Daqarta
Data AcQuisition And Real-Time Analysis
Scope - Spectrum - Spectrogram - Signal Generator
Software for Windows
Science with your Sound Card!
The following is from the Daqarta Help system:

Features:

Oscilloscope

Spectrum Analyzer

8-Channel
Signal Generator

(Absolutely FREE!)

Spectrogram

Pitch Tracker

Pitch-to-MIDI

DaqMusiq Generator
(Free Music... Forever!)

Engine Simulator

LCR Meter

Remote Operation

DC Measurements

True RMS Voltmeter

Sound Level Meter

Frequency Counter
    Period
    Event
    Spectral Event

    Temperature
    Pressure
    MHz Frequencies

Data Logger

Waveform Averager

Histogram

Post-Stimulus Time
Histogram (PSTH)

THD Meter

IMD Meter

Precision Phase Meter

Pulse Meter

Macro System

Multi-Trace Arrays

Trigger Controls

Auto-Calibration

Spectral Peak Track

Spectrum Limit Testing

Direct-to-Disk Recording

Accessibility

Applications:

Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Auditory phenomena

Musical instrument tuning

Animal sound

Evoked potentials

Rotating machinery

Automotive

Product test

Contact us about
your application!

Tempo BPM / msec

Controls: Sgram/PT Dialog >> Pitch-to-MIDI >> Tempo
Changes: TB=n, T=n
Macros: TempoBPM, msTempo

These two controls set the Pitch-to-MIDI tempo for the sounds selected by the Tempo Voice and Percussion buttons.

The BPM (Beats Per Minute) and msec controls are just different ways to set the tempo; changing one causes the other to change to the equivalent value. Since there are 60000 msec per minute,

msec = 60000 / BPM

BPM = 60000 / msec

The controls have an apparent resolution of 1 msec, but the actual tempo beats only happen on trace updates, which are controlled by the Trace Update Interval in the X-Axis Dialog. The default value is 10 msec. Actual updates may happen less often under heavy processor loads, or when interrupted by mouse drags.

Note that Tempo only controls the MIDI note rate; the Pitch Track note rate, and hence the note display, proceeds at the Trace Update rate. For example, with Trace Update at 10 msec (equivalent to a Tempo of 6000 BPM) and Tempo at 600 BPM, only one-tenth of the tracked (and displayed) notes will be converted to MIDI notes.

The tempo clock maintains the specified average tempo, even if the beat-to-beat interval varies. For example, suppose trace updates are every 10 msec and Tempo is set to 187 msec (about 320 BPM). The beats are thus constrained to times divisible by 10, so the first 5 beats arrive at 190, 380, 570, 750, 940, and 1130 msec instead of 187, 374, 561, 748, 935, and 1122 msec. There is a jitter of up to 10 msec past the target beat time, but there is no cumulative error.


MIDI Changes Script:

Use TB=n to set the tempo to n BPM.

Use T=n to set the tempo to n msec.

Note that n may be any valid integer variable or expression, including current MIDI control values, random values, current computer keyboard states or mouse position, input or buffered notes, or oscillators.

The value for BPM will be limited to the range of 30 to 6000.

The value for msec will be limited to the range of 10 to 2000.


Macro Notes:

TempoBPM=300 sets Tempo to 300 BPM. Alternatively, msTempo=200 sets the equivalent 200 msec.

Either control may be incremented or decremented by one. TempoBPM=>1 increments BPM by one. msTempo=>-1 decrements msec by one.


See also Pitch-to-MIDI dialog, Pitch Track Toolbox - Overview, Spectrogram / Pitch Track Controls, Spectrogram / Pitch Track (Sgram/PT)

GO:

Questions? Comments? Contact us!

We respond to ALL inquiries, typically within 24 hrs.
INTERSTELLAR RESEARCH:
Over 30 Years of Innovative Instrumentation
© Copyright 2007 - 2017 by Interstellar Research
All rights reserved