Abstract: In at least one embodiment, a headphone listening apparatus including an audio listening device is provided. The audio listening device is programmed to receive an incoming ambient audio signal indicative of an external ambient sound and to store a plurality of desired audio triggers. The audio listening device is further programmed to compare the external ambient sound to the plurality of desired audio triggers and to transmit a notification signal to headphones in response to the ambient sound being generally similar to a first desired audio trigger of the plurality of desired audio triggers. The headphones are programmed to provide an audio alert to a user to indicate the presence of the external ambient sound.

Abstract: An apparatus used to communicate with a plurality of audio/video (A/V) end nodes in an Audio Video Bridging (AVB) network. The apparatus may include a first A/V end node. The first A/V end node may be configured to transmit a clock reference stream including a plurality of timestamps to a plurality of A/V end nodes. The plurality of A/V end nodes may transmit a media stream including a plurality of video samples and a plurality of audio samples to one another. The media stream may be separate from the plurality of timestamps. The plurality of A/V end nodes may be arranged to syntonize or synchronize the plurality of video samples and the plurality of audio samples with one another for playback in response to the plurality of timestamps.

Abstract: In at least one embodiment, a headphone listening apparatus including an audio listening device is provided. The audio listening device is programmed to receive an incoming ambient audio signal indicative of an external ambient sound and to store a plurality of desired audio triggers. The audio listening device is further programmed to compare the external ambient sound to the plurality of desired audio triggers and to transmit a notification signal to headphones in response to the ambient sound being generally similar to a first desired audio trigger of the plurality of desired audio triggers. The headphones are programmed to provide an audio alert to a user to indicate the presence of the external ambient sound.

Abstract: A network media adapter includes peripheral interfaces for connection to connectors of audio/video (“A/V”) sources and sinks to respectively receive media data from the A/V sources and to transmit media data to the A/V sinks. Components are configured to syntonize or synchronize local media clocks of the A/V sources and sinks to ensure media data integrity affiliated with a protocol of a media network over which the media data is transported. A quality of service (QoS)-compliant media interface is integrated in the network media adapter through which to send and receive processed A/V media data to and from the media network according to the protocol. Other components may be configured to process, encapsulate, and transport over the media network the media data received from the A/V sources. Still other components may be configured to receive media data from the media network and decapsulate, process, and transmit the media data through one or more peripheral interfaces connected to the A/V sinks.

Abstract: In at least one embodiment, a headphone listening apparatus including an audio listening device is provided. The audio listening device is programmed to receive an incoming ambient audio signal indicative of an external ambient sound and to store a plurality of desired audio triggers. The audio listening device is further programmed to compare the external ambient sound to the plurality of desired audio triggers and to transmit a notification signal to headphones in response to the ambient sound being generally similar to a first desired audio trigger of the plurality of desired audio triggers. The headphones are programmed to provide an audio alert to a user to indicate the presence of the external ambient sound.

Abstract: In at least one embodiment, a headphone listening apparatus including an audio listening device is provided. The audio listening device is programmed to receive an incoming ambient audio signal indicative of an external ambient sound and to store a plurality of desired audio triggers. The audio listening device is further programmed to compare the external ambient sound to the plurality of desired audio triggers and to transmit a notification signal to headphones in response to the ambient sound being generally similar to a first desired audio trigger of the plurality of desired audio triggers. The headphones are programmed to provide an audio alert to a user to indicate the presence of the external ambient sound.

Abstract: An apparatus used to communicate with a plurality of audio/video (A/V) end nodes in an Audio Video Bridging (AVB) network. The apparatus may include a first A/V end node. The first A/V end node may be configured to transmit a clock reference stream including a plurality of timestamps to a plurality of A/V end nodes. The plurality of A/V end nodes may transmit a media stream including a plurality of video samples and a plurality of audio samples to one another. The media stream may be separate from the plurality of timestamps. The plurality of A/V end nodes may be arranged to syntonize or synchronize the plurality of video samples and the plurality of audio samples with one another for playback in response to the plurality of timestamps.

Abstract: A system may be provided for synchronizing a first media stream with a second media stream. A first receiver in the system may receive the first media stream over a network. A second receiver in the system may receive the second media stream over the network. The second receiver may determine an identity of a content delay matching stream that indicates the amount of processing delay introduced in the first media stream by a processing component of the first receiver or transmitter. The second receiver may subscribe to the identified content delay matching stream. The second receiver may receive the content delay matching stream over the network and determine the processing delay from the content delay matching stream. The receiver may cause the second media stream to be delayed in accordance with the processing delay in the first media stream such that the first and second media streams are synchronized.

Abstract: A network communication system includes a central control system that may transmit a request packet over a network to an apparatus that is configured to operate in an alarm system. The alarm system may be configured in accordance with a standard or protocol. The request packet may include instructions that instruct the apparatus to perform one or more tests that determine whether the apparatus is compliant with the standard or protocol. The apparatus may be configured to receive the packet from over the network and perform the tests in accordance with the instructions. The apparatus may report test results of the tests to the central control system by sending a reply packet that includes the test results over the network to the central control system.

Abstract: A network communication system includes a listener that receives a plurality of data streams from a talker. The data in the data streams may be identical. The listener identifies one of the data streams as a primary data stream and another of the plurality of data streams as a non-primary data stream. The listener may process data in the primary data stream, and may buffer a minimal amount of data in the non-primary data stream. In the event of a failure or disruption in reception of the primary data stream, the listener may switch over to processing the data in the non-primary data stream. The switch over to processing the non-primary data may be performed in a manner that ensures lossless failover.

