Methods, system and/or computer program products for detection of a note include receiving an audio signal and generating a plurality of frequency domain representations of the audio signal over time. A time domain representation is generated from the plurality of frequency domain representations. A plurality of edges are detected in the time domain representation and the note is detected by selecting one of the plurality of edges as corresponding to the note based on characteristics of the time domain representation.

Methods, systems and computer program products for detecting musical notes in an audio signal

The present invention discloses a method for performing a frame erasure concealment to a higher-band signal, including: calculating a periodic intensity of a higher-band signal with respect to a lower-band signal; judging whether the periodic intensity of the higher-band signal is higher than or equal to a preconfigured threshold; if the periodic intensity of the higher-band signal is higher than or equal to the preconfigured threshold, using a pitch period repetition method to perform the frame erasure concealment to the higher-band signal of a current lost frame; and if the periodic intensity of the higher-band signal is lower than the preconfigured threshold, using a previous frame data repetition method to perform the frame erasure concealment to the higher-band signal of the current lost frame. The present invention further discloses a device for performing a frame erasure concealment to a higher-band signal and a speech decoder. The problem that the quality of the voice signal is lowered is avoided.

Method and device for performing frame erasure concealment to higher-band signal

In an audio signal processing apparatus, a generation section generates an audio signal representing a voice. A distribution section distributes the audio signal generated by the generation section to a first channel and a second channel, respectively. A delay section delays the audio signal of the first channel relative to the audio signal of the second channel for creating a phase difference between the audio signal of the first channel and the audio signal of the second channel such that the created phase difference has a duration corresponding to either an added value of a first duration which is approximately one half of a period of the audio signal generated by the generation section and a second duration which is set shorter than the first duration, or a difference value of the first duration and the second duration. An addition section adds the audio signal of the first channel and the audio signal of the second channel with one another, between which the phase difference is created by the delay section, and outputs the added audio signal which represents natural voice with various characteristics.

Apparatus for and program of processing audio signal

The present invention is aimed at signal modification before pitch period repetition for the synthesis of blocks lost when decoding digital audio signals. The effects of repetition of transients, such as plosives of a speech signal, are avoided by comparing the samples of a pitch period with those of the previous pitch period. The signal is preferentially modified by taking the minimum between a current sample (e(3)) of the last pitch period (Tj) and at least one sample (e(2-T0)) of substantially the same position in the previous pitch period (Tj-1).

Synthesis of lost blocks of a digital audio signal, with pitch period correction

In a voice packet communication system, a voice packet loss concealment device compensates for the deterioration of voice quality due to voice packet loss. In the device, a detecting section detects a loss of a voice packet and outputting information; an estimating section estimates the voice characteristics of the lost segment using a pre-loss voice packet received before the lost segment or a post-loss voice packet received after the lost segment; a pitch signal generating section generates a pitch signal having the voice characteristics; and a lost packet generating section outputs the pitch signal generated by the pitch signal generating section, with the voice characteristics estimated by the estimating section, which allows abnormal noise and feeling of mute, subjective deterioration of naturalness and continuity to be improved, and the voice packet loss concealment to be further improved.

Voice packet loss concealment device, voice packet loss concealment method, receiving terminal, and voice communication system

A pitch period of a signal is estimated by identifying a peak candidate of the signal as a peak and estimating the pitch period of the signal based on a time difference between the identified peak and a previous peak of the signal. An error-concealment apparatus (202) includes a history block (204) for storing signal data input to a decoder, an error likelihood detector, and a pitch period estimator. The error likelihood detector (208) directs an input of the decoder to data of the signal data in the history block offset an estimated signal pitch period back in time responsive to a determination that data from a receiver has been lost or corrupted. The pitch period estimator (206) estimates the pitch period of the signal via identification of peaks of the signal data.

Method of and apparatus for pitch period estimation

In a voice communication system such as the Bluetooth Short Range Radio System, wherein transmission of voice information through an air interface is represented by a succession of frames of signal data samples respectively contained in a succession of pitch synchronous frames, and wherein one or more of the data frames may be lost due to interference, a method is disclosed for improving quality of voice information at the system receiver. The method includes the steps of computing a threshold value associated with a particular pitch synchronous frame, and selectively comparing an average magnitude of the particular pitch synchronous frame with the threshold value to detect loss of a data frame contained in the particular pitch synchronous frame. When loss is detected, the loss is concealed at the receiver by replacing the particular pitch synchronous frame with a replica of the pitch synchronous frame which immediately precedes the particular frame in the succession of pitch synchronous frames.

Error concealment for voice transmission system

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Method of and apparatus for pitch period estimation

Error concealment for voice transmission system