JPS59146297A - Acoustic reproducing device - Google Patents

Abstract

PURPOSE:To convert directly a coding signal of plural bits into an acoustic signal by providing plural switching elements controlling current supply to each voice coil group or speaker group in response to the coding signal of each bit. CONSTITUTION:An output sound pressure corresponding to the weight of bits as P, P/2, P/4, P/8 (where P is sound pressure) is generated even if speakers 7-10 are driven by a DC power supply 6 of the same volage in the acoustic reproducing device for a 4-bit PCM signal. A signal from a PCM signal input terminal 16 is given to switching elements 11-14 as a gate signal from a switch driver circuit 15 by a signal of an address data input terminal 17, and a current flows to the speakers 7-10 from the switch driver circuit 15 to release sound. The PCM modulating signal of music and voice or the like is quantized by constant sampling times t1-tn to obtain the PCM signal. The output sound pressure is obtained by driving the speakers 7-10 at sampling times t1-tn by the switching elements 11-14 by means of the PCM signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sound reproduction device capable of generating sound directly from encoded signals.

Configuration of conventional example and its problems Figure 1 shows a conventional sound reproduction device (7) using a coded signal (PCM). In Figure 1, 1 indicates the input to which the encoded signal is applied. Terminal 2 is a digital-to-analog conversion converter (D/A converter) that converts the encoded signal into an analog signal, 3 is a low-frequency wave generator that removes unnecessary signals from the converted analog signal, 4 is a power amplifier, and the signal amplified by the power amplifier 4 is applied to the speakers and converted into sound t'L.

However, the conventional sound reproduction device described above has the following drawbacks.

(1) Since the D/A converter is expensive, the equipment is expensive4).

? ) If the PCM signal is converted to analog/cog once and the power is amplified, the power loss increases.Object of the InventionThe object of the present invention is to directly convert a multi-bit I1+:I signal into an acoustic signal. The object of the present invention is to provide a 74-tone reproducing device that can perform the following.

Accumulation of inventions (objectives listed above) 71. l! In order to achieve
A) Speaker! (T-mak is a speaker having a height corresponding to the weight of each bit. According to the source and the detention/signal of the valley bit, the above subikas t”a ?i
fv 1.1 This is characterized by comprising a plurality of switching elements for controlling current supply to each voice coil group.

DESCRIPTION OF EMBODIMENTS An embodiment VC of the present invention will now be described with reference to FIG. 2. This is a sound reproducing device for a 4-hit PCM signal.
Even if each speaker 7 to 10 is driven by the same voltage of the DC power supply 6, P, P/2
．． P/4. An output sound pressure equal to hc relative to the bit depth is generated, such as P/'8 (P: note 1-t). 11-14
16 is a switching element connected in series to the speakers 7 to 10, and 16 is a switch driver circuit, which receives a signal from the PCM signal input terminal 16 and a signal from the knee address data input terminal 1A, and outputs a signal from the switch driver circuit 15. A gate signal is applied to each of the switching elements 11-14, and a current is applied to the speakers 7-1o to emit or radiate sound according to the data.

Regarding the sound reproduction process of the device of the above embodiment, FIG.
This will be explained together with B and C.

The PCM modulated signal of music, voice, etc. shown in FIG. 3A is quantized by a constant sampling time t...tn,
The PCM signal shown in FIG. 3B is obtained. This PCMj;
M indicates the output sound pressure of the switching elements 11 to 14 in FIG. 2 (Ck shown in FIG. 3). It is a gift that is given to you.

FIG. 4 shows another embodiment of the present invention. In FIG. 4, a plurality of voice coils 19, 20, 21° 22 with different numbers of turns are wound around the same coil bobbin. The speaker is a speaker whose current supply to each voice coil 19-22 is controlled by switching elements 11-14, and which emits sound.

Effects of the Invention W- As described above, the present invention does not require the D and /A controllers, so it is cheaper and easier to operate.
Since there is no analog conversion, there is an advantage of low power loss.
It is something to do.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional rYu-based sound reproducing device, Fig. 2 is an electrical circuit diagram of a sound reproducing device according to an embodiment of the present invention, and Fig. 3 A-C show the operating costs of the same device. Figures 1 and 4 are electrical circuit diagrams of the song 1jV11VIII of the present invention. 61 drunk MF, power supply, 7~10 ・Speaker, 11~1
4...Switching element, 15...Switch driver circuit, 16 PCM signal input terminal, 17.Address data input terminal, 18...Speaker, 19-22
・・Bo Iscoil. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 cJBl Figure 4 f7

Claims (1)

[Claims] A sound reproducing device h that converts a coded signal of multiple bits into an audio signal, generates an output pressure signal corresponding to each bit of the car, and generates a loudspeaker group or a group of speakers for each bit. In the middle (7 to 1\), a speaker with a voice coil group, a DC power source that supplies all the current to the above voice coil group, and a voice coil signal U for each 1
, 6 and 1- The speaker group Oguhi supplies current to each voice coil group -\]! An acoustic C1 characterized by comprising a plurality of switches/elements to be controlled and 4.
Raw equipment.