JPS61163394A - Voice generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a sound generating device.

[Prior art and its problems]

Conventionally, various small electronic devices with a sound generation function have been put into practical use. That is, for example, a voice clock that notifies the time by voice,
An electronic clock with a recording function that digitally encodes the input voice, stores it in RAM (random access memory), records it, reads the recorded content from R, AM at the alarm time or any time, and plays it back. BACKGROUND ART Speech translators that generate translated language as voice, and small electronic computers with a voice generation function that generate input numerical data and calculation results as voice have been put into practical use.

However, in this type of small electronic device with a sound generation function, the sound output level is constant, and as a result, there is a problem that the sound cannot be heard due to surrounding noise. Therefore, it is possible to set the audio output level in advance by operating a switch, but this would make operating the switch cumbersome, and if the audio output level is set high even in a quiet environment, power consumption will increase and the battery life will be reduced. This causes the length to be shortened.

[Purpose of the invention]

The present invention was made against the background of the above-mentioned circumstances, and its purpose is to provide a sound generation device that can automatically adjust the sound output level according to surrounding noise.

[Key points of the invention]

In order to achieve the above-mentioned object, the gist of the present invention is to provide a detection means for detecting ambient sound, and to automatically adjust the audio output level according to the detection result of this detection means. .

[First Embodiment] Hereinafter, a first embodiment of the present invention will be specifically described based on FIG. 1. This embodiment is applied to an electronic timepiece with a recording function, and FIG. 1 is a circuit configuration diagram thereof. 1 in the diagram
is a clock circuit, which includes an oscillation circuit 2, a frequency division circuit 3, and a counting circuit 4, in which a basic clock signal constantly outputted from the oscillation circuit 2 is divided into a predetermined frequency signal (In2) by the frequency division circuit 3. It is counted by the counting circuit 4. This counting circuit 4
The timing data obtained is displayed on the display section 6 under the control of the control section 5.
is sent to and displayed. Further, a predetermined timing signal TP is outputted from the frequency dividing circuit 3 and sent to the control section 5, and the control section 5 controls various operations based on this timing signal TP. The control unit 5 receives a key operation signal corresponding to the operation key from the key operation unit 7, and in response to this key operation signal, performs an operation corresponding to the operation key. Here, the key operation section 7 includes a correction switch AM and a recording switch R.
Various push button switches such as Fi and a playback switch PL are provided.

The audio input section 8 is set to an operable state during recording and playback, and includes a microphone 9, an input amplifier 10, and a filter 11. The audio input from the microphone 9 is amplified by the input amplifier 10, and The high frequencies are removed and the signal is output from the audio input section 8. The audio waveform signal output from the audio human power section 8 is transferred to the input selector switch 12 and the output selector switch 1.
3 is input. During playback, the input selector switch 12 and the output selector switch 13 receive a switch control signal Cp of H1gh level (logical value "1") from the control unit 5 directly, and the output selector switch 13 receives a switch control signal Cp from the inverter 14. The input changeover switch 12 and the output changeover switch 13 are opened and output an audio waveform signal when the input switch control signal CP is at a high level. The audio waveform signal output from the input switch 12 is input to an A/D (analog/digital) conversion circuit 15, digitally encoded, and sent to a semiconductor memory 16. Note that the A/D conversion circuit 15 operates in accordance with an operation command MR output from the control section 5 during recording.

The semiconductor memory 16 is constituted by a large capacity (for example, 256 bits) RAM, and write and read operations are controlled under the control of the control unit 5.
The write and read addresses are designated according to address data sequentially sent from the address data. The audio data written in the semiconductor memory 16 is read out in the order in which it was written and sent to the D/A conversion circuit 17. This D/A conversion circuit 17 controls the control unit 5 during playback.
It operates in response to an operation command MP output from the semiconductor memory 16 and converts and synthesizes the audio data from the semiconductor memory 16 into an audio signal, and the audio signal thus converted is sent to the audio output section 18.

The audio output section 18 is set to an operable state in the playback mode, and includes a filter 19, an output amplifier 7'2Q,
Volume adjustment circuit 21. A speaker 22 is provided, and after high frequencies are removed by a filter 19, they are amplified to a predetermined size by an output amplifier 20.
The output from the speaker is further adjusted by a volume adjustment circuit 21, and then outputted as audio from a speaker 22.

In this case, the volume adjustment circuit 21 automatically adjusts the level of the output audio based on the signal output from the comparison circuit 23 in accordance with the surrounding noise.

