569 results about "High pitch" patented technology

A communications system, such as part of a real-time location system, includes a transmitter that can be part of a location processor, tag emission reader or tag interrogator that generates a frequency shift key (FSK) modulated wireless communication signal representative of digital data and transmits the communications signal over a wireless communications channel. A receiver such as incorporated within a tag transceiver used in the real-time location system receives the FSK modulated communication signal. The receiver includes a circuit for calculating the magnitude of low and high tones of the FSK modulated communication signal and a threshold for amplitude shift keyed (ASK) channel data and FSK channel data to derive the digital data even in the presence of on-tone jammers in the communications channel.

The disclosed auto gain volume control method for communication comprises: pre-defining voice flow state to decide in transmission for AGC and smooth transition from high pitch to silence. This invention overcomes defects of volume and voice discontinuity, and fit for video conference.

A solid stage audio power amplifier comprises of two output stages with one generating the real output signal that drives the real loud speaker load and the other mimicking the real output stage and generating a dummy output signal that drives a dummy resistor load. A frequency dependent feedback selection network, denoted as Feedback-Shifting network hereafter, is implemented between the two outputs and the input of the amplifier to fulfill a unique global feedback loop. In a particular embodiment, the Feedback-Shifting network can be constructed so that it receives more feedback information from the real output node than from the dummy output node at low frequencies, but less feedback information from the real output node than from the dummy output node at mid to high frequency bands. Such a power amplifier performs as a traditional solid state feedback amplifier at low frequencies by generating a clear and tight bass, but it sounds similar to an open loop tube amplifier at higher frequencies by reproducing natural mid-band and treble with less listening fatigue.

A speaker device includes first speaker units 2 and 5 and second speaker units 3 and 6 that are arranged symmetrically as viewed from a listening center axis X1-X2. The first speaker units 2 and 5 emit sounds in inward directions and reproduces at least the mid-range and above, and the second speaker units 3 and 6 emit sounds in a front direction and attenuates the treble range. With respect to a listening position in a front direction of one of the speaker systems 1 and 4, a sound arriving to the listening position from the first speaker unit of the speaker system located closer to the listening position, and a sound arriving thereto from the second speaker unit of the same speaker system, are destructive to each other in the mid-range due to a phase difference, whereby a sound pressure in the mid-range arriving from the speaker system located closer to the listening position is attenuated more, as compared with a sound pressure in the mid-range arriving from the speaker system located farther from the listening position. It is possible to achieve an excellent effect of expanding a listening position range for obtaining the center sound image localization, the natural sound quality without sense of discomfort, the large sound pressure reproduction, and the downsizing.

Point source speaker systems are provided. The point source speaker system receives audio input from a device. The system comprises a mountable enclosure, which contains a speaker array. The array includes a substantially forward facing left speaker, a substantially forward facing center speaker, a substantially forward facing right speaker and a horizontally mounted woofer speaker. A woofer tunnel is located behind the left, center and right speakers. The woofer tunnel accelerates woofer sound waves and terminuses at a woofer baffle which leads to a woofer port. The left speaker, center speaker and right speaker may include more than one speaker. One or more of these left speakers and right speakers may be a tweeter. The left speakers receive a left minus right input, the center speakers receive a right plus left input, and the right speakers receive right minus left input.

An earphone with tunable low pitch comprises a main member and a stirring member, wherein the main member has a chamber inside receiving a loud speaker, a low pitch room formed between the main member and the loud speaker, at least a fixing air hole provided at the rear side of the main member, a high pitch room formed between the front side of the main member and the loud speaker, at least a regulative air hole is provided at the high pitch room; the stirring member, which is pivotally joined to the pivot hole, is designed as a disk to close the regulative air hole or as airflow baffles to close corresponding airflow passages gradually such that the regulative air hole or the airflow passages can be partly or fully blocked by the stirring member to change the speed of the air entering or leaving the high pitch room and result in good low frequency resonant effect.

A power efficient, acoustical Helmholtz resonator foghorn including a plurality of electrical emitters, some of which are redundant, arrayed at one end of a blocked tube with a plurality of exhaust ports located therein surrounded by a standoff tubular member. The foghorn tuned to provide a high pitch thus providing a compact horn having an acoustical path capable of producing an exceptional wavelength in a generally concentric horizontal sound propagation the horn configurable for use as either a one-half mile or two mile marine navigational aid for offshore structures, buoys, and the like.

