JPH0868877A - Pronunciation device - Google Patents

Abstract

PURPOSE: To realize a pronunciation device wherein sound pressure can be changed without any change of sound nature. CONSTITUTION: A audible sound production circuit 1 for producing an audible sound pulse S12 of an audible band, and a pulse production circuit 3 for sound pressure control for producing three pulses S31 , S32 , S33 for the sound pressure control having respective different pulse widths dividing the audible sound S 12 at a specified rate are provided. A sound pressure selection circuit 4 for successively selecting and outputting the three output pulses S31 , S32 , S33 of the pulse production circuit 3 at specified time intervals in response to the output of a timer circuit 5, and an output circuit 6 for inputting the output pulse S12 of the audible sound production circuit 1 and the output pulse S4 of the sound pressure selection circuit 4 and taking out and outputting a logical product are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sounding device for generating alarm sounds such as alarm clocks.

[0002]

2. Description of the Related Art For example, as an alarm clock, the sound pressure of the alarm sound is gradually increased in steps for a predetermined time, for example, every 7 to 8 seconds, in order to comfortably wake up when the alarm sound is generated. There is known a device equipped with a sounding device configured to carry out.

As shown in FIG. 3A, a conventional sounding device uses a pulse having a constant frequency in the audible band, for example, 2 kHz, and the above-mentioned change in sound pressure is as shown in FIG.
As shown in (c), it is performed by changing the duty ratio.

[0004]

However, in the above-described conventional sounding device, the sound pressure is changed by changing the duty ratio of a constant frequency, so that not only the sound pressure but also the sound quality is changed, which is satisfactory. There is a problem that a dull alarm sound cannot be obtained. In particular, with the diversification of alarm sounds, such as the use of bird calls,
The change in the sound quality described above is an important issue that also affects the product value and the like.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a sounding device capable of changing sound pressure without changing sound quality.

[0006]

In order to achieve the above object, the sounding device of the present invention comprises an audible sound generating circuit for generating audible sound pulses in the audible band, and the audible sound pulse divided at a predetermined ratio. A sound pressure control pulse generating circuit for generating a plurality of sound pressure control pulses having different pulse widths, and a plurality of output pulses of the sound pressure control pulse generating circuit are sequentially selected and output at predetermined time intervals. Output circuit for inputting a sound pressure selection circuit, an output pulse of the audible sound generation circuit and an output pulse of the sound pressure selection circuit, and selecting and outputting a period in which both pulses are active in an active region of the input pulse Have and.

[0007]

According to the sounding device of the present invention, the audible sound generating circuit generates the audible sound pulse in the audible sound band corresponding to the input frequency and outputs it to the output circuit. Further, in the sound pressure control pulse generation circuit, a plurality of sound pressure control pulses having different pulse widths, each of which is obtained by dividing the audible sound pulse at a predetermined ratio according to the input frequency, are generated and supplied to the sound pressure selection circuit. Is output. In the sound pressure selection circuit, a plurality of output pulses of the sound pressure control pulse generation circuit are selected at predetermined time intervals and sequentially output to the output circuit. Then, in the output circuit, between the output of the audible sound generation circuit and the output of the sound pressure selection circuit,
For example, the logical product is taken and output. As a result, alarm sounds having different sound pressures are sequentially output at predetermined time intervals.

[0008]

1 is a block diagram showing an embodiment of a sounding device for an alarm clock according to the present invention. Also, in FIG.
The output waveform of the principal part of the circuit of FIG. 1 is shown. In FIG. 1, 1 is an audible sound generation circuit, 2 is a pattern selection circuit, 3 is a sound pressure control pulse generation circuit, 4 is a sound pressure selection circuit, 5 is a timer circuit, and 6 is an output circuit.

