To tune using natural harmonics, touch each string lightly at the middle point of your string that divides your string in half (halfway between the nut and the bridge), and pull your bow across each string.
Some bassists find it helpful to use harmonics when they tune. If the pitch of the open string sounds higher than the correct pitch, gently turn the tuning key (machine peg) to the left. If the pitch of the open string sounds lower than the correct pitch, gently turn the tuning key (machine peg) to the right until it reaches the correct pitch. Although early basses used wooden pegs like other stringed instruments, most basses today use machine pegs with a geared tuning mechanism to adjust the strings (called tuning machines). Although the notated notes above are typically used to tune the bass, the actual pitch of the bass open strings will sound like the following notes: E1, A1, D2 and G2 The bass is a transposing instrument, meaning the note played sounds an octave below the notated pitch. “Improving Perceived Bass and Reconstruction of High Frequencies for Band Limited Signals.” Proceedings 1st IEEE Benelux Workshop on Model Based Coding of Audio (MPCA-2002), November 15, 2002, 59–71.More tuning assistance: Violin Tuning, Viola Tuning, Cello Tuning Aarts, Ronald M, Erik Larsen, and Daniel Schobben. Performance is improved in this mode without compromising the ability to tune parameters. Note that it is also possible to generate a MEX-file from this function using the codegen command. The plugin's parameters are tuned by setting their values to the input arguments Fcutoff and G, respectively. The function instantiates an audiopluginexample.BassEnhancer plugin, and uses the setSampleRate method to set its sampling rate to the input argument Fs. HelperBassEnhancerSim is a simple function that may be used to perform bass enhancement as part of a larger MATLAB simulation. This is particularly useful if the object is part of a streaming MATLAB simulation where the command window is not free. You can use configureMIDI to enable tuning the object using a MIDI device. 
You can also use audiopluginexample.BassEnhancer in MATLAB just as you would use any other MATLAB object. You can also open a timescope and a spectrumAnalyzer to view and compare the input and output signals in the time and frequency domains, respectively. You can tune the plugin parameters as the test bench is executing. The test bench provides a graphical user interface to help you test your audio plugin in MATLAB. You can open a test bench for audiopluginexample.BassEnhancer using Audio Test Bench. You can incorporate the object into a MATLAB simulation, or use it to generate an audio plugin using generateAudioPlugin. The plugin parameters are the upper cutoff frequency of the bandpass filter, and the gain applied at the output of the bandpass filter (G in the diagram above). Bass Enhancer Audio pluginĪudiopluginexample.BassEnhancer is an audio plugin object that implements the psychoacoustic bass enhancement algorithm. The left and right channels are concatenated into a single matrix and output.Īlthough the resulting output stereo signal does not contain low-frequency elements, the input's bass pitch is preserved thanks to the generated harmonics. y G is added to the left and right highpass channels.Ĩ. y B P, the bandpass filtered signal, passes through tunable gain, G.ħ. The filter's upper cutoff frequency may be adjusted to fine-tune output sound quality.Ħ. y is passed through a bandpass filter with lower cutoff frequency set to the speaker's cutoff frequency.
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