JPH01238264A - Tone generator - Google Patents

Abstract

PURPOSE:To enable the sound volume of a generated tone to be changed step by step from it's generation time and to expand the form of utilization by varying attenuation volume data with a prescribed cycle. CONSTITUTION:Tone data from a tone data output circuit 210 is sent as the tone of prescribed sound volume through a tone attenuation volume processing circuit 220 and a D/A conversion part 230. In this case, the processing part 213 of the circuit 210 outputs the corresponding tone data by regarding a signal outputted by a tone control counter 211 as address input. By setting the dip switch 223 of the circuit 220, the corresponding attenuation volume data is successively outputted from a memory part 225 according to a value outputted by a counter 240. The tone data outputted by the circuit 210 and the attenuation volume data from the memory part 225 are computed by an arithmetic operation part 221 and the tone of the corresponding sound volume is sent.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a tone generation device that generates various tones sent from an exchange to a terminal, and aims to be able to change the volume of the generated tone in stages from the time of generation. tone data output means for outputting tone data; tone attenuation amount processing means for applying a predetermined amount of attenuation to the tone data by arithmetic processing of the output tone data and attenuation amount data; and converting this tone data into an analog signal. The tone generating device includes digital-to-analog converting means, and includes attenuation data variable means for varying attenuation data set in the tone attenuation processing means at a predetermined period.

(Industrial Application Field) The present invention relates to a tone generator that generates various tones (audible sounds) sent from an exchange to a terminal.In particular, the volume of the generated tone can be changed in stages from the time of generation. The present invention relates to a tone generator.

[Conventional technology]

The various tones (audible sounds) sent from the exchange to the terminal are
It is produced by a tone generator installed in the subscriber line signaling equipment (LSE) of the exchange.

FIG. 3 is a block diagram showing a conventional tone generator.

In the figure 1. The tone data output from the tone data output circuit 310 is input to the digital-to-analog converter 330 via the tone attenuation amount processing circuit 320 that provides a predetermined attenuation i (PAD value), and is converted into a tone (analog It is configured to be sent out as a signal).

The tone data output circuit 310 includes a tone control counter 3
Tone data corresponding to the output signal No. 11 is output from the tone data processing section 313.

The tone data processing unit 313 uses the output signal of the tone control counter 311 as an address input to sequentially read out corresponding codes from a read-only memory (ROM) in which the PCM codes of the sampled digital signals are stored in advance, and decodes them. By converting and arranging the necessary 1.
- A configuration for creating tone data, or storing data for 1/4 cycle of each necessary tone in ROM,
The remaining 3/4 cycle is created by reading this data in the opposite direction or reversing the sign.

The tone attenuation amount processing circuit 320 includes the tone attenuation amount calculation section 3
21, the attenuation amount data storage section (RO
M) 325 is operated with the attenuation i (PAD value) data read out from 325 to give a predetermined amount of attenuation to the tone data.

Note that this attenuation amount data is configured to be specified by the dip switch 323, but since the dip switch 323 is normally set once, it is fixed, so the generated tone has a constant volume.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tone generation device that can change the volume of a tone to be output in stages from the time of generation.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

In the figure, tone data output means 110 outputs predetermined tone data.

The tone attenuation amount processing means 120 applies a predetermined amount of attenuation to the tone data by arithmetic processing of the output tone data and attenuation amount data.

Digital-to-analog conversion means 130 converts this tone data into an analog signal.

The attenuation data variable means 140 varies the attenuation data set in the tone attenuation processing means 120 at a predetermined cycle.

[Function] According to the present invention, the attenuation amount data variable means 140 varies the attenuation amount data set in the tone attenuation amount processing means 120 at a predetermined period.
0, the amount of attenuation of the predetermined tone data output from the tone data output means 110 changes, and the digital
The volume of the tone output from the analog conversion means 130 can be changed stepwise from the time of its generation.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention.

In the figure, the tone data output from the tone data output circuit 210 is manually inputted to the digital-to-analog converter 230 via the tone attenuation amount processing circuit 220 that gives a predetermined attenuation ff1 (PAD value). Sent as a tone (analog signal). Its configuration is basically the same as the conventional configuration shown in FIG.

