JPH0648788B2 - Volume attenuator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound volume attenuating device that can be used in a radio receiver, a cassette deck, a television receiver, etc., to temporarily attenuate a predetermined volume.

2. Description of the Related Art Conventionally, there is known a device capable of temporarily reducing a sound volume by a predetermined amount. However, in these conventional volume attenuation devices, when the attenuation state is released, the volume suddenly increases to the level before attenuation.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, in the conventional volume attenuation device, when the volume attenuation state is released, the volume suddenly increases up to the level before the attenuation, which is psychologically surprising. .

The present invention solves the above-mentioned conventional problems, and provides a volume attenuating device that does not cause a psychological surprise to the listener without the volume suddenly increasing even when the volume attenuating state is released. It is a thing.

Means for Solving the Problems In order to achieve the above object, the present invention sends data for a predetermined amount of volume attenuation to a volume adjustment volume in the volume attenuation mode, and sends the volume adjustment volume to the volume adjustment volume in the volume attenuation release mode. A means for sending data for sequentially increasing the volume is provided.

Effects The present invention has the above-described configuration, and even if the sound volume attenuation mode is released, the sound volume does not suddenly increase and sequentially increases, so that psychological surprise is not given.

Embodiment FIG. 2 shows the front of an on-vehicle audio device (integrated device of a radio receiver and a cassette deck) according to an embodiment of the present invention. In FIG. 2, 1 is the main body of the apparatus, 2 is a power switch, 3 is a dust cover that is openably and closably provided in the cassette insertion opening, 4 is an eject button for ejecting the inserted cassette, and 5a, 5b, 5c are Each of them is a key switch, for example, the key switch 5b is for switching between displaying time and receiving frequency on a display section described later, and the key switch 5c displays an equalizer characteristic on a characteristic display section described later. It is for displaying and switching to the equalizer characteristic adjustment mode. Reference numeral 6 denotes a function display section 6 for displaying operable functions. On the front surface of the function display section 6, a plurality of key switches 7a to 7m made of transparent electrodes are arranged as shown in FIG. There is. 2 shows a display example in the radio mode, and FIG. 3 shows a display example in the cassette deck mode. Reference numeral 8 is a display section for displaying the reception frequency, time, traveling direction of the cassette deck, AM, FM, preset channel number, etc., and 9 is a characteristic display section for displaying the spectrum characteristic and the equalizer characteristic. A key switch 7n is arranged in the characteristic display section 9 as shown in FIG. 4, and by operating this key switch 7n, the display of the characteristic display section 9 is alternately switched between the spectral characteristic display and the equalizer characteristic display. To be Reference numeral 10 denotes a volume adjustment function display section for displaying a volume adjustment function. "VOL" blinks in the volume adjustment mode, "BAL" blinks in the left / right volume balance adjustment mode, and "FAD" blinks in the front / rear volume adjustment mode. To do. As shown in FIG. 4, the volume control function display section 10 has a mode switch key switch 7
o is arranged, and by operating the key switch 7o, the volume adjustment mode, the left / right volume balance adjustment mode, and the front / rear volume adjustment mode are sequentially switched. 1
Reference numeral 1 is a level attenuation display section, and this level attenuation display section 1
1, a key switch 7p is arranged as shown in FIG. 4, and the reproduction signal can be attenuated by 20 dB by operating the key switch 7p. 20 dB
When attenuating, "-20 dB" is displayed. 12
Is an up / down display section for displaying an increase or decrease in volume, and on this display section 12, key switches 7q and 7r are arranged as shown in FIG. The key switch 7q is for increasing the volume, and the key switch 7r is for decreasing the volume.

