate 121 , blood pressure 122 , breathing pace 123 , body temperature 124 , and gross motor activity 125 , but it may also include other physiological data such as , muscles tonus , skin conductivity and so on . algorithm 232 analyzes these parameters for every sensor individually . the security decision algorithm module 233 processes ( see fig6 ) the complete analyzed output data from algorithms 231 and 232 to determine the state of the dog . according to these readings , module 233 determines the current level of security and the nature of any security events . as previously mentioned , the processing and analyzing unit 200 also includes a communication interface 240 which is a communication unit component . this unit notifies the user security terminal 300 as to the : fig4 block 231 a specifies the flowchart of pre - processing of audio data . the processing of the audio signal includes the following steps : first , the digital signal is passed through an array of digital band - pass filters ( bpf ) with varying frequency ranges and widths . this eliminates noise and measures the amount of signal energy at each frequency band . in order to maintain a standard and consistent framework along the time signal , the signal is then normalized to a given range (− 1 , 1 ), in an adaptive manner . thereafter , the system determines if the current time frame is a qualified frame by checking whether in the current time frame the signal contains any valid sound patterns . the decision is based on the output of the bpfs &# 39 ; energy levels . this saves analyzing resources since it prevents the system from redundant operation if the signal contains only silence or background noise . if the frame is announced as having substantial data the process continues to the next stage . fig4 block 231 b specifies the flowchart of analyzing the audio digital data . first a sound pattern is detected . the sound pattern detected relates mainly to bark sounds , but may also relate to other behavior characteristics such as breathing , sniffing or panting . the following description relates specifically to barking sounds , although the same analysis may be applied to other behavior patterns . the purpose of this analysis is to recognize barks when they occur and locate them on a time line . looking for a specific amplitude pattern , which is typical to a dog &# 39 ; s bark , achieves this purpose . the detected bark must also have a duration , which falls within predefined time limits , and have its amplitude above a certain level in order to be qualified as a bark . this step also helps the system to be more robust to various impulse and stationary noises . for each detected bark , the time - stamp of the bark peak and the peak value are recorded into a vector . each bark segment is further normalized by its peak value ; so all barks are comparable in under equal conditions . the next step estimates the pitch or the fundamental frequency of a bark . in addition , it looks for stress signs in the dog &# 39 ; s bark . three major features of the sampled signal are analyzed on the basis of pitch measurement : distinguishing between barks originating in response to threat and barks , which are a response to routine activity ( such as play , trainer , patrol or a stray cat , etc . ); distinguishing between barks coming from different dogs and ruling out any sounds which are not barks , such as human speech or shouts . if a certain bark successfully meets all of the requirements of a valid bark , it is qualified and it remains in the bark vector . otherwise , it is eliminated from the vector . then , clustering may be performed . the purpose of clustering is to classify the barks in the bark vector into groups that correspond to the possible sources of the audio signal . this classification is mainly done based on their pitch but it may also include other features . the source separation enables to distinguish between barks from different dogs . the clustering process further contributes to eliminating noise such as music , and human voices . finally , the clustered bark vector is analyzed statistically , calculating : the intervals between single barks , mean and variance of barking rate and barks distribution . these statistic data , combined with the pitch and stress features are delivered to the final decision module 233 . the decision module 233 receives features and parameters that characterize emotional and physiological behavior of the current time frame . the decision may result in determining that there is no alert , that the alert is at a medium level or that there is a high alert . alert at a medium level might mean that there is some suspicious activity that needs attention , and high alert means that there is a definite territory intrusion , which may be an indication of a security breach . at the same time the system can analyze every dog &# 39 ; s physiological indicators , as received from the physiological sensor unit 120 as illustrated in fig5 . the physiological parameters are analyzed to determine the emotional state of the dog . the dog &# 39 ; s state of alertness may be estimated by measuring different parameters of its somatic system . being in a stressful situation causes an increase in the heartbeat rate , in the systolic blood pressure , in the body temperature and in the breathing rhythm and depth . monitored physiological parameters are categorized into three groups . low rates on all indicators show that the dog is calm and that there is nothing attracting its attention in particular . a moderate increase in these parameters indicates that the dog is in a state of alertness due to an activity in its surroundings , which does not demand a special attention . high rates on these indicators show that the dog is in a state of stress and that an alarming situation has developed . in addition , measuring the dog &# 39 ; s gross motor activity , taking into account its circadian activity rhythm and its general behavior patterns , can also help identifying irregular forms of reactions . integrating the information given by the analysis of the dog &# 39 ; s auditory signals and its physiological status gives a highly accurate representation of the security status as it is sensed by the dog . monitoring the physiological status of the dog also ensures having a 4 ′ constant update on the well being of the dog and his performance relating to security maters . any attempt to hurt a dog , whether successful or unsuccessful , will be immediately apparent and would activate the alarms . the user security terminals 300 which are illustrated in fig7 may include any set of integrated applications , including pc based security application 330 , database and logging capabilities 350 , user applications , security and alarm systems 360 , an alarm transmission to pagers 310 , mobile phones or any other communication and notification devices 320 . it may also integrate pda &# 39 ; s and mobile devices 340 . additionally , the system can be easily adjusted to address specific needs , by training the dogs to react in a certain manner to specific situations and by translating the respective auditory and physiological indications of these reactions accordingly . by way of example , if , the dogs are trained to react intensively to an approaching vehicle as opposed to any person approaching by foot , they might still bark if a person appears , but their reaction will be a moderate one and it will be interpreted as such by the system , whereas an approaching car will cause the dogs to give a stressful reaction and activate the alarm . while the above description is very specific , these should not be construed as limitations on the scope of the invention , but rather as exemplifications of the preferred embodiments . those skilled in the art will envision other possible variations that are within its scope . accordingly , the scope of the invention should be determined not by the embodiment illustrated , but by the appended claims and their legal equivalents .