That is, the tone data output circuit 210 includes a tone control counter 211 and a tone data processing section 213, and the tone attenuation amount processing circuit 220 includes a tone attenuation amount calculation section 221, a dip switch 223, and an attenuation amount data storage section (ROM). )225.

The present invention is characterized by a counter 241 which outputs a count value according to the clock CLK and whose count value is cleared according to the external reset signal R3T as the attenuation amount data variable means in this embodiment. The output count value is taken into the attenuation amount data storage section 225, and the attenuation amount data is changed according to the count value.

Here, the dip switch 223 selects a mode in which one of the plurality of attenuation amount data is fixedly set as in the conventional case, and a mode in which the plurality of attenuation amount data are sequentially output according to the count value. Although an embodiment will be shown in which it is used as a means for specifying, it may also be used as a means for setting a range (or upper limit) of attenuation amount data that changes depending on the count value.

The table shows the relationship between Curran 1-values and attenuation data.

Table Below, the operation of the embodiment of the present invention will be explained with reference to FIG. 2 and the table.

Tone data processing section 21 of tone data output circuit 210
3 outputs corresponding tone data using the output signal of the tone control counter 211 as an address input.

Deep switch 22 of tone attenuation amount processing circuit 220
3, corresponding attenuation amount data is sequentially output from the attenuation amount data storage section 225 in accordance with the count value outputted from the counter 240.

The tone attenuation calculation unit 221 performs calculations on the tone data output from the tone data output circuit 210 and the attenuation data output from the attenuation data storage unit 225 and sends the data to the digital-to-analog conversion circuit 230. , the digital-to-analog conversion circuit 230 sends out a tone with a corresponding volume.

For example, when the count value is "0", the attenuation amount data is "ω", and a tone with a very small volume is transmitted.
Attenuation data increases by 30dB each time the count is increased.
The values become small, such as 15 dB, 8 dB, etc., and the volume of the transmitted tone becomes relatively large. When the count value reaches the predetermined value "F",
The counter 240 stops counting up, and thereafter a tone of -foot volume (attenuation amount data 0dd) is sent out.

Thereafter, when a tone transmission stop process is performed by an off-footer or the like of the terminal telephone to which the tone is transmitted, a reset signal R3T is transmitted to the counter 240 at that timing, and the counter 240 is cleared.

Note that, depending on the data settings of the attenuation amount data storage unit (ROM) 225, it is possible to easily adjust the volume in any pattern.

[Effects of the Invention] As described above, according to the present invention, it is possible to automatically control the tone volume, such as gradually increasing the tone volume, and the usage pattern is expanded compared to the conventional volume which was constant. It is extremely useful in practical terms.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the principle of the present invention, Figure 2 is a block diagram showing an embodiment of the present invention, and Figure 3 is a block diagram of the principle of the present invention.
The figure is a block diagram showing a conventional tone generator. In the figure, 110 is a tone data output means, 120 is a tone attenuation amount processing means, 130 is a digital-to-analog conversion means, 140 is an attenuation amount data variable means, 210 is a tone data output circuit, 211 is a tone control counter, and 213 is a tone 220 is a tone attenuation amount processing circuit, 221 is a tone attenuation amount calculation section, 223 is a dip switch, 225 is an attenuation amount data storage section, 230 is a digital-to-analog conversion circuit, and 240 is a counter. This method θ has a mean value of 0.771 sides.

Claims (1)

[Claims] (1) Tone data output means (110) for outputting predetermined tone data, and tone attenuation amount processing means (120) for giving a predetermined amount of attenuation to the tone data by arithmetic processing of the outputted tone data and attenuation amount data. ) and digital-to-analog conversion means (130) for converting the tone data into an analog signal, the attenuation amount data set in the tone attenuation amount processing means (120) is transmitted at a predetermined period. A tone generating device characterized by comprising attenuation data variable means (140) for varying attenuation amount data.