FIG. 1 shows the configuration of the above embodiment. In FIG. 1, 20 is an electronic tuner, 21 is a cassette deck, and 2
2 is an analog switch, and this analog switch 2
Reference numeral 2 is for selecting one of an acoustic signal output from the electronic tuner 20 and an acoustic signal output from the cassette deck 21, and a control signal output from the cassette deck 21 when a cassette is inserted into the cassette deck 21. As a result, the analog switch 22 is switched to the cassette deck 21 side, and the analog switch 22 is switched to the electronic tuner 20 side by a control signal generated when the cassette is ejected from the cassette deck 21. Reference numeral 23 denotes a bandpass filter group, and this bandpass filter group 2
3 has a center frequency of 63 Hz, 125 Hz, 250 Hz, 50
It is composed of band pass filters ₁ to _{7 of} 0 Hz, 1 KHz, 3.5 KHz and 10 KHz. The outputs of the bandpass filters ₁ to ₇ are used for displaying spectral characteristics. Reference numerals 24R and 24L denote bandpass filter groups that form equalizers for the right channel and the left channel, respectively, and these bandpass filter groups 24R and 24L.
Is composed of a plurality of band pass filters ₁ to ₇ each having a different center frequency. Reference numerals 25R and 25L are electronic volume groups that form equalizers for the right channel and the left channel, respectively. These electronic volume groups 25R and 25L are a plurality of electrons for adjusting the output levels of the bandpass groups 24R and 24L. Volume VR1 to V
Composed of R7. Reference numerals 26R and 26L are analog switches that form a defeat switch for the right channel and the left channel, respectively.
By switching R and 26L, it is possible to output an acoustic signal without going through an equalizer. 27F is an electronic volume for adjusting the levels of front (Front) signals FR, FL of the right and left channels, and 27R is an electronic volume for adjusting the levels of rear (RR) signals RR, RL of the right and left channels. It is a volume. 28F is the front signal FR,
Power amplifier for amplifying FL, 28R is rear signal RR, R
It is a power amplifier that amplifies L. Power amplifier 28F
The front signals FR and FL amplified by are the speakers 29FR and 29 arranged on the front right and left sides in the passenger compartment of the automobile, respectively.
The rear signals RR and RL which are applied to the FL and amplified by the power amplifier 28R are respectively applied to the speakers 29RR and 29RL arranged on the left and right of the rear side of the passenger compartment. Thirty
Is an operating unit, and the operating unit 30 is composed of the key switches 5a to 5c and 7a to 7r in FIG. Three
Reference numeral 1 denotes a display unit, and this display unit 31 includes the function display unit 6, the display unit 8, the characteristic display unit 9, the volume adjustment function display unit 10, the level attenuation display unit 11, and the up / down display unit 12 in FIG. Composed. A driver 32 drives the display unit 31.

Reference numeral 33 is the electronic tuner 20, cassette deck 21, electronic volume controls 25R and 25L, and analog switch 26.
A central processing unit (CPU) that controls the R, 26L, the electronic volumes 27F, 27R, and the driver 32, and the function of the CPU 33 will be described below. Reference numeral 34 denotes a key processing means. The key processing means 34 discriminates the key switch operated by the operation unit 30 to change or update the data stored in the storage means 35 and to the timing control means 36. Send the key discrimination result. The timing control means 36 determines the timing of various operations according to the key discrimination result, and controls the storage control means 37, the device selection control means 38, the display control means 39, and the deck control means 40. The storage control means 37 designates an address for writing data to or reading data from the storage means 35. The storage means 35 stores data for controlling the electronic tuner 20, data for controlling the cassette deck 21, and equalizer control (electronic volume 25R, 2).
5L, data for controlling analog switches 26R, 26L), data for controlling electronic volume 27F, 27R, and data for controlling driver 32 are stored. The data read from this storage means 35 is display control means, deck. It is transferred to the control means 40 and the serial interface 41. The device selection control means 38 is a device to which data is to be transferred from the CPU 33 (electronic tuner 20, equalizer electronic volume 25R, 25L, analog switch 26R, 26L, electronic volume 27F, 27).
R, driver 32) is designated. The data read from the storage means 35 is the serial interface 4
1, the electronic tuner 20 via the interface 42,
The data is transferred to the equalizers (electronic volume 25R, 25L), electronic volume 27F, 27R, and driver 32. Further, the data for controlling the cassette deck is transferred to the cassette deck 21 via the deck control means 40. 43
Is a timer for managing the time of the timing control means 36, 4
Reference numeral 4 denotes A / D conversion means for A / D converting the output of the bandpass filter group 23, and the data converted by the A / D conversion means 44 is passed through the display control means 39, the serial interface 41, and the interface 42. It is transferred to the driver 32.

