Systems and methods for volume control over intercom trunk lines. One example method includes receiving, from a first keypanel coupled to a first intercom, a call request identifying a remote keypanel coupled to a second intercom. The method includes transmitting a trunk request based on the call request and receiving a trunk setup message. The method includes activating a first crosspoint to provide a two-way audio connection between the first and second intercom devices. The method includes applying a trunk gain value to the first crosspoint based on the remote keypanel and transmitting, with an audio gain based on the trunk gain value, an audio stream received from the first keypanel. The method includes receiving, from the second intercom, a gain adjustment value associated with the first keypanel and the remote keypanel and applying an adjusted trunk gain value to the first crosspoint based on the gain adjustment value.

An image recognition-based electric speaker includes a U-shaped iron for increasing magnetic field and improving anti-magnetism, a magnet installed on the U-shaped iron for generating magnetic field, a washer installed on the magnet for increasing the magnetic field and magnetic permeability, a voice coil installed on the washer for electrically conducting power, a voice coil paper tube installed on the voice coil, a damper installed around the voice coil for maintaining the magnetic gap and improving the capability of withstanding power, a box holder mounted around the low-frequency suspension edge, a gasket installed at the lower edge of the box holder for sealing the box holder airtightly, a low-frequency suspension edge disposed around the mid-frequency vibrating plate, a high-frequency anti-dust cap installed on the voice coil paper tube, and a mid-frequency vibrating plate disposed around the anti-dust cap. This invention has the effect of reducing criminal activities.

The present invention discloses an integrated karaoke device, including a microphone and a sound box. The sound box includes a sound chamber containing a loudspeaker. The integrated karaoke device further includes a connecting part made of flexible material that is fixedly connected between a bottom of the microphone and a top of the sound chamber. The use of a flexible material connecting part rather than a solid structural part reduces the transmission to the microphone of sound vibration generated by the sound box. The beneficial effect of implementing the present invention is that a flexible material connecting part is fixedly connected between the bottom of the microphone and the top of the sound chamber, and meanwhile, a gap is kept between the bottom of a printed circuit board (PCB) and the top of the sound chamber; and because the flexible material connecting part can effectively reduce sound vibration, the transmission of vibration to the microphone from the sound box can be effectively eliminated, thereby preventing squealing, and enabling integration of the microphone and the sound box for use in karaoke.

A voice amplification apparatus is provided and configured to attach to a portion of a personal protective equipment (PPE) device such that the apparatus is hands-free and in close proximity to a user's mouth. The voice amplification apparatus comprises a speaker and microphone in various positions, wherein the microphone is configured to capture the user's voice which is amplified and projected out of the speaker. In this way, the user can be clearly heard by those in proximity to the user. Advantageously, the usefulness of the apparatus will prevent users from lowering their PPE to communicate which poses a safety hazard during a pandemic, such as COVID-19.

A voice amplification apparatus is provided and configured to attach to a portion of a personal protective equipment (PPE) device such that the apparatus is hands-free and in close proximity to a user's mouth. The voice amplification apparatus comprises a speaker and microphone in various positions, wherein the microphone is configured to capture the user's voice which is amplified and projected out of the speaker. In this way, the user can be clearly heard by those in proximity to the user. Advantageously, the usefulness of the apparatus will prevent users from lowering their PPE to communicate which poses a safety hazard during a pandemic, such as COVID-19.

An audio sharing system is configured to operate in at least two modes of operation. In a private mode, the audio sharing system outputs sound only to a user and may isolate the user from the surrounding acoustic environment. In a public mode of operation, the audio sharing system broadcasts sound to the user and to any other listeners in proximity to the user, thereby sharing sound in a social manner. The audio sharing system may also operate in other modes of operation that allow the selective sharing of sounds.

An audio sharing system is configured to operate in at least two modes of operation. In a private mode, the audio sharing system outputs sound only to a user and may isolate the user from the surrounding acoustic environment. In a public mode of operation, the audio sharing system broadcasts sound to the user and to any other listeners in proximity to the user, thereby sharing sound in a social manner. The audio sharing system may also operate in other modes of operation that allow the selective sharing of sounds.

A system includes a microphone mounted inside a vehicle, a speaker mounted outside the vehicle, a camera with a field of view encompassing a seat of the vehicle, and a computer in communication with the microphone, speaker, and camera. The computer is programmed to, in response to data from the camera indicating a gesture by an occupant of the seat, activate the speaker to broadcast based on data transmitted by the microphone.

The present invention discloses an integrated karaoke device, including a microphone and a sound box. The sound box includes a sound chamber containing a loudspeaker. The integrated karaoke device further includes a connecting part made of flexible material that is fixedly connected between a bottom of the microphone and a top of the sound chamber. The use of a flexible material connecting part rather than a solid structural part reduces the transmission to the microphone of sound vibration generated by the sound box. The beneficial effect of implementing the present invention is that a flexible material connecting part is fixedly connected between the bottom of the microphone and the top of the sound chamber, and meanwhile, a gap is kept between the bottom of a printed circuit board (PCB) and the top of the sound chamber; and because the flexible material connecting part can effectively reduce sound vibration, the transmission of vibration to the microphone from the sound box can be effectively eliminated, thereby preventing squealing, and enabling integration of the microphone and the sound box for use in karaoke.

An audio sharing system is configured to operate in at least two modes of operation. In a private mode, the audio sharing system outputs sound only to a user and may isolate the user from the surrounding acoustic environment. In a public mode of operation, the audio sharing system broadcasts sound to the user and to any other listeners in proximity to the user, thereby sharing sound in a social manner. The audio sharing system may also operate in other modes of operation that allow the selective sharing of sounds.