SU983746A1 - Timbre synthesis device - Google Patents

Description

The invention relates to radio engineering and may be used in the musical instrument, as well as amplification and recording devices for forming spe.ktra frequency from starting the harmonic oscillations FIR ⁵ to obtain certain colors audio tones.

A device for voice synthesis, comprising generators and invariant _{| 0} dividual formant filters £ 1].

The drawback of the device is a limited frequency band, beyond which the signal-to-noise ratio deteriorates, which does not allow for ₁₅ deep corrections of the tone.

The closest in technical essence to the invention is a device for synthesizing a tone, which secondly contains a series-connected pitch source, a balanced modulator, a band-pass filter, a demodulator and a formant filter, at 2

than a high-frequency generator is connected to the second input of the balanced modulator, and an additional generator is connected to the second input of the demodulator; 2]

A disadvantage of the known device is the low sound quality, due to the possibility of synthesizing a complex harmonic spectrum in it only for one frequency of the original sound oscillation, at all other frequencies the components of the spectrum will not be repeated for the base tone.

The purpose of the invention is to improve the sound quality.

This goal is achieved by the fact that in the device for the synthesis of timbre, containing the pitch source connected in series, (lance modulator, bandpass filter demodulator and formant filter, the high-frequency generator is connected to the second input of the balanced modulator, and

3 983746 4

modulator - an additional generator, the output of the source of the main tone is connected to the frequency-controlled input of the additional generator.

FIG. 1 is a block diagram of the device; in fig. 2 - spectral diagrams (a, b, c, d), explaining the synthesis of tone.

The device contains serially connected source 1 of the main tone, such as a microphone and amplifier, balanced modulator 2, band-pass filter 3 "demodulator 4 and formant filter 5. High-frequency generator 6 is connected to the second input of the balanced modulator 2, and additional generator 7" to the second input of the demodulator four.

The audio signal frequency ₄ (Fig.2A) is supplied from the source 1 of the main tone to the first input of the balanced modulator 2, and to its second input from the generator 6 a high frequency signal is output From the output of the balanced modulator 2 a modulated signal, in the spectrum of which there are side frequencies (1 / p + 51 ₄ th (Fig.26),

enters the input of the bandpass filter 3, which allocates one of the side frequencies: O / ₀ + & ₄ or (A / _s ~ 51 ₄ (Fig. 2c).

From the output of the band-pass filter 3, the signal arrives at the first input of ·, the demodulator 4, and the second input receives a frequency-modulated signal from an additional generator 7. This signal is formed as a result of modulation of the frequency of the generator 7 with a sound signal arriving at its control input from source 1 pitch. The output signal of the demodulator 4, depending on the modulation factor, instead of a single tone with a frequency d4 contains a spectrum of octave harmonics (Fig. 2d). Next, the low-frequency signal is fed to the input of the formant filter 5 to obtain a certain color musical

5 sounds.

In comparison with the known device in the proposed device, when the amplitude of the pitch signal decreases, the output signal has a more monotonous

A sound and, on the contrary, with an increase in its amplitude, a richer timbre sound, which improves the sound quality in general. In addition, a change in the modulation index of an additional generator makes it possible to control the timbre of the sound signal over a wide range.

Claims (1)

Claim A device for synthesizing timbre, containing successively connected pitch source, balanced modulator, band-pass filter, demodulator and formant filter, and a high-frequency generator 30 is connected to the second input of the balanced modulator, and an additional generator is connected to the second input of the demodulator. In order to improve sound quality, the output of the source of the fundamental tone _{35 is} connected to the frequency-controlled input of an additional generator.