Abstract: A network communication system includes a talker that may communicate a data stream having an optimal presentation time to a plurality of listeners over a network, such as an Ethernet Audio/Video Bridging network. The optimal presentation time may be determined by a maximum latency among a plurality of latencies for connections between the talker and the listeners. A controller may communicate with the listeners to determine the maximum latency. The controller may also provide the maximum latency to the talker and the listeners. The talker may determine the optimal presentation time based on the maximum latency. The listeners may allocate an optimum amount of resources to buffer the data stream before the data in the data stream is presented.

Abstract: A system generates one or more media streams from time-stamped packets received over a network. The packets may include audio, video, or a combination of both, sampled at a rate determined by a master media clock at a transmitter of the time-stamped packets or at some other node on the network. Timestamps in the packets may be presentation times based on values of a remote real-time clock at the transmitter that is synchronized with a local real-time clock at a receiver. The system may generate the media streams from the media stream samples and present the sampled data according to the presentation times.

Abstract: A system may route media stream samples in time-stamped packets to a media interface. The system may determine a hash value from a stream identifier that identifies a source media stream corresponding to the media stream samples. The hash value may be determined based on a combination of a first portion of the stream identifier and a second portion of the stream identifier. The system may determine whether the stream identifier identifies a subscribed media stream by looking up the hash value in a hash table. The system may route the media stream samples to a media interface if source media stream is a subscribed media stream.

Abstract: A network communication system includes a central control system that may transmit a request packet over a network to an apparatus that is configured to operate in an alarm system. The alarm system may be configured in accordance with a standard or protocol. The request packet may include instructions that instruct the apparatus to perform one or more tests that determine whether the apparatus is compliant with the standard or protocol. The apparatus may be configured to receive the packet from over the network and perform the tests in accordance with the instructions. The apparatus may report test results of the tests to the central control system by sending a reply packet that includes the test results over the network to the central control system.

Abstract: A network communication system includes a listener that receives a plurality of data streams from a talker. The data in the data streams may be identical. The listener identifies one of the data streams as a primary data stream and another of the plurality of data streams as a non-primary data stream. The listener may process data in the primary data stream, and may buffer a minimal amount of data in the non-primary data stream. In the event of a failure or disruption in reception of the primary data stream, the listener may switch over to processing the data in the non-primary data stream. The switch over to processing the non-primary data may be performed in a manner that ensures lossless failover.

Abstract: A network communication system includes a talker that may communicate a data stream having an optimal presentation time to a plurality of listeners over a network, such as an Ethernet Audio/Video Bridging network. The optimal presentation time may be determined by a maximum latency among a plurality of latencies for connections between the talker and the listeners. A controller may communicate with the listeners to determine the maximum latency. The controller may also provide the maximum latency to the talker and the listeners. The talker may determine the optimal presentation time based on the maximum latency. The listeners may allocate an optimum amount of resources to buffer the data stream before the data in the data stream is presented.

Abstract: A memory management unit (MMU) may buffer media stream samples of one or more media streams, such as audio and/or video streams, in a buffer. The MMU may determine how much time a media stream sample is to be buffered by comparing a value of a real-time clock with a timestamp associated with the media stream sample. The MMU may determine a target output block in the buffer for the media stream sample based on the period of a media clock and on the amount of buffer time that the media stream sample is to be buffered. The target output block is determined relative to an output block identified by a read address. The MMU may store the media stream sample in the target output block. The MMU may increase or decrease the read address at a rate determined by the media clock.

Abstract: A system recovers a local media clock from a master media clock based on time-stamped packets received from a transmitter. The packets may include audio, video, or a combination of both, sampled at a rate determined by the master media clock at the transmitter. Timestamps in the packets may be based on values of a remote real-time counter at the transmitter that is synchronized with a local real-time counter at a receiver. The local media clock may be syntonized with the master media clock through the clock periods. The clocks may be synchronized by syntonizing the clocks and adjusting the phase of the local media clocks based on timestamps and a real-time counter.

Abstract: A network media adapter includes peripheral interfaces for connection to connectors of audio/video (“A/V”) sources and sinks to respectively receive media data from the A/V sources and to transmit media data to the A/V sinks. Components are configured to syntonize or synchronize local media clocks of the A/V sources and sinks to ensure media data integrity affiliated with a protocol of a media network over which the media data is transported. A quality of service (QoS)-compliant media interface is integrated in the network media adapter through which to send and receive processed A/V media data to and from the media network according to the protocol. Other components may be configured to process, encapsulate, and transport over the media network the media data received from the A/V sources. Still other components may be configured to receive media data from the media network and decapsulate, process, and transmit the media data through one or more peripheral interfaces connected to the A/V sinks.

Abstract: A system may be provided for synchronizing a first media stream with a second media stream. A first receiver in the system may receive the first media stream over a network. A second receiver in the system may receive the second media stream over the network. The second receiver may determine an identity of a content delay matching stream that indicates the amount of processing delay introduced in the first media stream by a processing component of the first receiver or transmitter. The second receiver may subscribe to the identified content delay matching stream. The second receiver may receive the content delay matching stream over the network and determine the processing delay from the content delay matching stream. The receiver may cause the second media stream to be delayed in accordance with the processing delay in the first media stream such that the first and second media streams are synchronized.