Next, an outline of the operation of the above embodiment will be described.

Turn on the power switch 2 with the cassette not inserted.
If N, the radio mode is set and the display shown in FIG. 2 is displayed. In FIG. 2, when the portion displayed on the function display portion 6, for example, the “FM” display portion is pressed, the corresponding key switch (key switch 7a in FIG. 4) is turned on and the FM broadcast is received and displayed. “FM” is displayed in the section 8 and the reception frequency is displayed. The characteristic display unit 9 displays the level of each frequency band of the acoustic signal (spectral characteristic display). If the "TUNE" portion of the display is operated and the key switch 7d or 7 is pressed, the channel selection is performed.
When the key switch 7d or 7 is pressed for a short time, manual tuning is selected, and when it is pressed for a long time, automatic tuning is selected. Also, the display "1", "2", "3", "4",
When one of the key switches 7h to 7m corresponding to "5" and "6" is pressed, the preset station is received. In FIG. 2, when the volume adjusting function display unit 10 is pressed once, the volume adjusting mode is activated and "VOL" blinks. In this state, the key switch 7q or 7r of the up / down display section 12
When is pressed, new data is set in the electronic volumes 27F and 27R, and the volume is increased or decreased.

When the key switch 5c is pressed in the state shown in FIG. 2, the equalizer mode is set and the display is switched to that shown in FIG. In FIG. 5, for example, when the portion corresponding to the display "63" is pressed, the key switch 7a is turned on and the column corresponding to 63 Hz on the characteristic display portion 9 blinks. When the key switch 7q or 7r of the up / down display section 12 is pressed here, the level of 63 Hz of the equalizer is changed and the display of the characteristic display section 9 is also switched. Similarly, the levels of other frequency bands can be adjusted. After the adjustment, for example, when the display "1" portion is pressed for a long time (for example, 2 seconds or more), the adjusted equalizer characteristic is stored in the storage unit 35. When the display "1" portion is pressed for a short time, the stored data of the equalizer characteristic is read out, and this data is set in the electronic volumes 25R and 25L, and the characteristic display section 9 corresponds to the set equalizer characteristic. Display.

Next, a volume attenuation device (attenuator) which is a feature of the present invention
Will be described.

