Hi All I want to know what is the purpose and application of finding zero crossing of waves? Thanks.
Zero crossing
Started by ●July 31, 2009
Reply by ●July 31, 20092009-07-31
On Jul 31, 8:45�am, "Jasir" <k.s...@hotmail.com> wrote:> Hi All > > I want to know what is the purpose and application of finding zero > crossing of waves? > > Thanks.It has been used as a computationally efficient albeit crude measure of frequency. For example the zero crossing rate plays a strong role is deciding whether or not a segment of human speech is voiced (i.e. caused by vibrations from the vocal chords) Clay
Reply by ●July 31, 20092009-07-31
On 31 Jul, 14:45, "Jasir" <k.s...@hotmail.com> wrote:> Hi All > > I want to know what is the purpose and application of finding zero > crossing of waves?Some people use it as a quick'n dirty way of estimating the frequency of the wave. Rune
Reply by ●July 31, 20092009-07-31
>I want to know what is the purpose and application of finding zero >crossing of waves?"A Zero Crossing-Based Spectrum Analyzer", Steven M. Kay and R. Sudhaker, "IEEE Transactions on Acoustics, Speech, and Signal Processing", Vol. ASSP-34, No. 1, February 1986. "Comments on 'A zero crossing-based spectrum analyzer'; by S.M. Kayand R. Sudhaker" Edwards, P.J. Acoustics, Speech and Signal Processing, IEEE Transactions on Volume 37, Issue 7, Jul 1989 Page(s):1143 - 1144
Reply by ●July 31, 20092009-07-31
Jasir wrote:> Hi All > > I want to know what is the purpose and application of finding zero > crossing of waves?Zero crossing symbol synchronizer. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●July 31, 20092009-07-31
On Jul 31, 5:45�am, "Jasir" <k.s...@hotmail.com> wrote:> Hi All > > I want to know what is the purpose and application of finding zero > crossing of waves? > > Thanks.Used in limiters for FM. Not a great idea at all though. Zero crossing have noise.
Reply by ●July 31, 20092009-07-31
HardySpicer wrote:> On Jul 31, 5:45 am, "Jasir" <k.s...@hotmail.com> wrote: >> Hi All >> >> I want to know what is the purpose and application of finding zero >> crossing of waves? >> >> Thanks. > > Used in limiters for FM. Not a great idea at all though. > Zero crossing have noise.A poor way to look at it. The limiter clips out the AM noise, and all the information that remain is in the zero-crossing timings. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●July 31, 20092009-07-31
On Jul 31, 4:14�pm, Jerry Avins <j...@ieee.org> wrote:> HardySpicer wrote: > > On Jul 31, 5:45 am, "Jasir" <k.s...@hotmail.com> wrote: > >> Hi All > > >> I want to know what is the purpose and application of finding zero > >> crossing of waves? > > >> Thanks. > > > Used in limiters for FM. Not a great idea at all though. > > Zero crossing have noise. > > A poor way to look at it. The limiter clips out the AM noise, and all > the information that remain is in the zero-crossing timings. > > Jerry > -- > Engineering is the art of making what you want from things you can get. > �����������������������������������������������������������������������If you want to mute an audio signal with minimal "click" sound, it's best to do it on a zero-crossing. Bob Adams
Reply by ●August 1, 20092009-08-01
On Jul 31, 6:35�pm, Robert Adams <robert.ad...@analog.com> wrote:> On Jul 31, 4:14�pm, Jerry Avins <j...@ieee.org> wrote: > > > > > HardySpicer wrote: > > > On Jul 31, 5:45 am, "Jasir" <k.s...@hotmail.com> wrote: > > >> Hi All > > > >> I want to know what is the purpose and application of finding zero > > >> crossing of waves? > > > >> Thanks. > > > > Used in limiters for FM. Not a great idea at all though. > > > Zero crossing have noise. > > > A poor way to look at it. The limiter clips out the AM noise, and all > > the information that remain is in the zero-crossing timings. > > > Jerry > > -- > > Engineering is the art of making what you want from things you can get. > > ����������������������������������������������������������������������� > > If you want to mute an audio signal with minimal "click" sound, it's > best to do it on a zero-crossing. > > Bob AdamsOn a side note, are there useful and practical tips that anyone cares to share on how to accurately and efficiently interpolate the zero crossing of a sine wave? I mean higher order than linear, and just a handful of surrounding points available (no FFT). John
Reply by ●August 1, 20092009-08-01
John <sampson164@gmail.com> wrote:>On a side note, are there useful and practical tips that anyone cares >to share on how to accurately and efficiently interpolate the zero >crossing of a sine wave? I mean higher order than linear, and just a >handful of surrounding points available (no FFT).In this particular case, or any other case where a linear interpolator is not adequate, I like to use a 4-point Lagrangian interpolator. It is almost always adequate. An interesting problem is whether you can simplify the computation if all you need are the zero crossing times. Steve
