A system for monitoring the fetal size of an expectant mother comprises an acoustic sensor for positioning over the belly of the expectant mother, the acoustic sensor configured to receive an acoustic signal generated by the fetal heartbeat and to generate a sensor output signal. A fetal size is determined from a sensor output signal strength. This system is based on the realization that certain acoustic signals generated by the fetal heart beat are strongly correlated with the fetus size.

The present invention discloses a dual-microphone adaptive filtering algorithm for collecting body sound signals, characterized in that, using at least two microphones, a primary microphone and a secondary microphone, to collect signals; the primary microphone is used to collect noisy body sound signals, and the secondary microphone is used to collect environmental noise; applying a same high-pass filtering to signals collected by the primary microphone and signals collected by the secondary microphone; using a normalized least mean square algorithm on the primary microphone signals and the secondary microphone signals after the high-pass filtering to calculate a weight of the adaptive filter and to calculate an error signal to filter out environmental noise in the primary microphone signals; processing the error signal for a first time by a low-pass filtering to restore the body sound signals, to obtain the body sound signals output by the adaptive filtering algorithm. This algorithm not only may achieve rapid convergence of filter weights, but also avoid signal distortion, and suppress environmental noise interference quickly and reliably.

A modular stethoscope system has multiple ear pieces and chest pieces. The modular stethoscope system allows multiple peoples’ heartbeat and breathing sounds to be shared. The apparatus can have multiple heart modules that are placed on users’ chests that can each receive circulatory and/or respiratory audio signals from the users. The heart modules can be coupled to each other and/or coupled to multiple audio output devices so that some or all of the users can hear the combined heartbeats. The heart modules’ inputs and outputs can be shared through direct physical links and/or converted into electrical or wireless signals that can be received by other electrical audio output devices so that multiple users can listen to multiple heartbeat outputs.

A wearable heart sound detection system, which includes an acoustic sensing device for collecting heart sound signals of the body, performing signal amplification, filtering, digitization and other preprocessing on the collected heart sound signals, and outputting the preprocessed heart sound signals; a computing electronic device communicatively coupled to the acoustic sensing device for acquiring the preprocessed heart sound signal, and a cloud data database communicatively coupled to the external computing electronic device. The acoustic device includes a capacitive sound sensor, a piezoelectric sound sensor and a circuit assembly. The circuit assembly is respectively electrically connected with the capacitive sound sensor and the piezoelectric sound sensor. The circuit assembly, the capacitive sound sensor and the piezoelectric sound sensor are integrated on a flexible substrate.

Devices and methods in which auscultation signals, ultrasound signals, and ambient noise signals may be simultaneously acquired by a same handheld device are provided. Moreover, in some embodiments, electrocardiogram (EKG) may be acquired by the handheld device. One such device includes a housing having a sensor portion at a distal end of the housing, and a handle portion between a proximal end and the distal end of the housing. An ultrasound sensor is positioned at least partially within the sensor portion of the housing, and a first auscultation sensor is positioned at least partially within the sensor portion of the housing. An ambient noise sensor is positioned at least partially within the housing between the handle portion and the proximal end of the housing.

A multi-audio stethoscope head comprising a head body (1) including a sound collecting surface (11), a vibrating diaphragm, and a fastener. The sound collecting surface (11) is provided with a sound guiding hole (16), and the fastener (3) is provided with an axial through hole (33), a fastener sidewall (31) for attaching to the head body (1), and a diaphragm pressing portion (32) for tightly attaching the vibrating diaphragm (2) to the head body (1). The vibrating diaphragm (2) is disposed between the diaphragm pressing portion (32) and the head body (1). Protruding poles (6) protruding toward the vibrating diaphragm (2) is arranged on the sound collecting surface (11) at the radially inner side of the through hole (33), and when the vibrating diaphragm (2) is not subject to external pressure, the vibrating diaphragm (2) is spaced from the protruding poles (6).

A method for medical diagnosis includes recording voice signals due to sounds spoken by a patient and recording acoustic signals output, simultaneously with the voice signals, by an acoustic transducer in contact with a thorax of the patient. A transfer function is computed between the recorded voice signals and the recorded acoustic signals or between the recorded acoustic signals and the recorded voice signals. The computed transfer function is evaluated in order to assess a medical condition of the patient.

A method for assessment and/or monitoring a person's cardiovascular state comprises: using a sound and vibration transducer to acquire a vascular sound signal in order to detect a vascular sound from a cervical, thoracic, abdominal, pelvic, or lower limb region of the person; filtering the vascular sound signal to isolate the vascular sound, said filtering using a filter which attenuates frequencies below a lower cut-off frequency in a range of 100-300 Hz; and analyzing the filtered sound signal in order to determine whether an indication of a dicrotic notch in the vascular sound exceeds a set threshold.

A multichannel stethographic device includes a plurality of individual stethoscopes that may be embedded in a foam pad or surface mounted on a thin flexible substrate. Additional stethoscopes for the heart and thorax may also be utilized. The system may include a signal conditioning circuit, wireless DAQ module, and software (algorithms). The systems may be configured to identify and diagnose various disease conditions such as pneumonia, chronic obstructive pulmonary disease (COPD), asthma, congestive heart failure (CHF), interstitial pulmonary fibrosis (IPF), and vocal cord dysfunction (VCD).

This system is a network of sensor nodes with multiple sensors at each node. The nodes are used in combination with a wearable garment to enable multiple types of data to be combined together to produce a fuller picture of a body's physiological state; such as during physical therapy. In addition, the system utilizes acoustic imaging to measure muscle activation. The system transmit this data to a host computer to visualize various data comparisons.