The audible sound generating circuit 1 is composed of a frequency memory 11 and an oscillator 12. Frequency memory 1
1 stores a plurality of types of audible alarm sounds, for example, frequencies corresponding to a bird's bark "Pyo" and the like, and receives an input signal φ of a predetermined frequency (for example, 260 kHz) and notifies the pattern selection circuit 2 of that fact. , The frequency corresponding to the pattern selected based on this is given to the oscillator 12.
The oscillator 12 outputs an audible sound pulse S ₁₂ of the frequency given by the frequency memory 11, for example, as shown in FIG.

The sound pressure control pulse generating circuit 3 receives an input signal φ having a predetermined frequency similar to the input signal φ to the audible sound generating circuit 1 described above, and outputs an audible sound pulse to a predetermined frequency in accordance with the input frequency, for example. For example, three pulses S ₃₁ , S ₃₂ , and S ₃₃ for controlling sound pressure as shown in FIG. 2 are generated and output to the sound pressure selecting circuit 4, each pulse having a different pulse width. These three sound pressure control pulses S _31, S
The frequencies of _{32 and} S ₃₃ are set to frequencies higher than the frequency of audible sound.

The sound pressure selection circuit 4 outputs the output signal of the timer circuit 5.
No. S_FiveOutput from the sound pressure control pulse generation circuit 3
Three pulse signals S₃₁, S₃₂, S₃₃For a predetermined time
Select the signal S at intervals of 7.5 seconds, for example._Fourage
Output to the output circuit 6. Specifically, the timer circuit 5
Output signal S_FivePulse signal for the first 7.5 seconds from the input of
S₃₁Is selected and output, and the next 7.5 seconds (up to 15 seconds)
Between the pulse signal S₃₂Select and output the next 7.5 seconds
Pulse signal S during (up to 22.5 seconds) ₃₃Select
Output.

The timer circuit 5 receives a start signal S _{ALM at} the alarm set time and receives a predetermined time (for example, 3).
0 seconds), the signal S ₅ is output to the sound pressure selection circuit 4.

The output circuit 6 inputs the output pulse S ₁₂ of the oscillator 12 of the audible sound generation circuit 1 and the output pulse S ₄ of the sound pressure selection circuit 4, and takes the logical product of both pulses and outputs it as a signal S ₆ . That is, as shown in FIG. 2, the output circuit 6 sequentially outputs audible sound pulses S ₆₁ , S ₆₂ , and S ₆₃ corresponding to the output pulses of the sound pressure selection circuit 4.

Next, the operation of the above configuration will be described. In the alarm clock, at the alarm setting time, a signal φ of, for example, 260 kHz generated by a control system (not shown) is input to the frequency memory 11 of the audible sound generation circuit 1 and the sound pressure control pulse generation circuit 3, and the activation signal S _ALM is generated.
Is input to the timer circuit 5. In the frequency memory 11,
Upon receiving the input signal φ, the pattern selection circuit 2 is notified of that fact. The pattern selection circuit 2 selects a sounding pattern according to the command of the frequency memory 11 and outputs it to the frequency memory. Then, the frequency corresponding to the pattern selected by the pattern selection circuit 2 from the frequency memory 11 is given to the oscillator 12. As a result, the audible sound pulse S ₁₂ as shown in FIG. 2 is generated from the oscillator 12 based on the frequency given by the frequency memory 11, and is output to the output circuit 6.

Further, in the sound pressure control pulse generating circuit 3,
Upon receiving the input signal φ, the audible sound pulse is divided at a predetermined ratio according to the input frequency, and each has three pulses S ₃₁ and S ₃₂ for sound pressure control, each having a different pulse width, as shown in FIG. S ₃₃ is generated and output to the sound pressure selection circuit 4. Further, in the timer circuit 5, when the activation signal S _ALM is input, the signal S ₅ is output to the sound pressure selection circuit 4 for a predetermined time (for example, 30 seconds).