A method for image reconstruction and reducing patient dose, and an imaging system for accomplishing these methods, includes selecting a primary phase of a cardiac cycle and calculating compromised phase regions based on a selected compromised phase value. If the image position is located within the primary phase, then an image is generated at the primary phase. If the image position is not located within the primary phase, but is located within a compromised phase region, then an image is generated at the compromised phase region.

The invention discloses a built-in sound system for thin video equipment, which uses two-fractional frequency labyrinth inverter speaker, and includes the loudspeaker, frequency divider, pilot pipe, box, althorn and sackbut. The structure of box is produced based on the internal space of video equipment and capacity requirement, and the labyrinth pilot pipe is installed on the wall of box cavity. In this invention, maze pilot pipe forms a longer bass channel in the box, to make the bass reflex in the channel for many times and double the strength, then after the collision reflection of the wall and desk, the air audio pressure is enhanced greatly, to achieve a HI-FI sound.

A super tweeter includes a magnetic base, a voice coil, a frame annularly mounted to the magnetic base, a central supporting member mounted on a central portion of the magnetic base, a diaphragm, an annular inner supporting member, and an annular outer supporting member. The diaphragm is connected between an annular outer side of the annular inner supporting member and an annular inner side of the annular outer supporting member. An annular inner side of the annular inner supporting member is engaged with the central supporting member. An annular outer side of the annular outer supporting member is engaged with the frame. The annular inner supporting member and the annular outer supporting member cause the diaphragm to vibrate in a balanced manner, generating super high frequency range of sound waves.

Typically, changes in timbre in an audio reproduction system use analogue or digital filters, either shelving filters (as in the case of bass, treble and loudness controllers) and/or peaking filters (as in the case of speed-and noise-compensation in automotive systems). A problem associated with this implementation lies in the audibility of the phase shift caused by these filters. According to the invention, this and further problems are solved by utilising the crossover network of the system itself—with level adjustable output signals—to attain desired timbre and/or dynamic range adjustments and hence avoiding undesirable phase effects of the traditional bass and treble control filters. An input signal (18) is according to an embodiment of the invention divided by a cross over network (20) into a number of frequency bands and applied via level control means (21, 22, 23) and separate power amplifiers (24, 25, 26) to loudspeaker drivers (27, 28, 29). In this manner, the mentioned phase shifts can be avoided and by proper control of the level adjustment means by a frequency-dependent analysis and weighting network (30), desired adjustment of timbre and dynamic range of the audio reproduction can be achieved. Also control dependent on vehicle speed and/or background noise can be incorporated into the system..

A surround sound system and method involving a surround sound tower (10) having planar speakers (11b); a base plate (20); and a structure for positioning (30) the surround sound tower on the base plate (20), the surround sound tower (10) being mounted on, and normal to, the positioning structure (30) for customizing sound direction and constructive interference patterns by interactively positioning the sound tower (10) and by modular usage of both sub-woofers (12a) and tweeters (13a), economizing floor space, especially in a home theater environment, the positioning structure (30) having a structure for indicating an angular rotation (40) of the surround sound tower (10) relative to the base plate (20) and a structure for facilitating rotation (50) of the angular rotation indicating structure (40).

The invention relates to a thin double-cone phase inversion type loudspeaker box. A box body is mainly composed of a lower shell and an upper shell, wherein a high pitch unit installing hole, a low pitch unit installing hole and a lower shell phase inversion hole are formed in the lower shell, the high pitch unit installing hole and the low pitch unit installing hole are distributed along the long axis direction and are located in the left half portion of the lower shell, the high pitch unit installing hole is close to the left end of the lower shell, the lower shell phase inversion hole is arranged along the long axis direction and is located in the right half portion of the lower shell, and an opening of the lower shell phase inversion hole is located in the right end of the lower shell. A high pitch unit positioning groove, a low pitch unit positioning groove and an upper shell phase inversion hole are formed in the upper shell, wherein the lower shell and the upper shell constitute the box body. A high pitch loudspeaker unit is arranged in the high pitch unit installing hole and the high pitch unit positioning groove, and a subwoofer unit is arranged in the low pitch unit installing hole and the low pitch unit positioning groove. An inverter tube is formed by corresponding combination of the lower shell phase inversion hole and the upper shell phase inversion hole. The thin double-cone phase inversion type loudspeaker box is ingenious and reasonable in structure, and pretty good low frequency tone quality is achieved under the condition that the thin structure of the loudspeaker box is guaranteed.