Disclosed herein are example embodiments of systems and methods of braille transceiving. A braille input output transceiving device (BIOTD) comprises a transceiving module configured to receive braille codes, encode the braille codes into DTMF tones, and transmit the DTMF tones. The BIOTD enables transmission over various types of media, including audio DTMF tones and any networked communication device that can accept audio tones in the appropriate format.

A system and method for processing a plurality of channels, for example audio channels, in parallel is provided. For example, a plurality of telephony channels are processed in order to detect and respond to call progress tones. The channels may be processed according to a common transform algorithm. Advantageously, a massively parallel architecture is employed, in which operations on many channels are synchronized, to achieve a high efficiency parallel processing environment. The parallel processor may be situated on a data bus, separate from a main general-purpose processor, or integrated with the processor in a common board or integrated device. All, or a portion of a speech processing algorithm may also be performed in a massively parallel manner.

Provided is a visitor identification system, including: a wireless transmitter; a visitor application; and a management server; wherein the wireless transmitter is installed by a resident and transmits a near field wireless signal; wherein the visitor application receives the near field wireless signal from the wireless transmitter, extracts a first identifier from the wireless transmitter, and transmits the first identifier to the management server, wherein the first identifier is unique to the wireless transmitter; wherein the management server receives the first identifier from the visitor application and performs one or more predetermined tasks so that a resident can verify identity of a visitor.

A method of quick set up of PSTN modem connection is proposed. The method of quick set up of PSTN modem connection comprises: setting access to the data channel, identifying channel characteristics, configuring PSTN modems depending on the characteristics of the channel, configuring echo compensators of PSTN modems, negotiating the connection protocol and data transfer between PSTN modems according to the configuration using the agreed protocol where: data transmission is carried out in duplex mode with the separation of signals of reception and transmission by echo compensation, identification of channel characteristics and adjustment of the echo compensator of each of the PSTN modems is performed, respectively, when receiving and transmitting at least one training sequence by each PSTN modem, access to the data channel is carried out by sending call by PSTN modem, which contains the training sequence and connection parameters for negotiation, where using a multiple access protocol, when each of the PSTN modems is connected to the data channel asynchronously, without agreeing on the time of connection and without the need to pre-allocate the roles of calling and responding modems.

A method for operating a first access service depends on the presence of a second access service. The method includes conducting at least one measurement by the first access service and determining based on the at least one measurement whether or not a power spectral density used by the first access service is adjusted.

The technology disclosed herein enables automatic specification of audio transmission characteristics for calls between endpoints. In a particular embodiment, a method includes presenting a query to a user of a first endpoint about a type of call to be established with a second endpoint. The type of call is one of a plurality of call types that respectively correspond to different audio transmission characteristics. The method further includes configuring an audio transmission characteristic based on a response to the query and establishing a call between the first endpoint and the second endpoint using the audio transmission characteristic.

Sharing data by defining a data encoding table, maintaining a data record database, defining a data encryption code, providing the data encryption code with an outgoing call, receiving an audio response including encrypted data, decrypting the encrypted data, and updating the data record database according to the data.

Described herein are systems configured for carrier aggregation. Systems include a multiplexing circuit having a filter assembly, switching circuit with a switching path, and a switchable impedance. The filters can be designed so that when operated simultaneously (e.g., during multi-band operation) the same inductance can be used allowing the switching network to switch in a particular inductance into the path. The described systems can include an inductance that is coupled to an output port so that when operating in single-band mode, the different paths share the same inductance. Relative to other solutions, the described systems can improve performance (e.g., reduce insertion loss), reduce the number of components in the associated module, reduce manufacturing costs, and the like.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium for communicating between an operational asset and a backend network that include the actions of receiving first data from an operational asset through a first communication interface that is configured to communicate with an operational asset, and where the first data is formatted according to a first data format that is specific to the operational asset. Processing the first data according to an asset template to generate second data, where the second data includes the first data and being formatted according to a second data format that is specific to the backend network. Causing the second data to be transmitted to the backend network by a second communication interface that is configured to communicate with a backend network.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium for communicating between an operational asset and a backend network that include the actions of receiving first data from an operational asset through a first communication interface that is configured to communicate with an operational asset, and where the first data is formatted according to a first data format that is specific to the operational asset. Processing the first data according to an asset template to generate second data, where the second data includes the first data and being formatted according to a second data format that is specific to the backend network. Causing the second data to be transmitted to the backend network by a second communication interface that is configured to communicate with a backend network.