Abstract: Techniques related to input and output signal synchronization and latency jitter compensation for audio systems are discussed. Such techniques may include determining a number of virtually buffered samples based on a detected latency between an audio capture thread and an audio playback thread and synchronizing an audio input signal and an audio output signal based on the number of virtually buffered samples.

Abstract: Techniques related to input and output signal synchronization and latency jitter compensation for audio systems are discussed. Such techniques may include determining a number of virtually buffered samples based on a detected latency between an audio capture thread and an audio playback thread and synchronizing an audio input signal and an audio output signal based on the number of virtually buffered samples.

Abstract: In order to simplify the setup of telephone conference with distributed conference devices, each conference participant applies speech encoding to its own speech signal in order to reduce the bandwidth of its speech signal thus that the bandwidth compressed speech signal shows at least half of the bandwidth of the data transport channel. Each compressed speech signal is inserted to the data transport channel and that each conference participant extracts the compressed speech signals of the other parties from the data transport channel. Each participant then decodes the compressed speech signals and each conference participant sums up all decoded speech signals to a sum signal.

Abstract: A new modem standard provides reliable in-band transmission of TTY/TDD signals via the speech channel of all digital cellular phone systems. The standard includes error correction such as Forward Error Correction (FEC), and also performs interleaving to spread each TTY/TDD character over several adjacent speech frames. The modem standard can be applied to all speech coding standards and all mobile phone systems. The standard can be implemented using a special interface cable or box between a conventional TTY/TDD device and a mobile phone. The interface can also be integrated directly into new mobile phones, and necessary signal processing can be performed by the mobile's DSP. A new Universal TTY/TDD device can also be provided that supports both modem standards: conventional Baudot code as well as the new modem signals, and implemented using specialized hardware, or using conventional hardware such as a laptop computer with specialized software.