The comparison circuit 23 compares the output of the reference voltage generation circuit 24 applied to one input terminal with the output of the filter 25 applied to the other input terminal, and the output of the 7-ilter 25 is applied to the reference voltage generation circuit 23. The level of surrounding noise is detected depending on whether the level is higher than the output level of , and a signal of a level corresponding to the detection result is outputted and supplied to the volume adjustment circuit 21.

Here, the filter 25 is connected to the output selector switch 13 during playback.
Comparison circuit 2 compares the signal sent from
3 as a comparison signal, and the output of the filter 25 is compared with a reference voltage for noise comparison. In addition, code B
T is a battery that supplies power supply voltage to each circuit.

Next, the operation of the recording function in the above embodiment will be explained. First, if you want to record audio such as schedule details, such as "meeting from 3:00 p.m.",
Turn on the recording switch RFi. Then, in response to a key operation signal from the key operation section 7, the control section 5 determines that the recording switch RFi has been operated, and accordingly sets the recording mode. In this recording mode, the audio input section 8 is set to an operable state, and the switch control signal OF output from the control section 5 becomes J, ow level (logical value "'0"), resulting in output switching. switch 13
is closed, while the input changeover switch 12 is opened, and furthermore, the A/D conversion circuit 15 is set to an operable state, and the semiconductor memory 16 is set to a recordable state in response to a write designation. In this state, when the voice to be recorded, such as the schedule content, is correctly pronounced into the microphone 9, the voice signal input from the microphone 9 is amplified by the input amplifier 10, and sent out from the voice input section 8 via the filter 11. be done. Here, in the recording mode, the input changeover switch 12 is opened as described above, so the audio signal sent from the audio input section 8 is inputted to the A/D conversion circuit 15 via the manual changeover switch 12. The data is digitally encoded and written into a designated address area of the semiconductor memory 16. Here, in the semiconductor memory 16, the designated address is sequentially updated by +1 in accordance with the address data from the control section 5, so that the audio data is sequentially written into the semiconductor memory 16 in the order in which the audio is input.

In this way, in the recording mode, desired contents can be arbitrarily recorded in the semiconductor memory 16.

In order to reproduce the contents recorded in the semiconductor memory 16 as described above, the reproduction switch PL is turned on. Then, in response to a key operation signal from the key operation section 7, the control section 5 sets the playback mode in response to the operation of the playback switch PL. In this playback mode, the audio input section 8 is set to the operating state, and the switch control signal OF output from the control section 5 becomes High level. As a result, the output changeover switch 13 is opened while the input The changeover switch 12 is closed, and the semiconductor memory 1
6 is set to a reproducible state upon receiving the reading designation, and the D/A conversion circuit 17 and audio output unit 18 are each set to an operable state.

In this way, the audio input unit 8 is in the operating state even in the playback mode, so when reproducing and outputting audio, the surrounding noise coming in from the microphone 9 passes through the input amplifier 10 and the filter 11 to the audio input unit 8. Sent from In this case, since the output changeover switch 13 is open in the reproduction mode, the noise signal sent from the audio input section 8 is supplied to the filter 25 via the output changeover switch 13. As a result, the output from the filter 25 and the output from the reference voltage generation circuit 24 are compared. Now, when the surrounding noise is large, the comparator circuit 23 outputs a logical value "l".
When the surrounding noise is relatively small, the comparator circuit 23 outputs a signal with a logical value of "O". That is, the comparison circuit 23 outputs a noise detection signal according to the surrounding noise, and the sound fl? of the audio output section 18 is output. Jl
It is given to the adjustment section 21. In this state, audio data is read from the semiconductor memory 16 according to the read address, converted into an audio signal by the D/A conversion circuit 17, and supplied to the audio output section 18. Then, in the audio output section 18, the output from the D/A conversion circuit 17 is transmitted to the filter 19.
, the volume F1. through the output amplifier 20. '! It is applied to the adjustment circuit 21. Thereby, the volume adjustment circuit 21 automatically adjusts the volume of the output audio of the audio signal from the output amplifier 20 in accordance with the output of the comparison circuit 23 and sends it to the speaker 22. In this case, the volume adjustment circuit 21 increases the volume when the output power of the comparison circuit 23 is 1", and sends the output of the output amplifier 20 as it is to the speaker 22 when the output power is 6o". Therefore, when the surrounding noise is loud during playback, the playback output level increases and audio is output at a volume that can be heard even in the noise, but in a relatively quiet environment, the preset normal volume will be output as audio.

