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Play audio in trick mode

A technology for playing audio and audio, which is applied in speech analysis, data recording, instruments, etc., and can solve problems such as increasing the audio pitch and doubling the frequency heard by the listener

Active Publication Date: 2016-10-05
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method results in an increase in the pitch of the audio since the decimated samples are played back at the original sample rate
Decimation by half results in doubling the frequencies heard by the listener

Method used

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  • Play audio in trick mode
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Examples

Experimental program
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Embodiment Construction

[0064] figure 1 An example of the fast-forward mode according to the comparative example is shown. In the figures, the horizontal axis represents the time index within a digital audio file such as an MP3 file. Fast-forward mode operates between played clips by playing intermittent clips and skipping other clips in the file. Play the first segment of audio samples for a fixed duration of d milliseconds (ms). Skip subsequent segments of duration (n-1)d ms. Here, n is the trick mode speed (eg, 2x, 4x, ...). Decrease the duration of the played audio by a factor of 1 / n by playing d ms and skipping (n-1) d ms. That is, for every nd ms of audio recorded in the file, only d ms are played. The duration d of the played segment can be appropriately selected in order to enhance clarity. Very small d will not be clear. Experiments have shown that usually 300ms to 700ms is an appropriate range for d. The value used in the examples described below is 500 ms.

[0065] figure 2 An e...

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PUM

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Abstract

A method of playing back a digital audio signal at a different speed than it was recorded. The method includes: playing a first segment of the signal; jumping to a second segment that is not adjacent to the first segment; and playing the second segment, wherein the playback is performed at a rate different from that at which at least one of the first and second segments were recorded At least one of the first and second fragments.

Description

technical field [0001] The present invention relates to playback of digital audio. In particular, the present invention relates to techniques for playing audio in so-called "trick" modes (eg, fast-forward or fast-rewind). Background technique [0002] The digital audio signal includes a sequence of digital samples representing the recorded sound. A recording is characterized by a sampling rate, usually expressed as a frequency in Hz, ie, the number of samples per unit time. For example, the sampling rate for audio compact discs is 44.1 kHz. In order to reproduce the recorded sound in normal playback, the samples are played back at their original sampling rate, that is, at the sampling rate at which they were recorded. Playback involves converting digital samples to analog signals using a digital-to-analog converter (DAC). [0003] Various methods are known in the art for implementing fast forward or fast rewind of digital audio. A first method for fast forwarding consis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B27/00
CPCG11B27/005G10L25/90G11B27/00
Inventor 加勒西·桑穆加孙达拉姆素密·雅伊斯韦尔
Owner NXP BV