Three outputs of the sound pressure control pulse generation circuit 3
In the sound pressure selection circuit 4 that receives the pulse, the output of the timer circuit 5
Force signal S_FiveBased on the sound pressure control pulse generation circuit 3
Output three pulse signals S₃₁, S₃₂, S₃₃When
The signals S are sequentially selected at intervals of 7.5 seconds, for example.
_FourIs output to the output circuit 6. Ie the first
Pulse signal S for 7.5 seconds₃₁Is selected and the next 7.5 seconds
Pulse signal S during (up to 15 seconds)₃₂Is selected,
Pulse signal S for 7.5 seconds (up to 22.5 seconds) ₃₃But
It is selected and output, and then DC output for the next 7.5 seconds.
A signal of a predetermined level corresponding to the force is output.

The output circuit 6 takes the logical product of the output pulse S ₁₂ of the oscillator 12 of the audible sound generation circuit 1 and the selection output pulse S ₄ of the sound pressure selection circuit 4 and outputs it as a signal S ₆ . That is, as shown in FIG. 2, the output circuit 6 first logically ANDs the output pulse S ₁₂ of the oscillator ₁₂ and the output pulse S ₃₁ of the sound pressure selection circuit 4, and the result is shown in FIG. Such an audible sound pulse S ₆₁ is output for 7.5 seconds, the logical product of the pulse S ₁₂ and the pulse S ₃₂ is taken in the next 7.5 seconds, and the audible sound pulse S ₆₂ is output. For 5 seconds, the logical product of the pulse S ₁₂ and the pulse S ₃₃ is taken and the audible sound pulse S ₆₃ is output. Then, in the next 7.5 seconds, the output of the sound pressure selection circuit 4 becomes equal to the DC output, and the output circuit 6 also outputs a signal corresponding thereto.

In this way, the output circuit 6 outputs the signal S ₆ whose sound pressure gradually increases at a predetermined time interval. In this case, since the duty of the audible sound pulse is not changed, the sound quality is not changed.

As described above, according to this embodiment,
An audible sound generating circuit 1 for generating an audible sound pulse S ₁₂ in the audible band, and three pulses S ₃₁ and S _{32 for controlling} sound pressure, each of which has a different pulse width obtained by dividing the audible sound pulse S ₁₂ at a predetermined ratio. , S ₃₃ for generating the sound pressure control pulse, and three output pulses S ₃₁ , S ₃₂ , S ₃₃ of the sound pressure control pulse generating circuit 3 at predetermined time intervals according to the output of the timer circuit 5. type sequentially sound pressure selection circuit 4 selects and outputs the output pulse S ₄ of the output pulses S ₁₂ and sound pressure selection circuit 4 audible sound generating circuit 1, and outputs a logical product of both the pulse output circuit 6 is provided, it is possible to realize a sounding device capable of changing the sound pressure without changing the sound quality.

The number of pulses generated by the sound pressure control pulse generating circuit 3 and the pulse selection switching time of the sound pressure selecting circuit 4 are not limited to those in this embodiment, and various modes are possible. Needless to say.

[0021]

As described above, according to the present invention,
There is an advantage that a sounding device that can change the sound pressure without changing the sound quality can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a sounding device for an alarm clock according to the present invention.

FIG. 2 is a diagram showing an output waveform of a main part of FIG.

FIG. 3 is a waveform diagram for explaining a conventional sounding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Audible sound generation circuit 11 ... Frequency memory 12 ... Oscillator 2 ... Pattern selection circuit 3 ... Sound pressure control pulse generation circuit 4 ... Sound pressure selection circuit 5 ... Timer circuit 6 ... Output circuit

Claims (1)

[Claims] 1. An audible sound generating circuit for generating audible sound pulses in an audible band, and a sound for generating a plurality of pulses for sound pressure control, each of which is obtained by dividing the audible sound pulse at a predetermined ratio and has a different pulse width. A pressure control pulse generation circuit, a sound pressure selection circuit for sequentially selecting and outputting a plurality of output pulses of the sound pressure control pulse generation circuit at predetermined time intervals, an output pulse of the audible sound generation circuit and the sound An output circuit which receives an output pulse of a pressure selection circuit and selects and outputs a period in which both pulses are active in an active region of the input pulse.