[Second Embodiment] FIG. 2 shows a second embodiment of the present invention, and is a circuit diagram of an electronic timepiece with a recording function, similar to the first embodiment. This embodiment increases the functions of the first embodiment, and the difference is that first, the automatic output level up function explained in the first embodiment is set to an active state or set to a non-active state. The configuration is the same as that of the first embodiment, except that a function selection switch ON10FF is provided to select whether the Components similar to those shown in FIG. Therefore, the output of the function selection switch 0N10FF is trigger 7 rip 7.
It is applied to the T input terminal of the 0-tube (T-FF) 26 and inverts its output state.

The ζ output of this T-FF 26 is input to the AND gate 27 as a gate control signal. A switch control signal aP is input from the control section 5 to the other input terminal of the AND gate 27, and this switch control signal Op is output when the AND gate 27 is opened. The input signal is directly input to the input selector switch 13, and input via the inverter 14 to the input selector switches 1 and 2. Further, the output of the volume setting switch VM is given to the control section 5, and a volume control signal is outputted from the control section 5 and inputted to the volume adjustment circuit 21 of the audio output section 18.

According to the second embodiment configured as described above, by operating the function selection switch QN10FF, the T-FF
If you set 26 to the reset state, AND gate 2
7 is opened, the high-level switch control signal cP output from the control section 5 during playback is sent out via the AND gate 27. As a result,
As explained in the first embodiment, since the noise during reproduction is applied to the filter 25 via the output selector switch 13, the volume adjustment circuit 21 adjusts the output of the comparison circuit 23 and adjusts the noise level to the surrounding noise. Automatically adjust the output audio volume accordingly. Therefore, the automatic appearance level up function is set to the active state. In this state, if the function selection switch 0N10FF is replaced by one more, T-FF
Since the output state of 26 is inverted and becomes a set state, AND gate 27 is closed. Therefore, in this state, the automatic output level up function is set to be inactive. In addition, the volume setting switch V
Volume adjustment circuit 2 according to the output level preset in M.
1 is controlled, the volume can be increased or decreased by operating the volume setting switch VM according to the surrounding noise.

The encoding methods for audio recording include PCM (pulse food coding method), DM (delta modulation method), and A
DH (adaptive delta modulation method), DPOM (fi molecule:
A/X)-do method), ADPC! M (adaptive pulse code method), PARC! Any method such as an OR method may be adopted.

Furthermore, in the above embodiment, a 256-bit RAM is used for storing audio data, and in this 256-bit RAM, sampling at 8 KHz takes 32 seconds, and sampling at 4 KHz takes 32 seconds. 6
Although 4 seconds of recording is possible, a 1M bit RAM may be used to further increase the recording time. in this case,
If a 1 Mbit TLAM is sampled at 4 KHz, the recording time will be 4 minutes. Further, a plurality of RAMs may be provided, for example, 1Mbit RAM may be provided with 3
The recording time will be 12 minutes if you use two. And 4
Using M-bit RAM further increases the recording time.

Furthermore, although display was not particularly explained in the above embodiments, for example, the volume of noise or output audio may be displayed graphically,
It may be displayed digitally. In this case, by displaying the volume of the output audio along with the noise in a graph or the like, it is possible to check how much the output audio has increased relative to the surrounding noise.

In addition, the recording time, remaining time, recording capacity, and remaining capacity may be displayed graphically or digitally.

Moreover, although the above embodiment is applied to an electronic watch with a recording function, it can also be applied to a voice watch, a voice translator, a small electronic computer with a voice generation function, etc. as shown in the conventional example. Furthermore, recently there are devices that have a so-called data bank function, in which phone numbers, schedules, etc. are stored in advance and can be read out and displayed at will by operating a switch. It can also be used to output audio.

〔Effect of the invention〕

As explained in detail above, this invention provides a detection means for detecting ambient sound and automatically adjusts the audio output level according to the detection result of this detection means. Audio is output at the volume, so
There is no inconvenience of not being able to hear due to noise, and
When the surroundings are quiet, the sound is output at a low volume, which is advantageous in terms of power consumption.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an electronic timepiece with a recording function showing a first embodiment of the invention, and FIG. 2 is a circuit diagram of an electronic timepiece with a recording function showing a second embodiment of the invention. 8...Audio input section, 15...A/D conversion circuit, 16...Semiconductor memory, 17...
...D/A conversion circuit, 18...Audio output section, 2
1... Volume adjustment circuit, 23... Comparison circuit.

Claims (1)

[Claims] A small electronic device comprising a storage section for storing audio data, and an alarm section for reading out the audio data from the storage section and outputting audio, a detection means for detecting ambient sound, and a detection means for detecting ambient sound according to the detection result of the detection means. A sound generating device comprising: means for adjusting an output level from the sound alarm section.