Abstract: Many processes for audio signal processing can benefit from voice activity detection, which aims to detect the presence of speech as opposed to silence or noise. The present disclosure describes, among other things, leveraging energy-based features of voice and insights on first and second formant frequencies of vowels to provide a low-complexity and low-power voice activity detector. A pair of two channels is provided whereby each channel is configured to detect voice activity in respective frequency bands of interest. Simultaneous activity detected in both channels can be a sufficient condition for determining that voice is present. More channels or pairs of channels can be used to detect different types of voices to improve detection and/or to detect voices present in different audio streams.

Abstract: Many processes for audio signal processing can benefit from voice activity detection, which aims to detect the presence of speech as opposed to silence or noise. The present disclosure describes, among other things, leveraging energy-based features of voice and insights on first and second formant frequencies of vowels to provide a low-complexity and low-power voice activity detector. A pair of two channels is provided whereby each channel is configured to detect voice activity in respective frequency bands of interest. Simultaneous activity detected in both channels can be a sufficient condition for determining that voice is present. More channels or pairs of channels can be used to detect different types of voices to improve detection and/or to detect voices present in different audio streams.

Abstract: Many processes for audio signal processing can benefit from voice activity detection, which aims to detect the presence of speech as opposed to silence or noise. The present disclosure describes, among other things, leveraging energy-based features of voice and insights on first and second formant frequencies of vowels to provide a low-complexity and low-power voice activity detector. A pair of two channels is provided whereby each channel is configured to detect voice activity in respective frequency bands of interest. Simultaneous activity detected in both channels can be a sufficient condition for determining that voice is present. More channels or pairs of channels can be used to detect different types of voices to improve detection and/or to detect voices present in different audio streams.

Abstract: Many processes for audio signal processing can benefit from voice activity detection, which aims to detect the presence of speech as opposed to silence or noise. The present disclosure describes, among other things, leveraging energy-based features of voice and insights on first and second formant frequencies of vowels to provide a low-complexity and low-power voice activity detector. A pair of two channels is provided whereby each channel is configured to detect voice activity in respective frequency bands of interest. Simultaneous activity detected in both channels can be a sufficient condition for determining that voice is present. More channels or pairs of channels can be used to detect different types of voices to improve detection and/or to detect voices present in different audio streams.

Abstract: A method and apparatus for selectively invalidating tag data related to data stored in high speed processor cache memory systems. The tag data to be invalidated, due to processor operations and cache memory misses, is stored in two tag stores and indicia related to the tag data to be invalidated is stored in a purge queue. Further improvement in system performance is provided by selective tag data and indicia elimination.

Abstract: A method and apparatus for granting, to a select processor in a multiprocessor computing system, exclusive access to a bus for issuance of address, data and command signals thereover, wherein each processor includes bus lock request and bus lock assert elements which provide corresponding bus request and bus hold signals which are recognized by corresponding elements included in other processors connected to the bus. The bus lock according to the present invention assures the processor having lock status of privacy on the bus necessary to complete a specified operation without interruption from the other processors.

Abstract: A decentralized, pipelined, synchronous bus arbitration scheme which allows almost completely fair arbitration between multiple devices competing for the use of a communication bus while allowing the device that last used the bus faster access to the bus if no other device is competing for its use. The arbitration method and apparatus according to the present invention allows all competing devices equal access to the bus, with the exception that when bus requests are posted simultaneously, the device with the higher priority will always be granted use of the bus first.