You may want to temporarily lower the volume while listening to a radio broadcast or while playing a cassette deck.
In this case, the level attenuation display section 11 is operated. When the level attenuation display section 11 is operated, the key switch 7p turns O
N When the key processing means 34 determines that the key switch 7p is pressed, the state of the attenuator stored in the storage means 35, that is, whether or not the attenuator is currently operating is checked, and the attenuator is not currently operating. If it is determined that the timing signal is output from the timing control means 36 in the attenuator mode. The storage control means 37 is operated by this timing signal, and the current electronic volume 37F stored in the storage means 35,
Data that is 20 dB lower than the set value of 37R is read, and this data is transferred to the electronic volumes 27F and 27R via the serial interface 41 and the interface 42. Therefore, the sound signal level is attenuated by 20 dB, and the sound volume is sharply reduced. Further, in this case, the data for switching the display of the display unit 31 is sent to the driver 32, "-20 dB" is displayed on the level attenuation display unit 11, and the step-like volume display displayed on the characteristic display unit 9 is set to 20 dB.
Switch to the reduced display. When canceling the attenuator, the level attenuation display section 11 is pressed again and the key switch 7p is turned on. When the key processing means 34 determines that the key switch 7p is operated, the state of the attenuator stored in the storage means 35 is checked. As a result, when it is determined that the attenuator is currently working, the timing control means 36 outputs a timing signal for canceling the attenuator. The storage control means 37 operates in response to this timing signal, reads the data stored in the storage means 35, which is increased by 2 dB from the current volume level, and transfers it to the electronic volumes 27F and 27R. The timer 43 measures the elapsed time after transferring the data, and
When 00 msec has passed, a signal is sent to the timing control means 36. When 100 msec has elapsed, data for further increasing the sound volume by 2 dB is read out from the storage means 35 and set in the electronic volume 27F, 27R. After that the volume is 20 dB
The above operation is repeated until the sound level is raised, and when the sound volume returns to the original level and one second elapses, the attenuator release mode ends. During this attenuator release mode, data is sequentially transferred to the driver 32 and the display of the characteristic display unit 9 is sequentially switched. When the attenuator release mode ends, the characteristic display unit 9 displays the spectrum characteristic or the equalizer characteristic. Note that FIG. 6 shows changes in the set levels of the electronic volumes 27F and 27R in the attenuator release mode.

As described above, according to the present embodiment, when the sound volume attenuation mode is released, the sound volume gradually increases, so that psychological surprise is not given.

EFFECTS OF THE INVENTION The present invention is configured as described above, and according to the present invention,
The sound volume can be attenuated rapidly, while the sound volume is gradually increased when the sound volume attenuation is released, so that the listener is not psychologically surprised.

[Brief description of drawings]

FIG. 1 is a block diagram of an audio device according to an embodiment of the present invention, FIGS. 2 and 3 are front views of the device, and FIG. 4 is a view showing arrangement of key switches of the device, and FIG. FIG. 6 is a front view of the same apparatus, and FIG. 6 is a diagram showing changes in the set level of the electronic volume of the same apparatus. 1 ... Device body, 2 ... Power switch, 3 ... Dust cover, 4 ... Eject button, 5a-5c ... Key switch, 6 ... Function display section, 7a-7r ... Key switch,
8 ... Display section, 9 ... Characteristic display section, 10 ... Volume adjustment function display section, 11 ... Level attenuation display section, 12 ... Up-down display section, 20 ... Electronic tuner, 21 ... Cassette deck, 22 ... Analog switch, 23 ... Bandpass filter group, 24L, 24R ... Bandpass filter group, 25L, 25R ... Electronic volume group, 26L,
26R: analog switch, 27F, 27R ... electronic volume, 28F, 28R ... power amplifier, 29F
R, 29FL, 29RR, 29RL ... Speaker, 30
...... Operation part, 31 …… Display part, 32 …… Driver, 3
3 ... Central processing unit, 34 ... Key processing means, 35 ...
Storage means, 36 ... Timing control means, 37 ... Storage control means, 38 ... Device selection control means, 39 ... Display control means, 40 ... Deck control means, 41 ... Serial interface, 42 ... Interface, 43
...... Timer, 44 ...... A / D conversion means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinobu Naito 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd. (72) Masami Shibao 4 Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa 3-3-1 Matsushita Communication Industrial Co., Ltd. (72) Inventor, Kazu Matsui 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd.

Claims (1)

[Claims] 1. An electronic volume for adjusting a sound signal level, a key switch for selecting a sound volume attenuation mode and a sound volume attenuation release mode, and one of the modes stored in a storage means when the key switch is operated, and the other is referred to. Key processing means for switching to the volume mode, and when the volume attenuation mode is switched by this key processing means, data for attenuating the acoustic signal level by a predetermined amount is sent to the electronic volume, and when the volume attenuation cancellation mode is switched. And a means for sending data for increasing the volume to the electronic volume in sequence.